CN111061045B - Optical imaging lens - Google Patents
Optical imaging lens Download PDFInfo
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- CN111061045B CN111061045B CN202010045034.8A CN202010045034A CN111061045B CN 111061045 B CN111061045 B CN 111061045B CN 202010045034 A CN202010045034 A CN 202010045034A CN 111061045 B CN111061045 B CN 111061045B
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- 238000012634 optical imaging Methods 0.000 title claims abstract description 65
- 238000003384 imaging method Methods 0.000 claims abstract description 13
- 230000003287 optical effect Effects 0.000 claims description 35
- 239000006185 dispersion Substances 0.000 claims description 14
- 230000008859 change Effects 0.000 claims description 10
- 101000658638 Arabidopsis thaliana Protein TRANSPARENT TESTA 1 Proteins 0.000 claims description 6
- 101100262183 Arabidopsis thaliana TTL2 gene Proteins 0.000 claims description 6
- 102100021334 Bcl-2-related protein A1 Human genes 0.000 claims description 3
- 101000894929 Homo sapiens Bcl-2-related protein A1 Proteins 0.000 claims description 3
- 230000004075 alteration Effects 0.000 abstract description 30
- 238000010586 diagram Methods 0.000 description 20
- 239000011521 glass Substances 0.000 description 14
- 239000000463 material Substances 0.000 description 9
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 6
- 229910052782 aluminium Inorganic materials 0.000 description 6
- 230000014509 gene expression Effects 0.000 description 5
- 125000006850 spacer group Chemical group 0.000 description 5
- 230000003746 surface roughness Effects 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 230000002349 favourable effect Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000012546 transfer Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000005286 illumination Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 230000000007 visual effect Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
- G02B7/028—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with means for compensating for changes in temperature or for controlling the temperature; thermal stabilisation
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Abstract
The invention relates to the technical field of lenses. The invention discloses an optical imaging lens, which comprises thirteen lenses, wherein a first lens has positive refractive index, the object side surface is a convex surface, a second lens and an eighth lens are convex-concave lenses with negative refractive index, a third lens is a concave-concave lens with negative refractive index, a fourth lens is a concave-convex lens with positive refractive index, a fifth lens, a sixth lens and a thirteenth lens are convex-convex lenses with positive refractive index, a seventh lens has positive refractive index, the object side surface is a convex surface, a ninth lens is a convex-concave lens with positive refractive index, a tenth lens is a plano-convex lens with positive refractive index, and eleventh and twelfth lenses are concave-convex lenses with negative refractive index; the eighth lens is cemented with the ninth lens, and the tenth lens is cemented with the eleventh lens. The invention has high resolution, small chromatic aberration and good imaging quality; little or no defocus at high and low temperature; the light is large, and the relative illuminance is high; the advantage of large image surface.
Description
Technical Field
The invention belongs to the technical field of lenses, and particularly relates to an optical imaging lens.
Background
With the continuous progress of science and technology and the continuous development of society, in recent years, an optical imaging lens is also rapidly developed and is widely applied to various fields such as smart phones, tablet personal computers, video conferences, vehicle-mounted monitoring, security monitoring and intelligent transportation systems, and therefore, the requirements on the optical imaging lens are also higher and higher.
In an intelligent traffic system, the performance of an optical imaging lens is critical, and the reliability of the whole system can be affected. However, the optical imaging lens with the focal length of 12mm, which is currently applied to an intelligent traffic system, has the disadvantages of poor transfer control, low resolution and uneven images; the edge color difference is large, and the color reduction degree is poor; when the lens is used in a high-low temperature environment, the defocus is serious; the light transmission is generally smaller, the light incoming quantity is lower in a low-illumination environment, and the photographed image is darker; the image plane is smaller, the size of the image plane can only reach 16mm, the incidence angle of the chief ray is larger, the CRA is larger than 12 degrees, the relative illumination is lower than 40 percent, and the increasing requirements of an intelligent traffic system can not be met, so that improvement is urgently needed.
Disclosure of Invention
The present invention is directed to an optical imaging lens for solving the above-mentioned 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 and a fourth lens from an object side to an image side along an optical axis; the first lens element to the thirteenth lens element each comprise an object side surface facing the object side and passing the imaging light and an image side surface facing the image side and passing the imaging light;
The first lens has positive refractive index, and the object side surface of the first lens is a convex surface;
the second lens has negative refractive index, the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a concave surface;
The third lens has negative refractive index, the object side surface of the third lens is a concave surface, and the image side surface of the third lens is a concave surface;
the fourth lens has positive refractive index, the object side surface of the fourth lens is a concave surface, and the image side surface of the fourth lens is a convex surface;
the fifth lens has positive refractive index, the object side surface of the fifth lens is a convex surface, and the image side surface of the fifth lens is a convex surface;
the sixth lens element has positive refractive index, wherein the object-side surface of the sixth lens element is convex, and the image-side surface of the sixth lens element is convex;
the seventh lens has positive refractive index, and the object side surface of the seventh lens is a convex surface;
The eighth lens has negative refractive power, the object side surface of the eighth lens is a convex surface, and the image side surface of the eighth lens is a concave surface;
The ninth lens has positive refractive index, the object side surface of the ninth lens is a convex surface, and the image side surface of the ninth lens is a concave surface;
The tenth lens has positive refractive index, the object side surface of the tenth lens is a plane, and the image side surface of the tenth lens is a convex surface;
the eleventh lens has negative refractive index, the object side surface of the eleventh lens is a concave surface, and the image side surface of the eleventh lens is a convex surface;
The twelfth lens has negative refractive index, the object side surface of the twelfth lens is a concave surface, and the image side surface of the twelfth lens is a convex surface;
The thirteenth lens has positive refractive index, the object side surface of the thirteenth lens is a convex surface, and the image side surface of the thirteenth lens is a convex surface;
the image side surface of the eighth lens and the object side surface of the ninth lens are mutually glued; the image side surface of the tenth lens is glued with the object side surface of the eleventh lens; the optical imaging lens has thirteen lenses with refractive index.
