CN114114648B - Wide-angle low-distortion line scanning lens - Google Patents
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- CN114114648B CN114114648B CN202111652588.5A CN202111652588A CN114114648B CN 114114648 B CN114114648 B CN 114114648B CN 202111652588 A CN202111652588 A CN 202111652588A CN 114114648 B CN114114648 B CN 114114648B
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Abstract
The invention discloses a wide-angle low-distortion line scanning lens which comprises a first lens, a sixth lens, a diaphragm and a seventh lens, 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, the positive diopter is provided for 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, and the negative diopter is provided for the second lens, the third lens, the fourth lens, the fifth lens, the eighth lens, the eleventh lens and the fourteenth lens. The wide-angle low-distortion line scanning lens has higher resolution, and the full-view field transfer function image is still larger than 0.3 when 130lp/mm, so that the wide-angle low-distortion line scanning lens can be matched with a 3.5 mu m 4K camera; the maximum optical distortion of the whole field of view of the lens is lower than 5%, and the high accuracy of measurement can be ensured when the lens is at a large angle; meanwhile, the whole system is not optimized in a heating mode, is focused at normal temperature, is not out of focus at high and low temperatures, and effectively ensures the image quality; in addition, the image plane phi of the lens is 14.36mm, the angle is 2W to 115 degrees, the requirement of a larger field of view 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, the machine vision requirement is larger and larger, and the machine vision requirement is widely applied to various industrial fields, such as production and manufacturing, quality detection, logistics, medicine, scientific research and the like, and the requirements on optical distortion, field of view, image surface size and the like of the line scanning lens are higher and higher, and particularly, some wide-angle line scanning lenses are required to have large angle and large image surface and also have small optical distortion. However, the existing line scanning lens generally has the situation that optical distortion, a field angle, an image plane and a working distance cannot be considered simultaneously, so that the situation that the optical distortion, the field angle, the image plane and the working distance are out of phase often occurs in production application: when the angle meets the detection requirement, the optical distortion is overlarge, so that the measurement accuracy can only be reduced; when the optical distortion meets the requirement, the angle is relatively small, and the optical distortion can be finished only by adding a camera and a lens, so that the production cost is increased. The development of wide-angle low-distortion line scanning lenses is more urgent.
In view of this, the present inventors 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 a large wide angle, low distortion and a large imaging surface and can effectively ensure high-low temperature imaging quality.
In order to achieve the above purpose, the present invention adopts the following technical scheme: the 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 from an object side to an image side along an optical axis, wherein each of the first lens to the fifteenth lens comprises an object side surface which faces the object side and allows imaging light to pass through and an image side surface which faces the image side and allows the imaging light 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, 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, 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 element has negative refractive power, wherein the object-side surface of the fourth lens element is convex, and the image-side surface of the fourth lens element is concave;
The fifth lens element has negative refractive power, wherein the object-side surface of the fifth lens element is concave, and the image-side surface of the fifth lens element is concave;
the sixth lens element has positive refractive power, 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 diopter, 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 element has negative refractive power, wherein the object-side surface of the eighth lens element is concave, and the image-side surface of the eighth lens element is convex;
the ninth lens element has positive refractive power, wherein the object-side surface of the ninth lens element is convex, and the image-side surface of the ninth lens element is convex;
the tenth lens has positive diopter, 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 is a concave surface;
The twelfth lens element has positive refractive power, wherein the object-side surface of the twelfth lens element is convex, and the image-side surface of the twelfth lens element is convex;
The thirteenth lens element has positive refractive power, wherein the object-side surface of the thirteenth lens element is convex, and the image-side surface of the thirteenth lens element is convex;
the fourteenth lens element has negative refractive power, wherein the object-side surface of the fourteenth lens element is concave, and the image-side surface of the fourteenth lens element is convex;
The fifteenth lens element has positive refractive power, wherein the object-side surface of the fifteenth lens element is convex, and the image-side surface of the fifteenth lens element is concave.
Further, the first lens is a crescent lens, and satisfies: nd1 is larger than or equal to 1.8, wherein nd1 is the refractive index of the first lens.
Further, the second lens, the third lens and the fourth lens are crescent lenses, and the following conditions are satisfied: 6< |f2/f| <7.3,3< |f3/f| <4.2,3< |f4/f| <4.6, where f is the lens focal length, f2 is the focal length of the second lens, f3 is the focal length of the third lens, and f4 is the 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 not less than 1.75, wherein nd15 is the refractive index of the fifteenth lens.
