CN115032773B - Fixed focus lens - Google Patents
Fixed focus lens Download PDFInfo
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- CN115032773B CN115032773B CN202210665321.8A CN202210665321A CN115032773B CN 115032773 B CN115032773 B CN 115032773B CN 202210665321 A CN202210665321 A CN 202210665321A CN 115032773 B CN115032773 B CN 115032773B
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- 230000003287 optical effect Effects 0.000 claims abstract description 25
- 239000011521 glass Substances 0.000 claims abstract description 18
- 239000006185 dispersion Substances 0.000 claims description 4
- 238000003384 imaging method Methods 0.000 abstract description 26
- 230000009977 dual effect Effects 0.000 abstract description 3
- 239000000463 material Substances 0.000 description 6
- 238000012544 monitoring process Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000004075 alteration Effects 0.000 description 3
- 239000006059 cover glass Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
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- 230000004048 modification Effects 0.000 description 1
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/06—Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/14—Optical objectives specially designed for the purposes specified below for use with infrared or ultraviolet radiation
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Abstract
The invention relates to a fixed focus lens, which sequentially comprises the following components along an optical axis from an object side to an image side: the lens comprises a first lens (L1) with negative focal power, a second lens (L2), a third lens (L3), a diaphragm (STO), a fourth lens (L4) with positive focal power, a fifth lens (L5) with negative focal power, a sixth lens (L6) with positive focal power and a plane protection glass (CG), wherein the second lens (L2) is a concave-convex lens, the third lens (L3) is a convex-convex lens, the fourth lens (L4) and the sixth lens (L6) are concave-convex lenses, the fifth lens (L5) is an aspheric lens, and the effective focal length F4 of the fourth lens (L4) and the effective focal length F of the fixed focal lens meet the following conditions: F4/F is less than or equal to 2.41 and less than or equal to 3.08. The lens can realize small volume, low cost, high pixel and wide view field, has better infrared band imaging quality, realizes day and night dual purposes, and does not have virtual focus in different temperature ranges of minus 40 ℃ to plus 80 ℃.
Description
Technical Field
The invention relates to the technical field of optical systems, in particular to a fixed-focus lens.
Background
In the market, fixed focus lenses occupy an important role in the field of security and protection monitoring industry. With the development of science, technology and social economy, the imaging requirements on the monitoring lens in production and living activities are increasingly higher for maintaining a safe and orderly social environment, and further improved requirements on the performance of the fixed focus lens are provided for meeting the requirements of night monitoring. The existing security lens adopts infrared band light filling to realize night monitoring, but due to the existence of chromatic aberration, the night monitoring quality of the lens can not guarantee clear imaging while the imaging quality of the lens monitored in daytime is guaranteed.
Disclosure of Invention
In order to solve the problems in the prior art, the invention aims to provide a fixed focus lens which has the advantages of small volume, low cost, high pixels, wide view field, good infrared band imaging quality, day and night dual purposes and no virtual focus in different temperature ranges of-40 ℃ to +80 ℃.
In order to achieve the above object, the present invention provides a fixed focus lens, comprising, in order from an object side to an image side along an optical axis: the lens comprises a first lens with negative focal power, a second lens with negative focal power, a third lens with positive focal power, a diaphragm, a fourth lens with positive focal power, a fifth lens with negative focal power, a sixth lens with positive focal power and a panel protecting glass.
According to one aspect of the invention, the optical axis is oriented in a direction from the object side to the image side,
the first lens is a paraxial region convex-concave lens or a paraxial region concave-concave lens;
the second lens is a concave-convex lens;
the third lens is a convex-concave lens;
the fourth lens and the sixth lens are convex-convex lenses;
the fifth lens is a concave lens.
According to one aspect of the present invention, the first lens, the second lens, the third lens, the fifth lens, and the sixth lens are all aspherical lenses;
the fourth lens is a spherical lens.
According to one aspect of the present invention, the first lens, the second lens, the third lens, the fifth lens and the sixth lens are all plastic lenses;
the fourth lens is a glass lens.
