CN115685486A - Fixed focus lens - Google Patents

Fixed focus lens Download PDF

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Publication number
CN115685486A
CN115685486A CN202110825243.9A CN202110825243A CN115685486A CN 115685486 A CN115685486 A CN 115685486A CN 202110825243 A CN202110825243 A CN 202110825243A CN 115685486 A CN115685486 A CN 115685486A
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China
Prior art keywords
lens
power
fixed
convex
concave
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CN202110825243.9A
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Chinese (zh)
Inventor
李泽民
封文轩
张占军
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Dongguan Yutong Optical Technology Co Ltd
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Dongguan Yutong Optical Technology Co Ltd
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Priority to CN202110825243.9A priority Critical patent/CN115685486A/en
Priority to PCT/CN2022/105030 priority patent/WO2023001017A1/en
Publication of CN115685486A publication Critical patent/CN115685486A/en
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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
    • 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

Abstract

The embodiment of the invention discloses a fixed-focus lens. The fixed focus lens includes: a first lens having negative power, a second lens having negative power, a third lens having positive power, a diaphragm, a fourth lens having positive power, a fifth lens having positive power, a sixth lens having negative power, a seventh lens having positive power, an eighth lens having positive power or negative power, and a ninth lens having positive power or negative power, which are arranged in this order from the object side to the image side along the optical axis; the fifth lens, the sixth lens and the seventh lens are triple cemented lenses; the second lens is an aspheric lens. The fixed-focus lens provided by the embodiment of the invention realizes the effects of large aperture, large target surface and high pixels.

Description

Fixed focus lens
Technical Field
The embodiment of the invention relates to the technical field of optical imaging, in particular to a fixed-focus lens.
Background
Due to the advancement of science and technology and the development of 5G, various industries have put higher requirements on the performance of lenses in various aspects, such as resolution, high-low temperature confocal and low-light photographing. Generally, a camera can only obtain a high-pixel picture in a place with good lighting conditions, and an infrared fill light or other auxiliary light sources need to be added under the low-light condition, so that various light pollution can be caused, and the photographing effect is greatly lost.
Disclosure of Invention
The embodiment of the invention provides a fixed focus lens which does not need a light supplementing lamp under a low-light-level condition and can ensure the effect of a large image plane and a large aperture with high quality.
An embodiment of the present invention provides a fixed focus lens, including: a first lens having negative power, a second lens having negative power, a third lens having positive power, a diaphragm, a fourth lens having positive power, a fifth lens having positive power, a sixth lens having negative power, a seventh lens having positive power, an eighth lens having positive power or negative power, and a ninth lens having positive power or negative power, which are arranged in this order from the object side to the image side along the optical axis;
the fifth lens, the sixth lens and the seventh lens are cemented lenses; the second lens is an aspheric lens.
Optionally, the object-side surface of the first lens element is a convex surface, and the image-side surface of the first lens element is a concave surface; the object side surface of the second lens is a concave surface, and the image side surface of the second lens is a convex surface; the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a convex surface or a concave surface; the object side surface of the fourth lens is a convex surface or a concave surface, and the image side surface of the fourth lens is a concave surface or a convex surface; the object side surface of the fifth lens is a convex surface, and the image side surface of the fifth lens is a concave surface; the object side surface of the sixth lens is a concave surface, and the image side surface of the sixth lens is a concave surface; the object side surface of the seventh lens element is a convex surface, and the image side surface of the seventh lens element is a convex surface; the object side surface of the eighth lens is a convex surface or a concave surface, and the image side surface of the eighth lens is a convex surface or a concave surface; the ninth lens element has a convex or concave object-side surface and a convex or concave image-side surface.
Optionally, the first lens, the third lens, the fifth lens, the sixth lens and the seventh lens are all glass spherical lenses;
the second lens, the eighth lens and the ninth lens are all plastic aspheric lenses;
the fourth lens is a glass spherical or plastic non-spherical lens.
Optionally, the focal power of the first lens and the focal power of the fixed-focus lens satisfy
Figure BDA0003173530870000021
Wherein the content of the first and second substances,
Figure BDA0003173530870000022
the focal length of the fixed-focus lens is,
Figure BDA0003173530870000023
is the first lens power.
