CN117369094B - Optical lens - Google Patents
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- CN117369094B CN117369094B CN202311673437.7A CN202311673437A CN117369094B CN 117369094 B CN117369094 B CN 117369094B CN 202311673437 A CN202311673437 A CN 202311673437A CN 117369094 B CN117369094 B CN 117369094B
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/06—Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces
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Abstract
The invention discloses an optical lens, which sequentially comprises from an object side to an imaging surface along an optical axis: the first lens with negative focal power has a convex object side surface and a concave image side surface; a second lens element with negative refractive power having a concave object-side surface and a convex image-side surface; a third lens having positive optical power, both the object-side surface and the image-side surface of which are convex; the object side surface of the fourth lens is a concave surface, the image side surface of the fourth lens is a convex surface, and the third lens and the fourth lens form a cemented lens with positive focal power; a fifth lens element with positive refractive power having convex object-side and image-side surfaces; a sixth lens with negative focal power, the object side surface and the image side surface of which are concave, wherein the fifth lens and the sixth lens form a cemented lens with negative focal power; the seventh lens with positive focal power has a convex object side surface and a convex image side surface. The optical lens disclosed by the invention has the advantages of large aperture, large field angle, high pixel and good thermal stability.
Description
Technical Field
The invention relates to the technical field of imaging lenses, in particular to an optical lens.
Background
With the popularization and rapid development of intelligent automobiles, more and more automobiles are equipped with different on-board visual systems, each automobile generally needs to be provided with more than 8 optical lenses, and the on-board lenses become one of the most used sensors in the intelligent process of the automobiles. The vehicle-mounted lens is used as a carrier for acquiring external information of the intelligent automobile, and the imaging quality requirement on the vehicle-mounted lens is higher and higher when the market demand is continuously increased, for example: higher resolution, clearer imaging, etc.
The vehicle-mounted lens is applied to an outdoor complex environment, so that the vehicle-mounted lens has extremely high requirements, not only is a large field angle required, but also has good thermal stability, so that the vehicle-mounted lens can keep good imaging performance under high and low temperature conditions.
Disclosure of Invention
Based on the above, the present invention aims to provide an optical lens, which has at least the advantages of large aperture, large field angle, high pixel and good thermal stability.
The invention provides an optical lens, which sequentially comprises from an object side to an imaging surface along an optical axis: the first lens with negative focal power has a convex object side surface and a concave image side surface; a second lens element with negative refractive power having a concave object-side surface and a convex image-side surface; a third lens having positive optical power, both the object-side surface and the image-side surface of which are convex; the object side surface of the fourth lens is a concave surface, the image side surface of the fourth lens is a convex surface, and the third lens and the fourth lens form a cemented lens with positive focal power; a fifth lens element with positive refractive power having convex object-side and image-side surfaces; a sixth lens with negative focal power, wherein the object side surface and the image side surface of the sixth lens are concave, and the fifth lens and the sixth lens form a cemented lens with negative focal power; a seventh lens element with positive optical power having convex object-side and image-side surfaces; wherein, the optical lens satisfies the following conditional expression:the method comprises the steps of carrying out a first treatment on the surface of the Wherein f4 represents an effective focal length of the fourth lens, and f represents an effective focal length of the optical lens.
Compared with the prior art, the optical lens provided by the invention adopts seven lenses with specific focal power, and adopts specific surface shape collocation and reasonable focal power distribution, so that the defocusing phenomenon of the optical lens caused by the influence of thermal expansion and cold contraction is effectively inhibited, the influence of temperature on the performance of the optical lens is reduced, the drift of an imaging surface of the optical lens caused by the temperature is reduced, the optical lens has higher resolving power in high-low temperature environments, the optical lens can be stably used in high-low temperature environments, and the optical lens has the advantages of high pixels and good thermal stability; meanwhile, as the surface type and focal power of each lens are reasonably arranged, the optical lens has the advantages of large aperture and large field angle, and can meet the use requirement of the vehicle-mounted lens. And the seven lenses can be glass spherical lenses, so that the offset of the back focus of the optical lens along with the temperature change can be effectively restrained, the temperature stability of the optical lens is improved, and the imaging capability of the optical lens can be further improved.