According to one aspect of the present invention, the total optical length TTL of the fixed focus lens and the effective focal length F of the fixed focus lens satisfy the following conditional expression: TTL/F is 6.66-7.45.
According to one aspect of the invention, the optical back Jiao Changdu BFL of the fixed focus lens and the effective focal length F of the fixed focus lens satisfy the following conditional expression: BFL/F is less than or equal to 1.96 and less than or equal to 2.06.
According to one aspect of the present invention, the effective focal length F1 of the first lens and the effective focal length F of the fixed focus lens satisfy the following conditional expression: -F1/F is less than or equal to 2.05 and less than or equal to-1.38.
According to one aspect of the present invention, the effective focal length F2 of the second lens and the effective focal length F of the fixed focus lens satisfy the following conditional expression: -61.04.ltoreq.F2/F.ltoreq.4.00.
According to one aspect of the present invention, the effective focal length F3 of the third lens and the effective focal length F of the fixed focus lens satisfy the following conditional expression: F3/F is more than or equal to 4.59 and less than or equal to 5.93.
According to one aspect of the present invention, the effective focal length F3 of the third lens and the effective focal length F4 of the fourth lens satisfy the conditional expression: F3/F4 is more than or equal to 1.46 and less than or equal to 2.48.
According to one aspect of the present invention, the thickness d3 of the third lens, the thickness d4 of the fourth lens, and the air space d34 between the third lens and the fourth lens satisfy the conditional expression: and d 3+d4)/d 34 is more than or equal to 0 and less than or equal to 17.26.
According to one aspect of the present invention, the effective focal length F4 of the fourth lens and the effective focal length F of the fixed focus lens satisfy the following conditional expression: F4/F is less than or equal to 2.41 and less than or equal to 3.08.
According to one aspect of the present invention, the fixed focus lens at least comprises a low-dispersion glass lens, and the abbe number Vd of the glass lens satisfies the following conditional expression: vd is more than or equal to 80 and less than or equal to 91.
According to one aspect of the present invention, the effective focal length F6 of the sixth lens and the effective focal length F of the fixed focus lens satisfy the following conditional expression: F6/F is less than or equal to 1.51 and less than or equal to 1.78.
According to the scheme of the invention, the optical architecture of the first lens to the sixth lens with the focal power of negative, positive, negative and positive is adopted, and parameters such as the focal power, shape, surface, material, focal length and the like of each lens are reasonably set and matched, so that the fixed focus lens realizes small volume (the total optical length TTL of the plate protection glass is less than or equal to 22.45 mm), low cost, high resolution power of 500 ten thousand pixels and wide view field, has better infrared band imaging quality, realizes day and night dual purposes, enables FNO to be less than or equal to 1.66, can stably and clearly image in different temperature ranges of minus 40 ℃ to +80 ℃, has no virtual focus, and can be suitable for different environments.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the embodiments will be briefly described below. It is apparent that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained from these drawings without inventive effort for a person of ordinary skill in the art.
Fig. 1a schematically illustrates a structure of a fixed focus lens according to a first embodiment of the present invention;
FIG. 1b is a schematic diagram of a Ray Fan of a fixed focus lens according to an embodiment of the present invention;
fig. 2a schematically illustrates a structure of a fixed focus lens according to a second embodiment of the invention;
fig. 2b schematically shows a Ray Fan diagram of a fixed focus lens according to a second embodiment of the present invention;
fig. 3a schematically illustrates a structure of a fixed focus lens according to a third embodiment of the present invention;
fig. 3b schematically shows a Ray Fan diagram of a fixed focus lens according to a third embodiment of the present invention;
fig. 4a schematically illustrates a structure of a fixed focus lens according to a fourth embodiment of the present invention;
fig. 4b schematically shows a Ray Fan diagram of a fixed focus lens according to a fourth embodiment of the present invention.
Detailed Description
The description of the embodiments of this specification should be taken in conjunction with the accompanying drawings, which are a complete description of the embodiments. In the drawings, the shape or thickness of the embodiments may be enlarged and indicated simply or conveniently. Furthermore, portions of the structures in the drawings will be described in terms of separate descriptions, and it should be noted that elements not shown or described in the drawings are in a form known to those of ordinary skill in the art.