Further, an image side of the seventh lens element is cemented with an object side of the eighth lens element, an image side of the eleventh lens element is cemented with an object side of the twelfth lens element, and an image side of the thirteenth lens element is cemented with an object side of the fourteenth lens element.
Further, the lens satisfies: 10< |fg 1/f| <12.5, 100< |fg 2/f| <350, where fg1 is the combined focal length of the eleventh and twelfth lenses and fg2 is the combined focal length of the thirteenth and fourteenth lenses.
Further, the lens satisfies: vd11 is less than or equal to 24, vd12 is more than or equal to 63, |Vd12-Vd11| >38, vd13 is more than or equal to 48, vd14 is less than or equal to 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.
Further, 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 change amount of the back focal length caused by the temperature change of the fourth lens, the fifth lens, the eighth lens, the ninth lens, the tenth lens and the twelfth lens combination is defined as delta BFL1,
The refractive index temperature coefficients dn/dt of the first lens, the sixth lens, the seventh lens, the thirteenth lens and the fifteenth lens are all positive values, the change amount of the back focal length of the lens caused by the temperature change of the first lens, the sixth lens, the seventh lens, the thirteenth lens and the fifteenth lens is defined as delta BFL2,
Wherein Δbfl1+Δbfl2 > 0.
Further, the amount of change in the lens barrel due to the change in the refractive index of the lens, the R value of the lens, the thickness of the lens core and the air space between the lenses due to the temperature change is defined as DeltaBFL 3,
The lens is assembled on the lens base of the camera in a matching way, the change amount of the back focal length caused by the temperature change of the lens base is defined as delta BFL4,
Wherein Δbfl3- Δbfl4=0.
After the technical scheme is adopted, the invention has the following advantages:
The wide-angle low-distortion line scanning lens has higher resolution, and the full-view field transfer function image is still larger than 0.3 when 130lp/mm, so that the wide-angle low-distortion line scanning lens can be matched with a 3.5 mu m 4K camera; the maximum optical distortion of the whole field of view of the lens is lower than 5%, and the high accuracy of measurement can be ensured when the lens is at a large angle; meanwhile, the whole system is not optimized in a heating mode, is focused at normal temperature, is not out of focus at high and low temperatures, and effectively ensures the image quality; in addition, the image plane phi of the lens is 14.36mm, the angle is 2W to 115 degrees, the requirement of a larger field of view 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 showing the MTF of the lens in example 1 of the present invention under visible light;
FIG. 3 is a graph showing curvature of field and distortion of a lens barrel 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 showing the MTF of the lens in example 2 of the present invention under visible light;
FIG. 6 is a graph showing curvature of field and distortion of a lens barrel 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 showing the MTF of the lens in example 3 of the present invention under visible light;
FIG. 9 is a graph showing curvature of field and distortion of a lens barrel under visible light in 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 showing the MTF of the lens in the visible light in example 4 of the present invention;
fig. 12 is a graph showing curvature of field and distortion of a lens barrel under visible light in embodiment 4 of the present invention.
Reference numerals illustrate:
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; 16. a diaphragm; 17. and a protective sheet.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
It should be noted that, in the present invention, 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 merely for convenience of describing the present invention and simplifying the description, and 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.
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 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 14 and a fifteenth lens 15 which are sequentially arranged from an object side to an image side along an optical axis, wherein each of the first lens 1 to the fifteenth lens 15 comprises an object side face which faces the object side and passes imaging light and an image side face which faces the image side and passes imaging light;
The first lens element 1 has positive refractive power, wherein an object-side surface of the first lens element 1 is convex, and an image-side surface of the first lens element 1 is concave;
the second lens element 2 has negative refractive power, wherein an object-side surface of the second lens element 2 is convex, and an image-side surface of the second lens element 2 is concave;
the third lens element 3 has negative refractive power, wherein an object-side surface of the third lens element 3 is convex, and an image-side surface of the third lens element 3 is concave;
the fourth lens element 4 has negative refractive power, wherein an object-side surface of the fourth lens element 4 is convex, and an image-side surface thereof is concave;
the fifth lens element 5 has negative refractive power, wherein an object-side surface of the fifth lens element 5 is a concave surface, and an image-side surface of the fifth lens element 5 is a concave surface;
the sixth lens element 6 has positive refractive power, wherein an object-side surface of the sixth lens element 6 is convex, and an image-side surface thereof is convex;
The seventh lens element 7 with positive refractive power has a concave object-side surface and a convex image-side surface;
the eighth lens element 8 with negative refractive power has a concave object-side surface and a convex image-side surface;
The ninth lens element 9 has positive refractive power, wherein an object-side surface of the ninth lens element 9 is convex, and an image-side surface thereof is convex;
The tenth lens element 10 has positive refractive power, wherein an object-side surface of the tenth lens element 10 is convex, and an image-side surface thereof is convex;
the eleventh lens element 11 has negative refractive power, wherein the object-side surface of the eleventh lens element 11 is concave, and the image-side surface is concave;
The twelfth lens element 12 has positive refractive power, wherein 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 positive refractive power, wherein 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 a negative refractive power, wherein an object-side surface of the fourteenth lens element 14 is concave, and an image-side surface thereof is convex;
the fifteenth lens element 15 has a positive refractive power, wherein an object-side surface of the fifteenth lens element 15 is convex, and an image-side surface thereof is concave.