Drawings
Fig. 1 is a schematic structural diagram of an optical lens according to a first embodiment of the present invention;
FIG. 2 is a graph showing a field curvature of an optical lens according to a first embodiment of the present invention;
FIG. 3 is a graph showing F-Tan (θ) distortion of an optical lens according to a first embodiment of the present invention;
FIG. 4 is a diagram showing the relative illuminance of an optical lens in a first embodiment of the present invention;
FIG. 5 is a graph showing the MTF of the center field of view of an optical lens at-25℃in a first embodiment of the present invention;
FIG. 6 is a graph showing the MTF of the center field of view of an optical lens at 25℃in a first embodiment of the present invention;
FIG. 7 is a graph showing the MTF of the center field of view of an optical lens at 70deg.C in a first embodiment of the present invention;
FIG. 8 is a graph of center field defocus at-25℃for an optical lens of the first embodiment of the present invention;
FIG. 9 is a plot of center field defocus for an optical lens of the first embodiment of the present invention at 25 ℃;
FIG. 10 is a plot of center field defocus for an optical lens of the first embodiment of the present invention at 70 ℃;
fig. 11 is a schematic structural diagram of an optical lens according to a second embodiment of the present invention;
FIG. 12 is a graph showing a field curvature of an optical lens according to a second embodiment of the present invention;
FIG. 13 is a graph of F-Tan (θ) distortion of an optical lens in a second embodiment of the present invention;
FIG. 14 is a diagram showing the relative illuminance of an optical lens in a second embodiment of the present invention;
FIG. 15 is a graph of the center field MTF of an optical lens at-25 ℃ in a second embodiment of the present invention;
FIG. 16 is a graph showing the MTF of the center field of view of an optical lens at 25deg.C in a second embodiment of the present invention;
FIG. 17 is a graph showing the MTF of the center field of view of an optical lens at 70deg.C in a second embodiment of the present invention;
FIG. 18 is a center field defocus plot of an optical lens of a second embodiment of the present invention at-25 ℃;
FIG. 19 is a center field defocus plot of an optical lens of a second embodiment of the present invention at 25 ℃;
FIG. 20 is a plot of center field defocus at 70deg.C for an optical lens of a second embodiment of the present invention;
fig. 21 is a schematic structural diagram of an optical lens according to a third embodiment of the present invention;
FIG. 22 is a graph showing a field curvature of an optical lens according to a third embodiment of the present invention;
FIG. 23 is a F-Tan (θ) distortion plot of an optical lens in a third embodiment of the present invention;
FIG. 24 is a diagram showing the relative illuminance of an optical lens according to a third embodiment of the present invention;
FIG. 25 is a graph showing the MTF of the center field of view of an optical lens at-25℃in a third embodiment of the present invention;
FIG. 26 is a graph showing the MTF of the center field of view of an optical lens at 25deg.C in a third embodiment of the present invention;
FIG. 27 is a graph showing the MTF of the center field of view of an optical lens at 70deg.C in a third embodiment of the present invention;
FIG. 28 is a center field defocus plot of an optical lens of a third embodiment of the present invention at-25 ℃;
FIG. 29 is a plot of center field defocus for an optical lens of a third embodiment of the present invention at 25 ℃;
FIG. 30 is a plot of center field defocus for an optical lens of a third embodiment of the present invention at 70 ℃;
fig. 31 is a schematic structural diagram of an optical lens according to a fourth embodiment of the present invention;
FIG. 32 is a graph showing a field curvature of an optical lens according to a fourth embodiment of the present invention;
FIG. 33 is a F-Tan (θ) distortion plot of an optical lens in a fourth embodiment of the present invention;
FIG. 34 is a graph showing the relative illuminance of an optical lens according to a fourth embodiment of the present invention;
FIG. 35 is a center field MTF plot for an optical lens in a fourth embodiment of the present invention at-25 ℃;
FIG. 36 is a center field MTF plot for an optical lens in a fourth embodiment of the present invention at 25 ℃;
FIG. 37 is a graph showing the MTF of the center field of view of an optical lens at 70deg.C in a fourth embodiment of the present invention;
FIG. 38 is a center field defocus plot of an optical lens of a fourth embodiment of the present invention at-25 ℃;
FIG. 39 is a center field defocus plot of an optical lens of a fourth embodiment of the present invention at 25 ℃;
fig. 40 is a center field defocus plot of an optical lens of a fourth embodiment of the present invention at 70 ℃.
Detailed Description
In order that the invention may be readily understood, a more complete description of the invention will be rendered by reference to the appended drawings. Several embodiments of the invention are presented in the figures. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Like reference numerals refer to like elements throughout the specification.
The invention provides an optical lens, which comprises seven lenses in total, and sequentially comprises from an object side to an imaging surface along an optical axis: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens.
The first lens has negative focal power, 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 focal power, the object side surface is a concave surface, and the image side surface is a convex surface; the third lens has positive focal power, and the object side surface and the image side surface of the third lens are convex; the fourth lens is provided with focal power, the object side surface of the fourth lens is a concave surface, the image side surface of the fourth lens is a convex surface, and the third lens and the fourth lens form a cemented lens with positive focal power; the fifth lens has positive focal power, and the object side surface and the image side surface of the fifth lens are convex; the sixth lens is provided with negative focal power, the object side surface and the image side surface of the sixth lens are concave, and the fifth lens and the sixth lens form a cemented lens with negative focal power; the seventh lens has positive focal power, and both the object side surface and the image side surface of the seventh lens are convex.
