CN109839730B - Optical imaging lens - Google Patents
Optical imaging lens Download PDFInfo
- Publication number
- CN109839730B CN109839730B CN201910231571.9A CN201910231571A CN109839730B CN 109839730 B CN109839730 B CN 109839730B CN 201910231571 A CN201910231571 A CN 201910231571A CN 109839730 B CN109839730 B CN 109839730B
- Authority
- CN
- China
- Prior art keywords
- lens
- refractive index
- image side
- optical imaging
- object side
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Lenses (AREA)
Abstract
The invention relates to the technical field of lenses. The invention discloses an optical imaging lens, which sequentially comprises a first lens to a seventh lens from an object side to an image side along an optical axis, wherein the first lens is a convex-concave lens with negative refractive index; the second lens has negative refractive index, and the object side surface is concave; the third lens has positive refractive index, and the image side surface is convex; the fourth lens is a convex-concave lens with positive refractive index, the fifth lens has positive refractive index, and the image side surface is convex; the sixth lens has negative refractive index, and the object side surface is convex; the seventh lens has positive refractive power, the image side surface is a convex surface, and both the object side surface and the image side surface of the seventh lens are aspheric. The invention has the advantages of large main incidence angle, good optical imaging quality, small volume and light weight.
Description
Technical Field
The invention belongs to the technical field of lenses, and particularly relates to a seven-piece optical imaging lens.
Background
With the continuous progress of technology, in recent years, an optical imaging lens is also rapidly developed, and the optical imaging lens is widely applied to various fields such as smart phones, tablet personal computers, video conferences, security monitoring, unmanned aerial vehicles and the like. When the optical imaging lens is applied to the unmanned aerial vehicle, the volume and the weight of the optical imaging lens are expected to be smaller, so that the overall weight of the unmanned aerial vehicle is reduced, the cruising ability is improved, but the volume and the weight of the optical imaging lens applied to the unmanned aerial vehicle are larger, and the requirements cannot be met.
In addition, the cost of a sensor with a large CRA (main incidence angle) is lower, but the stable all-glass optical imaging lens which is difficult to find is unmatched due to the overlarge CRA; the existing large CAR lens has poor resolution; the chromatic aberration is larger, the chromatic aberration reduction degree is poor, the distortion is serious, and the increasingly-improved optical imaging performance requirement cannot be met.
Disclosure of Invention
The invention aims to provide an optical imaging lens with large main incidence angle, good optical imaging quality, small volume and light weight, which is used for solving the problems.
In order to achieve the above purpose, the invention adopts the following technical scheme: an optical imaging lens sequentially comprises a first lens, a second lens, a third lens, a fourth lens, a diaphragm, a fifth lens, a sixth lens and a seventh lens from an object side to an image side along an optical axis; the first lens element to the seventh lens element each comprise an object side surface facing the object side and allowing the imaging light to pass therethrough, and an image side surface facing the image side and allowing the imaging light to pass therethrough;
the first lens has negative refractive index, the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface;
the second lens has negative refractive index, and the object side surface of the second lens is a concave surface;
the third lens has positive refractive index, and the image side surface of the third lens is a convex surface;
the fourth lens has positive refractive index, the object side surface of the fourth lens is a convex surface, and the image side surface of the fourth lens is a concave surface;
the fifth lens has positive refractive index, and the image side surface of the fifth lens is a convex surface;
the sixth lens has negative refractive index, and the object side surface of the sixth lens is a concave surface;
the seventh lens has positive refractive index, the image side surface of the seventh lens is a convex surface, and the object side surface and the image side surface of the seventh lens are aspheric;
the optical imaging lens has only seven lenses with refractive index.
Further, the optical imaging lens also satisfies: -3< f1/f < -1, 15 < R1 < 25, 3< R2 < 8, wherein f1 is the focal length of the first lens, f is the focal length of the optical imaging lens, R1 is the radius of curvature of the object side of the first lens, and R2 is the radius of curvature of the image side of the first lens.
Further, the image side surface of the second lens element and the object side surface of the third lens element are bonded together, and the following requirements are satisfied: vd2 is less than or equal to 30, vd3 is more than or equal to 50, vd3-Vd2 is more than 25, wherein Vd2 is the dispersion coefficient of the second lens at d line, and Vd3 is the dispersion coefficient of the third lens at d line.
Further, the image side surface of the fifth lens element and the object side surface of the sixth lens element are bonded together, and the following requirements are met: vd5 is greater than or equal to 50, vd6 is less than or equal to 35, vd6-Vd5 is greater than 25, wherein Vd5 is the Abbe number of the fifth lens element at d-line, and Vd6 is the Abbe number of the sixth lens element at d-line.