Wherein the image side surface of the seventh lens element 7 is cemented with the object side surface of the eighth lens element 8, the image side surface of the eleventh lens element 11 is cemented with the object side surface of the twelfth lens element 12, and the image side surface of the thirteenth lens element 13 is cemented with the object side surface of the fourteenth lens element 14.
The lens comprises an imaging system by using fifteen lenses, is divided into three groups of glued sheets and nine single lenses, adopts a structure of front 6 and rear 9, and a diaphragm 16 is arranged between the sixth lens 6 and the seventh lens 7 and is used for converging front and rear rays and reducing the caliber of the front and rear lens groups. Of course, the diaphragm 16 may be disposed at other positions as needed.
The cemented lens is adopted after the diaphragm 16, so that aberration can be better eliminated, system performance is improved, achromatism of the cemented lens is improved, tolerance sensitivity is reduced, partial chromatic aberration can be remained to balance chromatic aberration of an optical system, and tolerance sensitivity problems of the lens due to inclination/eccentric core and the like in the assembling process can be reduced.
Wherein, the first lens 1 is a crescent lens, and satisfies: nd1 is equal to or greater than 1.8, wherein nd1 is the refractive index of the first lens 1. Therefore, the requirement of a larger angle of the lens can be met, the outer diameter of the lens is effectively reduced, and the whole optical system is smaller in size.
The second lens 2, the third lens 3 and the fourth lens 4 are crescent lenses, and the following conditions are satisfied: 6< |f2/f| <7.3,3< |f3/f| <4.2,3< |f4/f| <4.6, where f is the lens focal length, f2 is the focal length of the second lens 2, f3 is the focal length of the third lens 3, and f4 is the focal length of the fourth lens 4. The design can converge light, reduce the front end diameter of the lens, simultaneously better compress distortion and realize large-angle low distortion.
The refractive index of each of the first to fifth lenses 1 to 5, the seventh lens 7 and the eighth lens 8 is greater than 1.8. The lenses are made of high-refractive-index materials, which is beneficial to reducing the turning angle of the marginal light rays of the central view field, reducing the sensitivity of the central view field, optimizing the field curvature and improving the image quality.
The ninth lens 9 and the tenth lens 10 adopt positive diopter, and use low dispersion materials such as H-FK61 to take a larger effect on the cancellation secondary spectrum, so that the image quality can be effectively improved.
Wherein, 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 in back, 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 light behind. The rear lens port diameter/size can be reduced by converging light rays through the fifteenth lens 15 having positive optical power.
The tenth lens 10, the twelfth lens 12, the thirteenth lens 13, and the fifteenth lens 15 are lenses having positive optical power, and light rays can be condensed by the 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 more than or equal to 1.75, so that the rear end diameter/size of the lens can be effectively reduced, and a C interface can be still used under the condition of meeting a large image plane, and the lens has universality.
The lens satisfies the following conditions: 10< |fg 1/f| <12.5, 100< |fg 2/f| <350, where fg1 is the combined focal length of the eleventh and twelfth lenses 11, 12 and fg2 is the combined focal length of the thirteenth and fourteenth lenses 13, 14.
The lens satisfies the following conditions: vd11 is less than or equal to 24, vd12 is more than or equal to 63, |Vd12-Vd11| >38, vd13 is more than or equal to 48, vd14 is less than or equal to 22, |Vd13-Vd14| >26, wherein, vd11, vd12, vd13, 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 adopts the combination of high-low dispersion material lens, is favorable for correcting chromatic aberration, optimizes image quality and improves system performance.