Further, the optical imaging lens further satisfies: 0.8< |r91/r102| <1.1,0.3 | < r81/r112| <0.6, wherein R81 is the radius of curvature of the object side of the eighth lens element, R91 is the radius of curvature of the object side of the ninth lens element, R102 is the radius of curvature of the image side of the tenth lens element, and R112 is the radius of curvature of the image side of the eleventh lens element.
Further, the optical imaging lens further satisfies: 0.9< |r31/r32| <1.25, wherein R31 and R32 are radii of curvature of the object-side and image-side surfaces of the third lens, respectively.
Further, the optical imaging lens further satisfies: nd4 is equal to or greater than 1.9, vd5 is equal to or greater than 21, nd5 is equal to or greater than 1.9, wherein nd4 is the refractive index of the fourth lens, nd5 and vd5 are the refractive index and the dispersion coefficient of the fifth lens, and the relative partial dispersion of the fifth lens is >0.63.
Further, the optical imaging lens further satisfies: 0< |R42/R51| <0.5, wherein R42 is the radius of curvature of the image side of the fourth lens element, and R51 is the radius of curvature of the object side of the fifth lens element.
Further, the optical imaging lens is assembled with the camera in a matching way through the base, the back focal length change quantity of the base caused by high temperature or low temperature is delta BFL1, the back focal length change quantity of the first lens to the thirteenth lens and the air interval between the first lens and the thirteenth lens caused by high temperature or low temperature is delta BFL2, and the requirements of delta BFL 1-delta BFL2 = 0 are met.
Still further, the base is made of an aluminum material having a linear expansion coefficient of 23.6E-06.
Still further, a spacer provided between the first lens to the thirteenth lens is also included, and the spacer is made of an aluminum material having a linear expansion coefficient of 23.6E-06.
Further, the refractive index temperature coefficients of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the eighth lens, the tenth lens, the eleventh lens, the twelfth lens and the thirteenth lens are positive, the refractive index temperature coefficients of the sixth lens, the seventh lens and the ninth lens are negative, and the |Δbfl3|Δbfl4| is satisfied, wherein Δbfl3 is the back focal length change amount of the second lens, the third lens, the sixth lens, the seventh lens, the eighth lens, the ninth lens, the eleventh lens and the twelfth lens due to high temperature or low temperature, and Δbfl4 is the back focal length change amount of the first lens, the fourth lens, the fifth lens, the tenth lens and the thirteenth lens due to high temperature or low temperature.
Further, the optical imaging lens further satisfies: vd8 is less than or equal to 25, vd9 is less than or equal to 70, vd10 is less than or equal to 54, vd11 is less than or equal to 24, and |vd8-vd9| >45, |vd10-vd11| >30, wherein vd8, vd9, vd10 and vd11 are the dispersion coefficients of the eighth lens, the ninth lens, the tenth lens and the eleventh lens, respectively.
Further, the optical imaging lens further satisfies: nd13 is equal to or greater than 1.9, vd13<21, wherein nd13 and vd13 are refractive index and Abbe number of the thirteenth lens, respectively, and relative partial dispersion of the thirteenth lens is >0.63.
Further, the optical imaging lens further satisfies: 1.3< TTL1/TTL2<1.7, wherein TTL1 is the distance between the object side surface of the first lens element and the image side surface of the fifth lens element on the optical axis, and TTL2 is the distance between the object side surface of the sixth lens element and the image side surface of the thirteenth lens element on the optical axis.
Further, the lens system further comprises a diaphragm, wherein the diaphragm is arranged between the fifth lens and the sixth lens.
Further, the optical imaging lens further satisfies: 0.5< T9/T10<1, wherein T9 is the thickness of the ninth lens on the optical axis, and T10 is the thickness of the tenth lens on the optical axis.
Further, the optical imaging lens further satisfies: TTL/BFL <8.5, where TTL is the distance on the optical axis from the object side surface of the first lens to the imaging surface, and BFL is the back focal length of the optical imaging lens.