Any references to directions and orientations in the description of the embodiments herein are for convenience only and should not be construed as limiting the scope of the invention in any way. The following description of the preferred embodiments will refer to combinations of features which may be present alone or in combination, and the invention is not particularly limited to the preferred embodiments. The scope of the invention is defined by the claims.
Referring to fig. 1a, an embodiment of the present invention provides a fixed focus lens, including, in order along an optical axis from an object side to an image side: a first lens L1 having negative power, a second lens L2 having negative power, a third lens L3 having positive power, a stop STO, a fourth lens L4 having positive power, a fifth lens L5 having negative power, a sixth lens L6 having positive power, and a flat cover glass CG. In the embodiment of the present invention, the shape of each lens is specifically: the object-side paraxial region of the first lens element L1 has a convex or concave shape and the image-side paraxial region thereof has a concave shape. The second lens L2 has a concave object-side surface and a convex image-side surface. The third lens L3 has a convex object-side surface and a concave image-side surface. The object-side and image-side surfaces of the fourth lens element L4 and the sixth lens element L6 are convex. The shape of the object side surface and the image side surface of the fifth lens element L5 is concave. That is, along the direction from the object side to the image side of the optical axis, the first lens L1 is a paraxial region convex-concave lens or a paraxial region concave-concave lens, the second lens L2 is a convex-concave lens, the third lens L3 is a convex-concave lens, the fourth lens L4 and the sixth lens L6 are both convex-convex lenses, and the fifth lens L5 is a concave-concave lens. Through reasonable collocation of positive and negative focal power and lens shape, miniaturization of the fixed focus lens, high resolution power of 500 ten thousand pixels, large aperture, dual-purpose day and night, FNO less than or equal to 1.66 and clear imaging in different temperature ranges of minus 40 ℃ to +80 ℃ are realized.
In the embodiment of the invention, the first lens L1, the second lens L2, the third lens L3, the fifth lens L5 and the sixth lens L6 are all aspheric lenses, and the fourth lens L4 is a spherical lens. In the embodiment of the invention, the first lens L1, the second lens L2, the third lens L3, the fifth lens L5 and the sixth lens L6 are all plastic lenses, and the fourth lens L4 is a glass lens. By adopting the combination of the plastic lens, the glass lens, the aspheric lens and the spherical lens, the image quality can be improved, and the high imaging performance of the fixed focus lens is ensured while the low cost is realized.
In the embodiment of the invention, the total optical length TTL of the fixed focus lens and the effective focal length F of the fixed focus lens meet the following conditional expression: TTL/F is 6.66-7.45. The optical back Jiao Changdu BFL of the fixed focus lens and the effective focal length F of the fixed focus lens meet the following conditions: BFL/F is less than or equal to 1.96 and less than or equal to 2.06. The optical back Jiao Changdu BFL refers to the last lens element of the fixed focus lens, i.e. the distance from the image side surface of the sixth lens element L6 to the image plane IMA in the embodiment of the present invention. By setting the parameters of the fixed-focus lens, the small volume of the lens can be realized. Specifically, the total optical length TTL of the fixed focus lens is less than or equal to 22.45mm (with the plate protecting glass CG).
In the embodiment of the invention, the effective focal length F1 of the first lens L1 and the effective focal length F of the fixed focus lens satisfy the following conditional expression: -F1/F is less than or equal to 2.05 and less than or equal to-1.38. The effective focal length F2 of the second lens L2 and the effective focal length F of the fixed focus lens satisfy the following conditional expression: -61.04.ltoreq.F2/F.ltoreq.4.00. Through carrying out reasonable setting and collocation to the focal length section of first lens L1 and second lens L2, can assemble incident light, realize the big angle of view of camera lens, control system light path further reduces the volume.