In some embodiments, the optical lens further includes a diaphragm, where the diaphragm is used to limit the amount of light entering, so as to change the brightness of the image, and improve the performance and quality of the optical lens. Preferably, the diaphragm is located between the fourth lens and the fifth lens, so that the functions of the first lens to the seventh lens can be reasonably distributed, for example, the first lens to the fourth lens are utilized to receive light rays with a large angle of view, so that the lens has a larger angle of view, and the fifth lens to the seventh lens are used for correcting aberration, and are beneficial to simplifying the structure of the optical lens to improve the imaging quality.
In some embodiments, the optical lens further includes an optical filter, and the optical filter includes an object side surface and an image side surface. The optical filter can be an infrared cut-off optical filter and is used for filtering interference light and preventing the interference light from reaching an imaging surface of the optical lens to influence normal imaging.
According to the optical lens provided by the invention, seven lenses with specific focal power are adopted, and specific surface shape collocation and reasonable focal power distribution are adopted, so that the defocusing phenomenon of the optical lens due to the influence of thermal expansion and cold contraction is effectively inhibited, the influence of temperature on the performance of the optical lens is reduced, the drift of an imaging surface of the optical lens due to the temperature is reduced, the optical lens has higher resolving power in high-low temperature environments, the optical lens can be normally used in high-low temperature environments, and the optical lens has good applicability; meanwhile, as the surface type and focal power of each lens are reasonably arranged, the optical lens has the advantages of large aperture and large field angle, and can meet the use requirement of the vehicle-mounted lens. And the seven lenses are all made of glass lenses, so that the offset of the back focus of the optical lens along with the temperature change can be effectively restrained, the temperature stability of the optical lens is improved, and the imaging capability of the optical lens can be further improved.
In some embodiments, the optical lens satisfies the following conditional expression:
；
where f4 denotes an effective focal length of the fourth lens, and f denotes an effective focal length of the optical lens. The ratio of the focal length of the fourth lens to the focal length of the optical lens is reasonably controlled to reduce the drift of the imaging surface of the optical lens caused by heating, so that the optical lens can be normally used in high and low temperature environments, and the thermal stability of the optical lens is improved.
In some embodiments, the optical lens satisfies the following conditional expression:
8<TTL/f<11；
where TTL denotes the optical total length of the optical lens and f denotes the effective focal length of the optical lens. The relation between the length and the focal length of the optical lens can be effectively limited by meeting the above conditional expression, so that the optical lens has sufficient space, the reasonable distribution of each lens is facilitated, and the temperature drift can be reduced.
In some embodiments, the optical lens satisfies the following conditional expression:
0.15<IH/TTL<0.25；
wherein, TTL represents the total optical length of the optical lens, IH represents the real image height corresponding to the maximum field angle of the optical lens. The optical lens can achieve the purposes that the image height and the total length of the optical lens are in a proper range and the optical lens has high pixel performance.
In some embodiments, the optical lens satisfies the following conditional expression:
7.0<f×tan(FOV/2) <7.1；
where f represents the effective focal length of the optical lens and FOV represents the maximum field angle of the optical lens. The condition is satisfied, the maximum field angle and the effective focal length of the optical lens are controlled, so that the optical lens has a larger field angle, the shooting requirement of a large wide angle can be satisfied, and meanwhile, the optical lens also has a larger imaging surface, and the higher pixel performance can be realized.
In some embodiments, the optical lens satisfies the following conditional expression:
0.4<f1234/f567<1；
where f1234 represents the combined focal length of the first to fourth lenses, and f567 represents the combined focal length of the fifth to seventh lenses. The ratio of the combined focal length of the first lens to the fourth lens to the combined focal length of the fifth lens to the seventh lens is reasonably controlled to reasonably distribute the focal power ratio of the lens groups before and after the diaphragm, and the thermal drift generated by the lens groups before and after the diaphragm in a high-low temperature environment can be synthesized, so that the optical lens has good imaging performance in the high-low temperature environment, and the stability of the optical lens is improved.
In some embodiments, the optical lens satisfies the following conditional expression:
-0.5<f34/f56<-0.2；
where f34 denotes a combined focal length of the third lens and the fourth lens, and f56 denotes a combined focal length of the fifth lens and the sixth lens. The ratio of the combined focal length of the third lens and the fourth lens to the combined focal length of the fifth lens and the sixth lens is reasonably controlled, so that various aberrations can be balanced, and the imaging quality of the optical lens can be improved.
In some embodiments, the optical lens satisfies the following conditional expression:
；
wherein f3 denotes an effective focal length of the third lens, f4 denotes an effective focal length of the fourth lens, and f denotes an effective focal length of the optical lens. The optical power of the optical lens is reasonably configured by controlling the ratio of the sum of the optical power of the third lens and the optical power of the fourth lens to the optical power of the optical lens, so that various aberrations and chromatic aberration of the optical lens can be corrected, the sensitivity of the lens can be reduced, the distortion can be reduced, the light quantity loss caused by reflection between lenses can be reduced, the relative illuminance can be improved, and the overall structure of the optical lens is reasonable.
