CN218158513U - Large-light-transmission optical lens - Google Patents
Large-light-transmission optical lens Download PDFInfo
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- CN218158513U CN218158513U CN202221909800.1U CN202221909800U CN218158513U CN 218158513 U CN218158513 U CN 218158513U CN 202221909800 U CN202221909800 U CN 202221909800U CN 218158513 U CN218158513 U CN 218158513U
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Abstract
The utility model relates to a camera lens technical field. The utility model discloses a large-light-transmission optical lens, which is provided with eleven lenses along an optical axis from an object side to an image side in sequence; the first lens element, the second lens element and the fourth lens element are convex-concave lenses with positive refractive power, the third lens element has negative refractive power and has a concave image-side surface, the fifth lens element is a convex-concave lens with negative refractive power, the sixth lens element has positive refractive power and has a convex object-side surface, the seventh lens element has negative refractive power and has a concave image-side surface, the eighth lens element and the tenth lens element are convex-convex lenses with positive refractive power, the ninth lens element has negative refractive power and has a concave object-side surface, and the eleventh lens element is a concave-concave lens with negative refractive power. The utility model has the advantages of large light transmission; the resolution ratio is high, and the imaging quality is good; the working distance range is wide; optical back focal length.
Description
Technical Field
The utility model belongs to the technical field of the camera lens, specifically relate to an optical lens of big light that leads to.
Background
Optical lenses have been widely used in smart phones, tablet computers, vehicle monitoring, security monitoring, unmanned aerial vehicle aerial photography, machine vision systems, video conferences, and other fields. Among them, with the rapid development of industrial automation, the machine vision requirement is also getting larger and larger, and the linear scanning lens is widely applied to various industry fields, such as production and manufacturing, quality inspection, logistics, medicine, scientific research, and the like, so that the requirement for the linear scanning lens used in the machine vision system is also getting higher and higher.
However, the existing linear scanning lens has many defects, such as that the light passing is generally small, so that the exposure of the sensor is insufficient, and external light supplement is required; the working distance range is narrow, and the detection application place is limited; low resolution, poor image quality, etc., and therefore, improvements are necessary to meet the increasing demands of consumers.
Disclosure of Invention
An object of the utility model is to provide a big optical lens who leads to light is used for solving the technical problem that above-mentioned exists.
In order to achieve the above object, the utility model adopts the following technical scheme: the optical lens with large light transmission sequentially comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens from an object side to an image side along an optical axis; the first lens, the second lens, the third lens and the fourth lens respectively comprise an object side surface which faces the object side and enables the imaging light to pass through and an image side surface which faces the image side and enables the imaging light to pass through;
the first lens element with positive refractive index has a convex object-side surface and a concave image-side surface;
the second lens element with positive refractive index has a convex object-side surface and a concave image-side surface;
the third lens element with negative refractive index has a concave image-side surface;
the fourth lens has positive refraction, 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 element with negative refractive index has a convex object-side surface and a concave image-side surface;
the sixth lens element with positive refractive index has a convex object-side surface;
the seventh lens element with negative refractive index has a concave image-side surface;
the eighth lens element with a positive refractive index has a convex object-side surface and a convex image-side surface;
the ninth lens element has a negative refractive index, and the object-side surface of the ninth lens element is concave;
the tenth lens element with positive refractive power has a convex object-side surface and a convex image-side surface;
the eleventh lens element with negative refractive power has a concave object-side surface and a concave image-side surface;
the optical lens has only the first lens element to the eleventh lens element.
Further, the third lens and the fourth lens are cemented with each other, and the tenth lens and the eleventh lens are cemented with each other.
Further, the optical lens further satisfies: -1.0 and n & ltu 1/f < -0.4 and 1.0 and n & ltu 2/f <1.5, wherein f is the focal length of the optical lens, fU1 is the combined focal length of the third lens and the fourth lens, and fU2 is the combined focal length of the tenth lens and the eleventh lens.