In the embodiment of the invention, the effective focal length F3 of the third lens L3 and the effective focal length F of the fixed focus lens satisfy the following conditional expression: F3/F is more than or equal to 4.59 and less than or equal to 5.93. The effective focal length F3 of the third lens L3 and the effective focal length F4 of the fourth lens L4 satisfy the following conditional expression: F3/F4 is more than or equal to 1.46 and less than or equal to 2.48. The thickness d3 of the third lens L3, the thickness d4 of the fourth lens L4, and the air space d34 between the third lens L3 and the fourth lens L4 satisfy the conditional expression: and d 3+d4)/d 34 is more than or equal to 0 and less than or equal to 17.26. In this way, by setting and reasonably collocating the focal length sections of the third lens L3 and the fourth lens L4, the thicknesses thereof and the air intervals, the aberration generated by the light passing through the stop STO can be reduced.
In the embodiment of the invention, the effective focal length F4 of the fourth lens L4 and the effective focal length F of the fixed focus lens satisfy the following conditional expression: F4/F is less than or equal to 2.41 and less than or equal to 3.08. In this way, the above design is performed on the focal length of the fourth lens L4, and in the embodiment of the present invention, the fixed focus lens at least includes one glass lens with low dispersion, and the abbe number Vd of the glass lens satisfies the following formula: vd is more than or equal to 80 and less than or equal to 91. The fixed focus lens comprises at least one glass lens with low dispersion property, can correct imaging chromatic aberration, control imaging purple fringing, realize clear imaging of infrared wave bands and realize day and night dual-purpose.
In the embodiment of the invention, the effective focal length F6 of the sixth lens L6 and the effective focal length F of the fixed focus lens satisfy the following conditional expression: F6/F is less than or equal to 1.51 and less than or equal to 1.78. Therefore, through reasonably setting and combining the focal length sections, the high and low temperature of the fixed focus lens imaging can be balanced, the temperature drift is avoided, the optical imaging performance is improved, the fixed focus lens can stably and clearly image in the temperature range of-40 ℃ to +80 ℃, and the fixed focus lens has high-quality imaging performance.
Thus, the optical framework of the fixed-focus lens comprises the first lens L1 to the sixth lens L6, the diaphragm STO and the plate protection glass CG, and the parameters such as focal power, shape, surface, material, focal length section, thickness, air interval and the like of each lens are reasonably set and matched, so that the fixed-focus lens realizes small volume, low cost, high resolution, wide view field, better infrared band imaging quality, day and night dual-purpose, stable and clear imaging in different temperature ranges of minus 40 ℃ to plus 80 ℃ and no virtual focus, has high resolution of 500 ten thousand pixels, and can be suitable for different environments.
The following describes the fixed focus lens of the present invention in detail with reference to the accompanying drawings and tables. In the following respective embodiments, the present invention refers to the stop STO as one side, the flat plate protection glass CG as two sides, and the image plane IMA 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 |
| 6.66≤TTL/F≤7.45 | 7.31 | 6.80 | 7.20 | 7.02 |
| 1.96≤BFL/F≤2.06 | 2.02 | 1.98 | 2.00 | 2.04 |
| -2.05≤F1/F≤-1.38 | -1.70 | -1.50 | -1.55 | -1.93 |
| -61.04≤F2/F≤-4.00 | -14.26 | -45.82 | -51.53 | -13.51 |
| 4.59≤F3/F≤5.93 | 5.50 | 5.70 | 5.46 | 4.81 |
| 1.46≤F3/F4≤2.48 | 2.24 | 2.31 | 2.23 | 1.63 |
| 0≤(d3+d4)/d34≤17.26 | 14.29 | 5.15 | 3.43 | 2.42 |
| 2.41≤F4/F≤3.08 | 2.45 | 2.47 | 2.45 | 2.95 |
| 80≤Vd≤91 | 88.19 | 82.19 | 80.19 | 90.19 |
| 1.51≤F6/F≤1.78 | 1.64 | 1.60 | 1.73 | 1.56 |
Table 1 in an embodiment of the present invention, the plastic aspherical lens of the fixed focus lens satisfies the following formula:
in the above formula, z is the axial distance from the curved surface to the vertex at the position with the height h perpendicular to the optical axis along the optical axis direction; c represents curvature at the apex of an aspherical surfaceA rate; k is a conic coefficient; a is that 4 、A 6 、A 8 、A 10 、A 12 、A 14 、A 16 The fourth order, sixth order, eighth order, tenth order, fourteenth order, sixteen order, respectively, are aspherical coefficients.
