CN114114648A - Wide-angle low-distortion line scanning lens - Google Patents
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Abstract
The invention discloses a wide-angle low-distortion line-scanning lens which comprises first to sixth lenses, a diaphragm and seventh to fifteenth lenses, wherein the first lens, the sixth lens, the seventh lens, the ninth lens, the tenth lens, the twelfth lens, the thirteenth lens and the fifteenth lens are sequentially arranged from an object side to an image side along an optical axis and have positive diopter, and the second lens, the third lens, the fourth lens, the fifth lens, the eighth lens, the eleventh lens and the fourteenth lens have negative diopter. The wide-angle low-distortion line-scan lens has high resolution, and when the resolution is 130lp/mm, the full-field transfer function image is still larger than 0.3 and can be matched with a 3.5 mu m 4K camera; the maximum optical distortion of the full field of view of the lens is lower than 5%, and the high measurement accuracy can be still ensured when the lens is in a large angle; meanwhile, the whole system is optimized without heating, the focusing is carried out at normal temperature, the high temperature and the low temperature are not defocused, and the image quality is effectively ensured; in addition, the lens image plane phi is 14.36mm, the angle 2W is 115 degrees, the requirement of a larger view field can be met, and the application range is wide.
Description
Technical Field
The invention relates to the technical field of optical lenses, in particular to a wide-angle low-distortion line scanning lens.
Background
With the rapid development of industrial automation, machine vision demands are getting larger and larger, and the linear scanning lens is widely applied to various industry fields, such as production and manufacturing, quality detection, logistics, medicine, scientific research and the like, and the requirements on optical distortion, visual field size, image plane size and the like of the linear scanning lens are getting higher and higher, particularly, some wide-angle linear scanning lenses require both large-angle large image plane and small optical distortion. However, the conventional linear scanning lens generally has the condition that optical distortion, field angle, image plane and working distance cannot be simultaneously considered, so that the condition that one lens is lost is often found in production application: when the angle meets the detection requirement, the measurement accuracy can only be reduced due to overlarge optical distortion; when the optical distortion meets the requirement, the angle is often relatively small, and the optical distortion can be completed only by adding a camera and a lens, so that the production cost is increased. Therefore, the research and development of the wide-angle low-distortion line scanning lens is more urgent.
In view of the above, the inventors of the present application invented a wide-angle low-distortion line-scan lens.
Disclosure of Invention
The invention aims to provide a wide-angle low-distortion line scanning lens which has large wide angle, low distortion and large imaging surface and can effectively ensure high and low temperature imaging quality.
In order to achieve the purpose, the invention adopts the following technical scheme: a wide-angle low-distortion line-scanning lens comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens, a tenth lens, an eleventh lens, a twelfth lens, a thirteenth lens, a fourteenth lens and a fifteenth lens which are sequentially arranged along an optical axis from an object side to an image side, wherein the first lens to the fifteenth lens respectively comprise an object side surface facing the object side and allowing imaging light rays to pass and an image side surface facing the image side and allowing the imaging light rays to pass;
the first lens has positive diopter, 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 diopter, and 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 diopter, and the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a concave surface;
the fourth lens has negative diopter, and 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 negative diopter, the object side surface of the fifth lens is a concave surface, and the image side surface of the fifth lens is a concave surface;
the sixth lens has positive diopter, and the object side surface of the sixth lens is a convex surface, and the image side surface of the sixth lens is a convex surface;
the seventh lens has positive diopter, and the object side surface of the seventh lens is a concave surface, and the image side surface of the seventh lens is a convex surface;
the eighth lens has negative diopter, and the object side surface of the eighth lens is a concave surface, and the image side surface of the eighth lens is a convex surface;
the ninth lens has positive diopter, and the object side surface of the ninth lens is a convex surface, and the image side surface of the ninth lens is a convex surface;
the tenth lens has positive diopter, and the object side surface of the tenth lens is a convex surface, and the image side surface of the tenth lens is a convex surface;
the eleventh lens has negative diopter, the object side surface of the eleventh lens is a concave surface, and the image side surface of the eleventh lens is a concave surface;
the twelfth lens has positive diopter, and the object side surface of the twelfth lens is a convex surface, and the image side surface of the twelfth lens is a convex surface;
the thirteenth lens has positive diopter, and 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 fourteenth lens has negative diopter, and the object side surface of the fourteenth lens is a concave surface, and the image side surface of the fourteenth lens is a convex surface;
the fifteenth lens has a positive diopter, and an object side surface of the fifteenth lens is a convex surface, and an image side surface of the fifteenth lens is a concave surface.