In some embodiments, the optical lens satisfies the following conditional expression:
-12<(R21+R22)/(R21-R22)<-4；
wherein R21 represents the radius of curvature of the object-side surface of the second lens, and R22 represents the radius of curvature of the image-side surface of the second lens. The curvature radius of the object side surface and the curvature radius of the image side surface of the second lens are reasonably configured, so that the edge view field light trend can be controlled, the image height can be increased, and the off-axis aberration of the optical lens can be reduced.
In some embodiments, the optical lens satisfies the following conditional expression:
-0.3<(R31+R32)/(R31-R32)<0；
where R31 represents the radius of curvature of the object-side surface of the third lens element, and R32 represents the radius of curvature of the image-side surface of the third lens element. The method meets the conditional expression, and is favorable for reducing the distortion generated by the third lens, reducing the difficulty of the subsequent lens in distortion correction and improving the imaging quality of the optical lens by reasonably configuring the curvature radiuses of the object side surface and the image side surface of the third lens.
In some embodiments, the optical lens satisfies the following conditional expression:
-0.7<(R71+R72)/(R71-R72)<-0.2；
where R71 denotes a radius of curvature of the seventh lens object-side surface, and R72 denotes a radius of curvature of the seventh lens image-side surface. The spherical aberration correction method meets the condition, and is favorable for correcting the spherical aberration and improving the imaging quality of the optical lens by reasonably configuring the curvature radiuses of the object side surface and the image side surface of the seventh lens.
In some embodiments, the optical lens satisfies the following conditional expression:
-1.8<(R61+R62)/f<-0.1；
where R61 represents the radius of curvature of the object-side surface of the sixth lens element, and R62 represents the radius of curvature of the image-side surface of the sixth lens element. The relative illuminance of the optical lens can be improved by controlling the ratio of the sum of the radii of curvature of the object side surface and the image side surface of the sixth lens to the optical power of the optical lens.
In some embodiments, the optical lens satisfies the following conditional expression:
-2.8<(R31+R32)/f<0；
where R31 represents the radius of curvature of the object-side surface of the third lens element, and R32 represents the radius of curvature of the image-side surface of the third lens element. The ratio of the sum of the curvature radiuses of the object side surface and the image side surface of the third lens to the focal power of the lens is controlled to meet the conditional expression, so that the chromatic aberration of the optical lens is optimized, and the imaging quality is improved.
In some embodiments, the optical lens satisfies the following conditional expression:
0.7<R41/R42<1.1；
where R41 represents the radius of curvature of the fourth lens object-side surface, and R42 represents the radius of curvature of the fourth lens image-side surface. The lens system can restrain the curvature radiuses of the object side surface and the image side surface of the fourth lens, can better control the focal length of the fourth lens, enables the object side surface and the image side surface of the fourth lens to have similar surface types, can achieve a proper deflection effect on light rays, is beneficial to reducing the spherical aberration and the field curvature of the fourth lens, and improves the imaging quality of the optical lens.
In some embodiments, the optical lens satisfies the following conditional expression:
6<∑CT/f<8；
wherein Σct represents the sum of the center thicknesses of the first lens to the seventh lens, and f represents the effective focal length of the optical lens. The method meets the above conditional expression, reasonably controls the sum of the thicknesses of the centers of the lenses along the optical axis, is favorable for optimizing the field curvature of the optical lens, can realize high pixel characteristics, and improves the imaging quality of the optical lens.
In some embodiments, the optical lens satisfies the following conditional expression:
0.95<ET2/CT2<1.05；
where ET2 represents the edge thickness of the second lens and CT2 represents the center thickness of the second lens. The method meets the above conditional expression, reasonably sets the edge-to-thickness ratio of the second lens, can reduce the processing difficulty of the second lens, and can effectively correct the aberration of the edge view field.
In some embodiments, the optical lens satisfies the following conditional expression:
3<CT7/CT5<6；
wherein CT7 represents the center thickness of the seventh lens, and CT5 represents the center thickness of the fifth lens. The ratio of the center thicknesses of the seventh lens and the fifth lens is reasonably configured to meet the above conditional expression, which is beneficial to meeting the requirements of the processability and the manufacturability of the optical lens.
In some embodiments, the optical lens satisfies the following conditional expression:
5<(CT3+CT4)/CT5<9；
wherein CT3 represents the center thickness of the third lens, CT4 represents the center thickness of the fourth lens, and CT5 represents the center thickness of the fifth lens. The center thicknesses of the third lens, the fourth lens and the fifth lens are limited to a reasonable range by satisfying the above conditional expression, and each lens can be kept to have good workability and reasonable arrangement in the system.
In some embodiments, the optical lens satisfies the following conditional expression:
0.06< BFL/TTL <0.12；
where BFL represents an air space on the optical axis from the image side surface of the seventh lens to the image plane, and TTL represents an optical total length of the optical lens. The optical lens has proper optical back focus on the premise of meeting the total length requirement of the optical lens, is favorable for the assembly of the optical lens module and can improve the imaging quality.