The powers of the ninth lens 9, the tenth lens 10 and the twelfth lens 12 are positive values, the refractive index temperature coefficients dn/dt are negative values, the powers of the fourth lens 4, the fifth lens 5, the eighth lens 8, the eleventh lens 11 and the fourteenth lens 14 are negative values, the refractive index temperature coefficients dn/dt are positive values, the change amount of the back focal length caused by the temperature change 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 Δbfl1, specifically, when the temperature increases, BFL1>0, and when the temperature decreases, Δbfl1<0. The refractive index temperature coefficients dn/dt of the first lens 1, the sixth lens 6, the seventh lens 7, the thirteenth lens 13, and the fifteenth lens 15 are all positive values, and the change amount of the back focal length due to 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 Δbfl2, specifically, Δbfl2<0 when the temperature increases, bfl2>0 when the temperature decreases, and the following conditions are satisfied: Δbfl1+Δbfl2> 0.
Wherein the amount of change in back focal length of the lens due to temperature change in refractive index of the lens, R value of the lens, thickness of the lens core, and air space between the lenses is defined as Δbfl3, specifically, bfl3>0 when the temperature increases, Δbfl3<0 when the temperature decreases. The lens is matched and assembled on a lens seat of the camera, the change amount of the back focal length of the lens caused by the temperature change of the lens seat is defined as delta BFL4, specifically, when the temperature is increased, BFL4>0, when the temperature is reduced, delta BFL4<0, and the lens always meets the following conditions in a high-temperature environment and a low-temperature environment: Δbfl3- Δbfl4=0. The high and low temperatures meet the relation, so that the lens and the camera are athermalized systems, namely the normal temperature, the high and low temperatures, and the imaging systems are clear and do not lose focus.
The space ring between the lenses and the lens holder are made of aluminum materials with linear expansion coefficients of 23.6E-06, and the realization of delta BFL 3-delta BFL4=0 is facilitated. The process difficulty is reduced.
The mini-type infrared imaging lens of the present invention will be described in detail with specific examples.
Example 1
Referring to fig. 1, the present invention discloses a wide-angle low-distortion line scanning lens, wherein 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 14, and a fifteenth lens 15, each of the first lens 1 to the fifteenth lens 15 comprises an object side surface facing an object side and passing imaging light and an image side surface facing an image side and passing imaging light;
The first lens element 1 has positive refractive power, wherein an object-side surface of the first lens element 1 is convex, and an image-side surface of the first lens element 1 is concave;
the second lens element 2 has negative refractive power, wherein an object-side surface of the second lens element 2 is convex, and an image-side surface of the second lens element 2 is concave;
the third lens element 3 has negative refractive power, wherein an object-side surface of the third lens element 3 is convex, and an image-side surface of the third lens element 3 is concave;
the fourth lens element 4 has negative refractive power, wherein an object-side surface of the fourth lens element 4 is convex, and an image-side surface thereof is concave;
the fifth lens element 5 has negative refractive power, wherein an object-side surface of the fifth lens element 5 is a concave surface, and an image-side surface of the fifth lens element 5 is a concave surface;
the sixth lens element 6 has positive refractive power, wherein an object-side surface of the sixth lens element 6 is convex, and an image-side surface thereof is convex;
The seventh lens element 7 with positive refractive power has a concave object-side surface and a convex image-side surface;
the eighth lens element 8 with negative refractive power has a concave object-side surface and a convex image-side surface;
The ninth lens element 9 has positive refractive power, wherein an object-side surface of the ninth lens element 9 is convex, and an image-side surface thereof is convex;
The tenth lens element 10 has positive refractive power, wherein an object-side surface of the tenth lens element 10 is convex, and an image-side surface thereof is convex;
the eleventh lens element 11 has negative refractive power, wherein the object-side surface of the eleventh lens element 11 is concave, and the image-side surface is concave;
The twelfth lens element 12 has positive refractive power, wherein 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 positive refractive power, wherein 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 a negative refractive power, wherein an object-side surface of the fourteenth lens element 14 is concave, and an image-side surface thereof is convex;
the fifteenth lens element 15 has a positive refractive power, wherein an object-side surface of the fifteenth lens element 15 is convex, and an image-side surface thereof is concave.
Wherein the image side surface of the seventh lens element 7 is cemented with the object side surface of the eighth lens element 8, the image side surface of the eleventh lens element 11 is cemented with the object side surface of the twelfth lens element 12, and the image side surface of the thirteenth lens element 13 is cemented with the object side surface of the fourteenth lens element 14.