Further, the first lens is a crescent lens, and satisfies: nd1 is more than or equal to 1.8, wherein nd1 is the refractive index of the first lens.
Further, second lens, third lens, fourth lens are crescent lens, and satisfy: 6< | f2/f | <7.3, 3< | f3/f | <4.2, 3< | f4/f | <4.6, wherein f is a focal length of the lens, f2 is a focal length of the second lens, f3 is a focal length of the third lens, and f4 is a focal length of the fourth lens.
Further, the refractive indexes of the first lens, the fifth lens, the seventh lens and the eighth lens are all larger than 1.8.
Further, the fifteenth lens satisfies: nd15 is more than or equal to 1.75, wherein nd15 is the refractive index of the fifteenth lens.
Further, an image-side surface of the seventh lens element is cemented with an object-side surface of the eighth lens element, an image-side surface of the eleventh lens element is cemented with an object-side surface of the twelfth lens element, and an image-side surface of the thirteenth lens element is cemented with an object-side surface of the fourteenth lens element.
Further, the lens satisfies: 10< | fg1/f | <12.5, 100< | fg2/f | <350, wherein fg1 is the combined focal length of the eleventh lens and the twelfth lens, and fg2 is the combined focal length of the thirteenth lens and the fourteenth lens.
Further, the lens satisfies: vd11 is not more than 24, Vd12 is not less than 63, | Vd12-Vd11| >38, Vd13 is not less than 48, Vd14 is not more than 22, | Vd13-Vd14| >26, wherein Vd11, Vd12, Vd13 and Vd14 are respectively the dispersion coefficients of the eleventh lens, the twelfth lens, the thirteenth lens and the fourteenth lens.
Furthermore, the refractive index temperature coefficients dn/dt of the ninth lens, the tenth lens and the twelfth lens are all negative values, the refractive index temperature coefficients dn/dt of the fourth lens, the fifth lens, the eighth lens, the eleventh lens and the fourteenth lens are all positive values, the variation of the back focal length of the lens caused by the temperature variation of the combination of the fourth lens, the fifth lens, the eighth lens, the ninth lens, the tenth lens and the twelfth lens is defined as delta BFL1,
the temperature coefficient dn/dt of the refractive index of the first lens, the sixth lens, the seventh lens, the thirteenth lens and the fifteenth lens is all positive, the variation of the back focal length of the lens caused by the temperature variation of the combination of the first lens, the sixth lens, the seventh lens, the thirteenth lens and the fifteenth lens is defined as delta BFL2,
wherein, the delta BFL1+ delta BFL2 is more than 0.
Furthermore, the variation of the back focal length of the lens caused by the lens refractive index, the lens R value, the lens core thickness and the air space between the lenses due to the temperature variation is defined as delta BFL3,
the lens is matched and assembled on a lens seat of the camera, the amount of change of the back focus of the lens caused by the temperature change of the lens seat is defined as delta BFL4,
wherein, Δ BFL 3- Δ BFL4 ═ 0.
After the technical scheme is adopted, the invention has the following advantages:
the wide-angle low-distortion line-scan lens has high resolution, and when the resolution is 130lp/mm, the full-field transfer function image is still larger than 0.3 and can be matched with a 3.5 mu m 4K camera; the maximum optical distortion of the full field of view of the lens is lower than 5%, and the high measurement accuracy can be still ensured when the lens is in a large angle; meanwhile, the whole system is optimized without heating, the focusing is carried out at normal temperature, the high temperature and the low temperature are not defocused, and the image quality is effectively ensured; in addition, the lens image plane phi is 14.36mm, the angle 2W is 115 degrees, the requirement of a larger view field can be met, and the application range is wide.
Drawings
FIG. 1 is a light path diagram of embodiment 1 of the present invention;
fig. 2 is a graph of MTF under visible light of the lens in embodiment 1 of the present invention;
fig. 3 is a field curvature and distortion diagram of a lens under visible light in embodiment 1 of the present invention;
FIG. 4 is a light path diagram of embodiment 2 of the present invention;
fig. 5 is a graph of MTF under visible light of the lens in embodiment 2 of the present invention;
fig. 6 is a field curvature and distortion diagram of a lens under visible light in embodiment 2 of the present invention;
FIG. 7 is a light path diagram of embodiment 3 of the present invention;
fig. 8 is a graph of MTF under visible light for a lens in embodiment 3 of the present invention;
fig. 9 is a field curvature and distortion diagram of a lens under visible light according to embodiment 3 of the present invention;
FIG. 10 is a light path diagram of embodiment 4 of the present invention;
fig. 11 is a graph of MTF under visible light for a lens in embodiment 4 of the present invention;
fig. 12 is a field curvature and distortion diagram of a lens under visible light in embodiment 4 of the present invention.