Further, the fifth lens and the sixth lens are cemented to each other, and the seventh lens, the eighth lens, and the ninth lens are cemented to each other in this order.
Further, the optical lens further satisfies: -0.8< -f8/f 7< -0.6, -0.5< -f8/f 9< -0.2, wherein f7, f8 and f9 are focal lengths of the seventh lens, the eighth lens and the ninth lens respectively.
Further, the optical lens further satisfies: nd7>1.90, wherein nd7 is the refractive index of the seventh lens.
Further, the optical lens further satisfies: y '/f >0.42, wherein y' is the half-image height of the optical lens, and f is the focal length of the optical lens.
Further, the optical diaphragm is arranged between the sixth lens and the seventh lens.
Further, the optical lens further satisfies: TTL is less than or equal to 75.0mm, wherein TTL is the distance between the object side surface of the first lens and the imaging surface on the optical axis.
Further, the optical lens further satisfies: BFL >32.00mm, wherein BFL is the optical back focus of the optical lens.
The utility model has the advantages of that:
the utility model adopts eleven lenses and has large light transmission by correspondingly designing each lens; the resolution ratio is high, and the imaging quality is good; the working distance range is wide, and the device is suitable for various detection application places; the optical back focal length can be simultaneously adapted to various industrial camera interfaces, and the practicability is high.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used 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 for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a first embodiment of the present invention;
FIG. 2 is a graph of MTF at the 425-675nm band according to one embodiment of the present invention;
fig. 3 is a vertical axis chromatic aberration curve diagram according to a first embodiment of the present invention;
fig. 4 is a graph showing curvature of field and distortion according to the first embodiment of the present invention;
fig. 5 is a schematic structural view of a second embodiment of the present invention;
FIG. 6 is a MTF chart at the wavelength band of 425-675nm according to the second embodiment of the present invention;
fig. 7 is a vertical axis color difference graph according to a second embodiment of the present invention;
fig. 8 is a graph showing curvature of field and distortion according to a second embodiment of the present invention;
fig. 9 is a schematic structural diagram of a third embodiment of the present invention;
FIG. 10 is a MTF chart of the third embodiment of the present invention at the wavelength band of 425-675 nm;
fig. 11 is a vertical axis color difference graph of a third embodiment of the present invention;
fig. 12 is a graph showing curvature of field and distortion according to a third embodiment of the present invention;
fig. 13 is a schematic structural diagram of a fourth embodiment of the present invention;
FIG. 14 is a graph of MTF at the wavelength band of 425-675nm in accordance with an embodiment of the present invention;
fig. 15 is a vertical axis chromatic aberration graph according to a fourth embodiment of the present invention;
fig. 16 is a graph showing curvature of field and distortion according to a fourth embodiment of the present invention.
Detailed Description
To further illustrate the various embodiments, the present invention provides the accompanying drawings. The accompanying drawings, which are incorporated in and constitute a part of this disclosure, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the embodiments. With these references, one of ordinary skill in the art will appreciate other possible embodiments and advantages of the present invention. Elements in the figures are not drawn to scale and like reference numerals are generally used to indicate like elements.
The present invention will now be further described with reference to the accompanying drawings and detailed description.
The term "a lens element having positive refractive index (or negative refractive index)" means that the paraxial refractive index of the lens element 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 determination of the surface shape of the lens can be performed by the judgment method of a person skilled in the art, i.e., by the sign of the curvature radius (abbreviated as R value). The R value can be commonly used in optical design software, such as Zemax or CodeV. The R value is also commonly found in lens data sheets (lens data sheets) of optical design software. Regarding the object side surface, when the R value is positive, the object side surface is judged to be a convex surface; and when the R value is negative, judging that the object side surface is a concave surface. On the contrary, regarding the image side surface, when the R value is positive, the image side surface is judged to be a concave surface; when the R value is negative, the image side surface is judged to be convex.