The beneficial technical effects of the invention are as follows:
the invention adopts thirteen lenses, and has high resolution and uniform image through the arrangement design of the refractive index and the surface shape of each lens; the visual field color difference is small, and the color reproducibility is good; the whole system is optimized without heating, is focused at normal temperature, and has little or no defocus at high and low temperatures; the light transmission is large, more light entering quantity can be obtained, and the shot picture is brighter; the image plane is larger, the incidence angle of the chief ray is smaller, and the relative illuminance is higher.
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 showing MTF at room temperature (20 ℃ C.) of 0.435-0.656 μm according to example I of the present invention;
FIG. 3 is a graph showing MTF at high temperature (70 ℃ C.) of 0.435-0.656 μm in example I of the present invention;
FIG. 4 is a graph showing MTF at low temperature (-30 ℃) of 0.435-0.656 μm for example of the invention;
FIG. 5 is a graph showing the relative illuminance of 0.546 μm according to the first embodiment of the present invention;
FIG. 6 is a diagram illustrating a graph of a vertical aberration curve according to a first embodiment of the present invention;
FIG. 7 is a schematic diagram of a graph of lateral chromatic aberration in accordance with a first embodiment of the present invention;
FIG. 8 is a graph showing MTF at room temperature (20 ℃ C.) of 0.435-0.656 μm in example II of the invention;
FIG. 9 is a graph of MTF at high temperature (70 ℃ C.) of 0.435-0.656 μm for example II of the present invention;
FIG. 10 is a graph showing MTF at low temperature (-30 ℃) of 0.435-0.656 μm for example II of the invention;
FIG. 11 is a graph showing the relative illuminance of 0.546 μm in the second embodiment of the present invention;
FIG. 12 is a diagram illustrating a graph of a vertical aberration curve according to a second embodiment of the present invention;
FIG. 13 is a schematic diagram of a graph of lateral chromatic aberration in accordance with a second embodiment of the present invention;
FIG. 14 is a graph showing MTF at room temperature (20 ℃ C.) of 0.435 to 0.656 μm in example III of the present invention;
FIG. 15 is a graph of MTF at 0.435-0.656 μm at high temperature (70 ℃) for example of the invention;
FIG. 16 is a graph of MTF at low temperature (-30 ℃) of 0.435-0.656 μm for example III of the invention;
FIG. 17 is a graph showing the relative illuminance of 0.546 μm in the third embodiment of the present invention;
FIG. 18 is a diagram showing a graph of a vertical aberration curve according to the third embodiment of the present invention;
FIG. 19 is a schematic view of a graph showing lateral chromatic aberration curves according to a third embodiment of the present invention;
FIG. 20 is a graph showing MTF at room temperature (20 ℃) of 0.435 to 0.656 μm in example four of the invention;
FIG. 21 is a graph showing MTF at high temperature (70 ℃ C.) of 0.435 to 0.656 μm in example IV of the present invention;
FIG. 22 is a graph showing MTF at low temperature (-30 ℃) of 0.435-0.656 μm for example IV of the invention;
FIG. 23 is a graph showing the relative illuminance of 0.546 μm in the fourth embodiment of the present invention;
FIG. 24 is a diagram showing a graph of a vertical aberration curve according to a fourth embodiment of the present invention;
FIG. 25 is a schematic diagram showing a graph of lateral chromatic aberration in accordance with a fourth embodiment of the present invention;
FIG. 26 is a graph of MTF at five normal temperatures (20 ℃ C.) for an example of the present invention at 0.435-0.656 μm;
FIG. 27 is a graph showing MTF at a fifth high temperature (70 ℃ C.) of 0.435 to 0.656 μm in the example of the present invention;
FIG. 28 is a graph showing MTF at low temperature (-30 ℃) of 0.435-0.656 μm for example five of the invention;
FIG. 29 is a graph showing the relative illuminance of 0.546 μm in the fifth embodiment of the present invention;
FIG. 30 is a diagram showing a graph of a vertical aberration curve according to a fifth embodiment of the present invention;
FIG. 31 is a schematic diagram showing a graph of lateral chromatic aberration in fifth embodiment of the present invention;
Fig. 32 is a table showing values of relevant important parameters according to five 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)" as used herein 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 table (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 and a fourth lens from an object side to an image side along an optical axis; the first lens element to the thirteenth lens element each comprise an object side surface facing the object side and passing the image light and an image side surface facing the image side and passing the image light.
The first lens has positive refractive index, and the object side surface of the first lens is a convex surface.
The second lens has negative refractive index, the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a concave surface, which is favorable for correcting distortion.
The third lens has negative refractive power, the object side surface of the third lens is a concave surface, and the image side surface of the third lens is a concave surface.
The fourth lens element has positive refractive power, wherein an object-side surface of the fourth lens element is concave, and an image-side surface of the fourth lens element is convex.
The fifth lens element has positive refractive index, wherein an object-side surface of the fifth lens element is convex, and an image-side surface of the fifth lens element is convex.
The sixth lens element has positive refractive power, wherein an object-side surface of the sixth lens element is convex, and an image-side surface of the sixth lens element is convex.
The seventh lens has positive refractive index, and the object side surface of the seventh lens is a convex surface.
The eighth lens element has a negative refractive power, wherein an object-side surface of the eighth lens element is convex, and an image-side surface of the eighth lens element is concave.