Further, the object side surface and the image side surface of the fourth lens are aspheric, and the following conditions are satisfied: nd4 is more than or equal to 1.8, wherein Nd4 is the refractive index of the fourth lens at d line.
Further, the optical imaging lens also satisfies: 0< f7/f <5, wherein f7 is the focal length of the seventh lens, and f is the focal length of the optical imaging lens.
Further, the optical imaging lens also satisfies: t1 > 1.0,1.5< T23<4.0,1.5< T56<3.0, wherein T1 is the thickness of the first lens on the optical axis, T23 is the sum of the thicknesses of the second and third lenses on the optical axis, and T56 is the sum of the thicknesses of the fifth and sixth lenses on the optical axis.
Further, the optical imaging lens also satisfies: ALT <15, ALG <5, where ALG is the sum of the air gaps of the first lens to the seventh lens on the optical axis, ALT is the sum of the thicknesses of the seven lenses of the first lens to the seventh lens on the optical axis.
Further, the optical imaging lens also satisfies: ALT/ALG <4.2, wherein ALG is the sum of the air gaps of the first lens to the seventh lens on the optical axis, and ALT is the sum of the thicknesses of the seven lenses of the first lens to the seventh lens on the optical axis.
Furthermore, the fourth lens and the fifth lens are arranged next to each other, the lenses are directly supported, and the diaphragm is realized by adopting a soma shading sheet.
The beneficial technical effects of the invention are as follows:
the invention adopts seven lenses, and has the advantages of large main incidence angle (CRA is more than or equal to 33 degrees), good resolution (the optical transfer function can reach 250lp/mm,4K image quality), extremely small chromatic aberration (435 nm-656nm section, chromatic aberration less than 1 um), optical distortion less than 6 percent, small volume and light weight (weight less than 5 g) by arranging the refractive index and concave-convex curved surfaces of each lens.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a first embodiment of the present invention;
FIG. 2 is a graph of MTF of 0.435-0.656um according to the first embodiment of the invention;
FIG. 3 is a schematic diagram of curvature of field and distortion in accordance with a first embodiment of the present invention;
FIG. 4 is a vertical axis color difference chart of the first embodiment of the present invention;
FIG. 5 is a graph of defocus of 0.435-0.656um for a first embodiment of the present invention;
FIG. 6 is a schematic structural diagram of a second embodiment of the present invention;
FIG. 7 is a graph of MTF between 0.435 and 0.656um for example two;
FIG. 8 is a diagram illustrating curvature of field and distortion in accordance with a second embodiment of the present invention;
FIG. 9 is a vertical axis color difference chart of a second embodiment of the present invention;
FIG. 10 is a graph of defocus of 0.435-0.656um for example two of the present invention;
FIG. 11 is a schematic diagram of a third embodiment of the present invention;
FIG. 12 is a graph of MTF between 0.435 and 0.656um for example III of the present invention;
FIG. 13 is a diagram showing curvature of field and distortion in accordance with a third embodiment of the present invention;
FIG. 14 is a vertical axis color difference chart of a third embodiment of the present invention;
FIG. 15 is a graph of defocus of 0.435-0.656um for example three of the present invention;
fig. 16 is a table showing the values of the respective important parameters according to three embodiments of the present invention.
Detailed Description
For further illustration of the various embodiments, the invention is provided with the accompanying drawings. The accompanying drawings, which are incorporated in and constitute a part of this disclosure, illustrate embodiments and together with the description, serve to explain the principles of the embodiments. With reference to these matters, one of ordinary skill in the art will understand other possible embodiments and advantages of the present invention. The components in the figures are not drawn to scale and like reference numerals are generally used to designate like components.
The invention will now be further described with reference to the drawings and detailed description.
The term "a lens having a positive refractive index (or negative refractive index)" means that the paraxial refractive index of the lens calculated by Gaussian optics theory is positive (or negative). The term "object side (or image side) of a lens" is defined as the specific range of imaging light rays passing through the lens surface. The surface roughness determination of the lens can be performed by a determination method by a person of ordinary skill in the art, that is, by a sign of a radius of curvature (abbreviated as R value). The R value may be commonly used in optical design software, such as Zemax or CodeV. The R value is also commonly found in the lens data sheet (lens data sheet) of optical design software. When the R value is positive, the object side surface is judged to be convex; when the R value is negative, the object side surface is judged to be a concave surface. On the contrary, when the R value is positive, the image side surface is judged to be concave; when the R value is negative, the image side surface is determined to be convex.