Optionally, the first lens power and the first lens thickness satisfy
Figure BDA0003173530870000024
Wherein the content of the first and second substances,
Figure BDA0003173530870000025
d1 is the first lens power, D1 is the first lens thickness;
and the first lens refractive index Nd1 satisfies Nd1>1.7.
Optionally, the focal power of the second lens and the focal power of the fixed-focus lens satisfy
Figure BDA0003173530870000026
Wherein, the first and the second end of the pipe are connected with each other,
Figure BDA0003173530870000027
the focal length of the fixed-focus lens is,
Figure BDA0003173530870000028
is the second lens power.
Optionally, the refractive index Nd2 of the second lens satisfies that Nd2 is greater than or equal to 1.5 and less than or equal to 1.7.
Optionally, the third lens is a glass spherical lens or a plastic aspheric lens, and the fourth lens is a glass spherical lens or a plastic aspheric lens;
and the third lens focal power and the fourth lens focal power satisfy:
Figure BDA0003173530870000029
wherein the content of the first and second substances,
Figure BDA0003173530870000031
is the power of the third lens and is,
Figure BDA0003173530870000032
is the fourth lens power.
Optionally, the abbe numbers of the fifth lens, the sixth lens and the seventh lens respectively satisfy: vd5-Vd6>20, vd7-Vd6>20;
wherein Vd5 is an abbe number of the fifth lens, vd6 is an abbe number of the sixth lens, and Vd7 is an abbe number of the seventh lens.
Optionally, the eighth lens thickness, the ninth lens thickness, and the focal length of the fixed-focus lens satisfy
Figure BDA0003173530870000033
Wherein D8 is the eighth lens thickness, D9 is the ninth lens thickness,
Figure BDA0003173530870000034
the focal length of the fixed-focus lens is shown.
The fixed focus lens provided by the embodiment of the invention is characterized in that 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 positive focal power, a sixth lens with negative focal power, a seventh lens with positive focal power, an eighth lens with positive focal power or negative focal power and a ninth lens with positive focal power or negative focal power are arranged in sequence from an object space to an image space along an optical axis; the second lens is an aspheric lens and can correct field curvature caused by a large image plane, and the fifth lens, the sixth lens and the seventh lens form a triple cemented lens group and can correct chromatic aberration caused by a large aperture, so that the prime lens with the large image plane and the large aperture is realized; meanwhile, the large-target-surface high-pixel array has large target-surface high pixels, can be matched with a 1/1.1 inch oversized target-surface sensor chip to the maximum extent, and can meet 1200W pixels to the maximum extent.
Drawings
Fig. 1 is a schematic structural diagram of a fixed focus lens according to an embodiment of the present invention;
fig. 2 is an axial aberration curve of the fixed focus lens shown in fig. 1;
FIG. 3 is a field curvature curve of the fixed focus lens shown in FIG. 1;
FIG. 4 is a distortion curve of the fixed focus lens shown in FIG. 1;
FIG. 5 is a chromatic aberration curve of the fixed-focus lens shown in FIG. 1;
fig. 6 is a schematic structural diagram of another fixed-focus lens according to an embodiment of the present disclosure;
fig. 7 is an axial aberration curve of the fixed focus lens shown in fig. 6;
FIG. 8 is a field curvature curve of the fixed focus lens shown in FIG. 6;
FIG. 9 is a distortion curve of the fixed focus lens shown in FIG. 6;
fig. 10 is a chromatic aberration curve of the fixed-focus lens shown in fig. 6;
fig. 11 is a schematic structural diagram of another fixed-focus lens according to an embodiment of the present disclosure;
fig. 12 is an axial aberration curve of the fixed focus lens shown in fig. 11;
FIG. 13 is a field curvature curve of the fixed focus lens shown in FIG. 11;
fig. 14 is a distortion curve of the fixed-focus lens shown in fig. 11;
fig. 15 is a chromatic aberration curve of the fixed-focus lens shown in fig. 11.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not to be construed as limiting the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Fig. 1 is a schematic structural diagram of a fixed focus lens according to an embodiment of the present invention, and as shown in fig. 1, the fixed focus lens according to the embodiment of the present invention includes: a first lens 11 having negative power, a second lens 12 having negative power, a third lens 13 having positive power, a diaphragm 20, a fourth lens 14 having positive power, a fifth lens 15 having positive power, a sixth lens 16 having negative power, a seventh lens 17 having positive power, an eighth lens 18 having positive power or negative power, and a ninth lens 19 having positive power or negative power, which are arranged in this order from the object side to the image side along the optical axis; the fifth lens 15, the sixth lens 16 and the seventh lens 17 are cemented triplet lenses; the second lens 12 is an aspherical lens.