Description of reference numerals:
1. a first lens; 2. a second lens; 3. a third lens; 4. a fourth lens; 5. a fifth lens; 6. a sixth lens; 7. a seventh lens; 8. an eighth lens; 9. a ninth lens; 10. a tenth lens; 11. an eleventh lens; 12. a twelfth lens; 13. a thirteenth lens; 14. a fourteenth lens; 15. a fifteenth lens element; 16. a diaphragm; 17. and (4) protecting the sheet.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In the present invention, it should be noted that the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are all based on the orientation or positional relationship shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the apparatus or element of the present invention must have a specific orientation, and thus, should not be construed as limiting the present invention.
As used herein, the term "a lens element having a positive refractive index (or a negative refractive index)" means that the paraxial refractive index of the lens element calculated by Gaussian optics 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 may 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. When the R value is positive, the object side 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 invention discloses a wide-angle low-distortion line-scanning lens, which comprises 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 diaphragm 16, a seventh lens 7, an eighth lens 8, a ninth lens 9, a tenth lens 10, an eleventh lens 11, a twelfth lens 12, a thirteenth lens 13, a fourteenth lens and a fifteenth lens 15 which are sequentially arranged from an object side to an image side along an optical axis, wherein the first lens 1 to the fifteenth lens 15 respectively comprise an object side surface facing the object side and allowing imaging light rays to pass and an image side surface facing the image side and allowing the imaging light rays to pass;
the first lens 1 has positive diopter, and the object side surface of the first lens 1 is a convex surface, and the image side surface is a concave surface;
the second lens element 2 has negative diopter, and the object-side surface of the second lens element 2 is a convex surface and the image-side surface is a concave surface;
the third lens 3 has negative diopter, and the object side surface of the third lens 3 is a convex surface, and the image side surface is a concave surface;
the fourth lens 4 has negative diopter, and the object side surface of the fourth lens 4 is a convex surface, and the image side surface is a concave surface;
the fifth lens 5 has negative diopter, and the object side surface of the fifth lens 5 is a concave surface, and the image side surface is a concave surface;
the sixth lens element 6 has a positive refractive power, and an object-side surface of the sixth lens element 6 is a convex surface and an image-side surface thereof is a convex surface;
the seventh lens element 7 has a positive refractive power, and the object-side surface of the seventh lens element 7 is a concave surface and the image-side surface is a convex surface;
the eighth lens element 8 has negative refractive power, and the object-side surface of the eighth lens element 8 is a concave surface and the image-side surface is a convex surface;
the ninth lens element 9 has positive diopter, and an object-side surface of the ninth lens element 9 is a convex surface and an image-side surface thereof is a convex surface;
the tenth lens element 10 has a positive refractive power, and an object-side surface of the tenth lens element 10 is a convex surface and an image-side surface thereof is a convex surface;
the eleventh lens element 11 has a negative refractive power, and an object-side surface of the eleventh lens element 11 is a concave surface and an image-side surface thereof is a concave surface;
the twelfth lens element 12 has positive refractive power, and an object-side surface of the twelfth lens element 12 is a convex surface and an image-side surface thereof is a convex surface;
the thirteenth lens element 13 has a positive refractive power, and an object-side surface of the thirteenth lens element 13 is a convex surface and an image-side surface thereof is a convex surface;
the fourteenth lens element 14 has negative refractive power, and an object-side surface of the fourteenth lens element 14 is a concave surface and an image-side surface thereof is a convex surface;
the fifteenth lens element 15 has a positive refractive power, and an object-side surface of the fifteenth lens element 15 is a convex surface and an image-side surface thereof is a concave surface.
Wherein, the image side surface of the seventh lens 7 is cemented with the object side surface of the eighth lens 8, the image side surface of the eleventh lens 11 is cemented with the object side surface of the twelfth lens 12, and the image side surface of the thirteenth lens 13 is cemented with the object side surface of the fourteenth lens 14.