The utility model discloses an optical lens with large light transmission, which comprises a first lens to an eleventh lens from an object side to an image side along an optical axis in sequence; the first lens element to the eleventh lens element each include 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 element with positive refractive index has a convex object-side surface and a concave image-side surface; the second lens element with positive refractive index has a convex object-side surface and a concave image-side surface; the first lens and the second lens are used for collecting light rays at the front end, so that the effective caliber of the rear end lens is effectively compressed, and the material cost and the weight of the whole lens are reduced.
The third lens element with negative refractive index has a concave image-side surface; the fourth lens has positive refraction, 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 element with negative refractive index has a convex object-side surface and a concave image-side surface; the sixth lens element with positive refractive index has a convex object-side surface; the seventh lens element with negative refractive index has a concave image-side surface; the eighth lens element with positive refractive power has a convex object-side surface and a convex image-side surface; the ninth lens element has a negative refractive index, and the object-side surface of the ninth lens element is concave; the tenth lens element with positive refractive power has a convex object-side surface and a convex image-side surface; the eleventh lens element with negative refractive power has a concave object-side surface and a concave image-side surface; the optical lens has only the first lens element to the eleventh lens element with refractive index.
The utility model adopts eleven lenses and has large light transmission by correspondingly designing each lens; the resolution ratio is high, and the imaging quality is good; the working distance range is wide, and the device is suitable for various detection application places; the optical back focal length can be simultaneously adapted to various industrial camera interfaces such as an F interface, a C interface and the like, and the practicability is high.
Preferably, the third lens and the fourth lens are mutually cemented, and the tenth lens and the eleventh lens are mutually cemented, so that the imaging quality of the optical lens is further improved, and the manufacturing difficulty is reduced.
More preferably, the optical lens further satisfies: 1.0 and fU1/f < -0.4 and 1.0 and fU2/f <1.5, wherein f is the focal length of the optical lens, fU1 is the combined focal length of the third lens and the fourth lens, and fU2 is the combined focal length of the tenth lens and the eleventh lens, can effectively and better eliminate aberrations of spherical aberration, astigmatism and the like, and improve image quality.
Preferably, the fifth lens and the sixth lens are mutually cemented, and the seventh lens, the eighth lens and the ninth lens are mutually cemented in sequence, so that the imaging quality of the optical lens is further improved, and the manufacturing difficulty is reduced.
More preferably, the optical lens further satisfies: -0.8 and f8/f7< -0.6 and 0.5 and f8/f9< -0.2, wherein f7, f8 and f9 are the focal lengths of the seventh lens, the eighth lens and the ninth lens respectively, and have great improvement effect on the chromatic aberration correction capability of the whole lens.
Preferably, the optical lens further satisfies: nd7 is more than 1.90, wherein nd7 is the refractive index of the seventh lens, the off-axis high-order aberration introduced by the front-end optical part can be effectively reduced, the vertical axis chromatic aberration of the optical lens can be effectively reduced, and the whole vertical axis chromatic aberration convergence of the optical lens is within 2 times of the pixel size.
Preferably, the optical lens further satisfies: y '/f >0.42, wherein y' is the half-image height of the optical lens, and f is the focal length of the optical lens, so that the requirements of the conventional industrial detection or machine vision field are better met.
Preferably, the optical diaphragm is arranged between the sixth lens and the seventh lens, so that the overall performance is further improved.
Preferably, the optical lens further satisfies: TTL is less than or equal to 75.0mm, wherein TTL is the distance between the object side surface of the first lens and the imaging surface on the optical axis, and the optical lens is short.
Preferably, the optical lens further satisfies: BFL >32.00mm, wherein BFL is the optics back focal of this optical lens, can the multiple industry camera interface of adaptation simultaneously, and the practicality is strong.
The optical lens with large light flux of the present invention will be described in detail with specific embodiments.