The ninth lens element has positive refractive power, wherein an object-side surface of the ninth lens element is convex, and an image-side surface of the ninth lens element is concave.
The tenth lens has positive refractive index, the object side surface of the tenth lens is a plane, the image side surface of the tenth lens is a convex surface, the object side surface of the tenth lens adopts a plane, the ninth lens can be directly supported on the tenth lens, the interval can be controlled to be 0.01mm, and good tolerance support of structural design is provided.
The eleventh lens has negative refractive power, the object side surface of the eleventh lens is a concave surface, and the image side surface of the eleventh lens is a convex surface.
The twelfth lens element has a negative refractive power, wherein an object-side surface of the twelfth lens element is concave, and an image-side surface of the twelfth lens element is convex.
The thirteenth lens has positive refractive index, the object side surface of the thirteenth lens is a convex surface, and the image side surface of the thirteenth lens is a convex surface.
The image side surface of the eighth lens and the object side surface of the ninth lens are mutually glued; the image side surface of the tenth lens is glued with the object side surface of the eleventh lens; the optical imaging lens has thirteen lenses with refractive index.
The invention adopts thirteen lenses, and has high resolution and uniform image through the arrangement design of the refractive index and the surface shape of each lens; the visual field color difference is small, and the color reproducibility is good; the whole system is optimized without heating, is focused at normal temperature, and has little or no defocus at high and low temperatures; the light transmission is large, more light entering quantity can be obtained, and the shot picture is brighter; the image plane is larger, the incidence angle of the chief ray is smaller, and the relative illuminance is higher.
Preferably, the optical imaging lens further satisfies: 0.8< |R91/R102| <1.1,0.3 | < R81/R112| <0.6, wherein R81 is the radius of curvature of the object side surface of the eighth lens, R91 is the radius of curvature of the object side surface of the ninth lens, R102 is the radius of curvature of the image side surface of the tenth lens, and R112 is the radius of curvature of the image side surface of the eleventh lens, so that the overall optical performance of the optical imaging lens such as MTF value, chromatic aberration and the like is further improved.
Preferably, the optical imaging lens further satisfies: 0.9< |R31/R32| <1.25, wherein R31 and R32 are the curvature radiuses of the object side surface and the image side surface of the third lens respectively, so that the overall optical performance of the optical imaging lens is further improved.
Preferably, the optical imaging lens further satisfies: nd4 is more than or equal to 1.9, vd5 is less than or equal to 21, nd5 is more than or equal to 1.9, wherein nd4 is the refractive index of the fourth lens, nd5 and vd5 are the refractive index and the dispersion coefficient of the fifth lens, and the relative partial dispersion of the fifth lens is more than 0.63, so that chromatic aberration is further eliminated.
Preferably, the optical imaging lens further satisfies: 0< |R42/R51| <0.5, wherein R42 is the curvature radius of the image side surface of the fourth lens, and R51 is the curvature radius of the object side surface of the fifth lens, so that the overall optical performance of the optical imaging lens is further improved.
Preferably, the optical imaging lens is assembled with the camera through the base in a matching way, the back focal length variation of the base caused by high temperature or low temperature is delta BFL1, the back focal length variation of the first lens to the thirteenth lens and the air interval between the first lens and the thirteenth lens caused by high temperature or low temperature is delta BFL2, delta BFL 1-delta BFL 2=0 is met, the defocus at high temperature and low temperature is further reduced, normal temperature focusing is achieved, the high temperature and low temperature are not defocus, namely the optical imaging lens and the camera are athermalized, and the imaging system is clear at normal temperature and high temperature and low temperature.
More preferably, the base is made of an aluminum material having a linear expansion coefficient of 23.6E-06, advantageously achieving ΔBFL1- ΔBF2=0, reducing process difficulty, although in some embodiments the base may be made of a plastic or other material having a linear expansion coefficient of 23.6E-06 or near 23.6E-06.
More preferably, the lens further comprises a spacer ring arranged between the first lens and the thirteenth lens, and the spacer ring is made of an aluminum material with a linear expansion coefficient of 23.6E-06, so that ΔBFL1- ΔBFL2=0 is more beneficial to realizing, and the process difficulty is reduced.
More preferably, the refractive index temperature coefficients of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the eighth lens, the tenth lens, the eleventh lens, the twelfth lens and the thirteenth lens are positive, the refractive index temperature coefficients of the sixth lens, the seventh lens and the ninth lens are negative, and the |Δbfl3|Δbfl4| is satisfied, wherein Δbfl3 is the back focal length variation of the second lens, the third lens, the sixth lens, the seventh lens, the eighth lens, the ninth lens, the eleventh lens and the twelfth lens due to high temperature or low temperature, and Δbfl4 is the back focal length variation of the first lens, the fourth lens, the fifth lens, the tenth lens and the thirteenth lens due to high temperature or low temperature, which is more favorable for realizing Δbfl1- Δbfl2=0 and reducing the process difficulty.