Example 1
Referring to fig. 1a, the parameters of the fixed focus lens of the present embodiment are as follows:
f# (FNO): 1.621; total optical length TTL:22.45mm; angle of view: 131.3 °; effective focal length: 3.07mm.
Table 2 lists relevant parameters of each lens in the fixed focus lens of this embodiment, including: surface type, radius of curvature (R value), thickness, refractive index of the material, and abbe number.
| Face number | Surface type | R value | Thickness d | Refractive index Nd | Abbe number Vd |
| S1 | Aspherical surface | 271.72 | 1.14 | 1.54 | 55.71 |
| S2 | Aspherical surface | 2.76 | 2.97 | ||
| S3 | Aspherical surface | -4.14 | 2.71 | 1.54 | 55.71 |
| S4 | Aspherical surface | -6.18 | 0.06 | ||
| S5 | Aspherical surface | 7.50 | 2.38 | 1.64 | 23.35 |
| S6 | Aspherical surface | 21.55 | 0.28 | ||
| S7(STO) | Spherical surface | Infinity | 0.13 | ||
| S8 | Spherical surface | 9.27 | 3.48 | 1.46 | 88.19 |
| S9 | Spherical surface | -4.84 | 0.08 | ||
| S10 | Aspherical surface | -25.35 | 0.72 | 1.64 | 23.53 |
| S11 | Aspherical surface | 4.38 | 0.06 | ||
| S12 | Aspherical surface | 4.79 | 2.24 | 1.54 | 55.98 |
| S13 | Aspherical surface | -5.19 | 0.50 | ||
| S14 | Spherical surface | Infinity | 0.80 | 1.52 | 64.20 |
| S15 | Spherical surface | Infinity | 4.9 | ||
| S16(IMA) | Spherical surface | Infinity | - |
TABLE 2
Table 3 lists the aspherical coefficients of each aspherical lens of the fixed focus lens of the present embodiment, including: the quadric constant K and the fourth-order aspheric coefficient A of the surface 4 Aspheric coefficient A of six orders 6 Eighth order aspheric coefficient A 8 Tenth order aspherical coefficient A 10 And twelve-order aspheric coefficient A 12 。
TABLE 3 Table 3
With reference to fig. 1a, fig. 1b and the foregoing tables 1 to 3, the fixed focus lens of the present embodiment achieves small volume, low cost, high resolution, wide field of view, good infrared band imaging quality, day and night dual-purpose, stable and clear imaging in different temperature ranges of-40 ℃ to +80 ℃ without virtual focus, high resolution of 500 ten thousand pixels, and adaptability to different environments. Fig. 1b shows the above-mentioned high imaging performance of the fixed-focus lens of the present embodiment.
Example two
Referring to fig. 2a, the parameters of the fixed focus lens of the present embodiment are as follows:
f# (FNO): 1.624; total optical length TTL:22.24mm; angle of view: 131.4 °; effective focal length: 3.27mm.
Table 4 lists relevant parameters of each lens in the fixed focus lens of this embodiment, including: surface type, radius of curvature (R value), thickness, refractive index of the material, and abbe number.
TABLE 4 Table 4
Table 5 lists the aspherical coefficients of each aspherical lens of the fixed focus lens of the present embodiment, including: the quadric constant K and the fourth-order aspheric coefficient A of the surface 4 Aspheric coefficient A of six orders 6 Eighth order aspheric coefficient A 8 Tenth order aspherical coefficient A 10 And twelve-order aspheric coefficient A 12 。
TABLE 5
With reference to fig. 2a and fig. 2b and the foregoing tables 1, 4 and 5, the fixed focus lens of this embodiment achieves a small volume, low cost, high resolution, wide field of view, good imaging quality in the infrared band, and dual-purpose day and night, and can stably and clearly image in different temperature ranges from-40 ℃ to +80 ℃ without virtual focus, has a high resolution of 500 ten thousand pixels, and is adaptable to different environments. Fig. 2b shows the above-mentioned high imaging performance of the fixed-focus lens of the present embodiment.