Wherein, the focal power is equal to the difference between the convergence of the image side light beam and the convergence of the object side light beam, which characterizes the capability of the optical system to deflect the light. The larger the absolute value of the focal power is, the stronger the bending ability to the light ray is, and the smaller the absolute value of the focal power is, the weaker the bending ability to the light ray is. When the focal power is positive, the refraction of the light is convergent; when the focal power is negative, the refraction of the light is divergent. The optical power can be suitable for representing a certain refractive surface of a lens (namely, a surface of the lens), can be suitable for representing a certain lens, and can also be suitable for representing a system (namely a lens group) formed by a plurality of lenses together. In this embodiment, each lens may be fixed in a lens barrel (not shown in fig. 1), and the optical power of the lens is reasonably distributed, so that the optical lens has a good imaging effect, where the optical power is the reciprocal of the focal length.
In the embodiment, by reasonably distributing the power ratios of the first lens 11, the second lens 12, the third lens 13, the fourth lens 14, the fifth lens 15, the sixth lens 16, the seventh lens 17, the eighth lens 18 and the ninth lens 19, and by setting the second lens 12 to be an aspheric lens, curvature of field caused by a large image plane can be corrected, and the fifth lens 15, the sixth lens 16 and the seventh lens 17 form a three cemented lens group, chromatic aberration caused by a large aperture can be corrected, and the field angle can be increased, so that the fixed focus lens provided by the embodiment of the invention can be used with a day and night full-color camera, and has the characteristics of a large aperture (e.g. fno.ltoreq.1.11), a large target surface and high pixels, can be matched with a 1/1.1 inch sensor chip at most, and can satisfy 1200W pixels at most.
Further, by providing the stop 20 between the third lens 13 and the fourth lens 14, the imaging quality can be improved. It should be noted that, the present application does not specifically limit the position of the diaphragm, and a person skilled in the art may set the position of the diaphragm according to actual situations.
Meanwhile, the volume of the fixed-focus lens can be further reduced due to the fact that the third lens 15, the sixth lens 16 and the seventh lens 17 form the triple cemented lens group, and the miniaturization of the fixed-focus lens is achieved.
Optionally, with reference to fig. 1, the object-side surface of the first lens element 11 is a convex surface, and the image-side surface of the first lens element 11 is a concave surface; the object side surface of the second lens 12 is a concave surface, and the image side surface of the second lens 12 is a convex surface; the object side surface of the third lens 13 is convex, and the image side surface of the third lens 13 is convex or concave; the object side surface of the fourth lens element 14 is convex or concave, and the image side surface of the fourth lens element 14 is concave or convex; the object side surface of the fifth lens 15 is convex, and the image side surface of the fifth lens 15 is concave; the object side surface of the sixth lens element 16 is a concave surface, and the image side surface of the sixth lens element 16 is a concave surface; the object-side surface of the seventh lens element 17 is convex, and the image-side surface of the seventh lens element 17 is convex; the object-side surface of the eighth lens element 18 is convex or concave, and the image-side surface of the eighth lens element 18 is convex or concave; the ninth lens element 19 has a convex or concave object-side surface and a convex or concave image-side surface.
Optionally, the first lens 11, the third lens 13, the fifth lens 15, the sixth lens 16 and the seventh lens 17 are all glass spherical lenses; the second lens element 12, the eighth lens element 18 and the ninth lens element 19 are all plastic aspheric lens elements; the fourth lens element 14 is a glass spherical lens or a plastic aspherical lens.