Preferably, the optical imaging lens further satisfies: vd8 is less than or equal to 25, vd9 is more than or equal to 70, vd10 is more than or equal to 54, vd11 is less than or equal to 24, and |vd8-vd9| >45, |vd10-vd11| >30, wherein vd8, vd9, vd10 and vd11 are the dispersion coefficients of the eighth lens, the ninth lens, the tenth lens and the eleventh lens respectively, which is favorable for further correcting chromatic aberration, optimizing image quality and improving system performance.
Preferably, the optical imaging lens further satisfies: nd13 is not less than 1.9, vd13<21, wherein nd13 and vd13 are refractive index and dispersion coefficient of the thirteenth lens, respectively, and relative partial dispersion of the thirteenth lens is >0.63, further eliminating chromatic aberration.
Preferably, the optical imaging lens further satisfies: 1.3< TTL1/TTL2<1.7, wherein TTL1 is the distance between the object side surface of the first lens element and the image side surface of the fifth lens element on the optical axis, and TTL2 is the distance between the object side surface of the sixth lens element and the image side surface of the thirteenth lens element on the optical axis, and the total length of the optical imaging lens assembly is further controlled.
Preferably, the lens assembly further comprises a diaphragm, wherein the diaphragm is arranged between the fifth lens and the sixth lens, and reduces the tolerance sensitivity of the system.
Preferably, the optical imaging lens further satisfies: 0.5< T9/T10<1, wherein T9 is the thickness of the ninth lens on the optical axis, T10 is the thickness of the tenth lens on the optical axis, and the structure is compact and the manufacturability is good.
Preferably, the optical imaging lens further satisfies: TTL/BFL <8.5, wherein TTL is the distance from the object side surface of the first lens to the imaging surface on the optical axis, BFL is the back focal length of the optical imaging lens, and the total length of the optical imaging lens is further controlled, and the back focal length is longer.
The optical imaging lens of the present invention will be described in detail with specific examples.
Example 1
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 fifth lens 5, a stop 140, a sixth lens 6, a seventh lens 7, an eighth lens 8, a ninth lens 9, a tenth lens 100, an eleventh lens 110, a twelfth lens 120, a thirteenth lens 130, a protective sheet 150, and an imaging surface 160; the first lens element 1 to the thirteenth lens element 130 respectively comprise an object side surface facing the object side A1 and passing the imaging light and an image side surface facing the image side A2 and passing the imaging light.
The first lens element 1 has a positive refractive power, the object-side surface 11 of the first lens element 1 is convex, and the image-side surface 12 of the first lens element 1 is planar, however, in some embodiments, the image-side surface 12 of the first lens element 1 can be concave or convex.
The second lens element 2 has a negative refractive power, wherein an object-side surface 21 of the second lens element 2 is convex, and an image-side surface 22 of the second lens element 2 is concave.
The third lens element 3 has a negative 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 concave.
The fourth lens element 4 has a positive refractive power, wherein an object-side surface 41 of the fourth lens element 4 is concave, and an image-side surface 42 of the fourth lens element 4 is convex.
The fifth lens element 5 has a positive refractive power, wherein an object-side surface 51 of the fifth lens element 5 is convex, and an image-side surface 52 of the fifth lens element 5 is convex.
The sixth lens element 6 has a positive refractive power, wherein an object-side surface 61 of the sixth lens element 6 is convex, and an image-side surface 62 of the sixth lens element 6 is convex.
The seventh lens element 7 has positive refractive power, wherein the object-side surface 71 of the seventh lens element 7 is convex, and the image-side surface 72 of the seventh lens element 7 is concave, although the image-side surface 72 of the seventh lens element 7 can be concave or convex in some embodiments.
The eighth lens element 8 has a negative refractive power, wherein an object-side surface 81 of the eighth lens element 8 is convex, and an image-side surface 82 of the eighth lens element 8 is concave.
The ninth lens element 9 has a positive refractive power, wherein an object-side surface 91 of the ninth lens element 9 is convex, and an image-side surface 92 of the ninth lens element 9 is concave.
The tenth lens element 100 has a positive refractive power, an object-side surface 101 of the tenth lens element 100 is a plane, and an image-side surface 102 of the tenth lens element 100 is a convex surface.
The eleventh lens element 110 has a negative refractive power, wherein an object-side surface 111 of the eleventh lens element 110 is concave, and an image-side surface 102 of the eleventh lens element 110 is convex.
The twelfth lens element 120 has a negative refractive power, wherein an object-side surface 121 of the twelfth lens element 120 is concave, and an image-side surface 122 of the twelfth lens element 120 is convex.
The thirteenth lens element 130 has a positive refractive power, wherein an object-side surface 131 of the thirteenth lens element 130 is convex, and an image-side surface 132 of the thirteenth lens element 130 is convex.
The image side surface 82 of the eighth lens element 8 and the object side surface 91 of the ninth lens element 9 are cemented with each other; the image side surface 102 of the tenth lens 100 and the object side surface 111 of the eleventh lens 110 are cemented with each other.