Example III
Referring to fig. 3a, the parameters of the fixed focus lens of the present embodiment are as follows:
f# (FNO): 1.65; total optical length TTL:22.26mm; angle of view: 132.8 °; effective focal length: 3.09mm.
Table 6 lists relevant parameters of each lens in the fixed focus lens of this embodiment, including: surface type, radius of curvature (R value), thickness, refractive index of the material, and abbe number.
TABLE 6
Table 7 lists the aspherical coefficients of each aspherical lens of the fixed focus lens of the present embodiment, including: the quadric constant K and the fourth-order aspheric coefficient A of the surface 4 Aspheric coefficient A of six orders 6 Eighth order aspheric coefficient A 8 Tenth order aspherical coefficient A 10 And twelve-order aspheric coefficient A 12 。
| Face number | K value | A 4 | A 6 | A 8 | A 10 | A 12 |
| S1 | 149.98 | 2.48E-04 | -1.30E-06 | -2.07E-07 | 2.94E-09 | 0.00E+00 |
| S2 | -0.58 | 1.52E-03 | 1.01E-03 | -7.12E-06 | -1.86E-05 | 3.77E-06 |
| S3 | 0.00 | 8.19E-04 | -1.23E-04 | 2.53E-05 | -2.51E-06 | 1.23E-08 |
| S4 | -4.91 | -4.83E-03 | 1.13E-04 | 3.14E-05 | -5.53E-06 | 2.66E-07 |
| S5 | -0.59 | -5.07E-05 | -3.64E-05 | 5.69E-05 | -5.06E-06 | 4.32E-07 |
| S6 | -25.52 | 2.28E-03 | -1.65E-04 | 4.71E-05 | -2.14E-06 | 5.37E-07 |
| S10 | 69.02 | -6.10E-03 | 1.11E-04 | -4.07E-05 | 5.84E-06 | -2.30E-07 |
| S11 | 0.60 | -5.47E-03 | -4.25E-04 | 7.42E-05 | -8.95E-06 | 4.17E-07 |
| S12 | -2.42 | 8.46E-04 | -6.18E-04 | 1.07E-04 | -1.07E-05 | 4.85E-07 |
| S13 | 0.77 | 5.16E-04 | -1.85E-04 | 5.03E-05 | -4.46E-06 | 2.06E-07 |
TABLE 7
With reference to fig. 3a, 3b and the above tables 1, 6 and 7, the fixed focus lens of this embodiment achieves small volume, low cost, high resolution, wide field of view, good infrared band imaging quality, day and night dual-purpose, stable and clear imaging in different temperature ranges of-40 ℃ to +80 ℃ without virtual focus, high resolution of 500 ten thousand pixels, and adaptability to different environments. Fig. 3b shows the above-mentioned high imaging performance of the fixed-focus lens of the present embodiment.
Example IV
Referring to fig. 4a, the parameters of the fixed focus lens of the present embodiment are as follows:
f# (FNO): 1.607; total optical length TTL:22.21mm; angle of view: 130.3 °; effective focal length: 3.17mm.
Table 8 lists relevant parameters of each lens in the fixed focus lens of this embodiment, including: surface type, radius of curvature (R value), thickness, refractive index of the material, and abbe number.