The invention provides an optical imaging lens, which sequentially comprises a first lens, a second lens, a third lens, a fourth lens, a diaphragm, a fifth lens, a sixth lens and a seventh lens from an object side to an image side along an optical axis; the first lens element to the seventh lens element each comprise an object side surface facing the object side and allowing the imaging light to pass therethrough, and an image side surface facing the image side and allowing the imaging light to pass therethrough;
the first lens has negative refractive index, the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface;
the second lens has negative refractive index, and the object side surface of the second lens is a concave surface;
the third lens has positive refractive index, and the image side surface of the third lens is a convex surface;
the fourth lens has positive refractive index, the object side surface of the fourth lens is a convex surface, and the image side surface of the fourth lens is a concave surface;
the fifth lens has positive refractive index, and the image side surface of the fifth lens is a convex surface;
the sixth lens has negative refractive index, and the object side surface of the sixth lens is a concave surface;
the seventh lens has positive refractive index, the image side surface of the seventh lens is a convex surface, and the object side surface and the image side surface of the seventh lens are aspheric; the object side surface and the image side surface of the seventh lens adopt aspheric surfaces, so that the effect of large CRA (main incidence angle) is achieved, high resolution, low distortion and low chromatic aberration are achieved, the system performance is better improved, and the system length is shortened.
The optical imaging lens has the advantages of large main incidence angle, good resolution, extremely small chromatic aberration, small optical distortion, small volume and light weight by adopting seven lenses and arranging the refractive index and the concave-convex curved surface of each lens.
Preferably, the optical imaging lens further satisfies: -3< f1/f < -1, 15 < R1 < 25, 3< R2 < 8, wherein f1 is the focal length of the first lens, f is the focal length of the optical imaging lens, R1 is the radius of curvature of the object side of the first lens, and R2 is the radius of curvature of the image side of the first lens, thereby effectively reducing system distortion.
Preferably, the image side surface of the second lens element and the object side surface of the third lens element are bonded to each other, and the following requirements are satisfied: vd2 is less than or equal to 30, vd3 is more than or equal to 50, vd3-Vd2 is more than 25, wherein Vd2 is the dispersion coefficient of the second lens at d line, vd3 is the dispersion coefficient of the third lens at d line; and the combination of high-low dispersion materials effectively controls chromatic aberration, optimizes image quality and improves system performance.
Preferably, the image side surface of the fifth lens element and the object side surface of the sixth lens element are bonded to each other, and the following requirements are satisfied: vd5 is greater than or equal to 50, vd6 is less than or equal to 35, vd6-Vd5 is greater than 25, wherein Vd5 is the dispersion coefficient of the fifth lens at d-line, vd6 is the dispersion coefficient of the sixth lens at d-line; and the combination of high-low dispersion materials effectively controls chromatic aberration, optimizes image quality and improves system performance.
Preferably, the object side surface and the image side surface of the fourth lens are aspheric, and the following conditions are satisfied: nd4 is more than or equal to 1.8, wherein Nd4 is the refractive index of the fourth lens at d line, so that the system performance is better improved, the aberration is corrected, the system length of the optical imaging lens is shortened, and the weight is reduced.
Preferably, the optical imaging lens further satisfies: 0< f7/f <5, wherein f7 is the focal length of the seventh lens, f is the focal length of the optical imaging lens, and the high resolution, low distortion and low chromatic aberration are realized while the large CRA effect is further achieved, so that the system performance is better improved, and the system length of the optical imaging lens is shortened.
Preferably, the optical imaging lens further satisfies: t1 > 1.0,1.5< T23<4.0,1.5< T56<3.0, wherein T1 is the thickness of the first lens on the optical axis, T23 is the sum of the thicknesses of the second and third lenses on the optical axis, and T56 is the sum of the thicknesses of the fifth and sixth lenses on the optical axis; the system length of the optical imaging lens is further shortened, the processing and the manufacturing are easy, and the system configuration is optimized.
Preferably, the optical imaging lens further satisfies: ALT <15, ALG <5, wherein ALG is the sum of the air gaps of the first lens to the seventh lens on the optical axis, ALT is the sum of the thicknesses of the seven lenses of the first lens to the seventh lens on the optical axis; the system length of the optical imaging lens is further shortened, the processing and the manufacturing are easy, and the system configuration is optimized.
Preferably, the optical imaging lens further satisfies: ALT/ALG <4.2, wherein ALG is the sum of the air gaps of the first lens to the seventh lens on the optical axis, ALT is the sum of the thicknesses of the seven lenses of the first lens to the seventh lens on the optical axis; the system length of the optical imaging lens is further shortened, the processing and the manufacturing are easy, and the system configuration is optimized.
Preferably, the fourth lens and the fifth lens are arranged next to each other, the lenses are directly supported, and the diaphragm is realized by adopting a soma shading sheet; the aperture spacing tolerance is reduced, and the system tolerance is improved.