The detailed optical data of this particular example 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 detail parameter 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, referring to fig. 2, it can be seen from the graph of the MTF graph of the lens under visible light that the MTF value of the full field of view is greater than 0.3 when the spatial frequency of the lens reaches 130lp/mm, the imaging quality is good, the resolution of the lens is high, and the lens can be matched with a 3.5 μm 4K camera. Referring to fig. 3, it can be seen from the graph that the optical distortion of the lens is 5-5%, the distortion is small, the wide-angle distortion is controlled, and the image quality is improved.
Example 2
As shown in fig. 4, the present embodiment is mainly different from embodiment 1 in optical parameters such as the radius of curvature and the lens thickness of each lens surface.
The detailed optical data of this particular example are 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 detail parameter 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, referring to fig. 5, the MTF graph of the lens under visible light shows that when the spatial frequency of the lens reaches 130lp/mm, the MTF value of the full field of view is greater than 0.3, the imaging quality is good, the resolution of the lens is high, and the lens can be matched with a 3.5 μm 4K camera. Referring to fig. 6, the field curvature and distortion diagram of the lens under visible light can be seen from the diagram, 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, the present embodiment is mainly different from embodiment 1 in optical parameters such as the radius of curvature and the lens thickness of each lens surface.
The detailed optical data of this particular example are 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 detail parameter 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, referring to fig. 8, it can be seen from the graph of the MTF graph of the lens under visible light that the MTF value of the full field of view is greater than 0.3 when the spatial frequency of the lens reaches 130lp/mm, the imaging quality is good, the resolution of the lens is high, and the lens can be matched with a 3.5 μm 4K camera. Referring to fig. 9, it can be seen from the graph that the optical distortion of the lens is 5-5%, the distortion is small, the wide-angle distortion is controlled, and the image quality is improved.
Example 4
As shown in fig. 10, the present embodiment is mainly different from embodiment 1 in optical parameters such as the radius of curvature and the lens thickness of each lens surface.
The detailed optical data of this particular example are shown in Table 4-1.
Table 4-1 detailed optical data for example 4
| Surface of the body | Radius of curvature | Thickness of (L) | Refractive index | Coefficient of dispersion | Focal length | |
| 0 | Object plane | 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 | -65.0 | 6.0 | 1.9 | 17.9 | -15.2 |
| 10 | 19.6 | 0.1 | ||||
| 11 | Sixth lens | 15.0 | 8.0 | 1.7 | 33.9 | 13.2 |
| 12 | -15.7 | 7.3 | ||||
| 13 | Diaphragm | Infinity | 1.7 | |||
| 14 | Seventh lens | Infinity | 7.5 | 1.8 | 23.8 | 6.8 |
| 15 | Eighth lens | -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 | 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 | -12.7 | 1.2 | 1.9 | 20.9 | -14.6 |
| 26 | -150.1 | 0.8 | ||||
| 27 | Fifteenth lens | 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 detail parameter 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, referring to fig. 11, it can be seen from the graph of the MTF graph of the lens under visible light that the MTF value of the full field of view is greater than 0.3 when the spatial frequency of the lens reaches 130lp/mm, the imaging quality is good, the resolution of the lens is high, and the lens can be matched with a 3.5 μm 4K camera. Referring to fig. 12, it can be seen that the optical distortion of the lens is 5-5%, the distortion is small, the wide-angle distortion is controlled, and the image quality is improved.
The present invention is not limited to the above-mentioned embodiments, and any changes or substitutions that can be easily understood by those skilled in the art within the technical scope of the present invention are intended to be included in the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.
Claims (10)
1. The utility model provides a wide angle low distortion line sweeps camera lens which characterized in that: the optical lens assembly 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 from an object side to an image side along an optical axis, wherein each of the first lens to the fifteenth lens comprises an object side face which faces the object side and passes imaging light rays and an image side face which faces the image side and passes imaging light rays;
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, 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, 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 element has negative refractive power, wherein the object-side surface of the fourth lens element is convex, and the image-side surface of the fourth lens element is concave;
The fifth lens element has negative refractive power, wherein the object-side surface of the fifth lens element is concave, and the image-side surface of the fifth lens element is concave;
the sixth lens element has positive refractive power, 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 diopter, 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 element has negative refractive power, wherein the object-side surface of the eighth lens element is concave, and the image-side surface of the eighth lens element is convex;
the ninth lens element has positive refractive power, wherein the object-side surface of the ninth lens element is convex, and the image-side surface of the ninth lens element is convex;
the tenth lens has positive diopter, 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 is a concave surface;
The twelfth lens element has positive refractive power, wherein the object-side surface of the twelfth lens element is convex, and the image-side surface of the twelfth lens element is convex;
The thirteenth lens element has positive refractive power, wherein the object-side surface of the thirteenth lens element is convex, and the image-side surface of the thirteenth lens element is convex;
the fourteenth lens element has negative refractive power, wherein the object-side surface of the fourteenth lens element is concave, and the image-side surface of the fourteenth lens element is convex;
The fifteenth lens element has positive refractive power, wherein the object-side surface of the fifteenth lens element is convex, and the image-side surface of the fifteenth lens element is concave.
2. A wide angle low distortion line scan lens as set forth in claim 1, wherein: the first lens is a crescent lens and satisfies: nd1 is larger than or equal to 1.8, wherein nd1 is the refractive index of the first lens.
3. A wide angle low distortion line scan lens as set forth in claim 1, wherein: the second lens, the third lens and the fourth lens are crescent lenses, and the following conditions are satisfied: 6< |f2/f| <7.3,3< |f3/f| <4.2,3< |f4/f| <4.6, where f is the lens focal length, f2 is the focal length of the second lens, f3 is the focal length of the third lens, and f4 is the focal length of the fourth lens.
4. A wide angle low distortion line scan lens as set forth in 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. A wide angle low distortion line scan lens as set forth in claim 1, wherein: the fifteenth lens satisfies: nd15 is not less than 1.75, wherein nd15 is the refractive index of the fifteenth lens.
6. A wide angle low distortion line scan lens as set forth in claim 1, wherein: an image side of the seventh lens element is cemented with an object side of the eighth lens element, an image side of the eleventh lens element is cemented with an object side of the twelfth lens element, and an image side of the thirteenth lens element is cemented with an object side 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< |fg 1/f| <12.5, 100< |fg 2/f| <350, where fg1 is the combined focal length of the eleventh and twelfth lenses and fg2 is the combined focal length of the thirteenth and fourteenth lenses.
8. The wide-angle low-distortion line scan lens of claim 6, wherein: the lens satisfies the following conditions: vd11 is less than or equal to 24, vd12 is more than or equal to 63, |Vd12-Vd11| >38, vd13 is more than or equal to 48, vd14 is less than or equal to 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. A wide angle low distortion line scan lens as set forth in 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 change amount of the back focal length caused by the temperature change of the fourth lens, the fifth lens, the eighth lens, the ninth lens, the tenth lens and the twelfth lens combination is defined as delta BFL1,
The refractive index temperature coefficients dn/dt of the first lens, the sixth lens, the seventh lens, the thirteenth lens and the fifteenth lens are all positive values, the change amount of the back focal length of the lens caused by the temperature change of the first lens, the sixth lens, the seventh lens, the thirteenth lens and the fifteenth lens is defined as delta BFL2,
Wherein Δbfl1+Δbfl2 > 0.
10. A wide angle low distortion line scan lens as set forth in claim 1, wherein: the amount of change in the back focal length of the lens due to temperature change in the refractive index of the lens, the R value of the lens, the thickness of the lens core and the air space between the lenses is defined as Δbfl3,
The lens is assembled on the lens base of the camera in a matching way, the change amount of the back focal length caused by the temperature change of the lens base is defined as delta BFL4,
Wherein Δbfl3- Δbfl4=0.
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| JP4864600B2 (en) * | 2006-08-11 | 2012-02-01 | 富士フイルム株式会社 | Projection type zoom lens and projection type display device |
| JP2008145967A (en) * | 2006-12-13 | 2008-06-26 | Sony Corp | Zoom lens and imaging apparatus |
| JP5042708B2 (en) * | 2007-05-21 | 2012-10-03 | 富士フイルム株式会社 | Projection lens and projection display device using the same |
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| CN204719319U (en) * | 2015-06-11 | 2015-10-21 | 北京空间机电研究所 | A kind of Large visual angle Dynamic Photography camera optical system |
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| CN109683282B (en) * | 2019-01-17 | 2021-02-26 | 广东奥普特科技股份有限公司 | Low-distortion wide-angle fixed-focus line-scanning machine vision lens optical system |
| CN111999869B (en) * | 2020-09-23 | 2024-07-19 | 厦门力鼎光电股份有限公司 | Infrared confocal zoom lens |
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