| Face number | Surface type | R value | Thickness d | Refractive index Nd | Abbe number Vd |
| S1 | Aspherical surface | 97.81 | 0.67 | 1.54 | 55.71 |
| S2 | Aspherical surface | 3.16 | 3.41 | ||
| S3 | Aspherical surface | -4.10 | 2.77 | 1.54 | 55.71 |
| S4 | Aspherical surface | -6.18 | 0.25 | ||
| S5 | Aspherical surface | 7.24 | 1.07 | 1.64 | 23.35 |
| S6 | Aspherical surface | 26.57 | 1.58 | ||
| S7(STO) | Spherical surface | Infinity | 0.00 | ||
| S8 | Spherical surface | 14.00 | 2.76 | 1.46 | 90.19 |
| S9 | Spherical surface | -5.79 | 0.05 | ||
| S10 | Aspherical surface | -27.62 | 0.64 | 1.64 | 23.53 |
| S11 | Aspherical surface | 4.39 | 0.05 | ||
| S12 | Aspherical surface | 4.60 | 2.50 | 1.54 | 55.98 |
| S13 | Aspherical surface | -5.08 | 0.50 | ||
| S14 | Spherical surface | Infinity | 0.80 | 1.52 | 64.2 |
| S15 | Spherical surface | Infinity | 5.16 | ||
| S16(IMA) | Spherical surface | Infinity | - |
TABLE 8
Table 9 lists the aspherical coefficients of each aspherical lens of the fixed focus lens of the present embodiment, including: the quadric constant K and the fourth-order aspheric coefficient A of the surface 4 Aspheric coefficient A of six orders 6 Eighth order aspheric coefficient A 8 Tenth order aspherical coefficient A 10 And twelve-order aspheric coefficient A 12 。
| Face number | K value | A 4 | A 6 | A 8 | A 10 | A 12 |
| S1 | 129.67 | 1.88E-04 | 2.15E-07 | 4.34E-08 | -6.19E-10 | 0.00E+00 |
| S2 | -1.09 | 4.08E-03 | -8.48E-05 | 7.07E-05 | -9.33E-06 | 6.14E-07 |
| S3 | -0.05 | 3.09E-04 | -8.95E-05 | -8.91E-06 | 4.73E-06 | -2.14E-07 |
| S4 | -4.47 | -4.94E-03 | 1.59E-04 | 4.46E-05 | -4.88E-06 | 2.06E-07 |
| S5 | -2.12 | -6.66E-04 | -4.64E-05 | 6.98E-05 | -3.30E-06 | 2.47E-07 |
| S6 | -49.75 | 2.04E-03 | -1.93E-04 | 4.78E-05 | -1.09E-06 | 5.98E-07 |
| S10 | -12.41 | -4.91E-03 | -2.47E-04 | 1.16E-04 | -1.54E-05 | 7.41E-07 |
| S11 | 0.41 | -7.10E-03 | -4.38E-04 | 1.98E-04 | -2.82E-05 | 1.36E-06 |
| S12 | -3.45 | 5.49E-04 | -4.59E-04 | 1.32E-04 | -1.62E-05 | 8.43E-07 |
| S13 | 0.62 | 9.28E-04 | -5.83E-05 | 5.15E-05 | -7.74E-06 | 5.40E-07 |
TABLE 9
With reference to fig. 4a, fig. 4b and the above tables 1, 8 and 9, the fixed focus lens of this embodiment achieves a small volume, low cost, high resolution, wide field of view, good imaging quality in the infrared band, day and night dual-purpose, stable and clear imaging in different temperature ranges from-40 ℃ to +80 ℃ without virtual focus, high resolution of 500 ten thousand pixels, and adaptability to different environments. Fig. 4b shows the above-mentioned high imaging performance of the fixed-focus lens of the present embodiment.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Claims (12)
1. A fixed focus lens, comprising, in order along an optical axis from an object side to an image side: the lens comprises a first lens (L1), a second lens (L2), a third lens (L3), a diaphragm (STO), a fourth lens (L4) with positive focal power, a fifth lens (L5) with negative focal power, a sixth lens (L6) with positive focal power and a plane protection glass (CG), wherein the second lens (L2) is a concave-convex lens, the third lens (L3) is a convex-concave lens, the fourth lens (L4) and the sixth lens (L6) are both convex-concave lenses, the fifth lens (L5) and the sixth lens (L6) are both aspheric lenses, and the lens is characterized in that the effective focal length F4 of the fourth lens (L4) and the effective focal length F of the fixed focal lens meet the condition formula: F4/F is more than or equal to 2.41 and less than or equal to 3.08;
the focal power of the second lens (L2) is negative, and the focal power of the third lens (L3) is positive;
an effective focal length F2 of the second lens (L2) and an effective focal length F of the fixed focus lens satisfy the following conditional expression: -61.04.ltoreq.F2/F.ltoreq.4.00.