Preferably, the first lens to the seventh lens are made of glass materials, but not limited thereto, and in some embodiments, may be made of other materials such as plastic.
The optical imaging lens of the present invention will be described in detail with specific examples.
Implement one
As shown in fig. 1, an optical imaging lens includes, in order from an object side A1 to an image side A2 along an optical axis I, a first lens 1, a second lens 2, a third lens 3, a fourth lens 4, a stop 9, a fifth lens 5, a sixth lens 6, a seventh lens 7, a plate glass 8, and an imaging plane 100; the first lens element 1 to the seventh lens element 7 respectively comprise an object side surface facing the object side A1 and allowing the imaging light to pass therethrough and an image side surface facing the image side A2 and allowing the imaging light to pass therethrough;
the first lens element 1 has a negative refractive power, wherein an object-side surface 11 of the first lens element 1 is convex, and an image-side surface 12 of the first lens element 1 is concave;
the second lens element 2 has a negative refractive power, wherein an object-side surface 21 of the second lens element 2 is concave, and an image-side surface 22 of the second lens element 2 is convex;
the third lens element 3 has positive refractive power, wherein an object-side surface 31 of the third lens element 3 is concave, and an image-side surface 32 of the third lens element 3 is convex;
the fourth lens element 4 has a positive refractive power, wherein an object-side surface 41 of the fourth lens element 4 is convex, an image-side surface 42 of the fourth lens element 4 is concave, and both the object-side surface 41 and the image-side surface 42 of the fourth lens element 4 are aspheric;
the fifth lens element 5 has a positive refractive power, wherein an object-side surface 51 of the fifth lens element 5 is concave, and an image-side surface 52 of the fifth lens element 5 is convex;
the sixth lens element 6 with negative refractive power has a concave object-side surface 61 and a convex image-side surface 62;
the seventh lens element 7 has positive refractive power, wherein an object-side surface 71 of the seventh lens element 7 is concave, an image-side surface 72 of the seventh lens element 7 is convex, and both the object-side surface 71 and the image-side surface 72 of the seventh lens element 7 are aspheric.
In this embodiment, the second lens 2 and the third lens 3 are cemented lenses, and the fifth lens 5 and the sixth lens 6 are cemented lenses.
In this embodiment, the fourth lens 4 and the fifth lens 5 are disposed next to each other, the lens is directly supported, and the diaphragm 9 is implemented by a soma light shielding film.
The detailed optical data of this particular example are shown in Table 1-1.
Table 1-1 detailed optical data for example one
| Surface of the body | Radius of curvature | Thickness of (L) | Material of material | Refractive index | Coefficient of dispersion | Focal length | |
| - | Object plane | Plane surface | Infinity | ||||
| 11 | First lens | 15.74 | 1.48 | Glass | 1.49 | 70.4 | -9.3 |
| 12 | 3.42 | 3.07 | |||||
| 21 | Second lens | -5.19 | 0.78 | Glass | 1.81 | 25.5 | -6.8 |
| 22 | -82.25 | 0 | |||||
| 31 | Third lens | -82.25 | 1.47 | Glass | 1.76 | 52.3 | 8.0 |
| 32 | -5.69 | 0.07 | |||||
| 41 | Fourth lens | 3.40 | 2.92 | Glass | 1.83 | 37.3 | 5.4 |
| 42 | 8.24 | 0.11 | |||||
| 9 | Diaphragm | Plane surface | 0.10 | ||||
| 51 | Fifth lens | -21.86 | 1.46 | Glass | 1.61 | 58.6 | 2.5 |
| 52 | -1.50 | 0 | |||||
| 61 | Sixth lens | -1.50 | 0.50 | Glass | 1.70 | 30.1 | -2.4 |
| 62 | -15.85 | 0.10 | |||||
| 71 | Seventh lens | -7.02 | 0.93 | Glass | 1.77 | 49.5 | 14.1 |
| 72 | -4.53 | 0.50 | |||||
| 8 | Flat glass | Plane surface | 0.30 | Glass | 1.52 | 64.2 | - |
| - | Plane surface | 3.21 | |||||
| 100 | Imaging surface | - | - |
In this embodiment, the object-side surface 41 and the image-side surface 42 of the fourth lens element 4 and the object-side surface 71 and the image-side surface 72 of the seventh lens element 7 are defined according to the following aspheric curve formula:
wherein:
and z: the depth of the aspheric surface (the perpendicular distance between the point on the aspheric surface that is y from the optical axis and the tangent plane that is tangent to the vertex on the optical axis of the aspheric surface);