The prime lens provided by the embodiment of the invention adopts a mode of combining the glass lens and the plastic lens, and the arrangement can reduce the cost and improve the performance, and can meet the use condition of-40-80 ℃, namely, the cost is reduced while the performance of the lens is improved.
Optionally, the focal power of the first lens 11 and the focal power of the fixed-focus lens satisfy
Figure BDA0003173530870000061
Wherein, the first and the second end of the pipe are connected with each other,
Figure BDA0003173530870000062
the focal power of the fixed-focus lens is,
Figure BDA0003173530870000063
is the first lens power. That is, the light incident aperture is compressed by the first lens 11 to reduce aberration.
Optionally, the power of the first lens 11 and the thickness of the first lens 11 satisfy
Figure BDA0003173530870000065
Wherein the content of the first and second substances,
Figure BDA0003173530870000064
is the first lens power, D1 is the first lens thickness; and the refractive index Nd1 of the first lens 11 satisfies Nd1>1.7. This has the advantage that the light entrance aperture can be further compressed, further reducing aberrations.
Optionally, the focal power of the second lens 12 and the focal power of the fixed-focus lens satisfy
Figure BDA0003173530870000073
Wherein the content of the first and second substances,
Figure BDA0003173530870000072
the focal power of the fixed-focus lens is,
Figure BDA0003173530870000071
is the second lens power. That is, curvature of field can be corrected by the second lens 12.
Optionally, the refractive index Nd2 of the second lens 12 satisfies that Nd2 is greater than or equal to 1.5 and less than or equal to 1.7. This has the advantage that curvature of field can be further corrected.
Optionally, the third lens 13 is a glass spherical lens or a plastic aspheric lens, and the fourth lens 14 is a glass spherical lens or a plastic aspheric lens; and the focal power of the third lens 13 and the focal power of the fourth lens 14 meet the following conditions:
Figure BDA0003173530870000074
wherein the content of the first and second substances,
Figure BDA0003173530870000075
is the power of the third lens and is,
Figure BDA0003173530870000076
is the fourth lens power. So set up, can correct spherical aberration. Alternatively, the refractive index Nd3 of the third lens 13 may be set larger than the refractive index Nd4 of the fourth lens 14 to further correct the spherical aberration.
Alternatively, the abbe numbers of the fifth lens 15, the sixth lens 16 and the seventh lens 17 respectively satisfy: vd5-Vd6>20, vd7-Vd6>20; wherein Vd5 is the abbe number of the fifth lens, vd6 is the abbe number of the sixth lens, and Vd7 is the abbe number of the seventh lens. Therefore, the chromatic aberration correction capability can be improved to a certain extent, and the imaging quality of the fixed-focus lens is further improved.
Optionally, the thickness of the eighth lens 18, the thickness of the ninth lens 19 and the focal power of the fixed-focus lens satisfy
Figure BDA0003173530870000077
Wherein D8 is the eighth lens thickness, D9 is the ninth lens thickness,
Figure BDA0003173530870000078
the focal length is the focal length of the fixed-focus lens.
The eighth lens 18 and the ninth lens 19 are plastic aspheric lenses, and the thickness D8 of the eighth lens 18, the thickness D9 of the ninth lens 19 and the focal power of the fixed focus lens are set
Figure BDA0003173530870000079
Satisfy the requirement of
Figure BDA00031735308700000710
The high and low temperature can be corrected, and the lens aperture can be increased in design.
The following further describes the fixed focus lens provided in the embodiment of the present invention with reference to specific examples, and it should be noted that the following examples do not limit the present application.