2. The fixed focus lens of claim 1, wherein, in a direction from an object side to an image side along an optical axis,
the first lens (L1) is a paraxial region convex-concave lens or a paraxial region concave-concave lens.
3. The fixed focus lens according to claim 1, wherein the first lens (L1), the second lens (L2) and the third lens (L3) are all aspherical lenses;
the fourth lens (L4) is a spherical lens.
4. The fixed focus lens of claim 1, wherein the first lens (L1), the second lens (L2), the third lens (L3), the fifth lens (L5) and the sixth lens (L6) are all plastic lenses;
the fourth lens (L4) is a glass lens.
5. The fixed focus lens of any one of claims 1-4, wherein an optical total length TTL of the fixed focus lens and an effective focal length F of the fixed focus lens satisfy the conditional expression: TTL/F is 6.66-7.45.
6. The fixed focus lens of any one of claims 1-4, wherein an optical back Jiao Changdu BFL of the fixed focus lens and an effective focal length F of the fixed focus lens satisfy the conditional expression: BFL/F is less than or equal to 1.96 and less than or equal to 2.06.
7. The fixed focus lens according to any one of claims 1-4, wherein an effective focal length F1 of the first lens (L1) and an effective focal length F of the fixed focus lens satisfy the conditional expression: -F1/F is less than or equal to 2.05 and less than or equal to-1.38.
8. The fixed focus lens according to any one of claims 1-4, wherein an effective focal length F3 of the third lens (L3) and an effective focal length F of the fixed focus lens satisfy the conditional expression: F3/F is more than or equal to 4.59 and less than or equal to 5.93.
9. The fixed focus lens according to any one of claims 1-4, wherein an effective focal length F3 of the third lens (L3) and an effective focal length F4 of the fourth lens (L4) satisfy the conditional expression: F3/F4 is more than or equal to 1.46 and less than or equal to 2.48.
10. The fixed focus lens according to any one of claims 1-4, wherein a thickness d3 of the third lens (L3), a thickness d4 of the fourth lens (L4), and an air gap d34 between the third lens (L3) and the fourth lens (L4) satisfy the conditional expression: and d 3+d4)/d 34 is more than or equal to 0 and less than or equal to 17.26.
11. The fixed focus lens of any one of claims 1-4, wherein the fixed focus lens comprises at least one low dispersion glass lens, and the abbe number Vd of the glass lens satisfies the following formula: vd is more than or equal to 80 and less than or equal to 91.
12. The fixed focus lens according to any one of claims 1-4, wherein an effective focal length F6 of the sixth lens (L6) and an effective focal length F of the fixed focus lens satisfy the conditional expression: F6/F is less than or equal to 1.51 and less than or equal to 1.78.
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| TWI582483B (en) * | 2015-10-12 | 2017-05-11 | 今國光學工業股份有限公司 | Six-Piece Wide-Angle Lens Module |
| CN110426826B (en) * | 2019-08-12 | 2024-06-04 | 浙江舜宇光学有限公司 | Optical imaging system |
| CN114063261A (en) * | 2021-12-08 | 2022-02-18 | 舜宇光学(中山)有限公司 | Fixed focus lens |
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| CN110346917A (en) * | 2019-07-29 | 2019-10-18 | 舜宇光学(中山)有限公司 | Glass modeling mixing tight shot |
| CN213544925U (en) * | 2020-07-23 | 2021-06-25 | 天津欧菲光电有限公司 | Optical system, lens module and electronic equipment |
| CN112904539A (en) * | 2021-03-25 | 2021-06-04 | 舜宇光学(中山)有限公司 | Optical system |
| CN216351482U (en) * | 2021-11-10 | 2022-04-19 | 舜宇光学(中山)有限公司 | Fixed focus lens |
| CN217385968U (en) * | 2022-06-13 | 2022-09-06 | 舜宇光学(中山)有限公司 | Fixed focus lens |
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