c: curvature of the aspherical apex (the vertex curvature);
k: cone coefficient (Constant);
radial distance (radial distance);
r n : normalized radius (normalizationradius (NRADIUS));
u：r/r n ；
a m : mth order Q con Coefficient (is the m) th Q con coefficient)；
Q m con : mth order Q con Polynomials (the m) th Q con polynomial)；
For detailed data of the parameters of each aspheric surface, please refer to the following table:
| surface of the body | 41 | 42 | 71 | 72 |
| K＝ | 0.12 | -42.97 | -71.72 | -13.47 |
| a 4 ＝ | 5.34E-04 | 0.015 | -0.016 | -0.01 |
| a 6 ＝ | -5.52E-05 | 8.46E-03 | 0.011 | 3.82E-3 |
| a 8 ＝ | 4.16E-05 | -0.017 | -2.32E-3 | 3.04E-5 |
| a 10 ＝ | -4.96E-06 | 0.016 | 2.4E-4 | -8.82E-5 |
| a 12 ＝ | -5.05E-07 | -5.62E-03 | -1.89E-7 | 1.09E-5 |
Referring to fig. 16, where T4 is the thickness of the fourth lens element 4 on the optical axis I, T7 is the thickness of the seventh lens element 7 on the optical axis I, G12 is the air gap between the first lens element 1 and the second lens element 2 on the optical axis I, and G34 is the air gap between the third lens element 3 and the fourth lens element 4 on the optical axis I; g67 is the air gap of the sixth lens 6 to the seventh lens 7 on the optical axis I, and gsto is the sum of the air gaps before and after the stop 9.
The MTF transfer function diagram of the 0.435-0.656um segment of this embodiment is shown in detail in fig. 2, the field curves and distortion diagrams are shown in detail in fig. 3 (a) and 3 (B), the vertical axis chromatic aberration diagram is shown in detail in fig. 4,0.435-0.656um segment defocus diagram is shown in detail in fig. 5.
In this embodiment, the focal length f=4.6 mm of the optical imaging lens; aperture value fno=2.8; the image plane size Φ=8mm; the distance ttl=17.0 mm from the first lens 1 to the imaging plane 100 on the optical axis I, and the main incident angle car=33° chromatic aberration is lca=0.47 um.
Example two
As shown in fig. 6, the surface type concave-convex and refractive index of each lens in this embodiment is substantially the same as that of the first embodiment, only the image side surface 22 of the second lens element 2 is concave, the object side surface of the third lens element 3 is convex, the object side surface 51 of the fifth lens element 5 is flat, the image side surface 62 of the sixth lens element 6 is concave, the object side surface 71 of the seventh lens element is convex, and the curvature radius, lens thickness, aspheric lens coefficient and optical parameters of the system focal length of each lens element are different.
The detailed optical data of this particular example are shown in Table 2-1.
Table 2-1 detailed optical data for example two
| Surface of the body | Radius of curvature | Thickness of (L) | Material of material | Refractive index | Coefficient of dispersion | Focal length | |
| - | Object plane | Plane surface | Infinity | ||||
| 11 | First lens | 21.50 | 2.60 | Glass | 1.55 | 63.3 | -8.9 |
| 12 | 3.83 | 2.86 | |||||
| 21 | Second lens | -6.78 | 1.66 | Glass | 1.81 | 25.5 | -7.6 |
| 22 | 98.79 | 0 | |||||
| 31 | Third lens | 98.79 | 1.73 | Glass | 1.76 | 52.3 | 8.7 |
| 32 | -7.08 | 0.08 | |||||
| 41 | Fourth lens | 3.78 | 3.77 | Glass | 1.83 | 37.3 | 6.7 |
| 42 | 6.30 | 0.08 | |||||
| 9 | Diaphragm | Plane surface | 0.12 | ||||
| 51 | Fifth lens | Plane surface | 1.18 | Glass | 1.61 | 58.6 | 2.7 |
| 52 | -1.72 | 0 | |||||
| 61 | Sixth lens | -1.72 | 0.50 | Glass | 1.70 | 30.1 | -2.2 |
| 62 | 22.25 | 0.10 | |||||
| 71 | Seventh lens | 56.34 | 1.36 | Glass | 1.77 | 49.5 | 6.7 |
| 72 | -5.66 | 0.50 | |||||
| 8 | Flat glass | Plane surface | 0.30 | Glass | 1.52 | 64.2 | - |
| - | Plane surface | 3.12 | |||||
| 100 | Imaging surface | - | - |
For detailed data of the parameters of each aspheric surface in this embodiment, please refer to the following table:
| surface of the body | 41 | 42 | 71 | 72 |
| K＝ | 0.09 | 10.22 | -200 | -20.9 |
| a 4 ＝ | 8.04E-05 | 4.2E-03 | 4.4E-03 | -9.2E-3 |
| a 6 ＝ | -4.0E-05 | -3.94E-03 | 2.0E-03 | 3.6E-3 |
| a 8 ＝ | 2.05E-05 | 8.2E-03 | -4.0E-4 | -4.8E-5 |
| a 10 ＝ | -3.16E-06 | -8.3E-03 | 9.7E-5 | 7.5E-5 |
| a 12 ＝ | 2.22E-07 | 3.4E-03 | -1.1E-5 | -3.5E-6 |
The numerical values of the respective conditional expressions of this embodiment are shown in fig. 16.