The following are exemplary: with continued reference to fig. 1, in this embodiment, the radius of curvature, center thickness (i.e., distance between center points of adjacent mirror surfaces), refractive index, and K value of each lens from the object side to the image side along the optical axis in the fixed-focus lens shown in fig. 1 satisfy the conditions listed in table 1:
table 1 shows a design value of the fixed-focus lens:
Surf radius of curvature (mm) Thickness (mm) Refractive index Value of K
S1 14.22 5.01 2.00
S2 8.17 5.40 0.12
S3 -7.27 4.33 1.64 -3.52
S4 -14.50 1.66 -11.13
S5 28.87 3.00 1.95
S6 -100.03 0.45
STO PL 1.54
S8 14766.71 3.00 1.52
S9 -22.88 0.07
S10 13.27 4.02 1.70
S11 -21.95 0.94 1.75
S12 9.11 8.45 1.50
S13 -28.69 0.10
S14 -20.58 2.00 1.66 -101.71
S15 -13.72 0.05 -8.70
S16 9.56 2.73 1.54 -14.44
S17 7.49 4.6 -7.27
S18 PL 0.80 1.52
S19 PL 1.25
The surface numbers in table 1 are numbered according to the surface order of the respective lenses, where "S1" represents the front surface of the first lens, "S2" represents the rear surface of the first lens, and so on; "STO" represents the stop of the lens; the curvature radius represents the bending degree of the lens surface, a positive value represents that the surface is bent to the image surface side, a negative value represents that the surface is bent to the object surface side, wherein 'PL' represents that the surface is a plane, and the curvature radius is infinite; the thickness represents the central axial distance from the current surface to the next surface, the refractive index represents the deflection capacity of the material between the current surface and the next surface to light rays, the blank space represents that the current position is air, and the refractive index is 1; the K value represents the magnitude of the best fitting conic coefficient for the aspheric surface.
The aspheric conic coefficients can be defined by the following aspheric equation, but are not limited to the following representation:
Figure BDA0003173530870000091
wherein Z is the axial rise of the aspheric surface in the Z direction; r is the height of the aspheric surface; c is the curvature of the fitting sphere, and the numerical value is the reciprocal of the curvature radius; k is a fitting cone coefficient; A-F are coefficients of 4 th, 6 th, 8 th, 10 th, 12 th and 14 th order terms of the aspheric polynomial.
Table 2 shows a design value of the aspherical surface coefficient in the fixed-focus lens:
A4 A6 A8 A10 A12 A14
S3 -5.40797E-04 2.00270E-05 -4.95875E-07 7.84382E-09 -5.33012E-11 0.00000E+00
S4 -1.82601E-04 9.87239E-06 -2.07542E-07 2.84138E-09 -1.57276E-11 0.00000E+00
S14 5.50674E-04 -8.90280E-06 4.61992E-08 1.73935E-10 -6.32110E-11 2.84448E-13
S15 4.38013E-04 -4.42015E-06 -1.97224E-07 8.63421E-11 2.51308E-11 -1.41158E-13
S16 -7.02572E-04 1.87462E-06 -9.15029E-08 -3.63303E-09 1.75534E-10 -1.08488E-12
S17 -6.44488E-04 8.91692E-06 -5.71557E-08 1.43485E-09 7.50325E-12 -5.36410E-14
fig. 2 is an axial aberration curve of the fixed-focus lens shown in fig. 1, fig. 3 is a field curve of the fixed-focus lens shown in fig. 1, fig. 4 is a distortion curve of the fixed-focus lens shown in fig. 1, and fig. 5 is a chromatic aberration curve of the fixed-focus lens shown in fig. 1. As can be seen from fig. 2, 3, 4 and 5, the fixed-focus lens provided by the present embodiment has small axial aberration, small field curvature, small distortion, small chromatic aberration, high resolution, and good imaging quality at the full working distance.
Exemplarily, fig. 6 is a schematic structural diagram of another fixed-focus lens provided in an embodiment of the present invention, as shown in fig. 6, in this embodiment, the curvature radius, the center thickness (i.e., the distance between the center points of the adjacent mirror surfaces), the refractive index, and the K value of each lens from the object side to the image side along the optical axis in the lens shown in fig. 6 satisfy the conditions listed in table 3:
table 3 shows still another design value of the fixed-focus lens:
Surf radius of curvature (mm) Thickness (mm) Refractive index Value of K
S1 14.20 5.29 2.00
S2 8.03 5.40
S3 -7.23 4.13 1.64 -3.85
S4 -15.69 1.49 -15.71
S5 29.22 3.00 1.95
S6 -123.08 0.45
STO PL 1.54
S8 -170.23 3.00 1.64 -100.00
S9 -21.83 0.07 -1.33
S10 13.43 3.93 1.70
S11 -23.14 0.94 1.85
S12 8.01 6.39 1.62
S13 -23.56 0.10
S14 -19.83 3.00 1.66 -44.96
S15 -17.52 0.05 -6.57
S16 11.75 3.14 1.54 -13.07
S17 9.84 4.34 -7.26
S18 PL 0.80 1.52
S19 PL 1.25
The surface numbers in table 3 are numbered according to the surface order of the respective lenses, where "S1" represents the front surface of the first lens, "S2" represents the rear surface of the first lens, and so on; "STO" represents a diaphragm of the lens; the curvature radius represents the bending degree of the lens surface, a positive value represents that the surface is bent to the image surface side, a negative value represents that the surface is bent to the object surface side, wherein 'PL' represents that the surface is a plane, and the curvature radius is infinite; the thickness represents the central axial distance from the current surface to the next surface, the refractive index represents the deflection capacity of the material between the current surface and the next surface to light rays, the blank space represents that the current position is air, and the refractive index is 1; the K value represents the magnitude of the best fitting conic coefficient for the aspheric surface.