Example one
As shown in fig. 1, the optical lens with large light transmittance includes, in order along an optical axis I from an object side A1 to an image side A2, a first lens 1, a second lens 2, a third lens 3, a fourth lens 4, a fifth lens 5, a sixth lens 6, a stop 120, a seventh lens 7, an eighth lens 8, a ninth lens 9, a tenth lens 100, an eleventh lens 110, and an image plane 130; the first lens element 1 to the eleventh lens element 110 each include 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 positive refractive index, and 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 positive refractive index, and 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 index, and the object-side surface 31 of the third lens element 3 is concave, but the invention is not limited thereto, and the image-side surface 32 of the third lens element 3 is concave.
The fourth lens element 4 has positive power, the object-side surface 41 of the fourth lens element 4 is convex, and the image-side surface 42 of the fourth lens element 4 is concave.
The fifth lens element 5 has a negative refractive index, and 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 concave.
The sixth lens element 6 has a positive refractive index, and the object-side surface 61 of the sixth lens element 6 is convex, and the image-side surface 62 of the sixth lens element 6 is convex, but the invention is not limited thereto.
The seventh lens element 7 has a negative refractive index, and the object-side surface 71 of the seventh lens element 7 is a convex surface, but not limited thereto, and the image-side surface 72 of the seventh lens element 7 is a concave surface.
The eighth lens element 8 has a positive refractive index, and 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 convex.
The ninth lens element 9 has a negative refractive index, and the object-side surface 91 of the ninth lens element 9 is concave and the image-side surface 92 of the ninth lens element 9 is convex, but not limited thereto.
The tenth lens element 100 with positive refractive power has a convex object-side surface 101 of the tenth lens element 100 and a convex image-side surface 102 of the tenth lens element 100.
The eleventh lens element 110 has a negative refractive index, and an object-side surface 111 of the eleventh lens element 110 is concave and an image-side surface 112 of the eleventh lens element 110 is concave.
The image-side surface 32 of the third lens element 3 and the object-side surface 41 of the fourth lens element 4 are cemented to each other, the image-side surface 52 of the fifth lens element 5 and the object-side surface 61 of the sixth lens element 6 are cemented to each other, the image-side surface 72 of the seventh lens element 7 and the object-side surface 81 of the eighth lens element 8 are cemented to each other, 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 to each other, and the image-side surface 102 of the tenth lens element 100 and the object-side surface 111 of the eleventh lens element 110 are cemented to each other.
In this embodiment, the diaphragm 120 is disposed between the sixth lens 6 and the seventh lens 7, the aperture of the diaphragm 120 is a circular aperture, and the aperture of the diaphragm 120 is adjustable within a range from F2.2 to F16, but the invention is not limited thereto, and in other embodiments, the diaphragm 120 may be disposed at other suitable positions.
In the present embodiment, the first lens 1 to the eleventh lens 110 may be made of a glass material, but is not limited thereto.
The detailed optical data of this embodiment are shown in Table 1-1.
TABLE 1-1 detailed optical data for example one
| Surface of | Caliber size/mm | Radius of curvature/mm | Thickness/spacing/mm | Refractive index | Coefficient of dispersion | Focal length/mm | |
| - | Shot object surface | Infinity | - | ||||
| 11 | First lens | 30.99 | 43.65 | 3.44 | 1.88 | 40.9 | 121.6 |
| 12 | 29.37 | 70.74 | 0.25 | ||||
| 21 | Second lens | 26.88 | 26.90 | 4.70 | 1.75 | 52.3 | 54.7 |
| 22 | 24.47 | 71.18 | 1.52 | ||||
| 31 | Third lens | 23.97 | -353.71 | 1.77 | 1.67 | 32.2 | -19.0 |
| 32 | 18.76 | 13.35 | 0 | ||||