The MTF transfer function diagram of the 0.435-0.656um segment of this embodiment is shown in fig. 7, the field curves and distortion diagrams are shown in fig. 8 (a) and 8 (B), the vertical axis chromatic aberration diagram is shown in fig. 9,0.435-0.656um segment defocus diagram is shown in fig. 10.
In this embodiment, the focal length f=4.5 mm of the optical imaging lens; aperture value fno=2.8; the image plane size Φ=8mm; the distance ttl=20.0 mm from the first lens 1 to the imaging plane 100 on the optical axis I, and the main incident angle car=33.2° chromatic aberration is lca=0.7 um.
Example III
As shown in fig. 11, the surface type concave-convex and refractive index of each lens in this embodiment is substantially the same as that of the first embodiment, only the image side surface 22 of the second lens element 2 is concave, the object side surface of the third lens element 3 is convex, the object side surface 51 of the fifth lens element 5 is flat, the object side surface 71 of the seventh lens element is convex, and the curvature radius, lens thickness, aspherical coefficient of each lens element and optical parameters of the system focal length are different.
The detailed optical data of this particular example are shown in Table 3-1.
Table 3-1 detailed optical data for example three
| Surface of the body | Radius of curvature | Thickness of (L) | Material of material | Refractive index | Coefficient of dispersion | Focal length | |
| - | Object plane | Plane surface | Infinity | ||||
| 11 | First lens | 20.69 | 2.60 | Glass | 1.55 | 62.8 | -8.7 |
| 12 | 3.72 | 2.78 | |||||
| 21 | Second lens | -96.60 | 1.62 | Glass | 1.80 | 25.3 | -7.5 |
| 22 | 92.50 | 0 | |||||
| 31 | Third lens | 92.50 | 1.68 | Glass | 1.76 | 52.3 | 8.5 |
| 32 | -6.88 | 0.07 | |||||
| 41 | Fourth lens | 3.67 | 3.67 | Glass | 1.83 | 37.3 | 6.5 |
| 42 | 6.12 | 0 | |||||
| 9 | Diaphragm | Plane surface | 0.22 | ||||
| 51 | Fifth lens | Plane surface | 1.13 | Glass | 1.61 | 60.3 | 2.7 |
| 52 | -1.67 | 0 | |||||
| 61 | Sixth lens | -1.67 | 0.50 | Glass | 1.70 | 30.1 | -2.2 |
| 62 | -22.85 | 0.07 | |||||
| 71 | Seventh lens | 65.00 | 1.32 | Glass | 1.77 | 49.5 | 6.6 |
| 72 | -5.50 | 1.1 | |||||
| 8 | Flat glass | Plane surface | 0.30 | Glass | 1.52 | 64.2 | - |
| - | Plane surface | 2.43 | |||||
| 100 | Imaging surface | - | - |
For detailed data of the parameters of each aspheric surface in this embodiment, please refer to the following table:
| surface of the body | 41 | 42 | 71 | 72 |
| K＝ | 0.088 | 10.22 | -200 | -20.9 |
| a 4 ＝ | 8.51E-05 | 4.57E-03 | 4.75E-03 | -9.97E-3 |
| a 6 ＝ | -4.73E-05 | -4.57E-03 | 2.32E-03 | 4.15E-3 |
| a 8 ＝ | 2.49E-05 | 9.95E-03 | -4.91E-4 | -5.84E-5 |
| a 10 ＝ | -4.10E-06 | -0.011 | 1.27E-5 | 9.69E-5 |
| a 12 ＝ | 3.02E-07 | 4.68E-03 | -1.49E-5 | -4.99E-6 |
The numerical values of the respective conditional expressions of this embodiment are shown in fig. 16.
The MTF transfer function curves of the 0.435-0.656um segment of this embodiment are shown in detail in fig. 12, the field curves and distortion diagrams are shown in detail in fig. 13 (a) and 13 (B), the vertical axis chromatic aberration diagrams are shown in detail in fig. 14,0.435-0.656um segment defocus curves are shown in detail in fig. 15.
In this embodiment, the focal length f=4.4 mm of the optical imaging lens; aperture value fno=2.8; the image plane size Φ=8mm; the distance ttl=19.5 mm from the first lens 1 to the imaging plane 100 on the optical axis I, the main incident angle car=34°, and the chromatic aberration is lca=1 um.