The lens uses fifteen lenses to form an imaging system, the imaging system is divided into three groups of cemented sheets and nine single lenses, a structure of front 6 and rear 9 is adopted, and a diaphragm 16 is arranged between a sixth lens 6 and a seventh lens 7 and used for converging front and rear light rays and reducing the aperture of the front and rear lens groups. Of course, the diaphragm 16 may be disposed at other positions according to actual needs.
The cemented combined lens is adopted behind the diaphragm 16, so that aberration can be eliminated better, the system performance is improved, the cemented combined lens is achromatic, the tolerance sensitivity is reduced, partial chromatic aberration can be remained to balance the chromatic aberration of the optical system, and the tolerance sensitivity problems of inclination/decentration and the like of the lens in the assembling process can be reduced.
Wherein, first lens 1 is crescent lens, and satisfies: nd1 is more than or equal to 1.8, wherein nd1 is the refractive index of the first lens 1. Therefore, the requirement of the lens for larger angle can be met, the outer diameter of the lens is effectively reduced, and the size of the whole optical system is smaller.
The refractive indexes of the first lens 1 to the fifth lens 5, the seventh lens 7 and the eighth lens 8 are all larger than 1.8. The lenses are made of high-refractive-index materials, so that the turning angle of light rays at the edge of the central view field is reduced, the sensitivity of the central view field is reduced, the field curvature can be optimized, and the image quality is improved.
The ninth lens 9 and the tenth lens 10 adopt positive diopter, and low dispersion materials such as H-FK61 are used for obtaining a larger effect on the second-order spectrum, so that the image quality can be effectively improved.
Between the tenth lens 10 and the eleventh lens 11, the tenth lens 10 with positive focal power is in front, and the eleventh lens 11 with negative focal power is behind, so that the light passing through the tenth lens 10 can be further smoothly transited to the eleventh lens 11, which is beneficial to reducing the optical path of the rear light. The light rays can be collected by the fifteenth lens 15 having positive optical power, reducing the rear end aperture/size of the lens.
The tenth lens 10, the twelfth lens 12, the thirteenth lens 13, and the fifteenth lens 15 are all lenses having positive optical power, and light can be collected by these lenses having positive optical power. The fifteenth lens 15 is made of a high-refraction material, and the refractive index nd15 of the fifteenth lens 15 is greater than or equal to 1.75, so that the diameter/size of a rear port of the lens can be effectively reduced, a C interface can still be used under the condition of a large image plane, and the lens has universality.
The lens satisfies the following conditions: 10< | fg1/f | <12.5, 100< | fg2/f | <350, where fg1 is the combined focal length of the eleventh lens element 11 and the twelfth lens element 12, and fg2 is the combined focal length of the thirteenth lens element 13 and the fourteenth lens element 14.
The lens satisfies the following conditions: vd11 is not more than 24, Vd12 is not less than 63, | Vd12-Vd11| >38, Vd13 is not less than 48, Vd14 is not more than 22, | Vd13-Vd14| >26, wherein Vd11, Vd12, Vd13 and Vd14 are respectively the dispersion coefficients of the eleventh lens 11, the twelfth lens 12, the thirteenth lens 13 and the fourteenth lens 14. The cemented lens is combined by high-low dispersion material lenses, which is beneficial to correcting chromatic aberration, optimizing image quality and improving system performance.
The focal power of the ninth lens 9, the tenth lens 10 and the twelfth lens 12 is a positive value, and the refractive index temperature coefficient dn/dt is a negative value, the focal power of the fourth lens 4, the fifth lens 5, the eighth lens 8, the eleventh lens 11 and the fourteenth lens 14 is a negative value, and the refractive index temperature coefficient dn/dt is a positive value, and the variation of the back focal length of the lens caused by the temperature variation of the combination of the fourth lens 4, the fifth lens 5, the eighth lens 8, the ninth lens 9, the tenth lens 10 and the twelfth lens 12 is defined as Δ BFL1, specifically, when the temperature increases, BFL1>0, and when the temperature decreases, Δ BFL1 is < 0. The temperature coefficient dn/dt of the refractive index of the first lens 1, the sixth lens 6, the seventh lens 7, the thirteenth lens 13, and the fifteenth lens 15 is all positive, and the amount of change of the back focal length of the lens caused by the temperature change of the combination of the first lens 1, the sixth lens 6, the seventh lens 7, the thirteenth lens 13, and the fifteenth lens 15 is defined as Δ BFL2, specifically, Δ BFL2<0 when the temperature is increased, and BFL2>0 when the temperature is decreased, and the following conditions are satisfied: Δ BFL1+ Δ BFL2> 0.
The variation of back focal length of the lens caused by the lens refractive index, the lens R value, the lens core thickness and the air space between the lenses due to temperature change is defined as delta BFL3, specifically, when the temperature is increased, the BFL3 is greater than 0, and when the temperature is reduced, the delta BFL3 is less than 0. The lens is matched and assembled on a lens seat of a camera, the lens is subjected to temperature change of the lens seat to cause the change amount of a back focal length to be defined as delta BFL4, specifically, when the temperature is increased, the BFL4>0, when the temperature is reduced, the delta BFL4<0, and the lens is always satisfied in high and low temperature environments: Δ BFL 3- Δ BFL4 ═ 0. If the high and low temperatures satisfy the relation, the lens and the camera are non-heating systems, i.e. under the conditions of normal temperature and high and low temperatures, the imaging system is clear and not out of focus.
The space ring between the lenses and the lens seat are both made of aluminum materials with the linear expansion coefficient of 23.6E-06, which is beneficial to realizing that delta BFL 3-delta BFL4 is 0. The process difficulty is reduced.
The mini infrared imaging lens of the present invention will be described in detail with specific embodiments.
Example 1
Referring to fig. 1, the present invention discloses a wide-angle low-distortion line-scanning lens, including 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 diaphragm 16, a seventh lens 7, an eighth lens 8, a ninth lens 9, a tenth lens 10, an eleventh lens 11, a twelfth lens 12, a thirteenth lens 13, a fourteenth lens, and a fifteenth lens 15, wherein each of the first lens 1 to the fifteenth lens 15 includes an object-side surface facing an object side and allowing passage of imaging light, and an image-side surface facing an image side and allowing passage of imaging light;
the first lens 1 has positive diopter, and the object side surface of the first lens 1 is a convex surface, and the image side surface is a concave surface;
the second lens element 2 has negative diopter, and the object-side surface of the second lens element 2 is a convex surface and the image-side surface is a concave surface;
the third lens 3 has negative diopter, and the object side surface of the third lens 3 is a convex surface, and the image side surface is a concave surface;
the fourth lens 4 has negative diopter, and the object side surface of the fourth lens 4 is a convex surface, and the image side surface is a concave surface;
the fifth lens 5 has negative diopter, and the object side surface of the fifth lens 5 is a concave surface, and the image side surface is a concave surface;
the sixth lens element 6 has a positive refractive power, and an object-side surface of the sixth lens element 6 is a convex surface and an image-side surface thereof is a convex surface;
the seventh lens element 7 has a positive refractive power, and the object-side surface of the seventh lens element 7 is a concave surface and the image-side surface is a convex surface;
the eighth lens element 8 has negative refractive power, and the object-side surface of the eighth lens element 8 is a concave surface and the image-side surface is a convex surface;
the ninth lens element 9 has positive diopter, and an object-side surface of the ninth lens element 9 is a convex surface and an image-side surface thereof is a convex surface;
the tenth lens element 10 has a positive refractive power, and an object-side surface of the tenth lens element 10 is a convex surface and an image-side surface thereof is a convex surface;
the eleventh lens element 11 has a negative refractive power, and an object-side surface of the eleventh lens element 11 is a concave surface and an image-side surface thereof is a concave surface;
the twelfth lens element 12 has positive refractive power, and an object-side surface of the twelfth lens element 12 is a convex surface and an image-side surface thereof is a convex surface;
the thirteenth lens element 13 has a positive refractive power, and an object-side surface of the thirteenth lens element 13 is a convex surface and an image-side surface thereof is a convex surface;
the fourteenth lens element 14 has negative refractive power, and an object-side surface of the fourteenth lens element 14 is a concave surface and an image-side surface thereof is a convex surface;
the fifteenth lens element 15 has a positive refractive power, and an object-side surface of the fifteenth lens element 15 is a convex surface and an image-side surface thereof is a concave surface.
Wherein, the image side surface of the seventh lens 7 is cemented with the object side surface of the eighth lens 8, the image side surface of the eleventh lens 11 is cemented with the object side surface of the twelfth lens 12, and the image side surface of the thirteenth lens 13 is cemented with the object side surface of the fourteenth lens 14.
The detailed optical data of this embodiment are shown in Table 1-1.
Table 1-1 detailed optical data for example 1
In this embodiment, the values of some specific parameters are shown in tables 1-2.
Table 1-2 partial detailed parametric data for example 1
| f2 | f3 | f4 | fg1 | fg2 | f2/f | f3/f | f4/f | fg1/f | fg2/f |
| -31.7 | -17.5 | -18.6 | -54.5 | 1390.0 | -6.6 | -3.6 | -3.9 | -11.4 | 289.6 |
In this embodiment, please refer to fig. 2 for an MTF graph of the lens under visible light, and it can be seen from the graph that when the spatial frequency of the lens reaches 130lp/mm, the MTF value of the full field is greater than 0.3, the imaging quality is excellent, the resolution of the lens is high, and the lens can be matched with a 3.5 μm 4K camera. Please refer to fig. 3 for the field curvature and distortion diagram of the lens under visible light, it can be seen from the diagram that the optical distortion of the lens is < -5% |, the distortion is small, the wide-angle distortion is controlled, and the image quality is improved.
Example 2
As shown in fig. 4, this embodiment is different from embodiment 1 mainly in the optical parameters such as the curvature radius of each lens surface and the lens thickness.
The detailed optical data of this embodiment is shown in Table 2-1.
Table 2-1 detailed optical data for example 2
In this embodiment, the values of some specific parameters are shown in table 2-2.
Table 2-2 partial detailed parametric data for example 2
| f2 | f3 | f4 | fg1 | fg2 | f2/f | f3/f | f4/f | fg1/f | fg2/f |
| -32.5 | -17.7 | -18.5 | -54.8 | 553.3 | -6.8 | -3.7 | -3.8 | -11.4 | 115.3 |
In this embodiment, please refer to fig. 5 for an MTF graph of the lens under visible light, and it can be seen from the graph that when the spatial frequency of the lens reaches 130lp/mm, the MTF value of the full field is greater than 0.3, the imaging quality is excellent, the resolution of the lens is high, and the lens can be matched with a 3.5 μm 4K camera. Please refer to fig. 6 for the field curvature and distortion diagram of the lens under visible light, it can be seen from the diagram that the optical distortion of the lens is < -5% |, the distortion is small, the wide-angle distortion is controlled, and the image quality is improved.
Example 3
As shown in fig. 7, this embodiment is different from embodiment 1 mainly in the optical parameters such as the curvature radius of each lens surface and the lens thickness.
The detailed optical data of this embodiment is shown in Table 3-1.
Table 3-1 detailed optical data for example 3
In this embodiment, the values of some specific parameters are shown in table 3-2.
Table 3-2 partial detailed parametric data for example 3
| f2 | f3 | f4 | fg1 | fg2 | f2/f | f3/f | f4/f | fg1/f | fg2/f |
| -30.9 | -17.7 | -18.7 | -54.4 | 1376.4 | -6.4 | -3.7 | -3.9 | -11.3 | 286.8 |
In this embodiment, please refer to fig. 8 for an MTF graph of the lens under visible light, and it can be seen from the graph that when the spatial frequency of the lens reaches 130lp/mm, the MTF value of the full field is greater than 0.3, the imaging quality is excellent, the resolution of the lens is high, and the lens can be matched with a 3.5 μm 4K camera. Please refer to fig. 9 for the field curvature and distortion diagram of the lens under visible light, it can be seen from the diagram that the optical distortion of the lens is < -5% |, the distortion is small, the wide-angle distortion is controlled, and the image quality is improved.
Example 4
As shown in fig. 10, this embodiment is different from embodiment 1 mainly in the optical parameters such as the curvature radius of each lens surface and the lens thickness.
The detailed optical data of this embodiment is shown in Table 4-1.
Table 4-1 detailed optical data for example 4
| Surface of | Radius of curvature | Thickness of | Refractive index | Coefficient of dispersion | |
|
| 0 | Shot object surface | Infinity | 1200.0 | |||
| 1 | First lens | 43.7 | 9.0 | 1.9 | 31.3 | 103.2 |
| 2 | 72.5 | 0.2 | ||||
| 3 | Second lens | 23.5 | 1.5 | 2.0 | 25.4 | -30.7 |
| 4 | 12.5 | 5.1 | ||||
| 5 | Third lens | 22.1 | 1.5 | 1.9 | 17.9 | -17.6 |
| 6 | 9.1 | 4.2 | ||||
| 7 | Fourth lens | 32.1 | 1.7 | 1.8 | 37.3 | -18.4 |
| 8 | 9.9 | 3.1 | ||||
| 9 | Fifth lens element | -65.0 | 6.0 | 1.9 | 17.9 | -15.2 |
| 10 | 19.6 | 0.1 | ||||
| 11 | Sixth lens element | 15.0 | 8.0 | 1.7 | 33.9 | 13.2 |
| 12 | -15.7 | 7.3 | ||||
| 13 | Diaphragm | Infinity | 1.7 | |||
| 14 | Seventh lens element | Infinity | 7.5 | 1.8 | 23.8 | 6.8 |
| 15 | Eighth lens element | -5.7 | 6.8 | 1.9 | 39.2 | -7.0 |
| 16 | -136.3 | 1.1 | ||||
| 17 | Ninth lens | 42.1 | 6.4 | 1.5 | 70.4 | 42.3 |
| 18 | -38.6 | 1.2 | ||||
| 19 | Tenth lens | 23.4 | 6.6 | 1.5 | 90.3 | 26.0 |
| 20 | -22.1 | 0.1 | ||||
| 21 | Eleventh lens | -39.1 | 1.2 | 1.8 | 23.8 | -11.4 |
| 22 | Twelfth lens element | 13.1 | 6.5 | 1.6 | 65.5 | 16.4 |
| 23 | -33.2 | 0.1 | ||||
| 24 | Thirteenth lens | 53.3 | 6.3 | 1.7 | 49.2 | 15.1 |
| 25 | Fourteenth lens element | -12.7 | 1.2 | 1.9 | 20.9 | -14.6 |
| 26 | -150.1 | 0.8 | ||||
| 27 | Fifteenth lens element | 21.0 | 4.3 | 1.7 | 55.5 | 33.0 |
| 28 | 209.8 | 1.0 | ||||
| 29 | Protective sheet | Infinity | 1.8 | 1.5 | 64.2 | Infinity |
| 30 | Infinity | 6.7 | ||||
| 31 | Image plane | Infinity |
In this embodiment, the values of some specific parameters are shown in table 4-2.
Table 4-2 partial detailed parametric data for example 4
| f2 | f3 | f4 | fg1 | fg2 | f2/f | f3/f | f4/f | fg1/f | fg2/f |
| -30.7 | -17.6 | -18.4 | -51.3 | 988.0 | -6.4 | -3.7 | -3.8 | -10.7 | 205.8 |
In this embodiment, please refer to fig. 11 for an MTF graph of the lens under visible light, and it can be seen from the graph that when the spatial frequency of the lens reaches 130lp/mm, the MTF value of the full field is greater than 0.3, the imaging quality is excellent, the resolution of the lens is high, and the lens can be matched with a 3.5 μm 4K camera. Please refer to fig. 12 for the field curvature and distortion diagram of the lens under visible light, it can be seen from the diagram that the optical distortion of the lens is < -5% |, the distortion is small, the wide-angle distortion is controlled, and the image quality is improved.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. The utility model provides a low distortion line of wide angle sweeps camera lens which characterized in that: the zoom lens comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens, a tenth lens, an eleventh lens, a twelfth lens, a thirteenth lens, a fourteenth lens and a fifteenth lens which are sequentially arranged along an optical axis from an object side to an image side, wherein the first lens to the fifteenth lens respectively comprise an object side surface facing the object side and allowing imaging light rays to pass through and an image side surface facing the image side and allowing the imaging light rays to pass through;
the first lens has positive diopter, 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 diopter, and 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 diopter, and the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a concave surface;
the fourth lens has negative diopter, and 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 negative diopter, the object side surface of the fifth lens is a concave surface, and the image side surface of the fifth lens is a concave surface;
the sixth lens has positive diopter, and the object side surface of the sixth lens is a convex surface, and the image side surface of the sixth lens is a convex surface;
the seventh lens has positive diopter, and the object side surface of the seventh lens is a concave surface, and the image side surface of the seventh lens is a convex surface;
the eighth lens has negative diopter, and the object side surface of the eighth lens is a concave surface, and the image side surface of the eighth lens is a convex surface;
the ninth lens has positive diopter, and the object side surface of the ninth lens is a convex surface, and the image side surface of the ninth lens is a convex surface;
the tenth lens has positive diopter, and the object side surface of the tenth lens is a convex surface, and the image side surface of the tenth lens is a convex surface;
the eleventh lens has negative diopter, the object side surface of the eleventh lens is a concave surface, and the image side surface of the eleventh lens is a concave surface;
the twelfth lens has positive diopter, and the object side surface of the twelfth lens is a convex surface, and the image side surface of the twelfth lens is a convex surface;
the thirteenth lens has positive diopter, and 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 fourteenth lens has negative diopter, and the object side surface of the fourteenth lens is a concave surface, and the image side surface of the fourteenth lens is a convex surface;
the fifteenth lens has a positive diopter, and an object side surface of the fifteenth lens is a convex surface, and an image side surface of the fifteenth lens is a concave surface.