| 41 | Fourth lens | 18.76 | 13.35 | 4.37 | 1.74 | 44.9 | 37.6 |
| 42 | 16.74 | 21.97 | 1.80 | ||||
| 51 | Fifth lens element | 16.44 | 241.41 | 1.77 | 2.00 | 25.4 | -16.3 |
| 52 | 16.05 | 15.223 | 0 | ||||
| 61 | Sixth lens element | 16.05 | 15.223 | 4.64 | 1.95 | 17.9 | 15.9 |
| 62 | 15.99 | -1182.32 | 0.62 | ||||
| 120 | Diaphragm | 15.95 | Infinity | 1.77 | |||
| 71 | Seventh lens element | 16.21 | 85.91 | 1.81 | 1.92 | 18.9 | -20.6 |
| 72 | 16.18 | 15.45 | 0 | ||||
| 81 | Eighth lens element | 16.18 | 15.45 | 5.43 | 1.75 | 52.3 | 14.9 |
| 82 | 16.40 | -34.95 | 0 | ||||
| 91 | Ninth lens | 16.40 | -34.95 | 1.84 | 1.73 | 28.3 | -57.7 |
| 92 | 16.65 | -210.00 | 0.25 | ||||
| 101 | Tenth lens | 16.87 | 33.35 | 4.88 | 2.00 | 25.4 | 18.2 |
| 102 | 17.18 | -37.45 | 0 | ||||
| 111 | Eleventh lens element | 17.18 | -37.45 | 1.77 | 1.58 | 41.5 | -24.0 |
| 112 | 17.77 | 22.26 | 32.38 | ||||
| 130 | Image plane | 44.06 | Infinity |
Please refer to table 5 for the values of the conditional expressions related to this embodiment.
The MTF graph of this embodiment is detailed in fig. 2, and it can be seen that all the MTF graphs are greater than 0.4 under the condition of 40lp/mm, and have higher resolution; the vertical axis chromatic aberration diagram is shown in detail in figure 3, and it can be seen that the chromatic aberration correction is right and the imaging quality is high; the field curvature and distortion diagram are shown in (A) and (B) of FIG. 4, it can be seen that the aberrations such as field curvature and distortion are well corrected, and the optical distortion is within 1%.
In this embodiment, the focal length f =49.95mm of the optical lens; minimum aperture value FNO =2.2; the diameter of the image surface is 44.0mm; the distance TTL =75.0mm on the optical axis I from the object side surface 11 of the first lens element 1 to the image plane 130.
In the embodiment, the working distance range of the optical lens is from 0.3m to 2m, the adjustable range is large, and the optical lens is suitable for various detection application places.
Example two
As shown in fig. 5, in this embodiment, the surface type convexoconcave and the refractive index of each lens element are substantially the same as those of the first embodiment, only the image side surface 62 of the sixth lens element 6 is a flat surface, the image side surface 92 of the ninth lens element 9 is a flat surface, and optical parameters such as the curvature radius of each lens element surface and the lens thickness are different.
The detailed optical data of this embodiment is shown in Table 2-1.
TABLE 2-1 detailed optical data for example two
| Surface of | Caliber size/mm | Radius of curvature/mm | Thickness/spacing/mm | Refractive index | Coefficient of dispersion | Focal length/mm | |
| - | Shot object surface | Infinity | - | ||||
| 11 | First lens | 30.13 | 37.13 | 3.62 | 1.80 | 46.6 | 113.9 |
| 12 | 28.40 | 59.69 | 0.25 | ||||
| 21 | Second lens | 26.36 | 27.72 | 4.47 | 1.75 | 52.3 | 58.5 |
| 22 | 23.99 | 69.14 | 1.53 | ||||
| 31 | Third lens | 23.60 | -243.92 | 1.79 | 1.67 | 32.2 | -20.3 |
| 32 | 18.87 | 14.51 | 0 | ||||
| 41 | Fourth lens | 18.87 | 14.51 | 4.01 | 1.74 | 44.9 | 45.4 |
| 42 | 16.93 | 22.39 | 1.72 | ||||
| 51 | Fifth lens element | 16.66 | 138.19 | 1.78 | 2.00 | 25.4 | -18.4 |
| 52 | 16.45 | 16.210 | 0 | ||||
| 61 | Sixth lens element | 16.45 | 16.210 | 4.55 | 1.95 | 17.9 | 17.1 |
| 62 | 16.37 | Infinity | 0.65 | ||||
| 120 | Diaphragm | 16.33 | Infinity | 1.62 | |||
| 71 | Seventh lens element | 16.54 | 90.20 | 1.77 | 1.92 | 18.9 | -21.8 |
| 72 | 16.50 | 16.35 | 0 | ||||
| 81 | Eighth lens element | 16.50 | 16.35 | 5.78 | 1.75 | 52.3 | 14.1 |
| 82 | 16.70 | -25.82 | 0 | ||||
| 91 | Ninth lens | 16.70 | -25.82 | 1.77 | 1.64 | 34.5 | -40.3 |
| 92 | 16.87 | Infinity | 0.25 | ||||
| 101 | Tenth lens | 17.04 | 33.63 | 4.39 | 2.00 | 25.4 | 18.8 |
| 102 | 16.83 | -40.33 | 0 | ||||
| 111 | Eleventh lens element | 16.83 | -40.33 | 1.80 | 1.60 | 39.2 | -24.6 |
| 112 | 17.43 | 23.45 | 33.25 | ||||
| 130 | Image plane | 44.03 | Infinity |
Please refer to table 5 for the values of the conditional expressions related to this embodiment.