The invention adopts seven lenses, and has the advantages of large main incidence angle (CRA is more than or equal to 33 degrees), good resolution (the optical transfer function can reach 250lp/mm and 4K image quality), extremely small chromatic aberration (435 nm-656nm section and chromatic aberration less than 1 um), optical distortion less than 6 percent, small volume (TTL is less than or equal to 20mm and outer diameter less than 13 mm) and light weight (weight less than 5 g) by arranging the refractive index and the concave-convex curved surfaces of each lens.
While the invention has been particularly shown and described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (9)
1. An optical imaging lens, characterized in that: the lens system comprises a first lens, a second lens, a third lens, a fourth lens, a diaphragm, a fifth lens, a sixth lens and a seventh lens in sequence from an object side to an image side along an optical axis; the first lens element to the seventh lens element each comprise an object side surface facing the object side and allowing the imaging light to pass therethrough, and an image side surface facing the image side and allowing the imaging light to pass therethrough;
the first lens has negative refractive index, the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface;
the second lens has negative refractive index, and the object side surface of the second lens is a concave surface;
the third lens has positive refractive index, and the image side surface of the third lens is a convex surface;
the fourth lens has positive refractive index, the object side surface of the fourth lens is a convex surface, the image side surface of the fourth lens is a concave surface, and the object side surface and the image side surface of the fourth lens are aspheric surfaces;
the fifth lens has positive refractive index, and the image side surface of the fifth lens is a convex surface;
the sixth lens has negative refractive index, and the object side surface of the sixth lens is a concave surface;
the seventh lens has positive refractive index, the image side surface of the seventh lens is a convex surface, and the object side surface and the image side surface of the seventh lens are aspheric;
the image side surface of the second lens is glued with the object side surface of the third lens;
the lens with the refractive index of the optical imaging lens is only provided with seven pieces, and the requirements are met: nd4 is more than or equal to 1.8, wherein Nd4 is the refractive index of the fourth lens at d line.
2. The optical imaging lens of claim 1, further satisfying: -3< f1/f < -1, 15 < R1 < 25, 3< R2 < 8, wherein f1 is the focal length of the first lens, f is the focal length of the optical imaging lens, R1 is the radius of curvature of the object side of the first lens, and R2 is the radius of curvature of the image side of the first lens.
3. The optical imaging lens of claim 1, further satisfying: vd2 is less than or equal to 30, vd3 is more than or equal to 50, vd3-Vd2 is more than 25, wherein Vd2 is the dispersion coefficient of the second lens at d line, and Vd3 is the dispersion coefficient of the third lens at d line.
4. The optical imaging lens as claimed in claim 1, wherein an image side surface of the fifth lens element and an object side surface of the sixth lens element are cemented with each other, and: vd5 is greater than or equal to 50, vd6 is less than or equal to 35, and Vd6-Vd5 is greater than 25, wherein Vd5 is the dispersion coefficient of the fifth lens at d-line, and Vd6 is the dispersion coefficient of the sixth lens at d-line.
5. The optical imaging lens of claim 1, further satisfying: 0< f7/f <5, wherein f7 is the focal length of the seventh lens, and f is the focal length of the optical imaging lens.
6. The optical imaging lens of claim 1, further satisfying: t1 > 1.0,1.5< T23<4.0,1.5< T56<3.0, wherein T1 is the thickness of the first lens on the optical axis, T23 is the sum of the thicknesses of the second and third lenses on the optical axis, and T56 is the sum of the thicknesses of the fifth and sixth lenses on the optical axis.
7. The optical imaging lens of claim 1, further satisfying: ALT <15, ALG <5, where ALG is the sum of the air gaps of the first lens to the seventh lens on the optical axis, ALT is the sum of the thicknesses of the seven lenses of the first lens to the seventh lens on the optical axis.
8. The optical imaging lens of claim 1, further satisfying: ALT/ALG <4.2, wherein ALG is the sum of the air gaps of the first lens to the seventh lens on the optical axis, and ALT is the sum of the thicknesses of the seven lenses of the first lens to the seventh lens on the optical axis.