In some embodiments, the optical lens satisfies the following conditional expression:
-0.45<Sag3/d3<-0.25；
-0.4<Sag4/d4<-0.20；
where Sag3 represents the object-side elevation of the second lens element, d3 represents the light-transmitting half-diameter of the object-side surface of the second lens element, sag4 represents the image-side elevation of the second lens element, and d4 represents the light-transmitting half-diameter of the image-side surface of the second lens element. The method meets the above conditional expression, can limit the surface shape of the second lens, can reduce the processing difficulty of the second lens, can control the trend of marginal view field rays, highlight the detail information of the central view field of the optical lens, and improve the imaging quality of the optical lens.
In some embodiments, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens are glass spherical lenses. The offset of the back focus of the optical lens along with the temperature change can be effectively restrained, so that the temperature stability of the optical lens is improved, and the imaging capability of the optical lens can be further improved.
The invention is further illustrated in the following examples. In various embodiments, the thickness, radius of curvature, and material selection portion of each lens in the optical lens may vary, and for specific differences, reference may be made to the parameter tables of the various embodiments. The following examples are merely preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the following examples, and any other changes, substitutions, combinations or simplifications that do not depart from the gist of the present invention are intended to be equivalent substitutes within the scope of the present invention.
First embodiment
Referring to fig. 1, a schematic structural diagram of an optical lens 100 according to a first embodiment of the present invention is shown, where the optical lens 100 includes, in order from an object side to an imaging surface S15 along an optical axis: the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the stop ST, the fifth lens L5, the sixth lens L6, the seventh lens L7, and the filter G1.
The first lens element L1 has negative refractive power, wherein an object-side surface S1 thereof is convex, and an image-side surface S2 thereof is concave; the second lens element L2 has negative refractive power, wherein an object-side surface S3 thereof is concave, and an image-side surface S4 thereof is convex; the third lens element L3 has positive refractive power, wherein an object-side surface S5 thereof is convex, and an image-side surface thereof is convex; the fourth lens element L4 has positive refractive power, wherein an object-side surface thereof is concave, an image-side surface S7 thereof is convex, the third lens element L3 and the fourth lens element L4 form a cemented lens with positive refractive power, and the image-side surface of the third lens element L3 and the object-side surface of the fourth lens element form a cemented surface S6; the fifth lens element L5 has positive refractive power, wherein an object-side surface S8 thereof is convex, and an image-side surface thereof is convex; the sixth lens element L6 has negative refractive power, wherein an object-side surface thereof is concave, an image-side surface S10 thereof is concave, the fifth lens element L5 and the sixth lens element L6 form a cemented lens with negative refractive power, and the image-side surface of the fifth lens element L5 and the object-side surface of the sixth lens element L6 form a cemented surface S9; the seventh lens element L7 with positive refractive power has a convex object-side surface S11 and a convex image-side surface S12; the object side surface of the filter G1 is S13, and the image side surface is S14. The first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6 and the seventh lens L7 are all glass spherical lenses.
The relevant parameters of each lens in the optical lens 100 according to the first embodiment of the present invention are shown in table 1.
TABLE 1
In the present embodiment, the schematic structure diagram, the field curve diagram, the optical distortion diagram, the relative illuminance diagram, the MTF diagram and the defocus diagram at the low temperature of-25 ℃, the MTF diagram and the defocus diagram at the normal temperature of 25 ℃, and the MTF diagram and the defocus diagram at the high temperature of 70 ℃ of the optical lens 100 are shown in fig. 1 to 10, respectively.
Fig. 2 shows a field curve of the optical lens 100 in the present embodiment, which indicates the extent of curvature of the meridional image plane and the sagittal image plane, and the abscissa in the figure is the offset (unit: mm) and the ordinate is the half field angle (unit: degree). From the figure, it can be seen that the curvature of field of the image planes in two directions is controlled within ±0.05mm, which indicates that the curvature of field of the optical lens 100 is well corrected.
Fig. 3 shows an optical F-Tan (θ) distortion graph of the optical lens 100 of the present embodiment, which represents distortion at different image heights on an imaging plane, in which the horizontal axis represents the percent distortion and the vertical axis represents the half field angle (unit: degree). From the figure, it can be seen that the optical distortion is controlled within ±40%, indicating that the distortion of the optical lens 100 is well corrected.
Fig. 4 shows a relative illuminance curve of the optical lens 100 of the present embodiment, which represents the relative illuminance values at different angles of view on the imaging plane, the horizontal axis represents the half angle of view (unit: °), and the vertical axis represents the relative illuminance. As can be seen from the figure, the relative illuminance value of the optical lens 100 at the maximum half angle of view is still greater than 0.75, indicating that the optical lens 100 has a better relative illuminance.