The aspheric conic coefficients can be defined by the following aspheric equation, but are not limited to the following representation:
Figure BDA0003173530870000111
wherein Z is the axial rise of the aspheric surface in the Z direction; r is the height of the aspheric surface; c is the curvature of the fitting sphere, and the numerical value is the reciprocal of the curvature radius; k is a fitting cone coefficient; A-F are coefficients of 4 th, 6 th, 8 th, 10 th, 12 th and 14 th order terms of the aspheric polynomial.
Table 4 shows a design value of the aspheric coefficient in the fixed-focus lens:
A4 A6 A8 A10 A12 A14
S3 -5.00481E-04 2.12385E-05 -4.89365E-07 7.50339E-09 -5.40334E-11 0.00000E+00
S4 -1.11307E-04 1.09901E-05 -2.02722E-07 2.89741E-09 -1.87565E-11 0.00000E+00
S8 1.39834E-05 3.68068E-07 1.54330E-09 -6.62541E-11 3.36102E-12 0.00000E+00
S9 1.59520E-05 4.20321E-08 2.66276E-09 8.30723E-11 -3.71457E-13 0.00000E+00
S14 4.81170E-04 -9.55049E-06 6.79065E-08 3.59778E-10 -6.88488E-11 6.89079E-13
S15 3.91433E-04 -6.38302E-06 -2.21475E-07 6.75593E-10 4.83386E-11 -2.42974E-13
S16 -8.21711E-04 -3.52816E-07 -7.29460E-08 -2.60970E-09 1.86427E-10 -1.54397E-12
S17 -7.74776E-04 1.31524E-05 6.01485E-10 8.15424E-10 8.62122E-12 2.40001E-13
fig. 7 is an axial aberration curve of the fixed-focus lens shown in fig. 6, fig. 8 is a field curve of the fixed-focus lens shown in fig. 6, fig. 9 is a distortion curve of the fixed-focus lens shown in fig. 6, and fig. 10 is a chromatic aberration curve of the fixed-focus lens shown in fig. 6. As can be seen from fig. 7, 8, 9, and 10, the fixed focus lens provided in this embodiment has small axial aberration, small field curvature, small distortion, small chromatic aberration, high resolution, and good imaging quality at the full working distance.
Exemplarily, fig. 11 is a schematic structural diagram of another fixed focus lens provided by an embodiment of the present invention, as shown in fig. 11, in this embodiment, the curvature radius, the center thickness (i.e., the distance between the center points of the adjacent mirror surfaces), the refractive index, and the K value of each lens from the object side to the image side along the optical axis in the optical lens shown in fig. 11 satisfy the conditions listed in table 5:
table 5 shows a design value of the fixed-focus lens:
Surf radius of curvature (mm) Thickness (mm) Refractive index Value of K
S1 14.60 5.94 2.00
S2 7.98 5.40
S3 -7.79 4.14 1.64 -4.16
S4 -16.32 1.45 -16.91
S5 28.14 3.00 1.95
S6 -111.39 0.45
STO PL 1.54
S8 -45.74 3.00 1.64 -100.00
S9 -20.76 0.07 -9.04
S10 14.02 5.25 1.70
S11 -12.29 0.94 1.85
S12 7.34 4.10 1.62
S13 -36.74 0.10
S14 33.00 3.00 1.66 -24.71
S15 -29.08 0.05 8.36
S16 23.23 5.00 1.54 1.27
S17 10.01 3.00 -0.33
S18 PL 0.80 1.52
S19 PL 1.57
The surface numbers in table 5 are numbered according to the surface order of the respective lenses, where "S1" represents the front surface of the first lens, "S2" represents the back surface of the first lens, and so on; "STO" represents a diaphragm of the lens; the curvature radius represents the bending degree of the lens surface, a positive value represents that the surface is bent to the image surface side, a negative value represents that the surface is bent to the object surface side, wherein 'PL' represents that the surface is a plane, and the curvature radius is infinite; the thickness represents the central axial distance from the current surface to the next surface, the refractive index represents the deflection capability of the material between the current surface and the next surface to light, the blank space represents that the current position is air, and the refractive index is 1; the K value represents the magnitude of the best fitting conic coefficient for the aspheric surface.