The MTF graph of this embodiment is detailed in fig. 6, and it can be seen that all the MTF graphs are greater than 0.4 under the condition of 40lp/mm, and have higher resolution; the vertical axis chromatic aberration diagram is detailed in fig. 7, and it can be seen that the chromatic aberration correction is correct and the imaging quality is high; the field curvature and distortion diagram are shown in (A) and (B) of FIG. 8, it can be seen that the aberrations such as field curvature and distortion are better corrected, and the optical distortion is within 1%.
In this embodiment, the focal length f =50.34mm of the optical lens; minimum aperture value FNO =2.2; the diameter of the image surface is 44.0mm; the distance TTL =75.0mm on the optical axis I from the object-side surface 11 of the first lens 1 to the imaging surface 130.
In the embodiment, the working distance range of the optical lens is from 0.3m to 2m, the adjustable range is large, and the optical lens is suitable for various detection application places.
EXAMPLE III
As shown in fig. 9, the lens elements of this embodiment have the same surface roughness and refractive index as those of the first embodiment, and only the optical parameters such as the curvature radius and the lens thickness of the surface of each lens element are different.
The detailed optical data of this embodiment is shown in Table 3-1.
TABLE 3-1 detailed optical data for EXAMPLE III
| Surface of | Caliber size/mm | Radius of curvature/mm | Thickness/spacing/mm | Refractive index | Coefficient of dispersion | Focal length/mm | |
| - | Shot object surface | Infinity | - | ||||
| 11 | First lens | 29.80 | 35.14 | 4.08 | 1.80 | 46.6 | 81.3 |
| 12 | 28.02 | 71.94 | 0.34 | ||||
| 21 | Second lens | 25.52 | 28.49 | 4.09 | 1.75 | 52.3 | 68.1 |
| 22 | 23.02 | 59.80 | 1.58 | ||||
| 31 | Third lens | 22.67 | -221.17 | 1.69 | 1.78 | 26.1 | -18.6 |
| 32 | 18.63 | 15.73 | 0 | ||||
| 41 | Fourth lens | 18.63 | 15.73 | 4.15 | 2.00 | 25.4 | 48.8 |
| 42 | 16.21 | 20.13 | 1.74 | ||||
| 51 | Fifth lens element | 16.14 | 126.23 | 1.69 | 2.00 | 25.4 | -18.1 |
| 52 | 16.13 | 15.802 | 0 | ||||
| 61 | Sixth lens element | 16.13 | 15.802 | 4.64 | 1.95 | 17.9 | 14.8 |
| 62 | 16.17 | -110.93 | 0.19 | ||||
| 120 | Diaphragm | 16.11 | Infinity | 1.28 | |||
| 71 | Seventh lens element | 16.21 | 110.13 | 1.69 | 1.92 | 18.9 | -20.7 |
| 72 | 16.17 | 16.18 | 0 | ||||
| 81 | Eighth lens element | 16.17 | 16.18 | 6.55 | 1.75 | 52.3 | 12.8 |
| 82 | 16.41 | -20.05 | 0 | ||||
| 91 | Ninth lens | 16.41 | -20.05 | 1.69 | 1.76 | 26.6 | -27.8 |
| 92 | 16.72 | -368.10 | 0.45 | ||||
| 101 | Tenth lens | 16.96 | 42.92 | 4.56 | 2.00 | 25.4 | 16.9 |
| 102 | 16.98 | -26.45 | 0 | ||||
| 111 | Eleventh lens element | 16.98 | -26.45 | 1.73 | 1.57 | 42.8 | -22.3 |
| 112 | 17.79 | 24.99 | 32.87 | ||||
| 130 | Image plane | 44.04 | Infinity |
Please refer to table 5 for the values of the conditional expressions related to this embodiment.