Fig. 5, 6 and 7 show graphs of MTF (modulation transfer function) of the optical lens 100 of the present embodiment at-25 ℃, 25 ℃ and 70 ℃, which represent lens imaging modulation degrees of different spatial frequencies at respective fields of view, with the horizontal axis representing spatial frequency (units lp/mm) and the vertical axis representing MTF values. As can be seen from the graph, the MTF values of the embodiment are above 0.5, the MTF curve is uniformly and smoothly reduced in the range of 0-120 lp/mm, and the MTF image has good imaging quality and good detail resolution under the conditions of low frequency and high frequency.
Fig. 8, 9 and 10 show defocus graphs of the central field of view of the optical lens 100 of the present embodiment at-25 ℃, 25 ℃ and 70 ℃, which represent the focus offset of the central field of view at different temperatures, indicating that the optical lens 100 has small temperature drift and good optical thermal stability.
Second embodiment
Referring to fig. 11, a schematic structural diagram of an optical lens 200 according to a second embodiment of the present invention is shown, where the optical lens 200 includes, in order from an object side to an imaging surface S15 along an optical axis: the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the stop ST, the fifth lens L5, the sixth lens L6, the seventh lens L7, and the filter G1.
The first lens element L1 has negative refractive power, wherein an object-side surface S1 thereof is convex, and an image-side surface S2 thereof is concave; the second lens element L2 has negative refractive power, wherein an object-side surface S3 thereof is concave, and an image-side surface S4 thereof is convex; the third lens element L3 has positive refractive power, wherein an object-side surface S5 thereof is convex, and an image-side surface thereof is convex; the fourth lens element L4 has positive refractive power, wherein an object-side surface thereof is concave, an image-side surface S7 thereof is convex, the third lens element L3 and the fourth lens element L4 form a cemented lens with positive refractive power, and the image-side surface of the third lens element L3 and the object-side surface of the fourth lens element form a cemented surface S6; the fifth lens element L5 has positive refractive power, wherein an object-side surface S8 thereof is convex, and an image-side surface thereof is convex; the sixth lens element L6 has negative refractive power, wherein an object-side surface thereof is concave, an image-side surface S10 thereof is concave, the fifth lens element L5 and the sixth lens element L6 form a cemented lens with negative refractive power, and the image-side surface of the fifth lens element L5 and the object-side surface of the sixth lens element L6 form a cemented surface S9; the seventh lens element L7 with positive refractive power has a convex object-side surface S11 and a convex image-side surface S12; the object side surface of the filter G1 is S13, and the image side surface is S14. The first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6 and the seventh lens L7 are all glass spherical lenses.
The relevant parameters of each lens in the optical lens 200 according to the second embodiment of the present invention are shown in table 2.
TABLE 2
In the present embodiment, the schematic structure diagram, the field curve diagram, the optical distortion diagram, the relative illuminance diagram, the MTF diagram and the defocus diagram at the low temperature of-25 ℃, the MTF diagram and the defocus diagram at the normal temperature of 25 ℃, and the MTF diagram and the defocus diagram at the high temperature of 70 ℃ of the optical lens 200 are shown in fig. 11 to 20, respectively. As can be seen from fig. 12, the curvature of field of the image planes in both directions is controlled within ±0.05mm, which indicates that the curvature of field of the optical lens 200 is well corrected. As can be seen from fig. 13, the optical distortion is controlled within ±40%, indicating that the distortion of the optical lens 200 is well corrected. As can be seen from fig. 14, the relative illuminance value of the optical lens 200 at the maximum half angle of view is still greater than 0.8, which indicates that the optical lens 200 has a better relative illuminance. As can be seen from fig. 15, 16 and 17, the MTF values of the present embodiment are all above 0.6, and the MTF curves are uniformly and smoothly lowered in the range of 0 to 120lp/mm, and have good imaging quality and good detail resolution at both low and high frequencies. As can be seen from fig. 18, 19 and 20, the focus offset of the central field of view of the optical lens 200 at different temperatures shows that the optical lens 200 has small temperature drift and good optical thermal stability.
Third embodiment
Referring to fig. 21, a schematic structural diagram of an optical lens 300 according to a third embodiment of the present invention is shown, where the optical lens 300 includes, in order from an object side to an imaging surface S15 along an optical axis: the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the stop ST, the fifth lens L5, the sixth lens L6, the seventh lens L7, and the filter G1.