The aspheric conic coefficients can be defined by the following aspheric equation, but are not limited to the following representation:
Figure BDA0003173530870000131
wherein Z is the axial rise of the aspheric surface in the Z direction; r is the height of the aspheric surface; c is the curvature of the fitting sphere, and the numerical value is the reciprocal of the curvature radius; k is the fitting cone coefficient; A-F are coefficients of 4 th, 6 th, 8 th, 10 th, 12 th and 14 th order of aspheric polynomial.
Table 6 shows a design value of the aspherical surface coefficient in the fixed-focus lens:
A4 A6 A8 A10 A12 A14
S3 -5.30555E-04 2.01159E-05 -4.91092E-07 8.68953E-09 -6.89591E-11 0.00000E+00
S4 -7.16557E-05 1.13725E-05 -1.97136E-07 2.66702E-09 1.56475E-12 0.00000E+00
S8 1.24022E-04 1.79952E-06 9.46488E-10 -3.70662E-10 1.49743E-11 0.00000E+00
S9 6.52120E-05 -3.47127E-07 1.40263E-08 3.39676E-10 4.62271E-12 0.00000E+00
S14 5.06858E-04 -1.03154E-05 6.14071E-08 5.46400E-10 -7.35402E-11 2.05302E-13
S15 1.72842E-04 -7.29999E-06 -1.65155E-07 1.98589E-09 5.26365E-11 -1.16269E-12
S16 -6.62192E-04 1.92590E-06 -7.82909E-08 -2.74654E-09 1.83175E-10 -1.54759E-12
S17 -4.41066E-04 1.45499E-05 -4.29123E-08 -2.50477E-09 1.55985E-10 -1.89024E-12
fig. 12 is an axial aberration curve of the fixed-focus lens shown in fig. 11, fig. 13 is a field curve of the fixed-focus lens shown in fig. 11, fig. 14 is a distortion curve of the fixed-focus lens shown in fig. 11, and fig. 15 is a chromatic aberration curve of the fixed-focus lens shown in fig. 11. As can be seen from fig. 12, 13, 14, and 15, the fixed focus lens provided in this embodiment has small axial aberration, small field curvature, small distortion, small chromatic aberration, high resolution, and good imaging quality at the full working distance.
It is to be noted that the foregoing description is only exemplary of the invention and that the principles of the technology may be employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims (10)

1. A prime lens, comprising: a first lens having negative power, a second lens having negative power, a third lens having positive power, a diaphragm, a fourth lens having positive power, a fifth lens having positive power, a sixth lens having negative power, a seventh lens having positive power, an eighth lens having positive power or negative power, and a ninth lens having positive power or negative power, which are arranged in this order from the object side to the image side along the optical axis;
the fifth lens, the sixth lens and the seventh lens are cemented triplet lenses; the second lens is an aspheric lens.