The MTF graph of this embodiment is detailed in fig. 10, and it can be seen that all the MTF graphs are greater than 0.4 under the condition of 40lp/mm, and have higher resolution; the vertical axis chromatic aberration diagram is shown in detail in fig. 11, and it can be seen that the chromatic aberration correction is correct and the imaging quality is high; the field curvature and distortion diagram are shown in (a) and (B) of fig. 12, it can be seen that the aberrations such as field curvature and distortion are better corrected, and the optical distortion is within 1%.
In this embodiment, the focal length f =49.62mm of the optical lens; minimum aperture value FNO =2.2; the diameter of the image surface is 44.0mm; the distance TTL =75.0mm on the optical axis I from the object-side surface 11 of the first lens 1 to the imaging surface 130.
In the embodiment, the working distance of the optical lens ranges from 0.3m to 2m, the adjustable range is large, and the optical lens is suitable for various detection application places.
Example four
As shown in fig. 13, in this embodiment, the surface convexities and concavities and refractive indexes of the lenses are substantially the same as those of the first embodiment, only the object-side surface 31 of the third lens element 3 is a convex surface, and the object-side surface 71 of the seventh lens element 7 is a concave surface, and the optical parameters such as the curvature radius of the lens surfaces and the lens thickness are different.
The detailed optical data of this embodiment is shown in Table 4-1.
TABLE 4-1 detailed optical data for example four
Please refer to table 5 for the values of the conditional expressions related to this embodiment.
The MTF graph of this embodiment is detailed in fig. 14, and it can be seen that all of them are greater than 0.4 under the condition of 40lp/mm, and have higher resolution; the vertical axis chromatic aberration diagram is detailed in fig. 15, and it can be seen that the chromatic aberration correction is correct and the imaging quality is high; the field curvature and distortion diagram are shown in detail in (a) and (B) of fig. 16, and it can be seen that aberrations such as field curvature and distortion are well corrected, and the optical distortion is within 0.7%.
In this embodiment, the focal length f =49.49mm of the optical lens; minimum aperture value FNO =2.2; the diameter of the image surface is 44.0mm; the distance TTL =75.0mm on the optical axis I from the object-side surface 11 of the first lens 1 to the imaging surface 130.
In the embodiment, the working distance range of the optical lens is from 0.3m to 2m, the adjustable range is large, and the optical lens is suitable for various detection application places.