The first lens element L1 has negative refractive power, wherein an object-side surface S1 thereof is convex, and an image-side surface S2 thereof is concave; the second lens element L2 has negative refractive power, wherein an object-side surface S3 thereof is concave, and an image-side surface S4 thereof is convex; the third lens element L3 has positive refractive power, wherein an object-side surface S5 thereof is convex and an image-side surface thereof is convex. The fourth lens element L4 has a negative refractive power, wherein an object-side surface thereof is concave, an image-side surface S7 thereof is convex, the third lens element L3 and the fourth lens element L4 form a cemented lens with positive refractive power, and the image-side surface of the third lens element L3 and the object-side surface of the fourth lens element form a cemented surface S6; the fifth lens element L5 has positive refractive power, wherein an object-side surface S8 thereof is convex, and an image-side surface thereof is convex; the sixth lens element L6 has negative refractive power, wherein an object-side surface thereof is concave, an image-side surface S10 thereof is concave, the fifth lens element L5 and the sixth lens element L6 form a cemented lens with negative refractive power, and the image-side surface of the fifth lens element L5 and the object-side surface of the sixth lens element L6 form a cemented surface S9; the seventh lens element L7 with positive refractive power has a convex object-side surface S11 and a convex image-side surface S12; the object side surface of the filter G1 is S13, and the image side surface is S14. The first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6 and the seventh lens L7 are all glass spherical lenses.
The relevant parameters of each lens in the optical lens 300 according to the third embodiment of the present invention are shown in table 3.
TABLE 3 Table 3
In the present embodiment, the schematic structure diagram, the field curve diagram, the optical distortion diagram, the relative illuminance diagram, the MTF diagram and the defocus diagram at the low temperature of-25 ℃, the MTF diagram and the defocus diagram at the normal temperature of 25 ℃, and the MTF diagram and the defocus diagram at the high temperature of 70 ℃ of the optical lens 300 are shown in fig. 21 to 30, respectively. As can be seen from fig. 22, the curvature of field of the image planes in both directions is controlled within ±0.10mm, which indicates that the curvature of field of the optical lens 300 is well corrected. As can be seen from fig. 23, the optical distortion is controlled within ±40%, indicating that the distortion of the optical lens 300 is well corrected. As can be seen from fig. 24, the relative illuminance value of the optical lens 300 at the maximum half angle of view is still greater than 0.8, which indicates that the optical lens 300 has a better relative illuminance. As can be seen from fig. 25, 26 and 27, the MTF values of the present embodiment are all above 0.6, and the MTF curves are uniformly and smoothly lowered in the range of 0 to 120lp/mm, and have good imaging quality and good detail resolution at both low and high frequencies. As can be seen from fig. 28, 29 and 30, the focus offset of the central field of view of the optical lens 300 at different temperatures shows that the optical lens 300 has small temperature drift and good optical thermal stability.
Fourth embodiment
Referring to fig. 31, a schematic structural diagram of an optical lens 400 according to a fourth embodiment of the present invention is shown, where the optical lens 400 includes, in order from an object side to an imaging surface S15 along an optical axis: the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the stop ST, the fifth lens L5, the sixth lens L6, the seventh lens L7, and the filter G1.
The first lens element L1 has negative refractive power, wherein an object-side surface S1 thereof is convex, and an image-side surface S2 thereof is concave; the second lens element L2 has negative refractive power, wherein an object-side surface S3 thereof is concave, and an image-side surface S4 thereof is convex; the third lens element L3 has positive refractive power, wherein an object-side surface S5 thereof is convex, and an image-side surface thereof is convex; the fourth lens element L4 has a negative refractive power, wherein an object-side surface thereof is concave, an image-side surface S7 thereof is convex, the third lens element L3 and the fourth lens element L4 form a cemented lens with positive refractive power, and the image-side surface of the third lens element L3 and the object-side surface of the fourth lens element form a cemented surface S6; the fifth lens element L5 has positive refractive power, wherein an object-side surface S8 thereof is convex, and an image-side surface thereof is convex; the sixth lens element L6 has negative refractive power, wherein an object-side surface thereof is concave, an image-side surface S10 thereof is concave, the fifth lens element L5 and the sixth lens element L6 form a cemented lens with negative refractive power, and the image-side surface of the fifth lens element L5 and the object-side surface of the sixth lens element L6 form a cemented surface S9; the seventh lens element L7 with positive refractive power has a convex object-side surface S11 and a convex image-side surface S12; the object side surface of the filter G1 is S13, and the image side surface is S14. The first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6 and the seventh lens L7 are all glass spherical lenses.
The relevant parameters of each lens in the optical lens 400 according to the fourth embodiment of the present invention are shown in table 4.
TABLE 4 Table 4
In the present embodiment, the schematic structure diagram, the field curve diagram, the optical distortion diagram, the relative illuminance diagram, the MTF diagram and the defocus diagram at the low temperature of-25 ℃, the MTF diagram and the defocus diagram at the normal temperature of 25 ℃, and the MTF diagram and the defocus diagram at the high temperature of 70 ℃ of the optical lens 400 are shown in fig. 31 to 40, respectively. As can be seen from fig. 32, the curvature of field of the image planes in both directions is controlled within ±0.07mm, which indicates that the curvature of field of the optical lens 400 is well corrected. As can be seen from fig. 33, the optical distortion is controlled within ±40%, indicating that the distortion of the optical lens 400 is well corrected. As can be seen from fig. 34, the relative illuminance value of the optical lens 400 at the maximum half angle of view is still greater than 0.8, which indicates that the optical lens 400 has a better relative illuminance. As can be seen from fig. 35, 36 and 37, the MTF values of the present embodiment are all above 0.6, and the MTF curves are uniformly and smoothly lowered in the range of 0 to 120lp/mm, and have good imaging quality and good detail resolution at both low and high frequencies. As can be seen from fig. 38, 39 and 40, the focus offset of the central field of view of the optical lens 400 at different temperatures shows that the optical lens 400 has small temperature drift and good optical thermal stability.