2. The prime lens according to claim 1, wherein the first lens object-side surface is convex and the first lens image-side surface is concave; the object side surface of the second lens is a concave surface, and the image side surface of the second lens is a convex surface; the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a convex surface or a concave surface; the object side surface of the fourth lens is a convex surface or a concave surface, and the image side surface of the fourth lens is a concave surface or a convex surface; the object side surface of the fifth lens is a convex surface, and the image side surface of the fifth lens is a concave surface; the object side surface of the sixth lens is a concave surface, and the image side surface of the sixth lens is a concave surface; the object side surface of the seventh lens is a convex surface, and the image side surface of the seventh lens is a convex surface; the object side surface of the eighth lens is a convex surface or a concave surface, and the image side surface of the eighth lens is a convex surface or a concave surface; the ninth lens element has a convex or concave object-side surface and a convex or concave image-side surface.
3. The prime lens according to claim 1, wherein the first lens, the third lens, the fifth lens, the sixth lens and the seventh lens are all glass spherical lenses;
the second lens, the eighth lens and the ninth lens are all plastic aspheric lenses;
the fourth lens is a glass spherical lens or a plastic aspheric lens.
4. The prime lens according to claim 1, wherein the first lens power and the prime lens power satisfy
Figure FDA0003173530860000011
Wherein, the first and the second end of the pipe are connected with each other,
Figure FDA0003173530860000021
the focal length of the fixed-focus lens is,
Figure FDA0003173530860000022
is the first lens power.
5. The prime lens according to claim 1, wherein the first lens power and the first lens thickness satisfy
Figure FDA0003173530860000023
Wherein the content of the first and second substances,
Figure FDA0003173530860000024
d1 is the first lens power, D1 is the first lens thickness;
and the first lens refractive index Nd1 satisfies Nd1>1.7.
6. The fixed focus lens according to claim 1, wherein the second lens power and the fixed focus lens power satisfy
Figure FDA0003173530860000025
Wherein the content of the first and second substances,
Figure FDA0003173530860000026
the focal length of the fixed-focus lens is,
Figure FDA0003173530860000027
is the second lens power.
7. The prime lens according to claim 1, wherein the refractive index Nd2 of the second lens satisfies 1.5 ≦ Nd2 ≦ 1.7.
8. The fixed-focus lens according to claim 1, wherein the third lens is a glass spherical lens or a plastic aspherical lens, and the fourth lens is a glass spherical lens or a plastic aspherical lens;
and the third lens focal power and the fourth lens focal power satisfy:
Figure FDA0003173530860000028
wherein the content of the first and second substances,
Figure FDA0003173530860000029
is the optical power of the third lens and is,
Figure FDA00031735308600000210
is the fourth lens power.
9. The prime lens according to claim 1, wherein the abbe numbers of the fifth lens, the sixth lens and the seventh lens respectively satisfy: vd5-Vd6>20, vd7-Vd6>20;
wherein Vd5 is an abbe number of the fifth lens, vd6 is an abbe number of the sixth lens, and Vd7 is an abbe number of the seventh lens.
10. The prime lens according to claim 3, wherein the eighth lens thickness, the ninth lens thickness, and the prime lens power satisfy
Figure FDA00031735308600000211
Wherein D8 is the eighth lens thickness, D9 is the ninth lens thickness,
Figure FDA00031735308600000212
the focal power of the fixed-focus lens is obtained.
CN202110825243.9A 2021-07-21 2021-07-21 Fixed focus lens Pending CN115685486A (en)

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CN117492185A (en) * 2023-12-29 2024-02-02 荣耀终端有限公司 Optical imaging lens, camera module and terminal equipment

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RU2413262C1 (en) * 2010-03-11 2011-02-27 Закрытое Акционерное Общество "Импульс" Projection large-aperture lens
CN110412752A (en) * 2019-09-06 2019-11-05 舜宇光学(中山)有限公司 Wide-angle lens
CN111123493A (en) * 2020-02-24 2020-05-08 东莞市宇瞳光学科技股份有限公司 Zoom lens
CN112130289A (en) * 2020-10-20 2020-12-25 东莞市宇瞳光学科技股份有限公司 Black light lens
CN112099205B (en) * 2020-11-16 2021-02-02 江西联创电子有限公司 Wide-angle lens
CN112666689A (en) * 2020-11-30 2021-04-16 中山联合光电科技股份有限公司 Zoom lens
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CN117492185A (en) * 2023-12-29 2024-02-02 荣耀终端有限公司 Optical imaging lens, camera module and terminal equipment

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