In this embodiment, the refractive index temperature coefficients of the first lens 1, the second lens 2, the third lens 3, the fourth lens 4, the fifth lens 5, the eighth lens 8, the tenth lens 100, the eleventh lens 110, the twelfth lens 120 and the thirteenth lens 130 are positive, the refractive index temperature coefficients of the sixth lens 6, the seventh lens 7 and the ninth lens 9 are negative, and the delta BFL 3|delta BFL 4| is satisfied, wherein delta BFL3 is the back focal length change amount of the second lens 2, the third lens 3, the sixth lens 6, the seventh lens 7, the eighth lens 8, the ninth lens 9, the eleventh lens 110 and the twelfth lens 120 due to the high temperature or the low temperature, and delta BFL4 is the back focal length change amount of the first lens 1, the fourth lens 4, the fifth lens 5, the tenth lens 100 and the thirteenth lens 130 due to the high temperature or the low temperature.
In this embodiment, the optical imaging lens further includes a mount (not shown) assembled by matching the mount with the camera, the mount is made of an aluminum material having a linear expansion coefficient of 23.6E-06, the spacer provided between the first lens 1 to the thirteenth lens 130 is also made of an aluminum material having a linear expansion coefficient of 23.6E-06, the mount has a back focal length change amount Δbfl1 due to high temperature or low temperature, and the first lens 1 to the thirteenth lens 130 and the air space therebetween have a back focal length change amount Δbfl2 due to high temperature or low temperature, satisfying Δbfl1 to Δbfl2=0.
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 | Caliber/mm | Radius of curvature/mm | Thickness/mm | Material of material | Refractive index | Coefficient of dispersion | Focal length/mm | |
| - | Object plane | 0 | Infinity | Infinity | ||||
| 11 | First lens | 42.40 | 46.501 | 7.20 | Glass | 1.55 | 63.37 | 83.85 |
| 12 | 39.65 | Infinity | 0.15 | |||||
| 21 | Second lens | 28.68 | 33.561 | 1.60 | Glass | 1.75 | 52.34 | -29.73 |
| 22 | 21.40 | 13.209 | 8.35 | |||||
| 31 | Third lens | 19.99 | -27.355 | 1.40 | Glass | 1.78 | 25.72 | -16.73 |
| 32 | 18.81 | 26.276 | 2.24 | |||||
| 41 | Fourth lens | 18.86 | -209.111 | 9.57 | Glass | 2.00 | 25.44 | 45.54 |
| 42 | 24.00 | -38.568 | 6.90 | |||||
| 51 | Fifth lens | 24.00 | 169.511 | 4.73 | Glass | 1.95 | 17.94 | 61.24 |
| 52 | 24.00 | -88.531 | 12.77 | |||||
| 140 | Diaphragm | 20.16 | Infinity | 1.11 | ||||
| 61 | Sixth lens | 22.50 | 44.169 | 4.51 | Glass | 1.59 | 68.62 | 51.47 |
| 62 | 22.50 | -95.988 | 0.10 | |||||
| 71 | Seventh lens | 22.50 | 19.325 | 5.44 | Glass | 1.59 | 68.62 | 34.76 |
| 72 | 17.52 | 264.088 | 0.10 | |||||
| 81 | Eighth lens | 22.50 | 19.685 | 1.30 | Glass | 1.85 | 23.79 | -21.62 |
| 82 | 15.20 | 9.244 | 0 | |||||
| 91 | Ninth lens | 15.20 | 9.244 | 3.81 | Glass | 1.50 | 81.59 | 45.19 |
| 92 | 13.45 | 13.528 | 1.93 | |||||
| 101 | Tenth lens | 15.20 | Infinity | 4.89 | Glass | 1.73 | 54.67 | 13.30 |
| 102 | 15.20 | -9.743 | 0 | |||||
| 111 | Eleventh lens | 15.20 | -9.743 | 1.10 | Glass | 1.85 | 23.79 | -15.33 |
| 112 | 20.00 | -39.910 | 1.22 | |||||
| 121 | Twelfth lens | 15.31 | -17.780 | 1.10 | Glass | 1.78 | 25.72 | -39.03 |
| 122 | 20.00 | -43.005 | 0.10 | |||||
| 131 | Thirteenth lens | 20.00 | 45.952 | 3.40 | Glass | 1.95 | 17.94 | 24.42 |
| 132 | 20 | -45.95171 | 1.20 | |||||
| 150 | Protective sheet | 18.22243 | Infinity | 1.80 | Glass | 1.52 | 64.21 | Infinity |
| - | 18.1504 | Infinity | 9.04 | |||||
| 160 | Imaging surface | 17.60598 | Infinity |
The numerical values of the related conditional expressions of this embodiment are shown in fig. 32.
2-4, It can be seen from the figure that the transfer function is well controlled, the resolution is high, the resolution of the whole field of view can reach 200lp/mm, 2000 ten thousand pixels can be supported, and the high and low temperature is almost not out of focus; the relative illuminance map is shown in fig. 5, and it can be seen that the relative illuminance is high; the vertical axis aberration diagram is shown in detail in fig. 6, the lateral aberration diagram is shown in detail in fig. 7, and it can be seen that the field of view has small aberration and good color reproducibility.
In this embodiment, the focal length f=12.3 mm, the aperture value fno=1.46, the image plane diameter Φ=17.6 mm, the field angle fov=73.6°, and the chief ray incidence angle cra=8.7° of the optical imaging lens.
