CN215264207U - Fixed focus lens - Google Patents
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- CN215264207U CN215264207U CN202121667319.1U CN202121667319U CN215264207U CN 215264207 U CN215264207 U CN 215264207U CN 202121667319 U CN202121667319 U CN 202121667319U CN 215264207 U CN215264207 U CN 215264207U
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Abstract
The embodiment of the utility model discloses tight shot is disclosed. 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 embodiment of the utility model provides a tight shot to realize the effect of big light ring, big target surface, high pixel.
Description
Technical Field
The embodiment of the utility model provides a relate to optical imaging technical field, especially relate to a tight shot.
Background
Due to the advancement of technology and the development of 5G, various industries have put higher requirements on the performance of lenses in various aspects, such as resolution, high-temperature and 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.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model provides a fixed focus camera lens, this fixed focus camera lens do not need the light filling lamp under shimmer condition, can guarantee the effect of high-quality big image plane big light ring simultaneously.
The embodiment of the utility model provides a fixed focus camera lens, this fixed focus camera 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 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 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.
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
Wherein the content of the first and second substances,
the focal length of the fixed-focus lens is,
is the first lens power.
Optionally, the first lens power and the first lens thickness satisfy
Wherein the content of the first and second substances,
d1 is the first lens thickness for the first lens power;
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
Wherein the content of the first and second substances,
the focal length of the fixed-focus lens is,
is the second lens power.
Optionally, the refractive index Nd2 of the second lens satisfies 1.5 & lt Nd2 & lt 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:
wherein the content of the first and second substances,
is the power of the third lens and is,
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
Wherein D8 is the eighth lens thickness, D9 is the ninth lens thickness,
the focal length of the fixed-focus lens is shown.
The embodiment of the utility model provides a fixed focus camera lens is through setting up the first lens that has the negative focal power, the second lens that has the negative focal power, the third lens that has the positive focal power, the diaphragm, the fourth lens that has the positive focal power, the fifth lens that has the positive focal power, the sixth lens that has the negative focal power, the seventh lens that has the positive focal power, the eighth lens that has the positive focal power or has the negative focal power and the ninth lens that has the positive focal power or has the negative focal power that arranges in proper order along the optical axis from the object space to the image space; 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 provided in 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 provided in an embodiment of the present invention;
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 provided in an embodiment of the present invention;
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 accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of 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 diagram of a structure of a fixed-focus lens provided by an embodiment of the present invention, as shown in fig. 1, an embodiment of the present invention provides a fixed-focus lens including: 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 can 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, wherein the optical power is the reciprocal of the focal length.
In this 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, so that 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 present invention can be used with a day and night full-color camera, and has the characteristics of a large aperture (e.g., fno is less than or equal to 1.11), a large target surface, and high pixels, and can maximally match a 1/1.1 inch sensor chip, and can maximally satisfy 1200W pixels.
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 embodiment of the utility model provides a tight shot adopts the mode of glass lens, plastic lens combination, so sets up, can reduce cost, improve the performance, can satisfy-40 deg.C 80 ℃ of service condition, reduce cost when improving the camera lens performance promptly.
Optionally, the focal power of the first lens 11 and the focal power of the fixed-focus lens satisfy
Wherein the content of the first and second substances,
the focal length of the fixed-focus lens is,
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
Wherein the content of the first and second substances,
d1 is the first lens power, 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
Wherein the content of the first and second substances,
the focal length of the fixed-focus lens is,
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 1.5 & lt Nd2 & lt 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:
wherein the content of the first and second substances,
is the power of the third lens and is,
is the fourth lens power. So set up, can correct spherical aberration. Optionally, 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 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
Wherein D8 is the eighth lens thickness, D9 is the ninth lens thickness,
the focal length is the focal length of the fixed-focus lens.
The eighth lens element 18 and the ninth lens element 19 are plastic aspheric lens elements, and the eighth lens element 18 has a thickness D8, the ninth lens element 19 has a thickness D9, and the focal length of the fixed focus lens is adjusted to be constant
Satisfy the requirement of
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 embodiments 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 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:
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.
For example, 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, wherein "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 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:
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 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.
For example, fig. 11 is a schematic structural diagram of another fixed-focus lens provided in 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 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 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:
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 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 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.
It should be noted that the foregoing is only a preferred embodiment of the present invention and the technical principles applied. 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 with reference to the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the scope of the present invention.
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 lenses; the second lens is an aspheric lens.
2. The prime lens according to claim 1, wherein the object-side surface of the first lens element is convex and the image-side surface of the first lens element 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 or plastic non-spherical lens.
4. The prime lens according to claim 1, wherein the first lens power and the prime lens power satisfy
Wherein the content of the first and second substances,
the focal length of the fixed-focus lens is,
is the first lens power.
5. The prime lens according to claim 1, wherein the first lens power and the first lens thickness satisfy
Wherein the content of the first and second substances,
d1 is the first lens thickness for the first lens power;
and the first lens refractive index Nd1 satisfies Nd1> 1.7.
6. The prime lens according to claim 1, wherein the second lens power and the prime lens power satisfy
Wherein the content of the first and second substances,
the focal length of the fixed-focus lens is,
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. ltoreq. Nd 2. ltoreq.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:
wherein the content of the first and second substances,
is the power of the third lens and is,
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, whereinCharacterized in that the eighth lens thickness, the ninth lens thickness and the fixed-focus lens power satisfy
Wherein D8 is the eighth lens thickness, D9 is the ninth lens thickness,
the focal length of the fixed-focus lens is shown.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121667319.1U CN215264207U (en) | 2021-07-21 | 2021-07-21 | Fixed focus lens |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121667319.1U CN215264207U (en) | 2021-07-21 | 2021-07-21 | Fixed focus lens |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114779440A (en) * | 2022-04-29 | 2022-07-22 | 福建福光天瞳光学有限公司 | 8K ultrahigh-definition optical lens and imaging method thereof |
| CN114879350A (en) * | 2022-06-09 | 2022-08-09 | 舜宇光学(中山)有限公司 | Fixed focus lens |
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2021
- 2021-07-21 CN CN202121667319.1U patent/CN215264207U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114779440A (en) * | 2022-04-29 | 2022-07-22 | 福建福光天瞳光学有限公司 | 8K ultrahigh-definition optical lens and imaging method thereof |
| CN114779440B (en) * | 2022-04-29 | 2024-01-12 | 福建福光天瞳光学有限公司 | 8K ultra-high definition optical lens and imaging method thereof |
| CN114879350A (en) * | 2022-06-09 | 2022-08-09 | 舜宇光学(中山)有限公司 | Fixed focus lens |
| CN114879350B (en) * | 2022-06-09 | 2024-05-28 | 舜宇光学(中山)有限公司 | Fixed focus lens |
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