Table 5 values of relevant important parameters of four embodiments of the present invention
| Example one | Example two | EXAMPLE III | Example four | |
| fU1(mm) | -33.04 | -32.20 | -25.85 | -24.77 |
| fU2(mm) | 55.99 | 60.21 | 54.37 | 69.06 |
| y′(mm) | 22.0 | 22.0 | 22.0 | 22.0 |
| f(mm) | 49.95 | 50.34 | 49.62 | 49.49 |
| fU1/f | -0.66 | -0.64 | -0.52 | -0.50 |
| fU2/f | 1.12 | 1.20 | 1.10 | 1.40 |
| |y′/f| | 0.44 | 0.44 | 0.44 | 0.44 |
| f7(mm) | -20.6 | -21.8 | -20.7 | -12.7 |
| f8(mm) | 14.9 | 14.1 | 12.8 | 9.7 |
| f9(mm) | -57.7 | -40.3 | -27.8 | -22.2 |
| f8/f7 | -0.72 | -0.65 | -0.62 | -0.76 |
| f8/f9 | -0.26 | -0.35 | -0.46 | -0.44 |
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 detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. The optical lens with large light transmission comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens from an object side to an image side along an optical axis in sequence; the first lens, the second lens, the third lens and the fourth lens respectively comprise an object side surface which faces the object side and enables the imaging light to pass through and an image side surface which faces the image side and enables the imaging light to pass through; the method is characterized in that:
the first lens element with positive refractive index has a convex object-side surface and a concave image-side surface;
the second lens element with positive refractive index has a convex object-side surface and a concave image-side surface;
the third lens element with negative refractive index has a concave image-side surface;
the fourth lens has positive refraction, 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 element with negative refractive index has a convex object-side surface and a concave image-side surface;
the sixth lens element with positive refractive index has a convex object-side surface;
the seventh lens element with negative refractive index has a concave image-side surface;
the eighth lens element with a positive refractive index has a convex object-side surface and a convex image-side surface;
the ninth lens element has a negative refractive index, and the object-side surface of the ninth lens element is concave;
the tenth lens element with positive refractive power has a convex object-side surface and a convex image-side surface;
the eleventh lens element with negative refractive power has a concave object-side surface and a concave image-side surface;
the optical lens has only the first lens element to the eleventh lens element.
2. A large-pass optical lens unit as claimed in claim 1, characterized in that the third lens and the fourth lens are cemented to each other, and the tenth lens and the eleventh lens are cemented to each other.
3. A large-pass optical lens according to claim 2, characterized in that it further satisfies: -1.0 and n & ltu 1/f < -0.4 and 1.0 and n & ltu 2/f <1.5, wherein f is the focal length of the optical lens, fU1 is the combined focal length of the third lens and the fourth lens, and fU2 is the combined focal length of the tenth lens and the eleventh lens.
4. A large-pass optical lens unit as claimed in claim 1, characterized in that the fifth lens and the sixth lens are cemented to each other, and the seventh lens, the eighth lens and the ninth lens are cemented to each other in this order.
5. A large-pass optical lens according to claim 4, characterized in that it further satisfies: -0.8< -f8/f 7< -0.6, -0.5< -f8/f 9< -0.2, wherein f7, f8 and f9 are focal lengths of the seventh lens, the eighth lens and the ninth lens respectively.
6. A large-pass optical lens according to claim 4, characterized in that it further satisfies: nd7>1.90, where nd7 is the refractive index of the seventh lens.
7. A large-pass optical lens according to claim 1, characterized in that it further satisfies: and | y '/f | >0.42, wherein y' is the half-image height of the optical lens, and f is the focal length of the optical lens.
8. A large-pass optical lens according to claim 1, characterized by further comprising a diaphragm disposed between the sixth lens and the seventh lens.
9. A large-pass optical lens according to claim 1, characterized in that it further satisfies: TTL is less than or equal to 75.0mm, wherein TTL is the distance between the object side surface of the first lens and the imaging surface on the optical axis.
10. A large-pass optical lens according to claim 1, characterized in that it further satisfies: BFL >32.00mm, wherein BFL is the optical back focus of the optical lens.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221909800.1U CN218158513U (en) | 2022-07-21 | 2022-07-21 | Large-light-transmission optical lens |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221909800.1U CN218158513U (en) | 2022-07-21 | 2022-07-21 | Large-light-transmission optical lens |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218158513U true CN218158513U (en) | 2022-12-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221909800.1U Active CN218158513U (en) | 2022-07-21 | 2022-07-21 | Large-light-transmission optical lens |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218158513U (en) |
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2022
- 2022-07-21 CN CN202221909800.1U patent/CN218158513U/en active Active
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