Table 5 is an optical characteristic corresponding to the above four embodiments, and mainly includes an effective focal length F, an f#, an optical total length TTL, a maximum field angle FOV and a corresponding real image height IH of the optical lens, and a value corresponding to each of the above conditional expressions.
TABLE 5
In summary, the optical lens provided by the invention adopts seven lenses with specific focal power, and adopts specific surface shape collocation and reasonable focal power distribution, so that the resolution of the lens in high and low temperature environments is clear, the stability of the optical lens is ensured, and meanwhile, the applicability of high and low temperature is realized; in addition, the seven lenses can be made of glass, so that the lens is not easily affected by expansion caused by heat and contraction caused by cold, and the serious defocusing phenomenon can be caused, and the influence of temperature on the optical performance of the lens can be reduced.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above examples represent only a few embodiments of the present invention, which are described in more detail and are not to be construed as limiting the scope of the present invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. The scope of the invention should therefore be pointed out in the appended claims.
Claims (10)
1. An optical lens comprising seven lenses in total, in order from an object side to an imaging surface along an optical axis, comprising:
the first lens with negative focal power has a convex object side surface and a concave image side surface;
a second lens element with negative refractive power having a concave object-side surface and a convex image-side surface;
a third lens having positive optical power, both the object-side surface and the image-side surface of which are convex;
the object side surface of the fourth lens is a concave surface, the image side surface of the fourth lens is a convex surface, and the third lens and the fourth lens form a cemented lens with positive focal power;
a fifth lens element with positive refractive power having convex object-side and image-side surfaces;
a sixth lens with negative focal power, wherein the object side surface and the image side surface of the sixth lens are concave, and the fifth lens and the sixth lens form a cemented lens with negative focal power;
a seventh lens element with positive optical power having convex object-side and image-side surfaces;
wherein, the optical lens satisfies the following conditional expression:
;
wherein f4 represents an effective focal length of the fourth lens, and f represents an effective focal length of the optical lens.
2. The optical lens according to claim 1, wherein the optical lens satisfies the following conditional expression:
8<TTL/f<11；
wherein TTL represents the total optical length of the optical lens, and f represents the effective focal length of the optical lens.
3. The optical lens according to claim 1, wherein the optical lens satisfies the following conditional expression:
0.15<IH/TTL<0.25；
wherein TTL represents the total optical length of the optical lens, and IH represents the real image height corresponding to the maximum field angle of the optical lens.
4. The optical lens according to claim 1, wherein the optical lens satisfies the following conditional expression:
0.4<f1234/f567<1；
where f1234 represents the combined focal length of the first to fourth lenses, and f567 represents the combined focal length of the fifth to seventh lenses.
5. The optical lens according to claim 1, wherein the optical lens satisfies the following conditional expression:
-0.3<(R31+R32)/(R31-R32)<0；
wherein R31 represents a radius of curvature of the object-side surface of the third lens, and R32 represents a radius of curvature of the image-side surface of the third lens.
6. The optical lens according to claim 1, wherein the optical lens satisfies the following conditional expression:
0.7<R41/R42<1.1；
wherein R41 represents a radius of curvature of the fourth lens object-side surface, and R42 represents a radius of curvature of the fourth lens image-side surface.
7. The optical lens according to claim 1, wherein the optical lens satisfies the following conditional expression:
0.95<ET2/CT2<1.05；
wherein ET2 represents the edge thickness of the second lens and CT2 represents the center thickness of the second lens.
8. The optical lens according to claim 1, wherein the optical lens satisfies the following conditional expression:
5<(CT3+CT4)/CT5<9；
wherein CT3 represents the center thickness of the third lens, CT4 represents the center thickness of the fourth lens, and CT5 represents the center thickness of the fifth lens.
9. The optical lens according to claim 1, wherein the optical lens satisfies the following conditional expression:
0.06< BFL/TTL <0.12；
wherein BFL represents an air space between the image side surface of the seventh lens and the imaging surface on the optical axis, and TTL represents an optical total length of the optical lens.
10. The optical lens according to claim 1, wherein the optical lens satisfies the following conditional expression:
-0.45<Sag3/d3<-0.25；
-0.4<Sag4/d4<-0.20；
wherein Sag3 represents the object-side sagittal height of the second lens, d3 represents the light-transmitting half-diameter of the object-side surface of the second lens, sag4 represents the image-side sagittal height of the second lens, and d4 represents the light-transmitting half-diameter of the image-side surface of the second lens.
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