2. The wide-angle low-distortion line-scan lens of claim 1, wherein: first lens are crescent lens, and satisfy: nd1 is more than or equal to 1.8, wherein nd1 is the refractive index of the first lens.
3. The wide-angle low-distortion line-scan lens of claim 1, wherein: second lens, third lens, fourth lens are crescent lens, and satisfy: 6< | f2/f | <7.3, 3< | f3/f | <4.2, 3< | f4/f | <4.6, wherein f is a focal length of the lens, f2 is a focal length of the second lens, f3 is a focal length of the third lens, and f4 is a focal length of the fourth lens.
4. The wide-angle low-distortion line-scan lens of claim 1, wherein: the refractive indexes of the first lens, the fifth lens, the seventh lens and the eighth lens are all larger than 1.8.
5. The wide-angle low-distortion line-scan lens of claim 1, wherein: the fifteenth lens satisfies: nd15 is more than or equal to 1.75, wherein nd15 is the refractive index of the fifteenth lens.
6. The wide-angle low-distortion line-scan lens of claim 1, wherein: an image-side surface of the seventh lens element is cemented with an object-side surface of the eighth lens element, an image-side surface of the eleventh lens element is cemented with an object-side surface of the twelfth lens element, and an image-side surface of the thirteenth lens element is cemented with an object-side surface of the fourteenth lens element.
7. The wide-angle low-distortion line-scan lens of claim 6, wherein: the lens satisfies the following conditions: 10< | fg1/f | <12.5, 100< | fg2/f | <350, wherein fg1 is the combined focal length of the eleventh lens and the twelfth lens, and fg2 is the combined focal length of the thirteenth lens and the fourteenth lens.
8. The wide-angle low-distortion line-scan lens of claim 6, wherein: the lens satisfies the following conditions: vd11 is not more than 24, Vd12 is not less than 63, | Vd12-Vd11| >38, Vd13 is not less than 48, Vd14 is not more than 22, | Vd13-Vd14| >26, wherein Vd11, Vd12, Vd13 and Vd14 are respectively the dispersion coefficients of the eleventh lens, the twelfth lens, the thirteenth lens and the fourteenth lens.
9. The wide-angle low-distortion line-scan lens of claim 1, wherein: the refractive index temperature coefficients dn/dt of the ninth lens, the tenth lens and the twelfth lens are all negative values, the refractive index temperature coefficients dn/dt of the fourth lens, the fifth lens, the eighth lens, the eleventh lens and the fourteenth lens are all positive values, the variation of the back focal length of the lens caused by the temperature variation of the combination of the fourth lens, the fifth lens, the eighth lens, the ninth lens, the tenth lens and the twelfth lens is defined as delta BFL1,
the temperature coefficient dn/dt of the refractive index of the first lens, the sixth lens, the seventh lens, the thirteenth lens and the fifteenth lens is all positive, the variation of the back focal length of the lens caused by the temperature variation of the combination of the first lens, the sixth lens, the seventh lens, the thirteenth lens and the fifteenth lens is defined as delta BFL2,
wherein, the delta BFL1+ delta BFL2 is more than 0.
10. The wide-angle low-distortion line-scan lens of claim 1, wherein: the variation of the back focal length of the lens caused by the lens refractive index, the lens R value, the lens core thickness and the air space between the lenses due to the temperature variation is defined as delta BFL3,
the lens is matched and assembled on a lens seat of the camera, the amount of change of the back focus of the lens caused by the temperature change of the lens seat is defined as delta BFL4,
wherein, Δ BFL 3- Δ BFL4 ═ 0.
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| WO2024046737A1 (en) * | 2022-08-30 | 2024-03-07 | Hensoldt Optronics Gmbh | Wide-angle objective lens apparatus |
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