Example two
In this embodiment, the surface roughness and refractive index of each lens are substantially the same as those of the first embodiment, and only the image side surface 12 of the first lens 1 is concave, and the optical parameters such as the radius of curvature and the lens thickness of each lens surface are also different.
The detailed optical data of this particular example are shown in Table 2-1.
Table 2-1 detailed optical data for example two
The numerical values of the related conditional expressions of this embodiment are shown in fig. 32.
Referring to fig. 8-10, it can be seen from the figure that the resolution of the embodiment is good, the resolution is high, the resolution of the full field of view can reach 200lp/mm, 2000 ten thousand pixels can be supported, and the high and low temperature is almost not out of focus; the relative illuminance map is shown in fig. 11, and it can be seen that the relative illuminance is high; the vertical axis aberration diagram is shown in detail in fig. 12, the lateral aberration diagram is shown in detail in fig. 13, and it can be seen that the field of view has small chromatic aberration and good color reproducibility.
In this embodiment, the focal length f=12.3 mm, the aperture value fno=1.46, the image plane diameter Φ=17.6 mm, the field angle fov=73.6°, and the chief ray incidence angle cra=9.9 °.
Example III
In this embodiment, the surface roughness and refractive index of each lens are substantially the same as those of the first embodiment, and only the image side surface 72 of the seventh lens 7 is a plane, and the optical parameters such as the radius of curvature and the lens thickness of each lens surface are also different.
The detailed optical data of this particular example are shown in Table 3-1.
Table 3-1 detailed optical data for example three
The numerical values of the related conditional expressions of this embodiment are shown in fig. 32.
With reference to fig. 14-16, it can be seen from the figure that the resolution of the embodiment is high, the resolution of the full field of view can reach 200lp/mm, 2000 ten thousand pixels can be supported, and the high and low temperature is almost not out of focus; the relative illuminance map is shown in fig. 17, and it can be seen that the relative illuminance is high; the vertical axis aberration diagram is shown in detail in fig. 18, the lateral aberration diagram is shown in detail in fig. 19, and it can be seen that the field of view has small aberration and good color reproducibility.
In this embodiment, the focal length f=12.3 mm, the aperture value fno=1.46, the image plane diameter Φ=17.6 mm, the field angle fov=73.6°, and the chief ray incidence angle cra=8.5° of the optical imaging lens.
Example IV
In this embodiment, the surface roughness and refractive index of each lens are the same as those of the first embodiment, and only the optical parameters such as the radius of curvature and the lens thickness of each lens surface are different.
The detailed optical data of this particular example are shown in Table 4-1.
Table 4-1 detailed optical data for example four
The numerical values of the related conditional expressions of this embodiment are shown in fig. 32.
With reference to fig. 20-22, it can be seen from the figure that the resolution of the embodiment is good, the resolution is high, the resolution of the full field of view can reach 200lp/mm, 2000 ten thousand pixels can be supported, and the high and low temperature is almost not out of focus; the relative illuminance map is shown in fig. 23, and it can be seen that the relative illuminance is high; the vertical axis aberration diagram is shown in detail in fig. 24, the lateral aberration diagram is shown in detail in fig. 25, and it can be seen that the field of view has small aberration and good color reproducibility.
In this embodiment, the focal length f=12.3 mm, the aperture value fno=1.46, the image plane diameter Φ=17.6 mm, the field angle fov=73.6°, and the chief ray incidence angle cra=8.5° of the optical imaging lens.
Example five
In this embodiment, the surface roughness and refractive index of each lens are the same as those of the first embodiment, and only the optical parameters such as the radius of curvature and the lens thickness of each lens surface are different.
The detailed optical data of this particular example are shown in Table 5-1.
Table 5-1 detailed optical data for example five
The numerical values of the related conditional expressions of this embodiment are shown in fig. 32.
26-28, It can be seen from the figure that the transfer function is well controlled, the resolution is high, the resolution of the whole field of view can reach 200lp/mm, 2000 ten thousand pixels can be supported, and the high and low temperature is almost not out of focus; the relative illuminance map is shown in fig. 29, and it can be seen that the relative illuminance is high; the vertical axis aberration diagram is shown in detail in fig. 30, the lateral aberration diagram is shown in detail in fig. 31, and it can be seen that the field of view has small aberration and good color reproducibility.
In this embodiment, the focal length f=12.3 mm, the aperture value fno=1.46, the image plane diameter Φ=17.6 mm, the field angle fov=73.6°, and the chief ray incidence angle cra=8.5° of the optical imaging 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 (8)
1. An optical imaging lens, characterized in that: the lens system comprises a first lens, a second lens, a third lens and a fourth lens, wherein the first lens and the thirteenth lens are sequentially arranged from an object side to an image side along an optical axis; the first lens element to the thirteenth lens element each comprise an object side surface facing the object side and passing the imaging light and an image side surface facing the image side and passing the imaging light;
The first lens has positive refractive index, and the object side surface of the first lens is a convex surface;
the second lens has negative refractive index, the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a concave surface;
The third lens has negative refractive index, the object side surface of the third lens is a concave surface, and the image side surface of the third lens is a concave surface;
the fourth lens has positive refractive index, the object side surface of the fourth lens is a concave surface, and the image side surface of the fourth lens is a convex surface;
the fifth lens has positive refractive index, the object side surface of the fifth lens is a convex surface, and the image side surface of the fifth lens is a convex surface;
the sixth lens element has positive refractive index, wherein the object-side surface of the sixth lens element is convex, and the image-side surface of the sixth lens element is convex;
the seventh lens has positive refractive index, and the object side surface of the seventh lens is a convex surface;
The eighth lens has negative refractive power, the object side surface of the eighth lens is a convex surface, and the image side surface of the eighth lens is a concave surface;
The ninth lens has positive refractive index, the object side surface of the ninth lens is a convex surface, and the image side surface of the ninth lens is a concave surface;
The tenth lens has positive refractive index, the object side surface of the tenth lens is a plane, and the image side surface of the tenth lens is a convex surface;
the eleventh lens has negative refractive index, the object side surface of the eleventh lens is a concave surface, and the image side surface of the eleventh lens is a convex surface;
The twelfth lens has negative refractive index, the object side surface of the twelfth lens is a concave surface, and the image side surface of the twelfth lens is a convex surface;
The thirteenth lens has positive refractive index, the object side surface of the thirteenth lens is a convex surface, and the image side surface of the thirteenth lens is a convex surface;
The image side surface of the eighth lens and the object side surface of the ninth lens are mutually glued; the image side surface of the tenth lens is glued with the object side surface of the eleventh lens; the optical imaging lens has thirteen lenses with refractive index;
the optical imaging lens satisfies the following conditions: nd4 is equal to or greater than 1.9, vd5 is equal to or less than 21, nd5 is equal to or greater than 1.9, wherein nd4 is the refractive index of the fourth lens, nd5 and vd5 are the refractive index and the dispersion coefficient of the fifth lens, and the relative partial dispersion of the fifth lens is >0.63;
the optical imaging lens is matched and assembled with the camera through the base, the back focal length variation of the base caused by high temperature or low temperature is delta BFL1, the back focal length variation of the first to thirteenth lenses and the air interval between the first and thirteenth lenses caused by high temperature or low temperature is delta BFL2, and delta BFL 1-delta BFL2 = 0 is met.
2. The optical imaging lens of claim 1, wherein the optical imaging lens further satisfies: 0.8< |r91/r102| <1.1,0.3 | < r81/r112| <0.6, wherein R81 is the radius of curvature of the object side of the eighth lens element, R91 is the radius of curvature of the object side of the ninth lens element, R102 is the radius of curvature of the image side of the tenth lens element, and R112 is the radius of curvature of the image side of the eleventh lens element.
3. The optical imaging lens of claim 1, wherein the optical imaging lens further satisfies: 0.9< |r31/r32| <1.25, wherein R31 and R32 are radii of curvature of the object-side and image-side surfaces of the third lens, respectively.
4. The optical imaging lens of claim 1, wherein the optical imaging lens further satisfies: 0< |R42/R51| <0.5, wherein R42 is the radius of curvature of the image side of the fourth lens element, and R51 is the radius of curvature of the object side of the fifth lens element.
5. The optical imaging lens of claim 1, wherein: the refractive index temperature coefficients of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the eighth lens, the tenth lens, the eleventh lens, the twelfth lens and the thirteenth lens are positive, the refractive index temperature coefficients of the sixth lens, the seventh lens and the ninth lens are negative, and the delta BFL3 delta BFL4 delta is satisfied, wherein delta BFL3 is the back focal length change amount of the second lens, the third lens, the sixth lens, the seventh lens, the eighth lens, the ninth lens, the eleventh lens and the twelfth lens caused by high temperature or low temperature, and delta BFL4 is the back focal length change amount of the first lens, the fourth lens, the fifth lens, the tenth lens and the thirteenth lens caused by high temperature or low temperature.
6. The optical imaging lens of claim 1, wherein the optical imaging lens further satisfies: vd8 is less than or equal to 25, vd9 is less than or equal to 70, vd10 is less than or equal to 54, vd11 is less than or equal to 24, and |vd8-vd9| >45, |vd10-vd11| >30, wherein vd8, vd9, vd10 and vd11 are the dispersion coefficients of the eighth lens, the ninth lens, the tenth lens and the eleventh lens, respectively.
7. The optical imaging lens of claim 1, wherein the optical imaging lens further satisfies: nd13 is equal to or greater than 1.9, vd13<21, wherein nd13 and vd13 are refractive index and Abbe number of the thirteenth lens, respectively, and relative partial dispersion of the thirteenth lens is >0.63.
8. The optical imaging lens of claim 1, wherein the optical imaging lens further satisfies: 1.3< TTL1/TTL2<1.7, wherein TTL1 is the distance between the object side surface of the first lens element and the image side surface of the fifth lens element on the optical axis, and TTL2 is the distance between the object side surface of the sixth lens element and the image side surface of the thirteenth lens element on the optical axis.
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