9. The optical imaging lens of claim 1, wherein: the fourth lens and the fifth lens are arranged next to each other, the lenses are directly supported, and the diaphragm is realized by adopting a soma shading sheet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910231571.9A CN109839730B (en) | 2019-03-26 | 2019-03-26 | Optical imaging lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910231571.9A CN109839730B (en) | 2019-03-26 | 2019-03-26 | Optical imaging lens |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109839730A CN109839730A (en) | 2019-06-04 |
| CN109839730B true CN109839730B (en) | 2023-07-25 |
Family
ID=66886326
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910231571.9A Active CN109839730B (en) | 2019-03-26 | 2019-03-26 | Optical imaging lens |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109839730B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021128122A1 (en) * | 2019-12-26 | 2021-07-01 | 诚瑞光学(常州)股份有限公司 | Camera optical lens |
| WO2021128134A1 (en) * | 2019-12-26 | 2021-07-01 | 诚瑞光学(常州)股份有限公司 | Camera optical lens |
| CN111007640B (en) * | 2019-12-26 | 2022-05-03 | 诚瑞光学(常州)股份有限公司 | Image pickup optical lens |
| WO2021128139A1 (en) * | 2019-12-26 | 2021-07-01 | 诚瑞光学(常州)股份有限公司 | Camera optical lens |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08201693A (en) * | 1995-01-27 | 1996-08-09 | Nikon Corp | Zoom lens |
| JPH08254653A (en) * | 1995-03-16 | 1996-10-01 | Hitachi Ltd | Zoom lens |
| CN1152717A (en) * | 1995-09-29 | 1997-06-25 | 三星航空产业株式会社 | Fast photographic lens system |
| JPH10253882A (en) * | 1997-03-07 | 1998-09-25 | Tochigi Nikon:Kk | Two-group zoom lens |
| JP2002277740A (en) * | 2001-03-19 | 2002-09-25 | Asahi Optical Co Ltd | Zoom lens system |
| CN1383018A (en) * | 2001-04-23 | 2002-12-04 | 株式会社尼康 | Vari-focus lens system |
| CN102388331A (en) * | 2009-04-24 | 2012-03-21 | 株式会社理光 | Wide angle lens and imaging device |
| CN209496194U (en) * | 2019-03-26 | 2019-10-15 | 厦门力鼎光电股份有限公司 | A kind of optical imaging lens |
-
2019
- 2019-03-26 CN CN201910231571.9A patent/CN109839730B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08201693A (en) * | 1995-01-27 | 1996-08-09 | Nikon Corp | Zoom lens |
| JPH08254653A (en) * | 1995-03-16 | 1996-10-01 | Hitachi Ltd | Zoom lens |
| CN1152717A (en) * | 1995-09-29 | 1997-06-25 | 三星航空产业株式会社 | Fast photographic lens system |
| JPH10253882A (en) * | 1997-03-07 | 1998-09-25 | Tochigi Nikon:Kk | Two-group zoom lens |
| JP2002277740A (en) * | 2001-03-19 | 2002-09-25 | Asahi Optical Co Ltd | Zoom lens system |
| CN1383018A (en) * | 2001-04-23 | 2002-12-04 | 株式会社尼康 | Vari-focus lens system |
| CN102388331A (en) * | 2009-04-24 | 2012-03-21 | 株式会社理光 | Wide angle lens and imaging device |
| CN209496194U (en) * | 2019-03-26 | 2019-10-15 | 厦门力鼎光电股份有限公司 | A kind of optical imaging lens |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109839730A (en) | 2019-06-04 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109839730B (en) | Optical imaging lens | |
| CN109541784B (en) | Optical imaging lens | |
| CN110031953B (en) | Optical imaging lens | |
| CN110456486B (en) | Optical imaging lens | |
| CN111999869A (en) | Infrared confocal zoom lens | |
| CN110542997A (en) | Optical imaging lens | |
| CN111722378A (en) | Large-image-plane high-resolution fisheye lens | |
| CN109814239B (en) | Fish-eye lens | |
| CN210294655U (en) | Optical imaging lens | |
| CN112612115A (en) | Optical imaging lens | |
| CN111751962A (en) | Small-size optical imaging lens who leads to light greatly | |
| CN110308542B (en) | Optical imaging lens | |
| CN209496194U (en) | A kind of optical imaging lens | |
| CN111190267A (en) | Wide-angle optical imaging lens | |
| CN212229305U (en) | Optical imaging lens of large-image-surface wide-angle TOF | |
| CN213780515U (en) | Optical imaging lens and panoramic lens | |
| CN213780517U (en) | Optical imaging lens | |
| CN212276080U (en) | Small-size optical imaging lens who leads to light greatly | |
| CN214151204U (en) | Optical imaging lens with large image surface | |
| CN213544944U (en) | Optical imaging lens | |
| CN213544942U (en) | Small-size optical imaging lens who leads to light greatly | |
| CN212321968U (en) | Large-image-plane high-resolution fisheye lens | |
| CN213780521U (en) | Optical imaging lens for long-wave infrared | |
| CN213544943U (en) | Optical imaging lens | |
| CN212647138U (en) | Infrared confocal zoom lens |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |