CN219349252U - Optical imaging system - Google Patents
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- CN219349252U CN219349252U CN202320853989.5U CN202320853989U CN219349252U CN 219349252 U CN219349252 U CN 219349252U CN 202320853989 U CN202320853989 U CN 202320853989U CN 219349252 U CN219349252 U CN 219349252U
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Abstract
The utility model relates to an ultra-wide angle optical imaging system, comprising: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, and a ninth lens that are arranged in order along an optical axis from an object side to an image side, the first lens, the second lens, and the seventh lens having negative optical power, the fourth lens, the fifth lens, the sixth lens, the eighth lens, and the ninth lens having positive optical power, the third lens having positive optical power or negative optical power; the first lens and the second lens are convex-concave lenses, the image side surface of the third lens is concave, the fourth lens is a concave-convex lens or the object side surface of the fourth lens is convex, the fifth lens and the sixth lens are convex-convex lenses, the seventh lens is a concave-convex lens, the object side surface of the eighth lens is convex, and the image side surface of the ninth lens is convex; the focal length f1 of the first lens and the total focal length f of the optical imaging system satisfy the conditional expression: -2.5.ltoreq.f1/f.ltoreq.1.6.
Description
Technical Field
The utility model relates to the technical field of optical lenses, in particular to an ultra-wide angle optical imaging system.
Background
With the development of optical technology, the wide-angle lens is widely applied to various fields such as security monitoring, unmanned aerial vehicle shooting, mobile phone shooting, machine vision, moving camera and the like due to the advantages of wide shooting field, clear imaging and the like, and the trend and difficulty of the lens development are often that the larger shooting angle, the larger light incoming amount, the higher-definition picture and the smaller size are achieved. The existing ultra-wide angle lens in the market mainly has the following defects:
1. often, the head is large, the weight of the lens is heavy, and the requirements of miniaturization and light weight cannot be met;
2. most of the ultra-wide angle lenses have insufficient image quality for high definition;
3. although some ultra-wide-angle lenses can meet higher image quality requirements, the aperture is often small, and the ultra-wide-angle lenses cannot adapt to darker environments at night or in overcast and rainy days.
Therefore, a lens capable of realizing an ultra wide angle, a large aperture, a high resolution, and a small volume is demanded.
Disclosure of Invention
In view of the above shortcomings of the prior art, it is an object of the present utility model to provide an optical imaging system with ultra-wide angle.
In order to achieve the above object, the present utility model provides an ultra-wide angle optical imaging system comprising: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, and a ninth lens that are arranged in this order along an optical axis from an object side to an image side, the first lens, the second lens, and the seventh lens having negative optical power, the fourth lens, the fifth lens, the sixth lens, the eighth lens, and the ninth lens having positive optical power, characterized in that the third lens has positive optical power or negative optical power;
the first lens element and the second lens element are concave-convex lenses, the image side surface of the third lens element is concave, the fourth lens element is concave-convex or the object side surface is convex, the fifth lens element and the sixth lens element are convex-convex lenses, the seventh lens element is concave-convex lenses, the object side surface of the eighth lens element is convex, and the image side surface of the ninth lens element is convex;
the focal length f1 of the first lens and the total focal length f of the optical imaging system satisfy the conditional expression: -2.5.ltoreq.f1/f.ltoreq.1.6.
According to an aspect of the present utility model, the optical imaging system further includes a double cemented lens cemented by the sixth lens and the seventh lens.
According to one aspect of the present utility model, the combined focal length f67 of the sixth lens and the seventh lens and the total focal length f of the optical imaging system satisfy the conditional expression: -6.6.ltoreq.f67/f.ltoreq.4.0.
According to an aspect of the present utility model, the refractive index nd6 of the sixth lens and the refractive index nd7 of the seventh lens satisfy the conditional expression: the absolute value of nd6-nd7 is less than or equal to 30 and less than or equal to 60.
According to one aspect of the present utility model, the abbe number vd6 of the sixth lens and the abbe number vd7 of the seventh lens satisfy the conditional expression: the |vd6-vd7| is less than or equal to 0.1 and less than or equal to 0.5.
According to one aspect of the utility model, the optical imaging system further comprises: a stop located between the fourth lens and the fifth lens.
According to one aspect of the present utility model, the total optical length TTL of the optical imaging system, the center thickness CT4 of the fourth lens, and the distance T4 between the image side surface of the fourth lens and the stop on the optical axis satisfy the following conditional expression: TTL/(T4+CT4) is less than or equal to 6.1 and less than or equal to 12.
According to one aspect of the present utility model, the focal length f2 of the second lens and the total focal length f of the optical imaging system satisfy the conditional expression: -5.8.ltoreq.f2/f.ltoreq.2.5.
According to one aspect of the present utility model, the focal length f3 of the third lens, the focal length f4 of the fourth lens, and the total focal length f of the optical imaging system satisfy the conditional expression: and (f 4-f 3)/f is more than or equal to 1.8 and less than or equal to 10.
According to one aspect of the present utility model, the focal length f5 of the fifth lens and the total focal length f of the optical imaging system satisfy the conditional expression: f5/f is more than or equal to 1.7 and less than or equal to 3.6.
According to one aspect of the present utility model, the focal length f6 of the sixth lens and the total focal length f of the optical imaging system satisfy the conditional expression: f6/f is more than or equal to 1.5 and less than or equal to 2.4.
According to one aspect of the present utility model, the focal length f7 of the seventh lens and the total focal length f of the optical imaging system satisfy the conditional expression: -1.6.ltoreq.f7/f.ltoreq.0.7.
According to one aspect of the present utility model, the center thickness CT6 of the sixth lens and the center thickness CT7 of the seventh lens satisfy the conditional expression: CT6/CT7 is less than or equal to 4.5 and less than or equal to 7.0.
According to one aspect of the present utility model, the focal length f8 of the eighth lens, the focal length f9 of the ninth lens, and the total focal length f of the optical imaging system satisfy the conditional expression: and (f8+f9)/f is more than or equal to 17.3 and less than or equal to 46.6.
According to one aspect of the present utility model, the front group focal length fa of the first lens to the fourth lens and the total focal length f of the optical imaging system satisfy the conditional expression: -3.8.ltoreq.fa/f.ltoreq.1.2.
According to one aspect of the present utility model, the rear group focal length fb of the fifth lens to the ninth lens and the total focal length f of the optical imaging system satisfy the conditional expression: fb/f is more than or equal to 1.8 and less than or equal to 2.8.
According to an aspect of the present utility model, the front group focal length fa of the first to fourth lenses and the rear group focal length fb of the fifth to ninth lenses satisfy the conditional expression: -1.6.ltoreq.fa/fb.ltoreq.0.3.
According to one aspect of the present utility model, a center distance D12 on the optical axis from the image side surface of the first lens element to the object side surface of the second lens element, a center distance D45 on the optical axis from the image side surface of the fourth lens element to the object side surface of the fifth lens element, and an optical total length TTL of the optical imaging system satisfy the following conditional expressions: and (D12+D45)/TTL is more than or equal to 0 and less than or equal to 0.2.
According to one aspect of the present utility model, the diameter D1 of the first lens and the total optical length TTL of the optical imaging system satisfy the conditional expression: D1/TTL is more than or equal to 0.3 and less than or equal to 0.8.
According to one aspect of the present utility model, the total optical length TTL of the optical imaging system and the total focal length f of the optical imaging system satisfy the conditional expression: TTL/f is more than or equal to 7.9 and less than or equal to 8.6.
According to one aspect of the present utility model, the back focal length BFL of the optical imaging system and the total optical length TTL of the optical imaging system satisfy the conditional expression: BFL/TTL is more than or equal to 0.1 and less than or equal to 0.2.
According to the scheme of the utility model, by adopting an optical framework of 9 lenses, and combining and collocating the lenses with different shapes, materials, refractive powers and specific parameters and setting different distances, thicknesses and the like, the ultra-wide angle optical imaging system also has the characteristics of large aperture, high resolution, small volume and light weight, and can realize the performance of no virtual focus in the high-low temperature process.
The field angle of the optical imaging system can reach 160 degrees, and the application of the optical imaging system in various scenes can be met, so that the market competitiveness is improved; the imaging target surface can reach 1/1.8', and the resolution power of the optical imaging system is up to thirty-five million pixels so as to meet the imaging requirement of high standards; the large aperture of FNO1.8 is realized, and the optical imaging system can have larger light quantity, so that a better night vision effect is realized; the incidence angle CRA of the chief ray is smaller than 18 degrees, so that the chief ray can be matched with a plurality of large target surface sensors, has wide application prospect and has higher market competitiveness; the optical imaging system can show high-definition image quality in a temperature range of-40 to 80 degrees by matching different materials of each lens.
Drawings
In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are required to be used in the embodiments will be briefly described below. It is evident that the drawings in the following description are only some embodiments of the present utility model and that other drawings may be obtained from these drawings without inventive effort for a person of ordinary skill in the art.
FIG. 1 schematically illustrates an optical architecture of an ultra-wide angle optical imaging system according to a first embodiment of the present utility model;
FIG. 2 schematically illustrates an optical architecture of an ultra-wide angle optical imaging system according to a second embodiment of the present utility model;
FIG. 3 schematically illustrates an optical architecture of an ultra-wide angle optical imaging system according to a third embodiment of the utility model;
fig. 4 schematically shows an optical architecture of an ultra-wide angle optical imaging system according to a fourth embodiment of the present utility model.
DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION
The description of the embodiments of this specification should be taken in conjunction with the accompanying drawings, which are a complete description of the embodiments. In the drawings, the shape or thickness of the embodiments may be enlarged and indicated simply or conveniently. Furthermore, portions of the structures in the drawings will be described in terms of separate descriptions, and it should be noted that elements not shown or described in the drawings are in a form known to those of ordinary skill in the art.
Any references to directions and orientations in the description of the embodiments herein are for convenience only and should not be construed as limiting the scope of the utility model in any way. The following description of the preferred embodiments will refer to combinations of features which may be present alone or in combination, and the utility model is not particularly limited to the preferred embodiments. The scope of the utility model is defined by the claims.
In the present embodiment, the paraxial region refers to a region near the optical axis. If the lens surface is convex and the convex position is not defined, then the lens surface is convex at least in the paraxial region; if the lens surface is concave and the concave position is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the subject is referred to as the object side of the lens, and the surface of each lens closest to the imaging side is referred to as the image side of the lens.
As shown in fig. 1, an optical imaging system with ultra-wide angle according to an embodiment of the present utility model includes: a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, and a ninth lens L9, which are sequentially arranged in the direction from the object side to the image side along the optical axis. Wherein the first, second and seventh lenses L1, L2 and L7 have negative optical power, the fourth, fifth, sixth, eighth and ninth lenses L4, L5, L6, L8 and L9 have positive optical power, and the third lens L3 has positive or negative optical power.
Regarding the lens shapes, the first lens element L1 and the second lens element L2 are convex-concave lenses, the image-side surface of the third lens element L3 is concave, the object-side surface of the fourth lens element L4 is convex or the fourth lens element L4 is concave-convex, the fifth lens element L5 and the sixth lens element L6 are convex-convex lenses, the seventh lens element L7 is concave-concave lens element, the object-side surface of the eighth lens element L8 is convex, and the image-side surface of the ninth lens element L9 is convex. The surface shape of the ninth lens L9 is an aspherical surface. The nine lenses are all glass lenses.
According to the embodiment of the present utility model, the focal length f1 of the first lens L1 and the total focal length f of the optical imaging system satisfy the conditional expression: -2.5.ltoreq.f1/f.ltoreq.1.6. The optical imaging system can receive light rays with larger angles under a certain caliber while ensuring the processability, so as to meet the requirement of ultra-large wide angle.
The optical imaging system further includes a cemented doublet formed by a sixth lens L6 and a seventh lens L7.
According to the scheme, the first lens L1 adopts a convex-concave shape, so that light rays with larger angles can be collected into the system, and a large field angle is realized. At the same time, the light is deflected to reduce the incident angle of the light entering the rear lens (the lens positioned at the image side of the first lens L1), so that the larger aberration caused by the light with a large incident angle is more favorable for reducing. The second lens L2 adopts a convex-concave shape, so that the larger negative focal power of the front lens (namely the first lens L1) can be shared, the sensitivity of the first lens L1 is reduced, and meanwhile, the light rays with larger angles are further deflected, so that the transmission of the rear lens (the lens positioned at the image side of the second lens L2) to the light rays is facilitated. According to one embodiment of the utility model, the third lens L3 is a biconcave negative focal power lens, which is favorable for balancing the incident angle of light rays, and increasing the aperture of light transmission so as to realize a larger aperture; according to another embodiment of the present utility model, the third lens L3 may be a positive power lens with convex-concave shape, which is beneficial to compensate the aberration such as curvature of field and chromatic aberration generated by the first lens L1 and the second lens L2, and reduce the pressure of aberration correction of the rear lens group (lens located at the image side of the third lens L3) of the third lens L3. According to an embodiment of the present utility model, the object-side surface of the fourth lens element L4 is convex, which is beneficial for smooth transition of light in the system, thereby reducing tolerance sensitivity and improving resolution. According to another embodiment of the present utility model, the fourth lens L4 has a concave-convex shape, which is beneficial to correcting the field curvature of the system so as to meet higher imaging requirements. The fifth lens L5 has positive focal power, which is favorable for correcting the chromatic aberration of the system so as to meet higher imaging requirements. The sixth lens L6 has a biconvex shape, which is favorable for depressing the large-angle light rays near the stop STO, so that more light rays enter the lens at the rear end (at the image side of the sixth lens L6); the sixth lens L6 of positive power and the seventh lens L7 of negative power are cemented to contribute to correction of chromatic aberration and achieve lower tolerance sensitivity. The eighth lens L8 has positive optical power, which is favorable for further correction of chromatic aberration so as to meet higher imaging requirements. The ninth lens L9 adopts an aspheric surface shape, is favorable for reducing the angle of the principal ray so as to match with the CRA curve of the chip, adopts a convex surface on the image side surface of the lens, is favorable for correcting the distortion of the edge field of view, and can better meet the imaging quality requirement.
Further, the combined focal length f67 of the sixth lens L6 and the seventh lens L7 and the total focal length f of the optical imaging system satisfy the conditional expression: -6.6.ltoreq.f67/f.ltoreq.4.0. Wherein the refractive index nd6 of the sixth lens L6 and the refractive index nd7 of the seventh lens L7 satisfy the conditional expression: the absolute value of nd6-nd7 is less than or equal to 30 and less than or equal to 60. The abbe number vd6 of the sixth lens L6 and the abbe number vd7 of the seventh lens L7 satisfy the conditional expression: the |vd6-vd7| is less than or equal to 0.1 and less than or equal to 0.5. The two lenses with positive and negative refractive power are matched to offset aberration generated by the two lenses, and the refractive indexes and the dispersion coefficients of the two lenses L6 and L7 are optimally matched by arranging the positive and negative lenses and arranging the combined focal length of the positive and negative lenses in the cemented lens and matching glass materials, so that the chromatic aberration of an optical imaging system can be effectively corrected, the resolving power of the system is improved, and the athermalization design of the lens is facilitated.
According to an embodiment of the present utility model, the optical imaging system further includes: a stop STO located between the fourth lens L4 and the fifth lens L5. Further, the optical total length TTL of the optical imaging system, the center thickness CT4 of the fourth lens L4, and the distance T4 between the image side surface of the fourth lens L4 and the stop STO on the optical axis satisfy the following conditional expression: TTL/(T4+CT4) is less than or equal to 6.1 and less than or equal to 12. The total optical length TTL of the optical imaging system in the embodiment of the present utility model refers to the distance between the object side surface of the first lens L1 and the imaging surface IMA of the optical lens on the optical axis. By reasonably increasing the distance between the diaphragm STO and the fourth lens L4 and the center thickness of the fourth lens L4, the light rays with different fields of view are scattered at a reasonable angle after being converged by the diaphragm STO, so that the light rays are converged at a more distant vertical axis position, and the imaging height of the optical lens is increased.
According to the embodiment of the present utility model, the focal length f2 of the second lens L2 and the total focal length f of the optical imaging system satisfy the conditional expression: -5.8.ltoreq.f2/f.ltoreq.2.5. The second lens L2 has proper negative focal power, so that light can enter the system more smoothly, the difficulty of aberration correction is reduced, and the resolving power of the optical lens is improved.
According to an embodiment of the present utility model, the focal length f3 of the third lens L3, the focal length f4 of the fourth lens L4, and the total focal length f of the optical imaging system satisfy the conditional expression: and (f 4-f 3)/f is more than or equal to 1.8 and less than or equal to 10. It is advantageous to expand the width of the bundle of rays so that the ingested high angle rays can be sufficiently transmitted to the rear optical system through the third lens L3 to obtain a wider field of view and a higher relative illuminance.
According to the embodiment of the present utility model, the focal length f5 of the fifth lens L5 and the total focal length f of the optical imaging system satisfy the conditional expression: f5/f is more than or equal to 1.7 and less than or equal to 3.6. By adjusting the focal length of the fifth lens L5 within the above range, the shape change of the fifth lens L5 can be alleviated, and since the fifth lens L5 is disposed behind the stop STO (on the image side of the stop STO), the aberration caused by the front lens group (i.e., the first to fourth lenses) can be better corrected, the advanced spherical aberration and coma aberration can be improved, and the realization of high resolution and uniform overall resolution can be facilitated.
According to the embodiment of the present utility model, the focal length f6 of the sixth lens L6 and the total focal length f of the optical imaging system satisfy the conditional expression: f6/f is more than or equal to 1.5 and less than or equal to 2.4. The sixth lens L6 has proper positive focal power, so that light convergence is facilitated, divergent light entering the system from the front smoothly enters the rear optical system, the trend of the whole light path is more gentle, aberration is optimized, and resolution is improved.
According to the embodiment of the present utility model, the focal length f7 of the seventh lens L7 and the total focal length f of the optical imaging system satisfy the conditional expression: -1.6.ltoreq.f7/f.ltoreq.0.7. The arrangement is favorable for reasonably distributing the whole refractive power of the optical lens, improves the imaging analytic power of the optical lens, and realizes high-pixel imaging of the optical lens.
According to the embodiment of the present utility model, the center thickness CT6 of the sixth lens L6 and the center thickness CT7 of the seventh lens L7 satisfy the conditional expression: CT6/CT7 is less than or equal to 4.5 and less than or equal to 7.0. The thickness sensitivity of the fixed focus lens can be reduced by controlling the center thickness of the sixth lens L6 and the seventh lens L7, and the field curvature and distortion of the optical system can be effectively corrected, so that the fixed focus optical system obtains good image quality in the full field of view.
According to an embodiment of the present utility model, the focal length f8 of the eighth lens L8, the focal length f9 of the ninth lens L9, and the total focal length f of the optical imaging system satisfy the conditional expression: and (f8+f9)/f is more than or equal to 17.3 and less than or equal to 46.6. Through reasonable setting of the optical power of the eighth lens and the optical power of the ninth lens, light rays can be properly dispersed, the imaging area of the lens can be increased, the image quality can be optimized, and the overall resolution of the lens can be improved.
According to the embodiment of the present utility model, the front group focal length fa of the first lens L1 to the fourth lens L4 and the total focal length f of the optical imaging system satisfy the conditional expression: -3.8.ltoreq.fa/f.ltoreq.1.2. The back group focal length fb of the fifth lens L5 to the ninth lens L9 and the total focal length f of the optical imaging system satisfy the conditional expression: fb/f is more than or equal to 1.8 and less than or equal to 2.8. The front group focal length fa of the first lens L1 to the fourth lens L4 and the rear group focal length fb of the fifth lens L5 to the ninth lens L9 satisfy the conditional expression: -1.6.ltoreq.fa/fb.ltoreq.0.3. The front group focal length fa is the combined focal length of the first, second, third and fourth lenses, and the back group focal length fb is the combined focal length of the fifth, sixth, seventh, eighth and ninth lenses. The focal length ratio among the groups is reasonably controlled, so that the front light can be smoothly converged to the vicinity of the optical axis, a good effect is achieved on the distortion correction of a large angle, meanwhile, the beam aberration and the field curvature outside the converging axis can be better, and a positive effect is achieved on the improvement of the edge image quality. The correction of the curvature of field generated by the lens group located in front of the stop STO (i.e., on the object side of the stop STO) is also facilitated, and the influence of curvature of field on the resolution is reduced.
According to an embodiment of the utility model, the center distance D12 on the optical axis from the image side surface of the first lens element L1 to the object side surface of the second lens element L2, the center distance D45 on the optical axis from the image side surface of the fourth lens element L4 to the object side surface of the fifth lens element L5, and the total optical length TTL of the optical imaging system satisfy the following conditional expressions: and (D12+D45)/TTL is more than or equal to 0 and less than or equal to 0.2. The positions of the first lens, the second lens, the fourth lens and the fifth lens in the optical imaging system and the distances between the lenses are adjusted, so that the optical imaging lens is guaranteed to have better quality, and meanwhile the overall size of the lens can be prevented from being too large, and further the lens is beneficial to achieving the characteristics of miniaturization and high image quality.
According to an embodiment of the present utility model, the diameter D1 of the first lens L1 and the total optical length TTL of the optical imaging system satisfy the conditional expression: D1/TTL is more than or equal to 0.3 and less than or equal to 0.8. The system can realize the characteristic of small volume by controlling the caliber and the total length of the lens head.
According to the embodiment of the present utility model, the optical total length TTL of the optical imaging system and the total focal length f of the optical imaging system satisfy the conditional expression: TTL/f is more than or equal to 7.9 and less than or equal to 8.6. The total length (namely the total length of the optical imaging system) TTL of the lens is shortened, the problem that the overall performance of the lens is poor due to the fact that the TTL/f ratio is too small is solved, and the use compatibility of the lens is improved.
According to the embodiment of the utility model, the back focal length BFL of the optical imaging system and the total optical length TTL of the optical imaging system satisfy the following conditional expression: BFL/TTL is more than or equal to 0.1 and less than or equal to 0.2. By controlling the ratio of the back focus to the total optical length, the interference between the lens and the chip caused by insufficient back focus can be avoided, and the imaging quality of the whole lens is prevented from being influenced.
In summary, according to the above scheme, the optical architecture of the 9 lenses is adopted, and the lenses with different shapes, materials, refractive powers and specific parameters are combined and matched, and different distances, thicknesses and the like are set, so that the ultra-wide angle optical imaging system also has the characteristics of large aperture, high resolution, small volume and light weight, and can realize the performance of no virtual focus in the high-low temperature process. Specifically, the field angle of the optical lens can reach 160 degrees, so that the application of the optical system in various scenes can be satisfied, and the market competitiveness is improved; the imaging target surface can reach 1/1.8', and the resolution power of the optical system is up to thirty-five million pixels so as to meet the imaging requirement of high standards; the large aperture of FNO1.8 is realized, and the optical imaging system can have larger light quantity, so that a better night vision effect is realized; the incidence angle CRA of the chief ray is smaller than 18 degrees, so that the chief ray can be matched with a plurality of large target surface sensors, has wide application prospect and has higher market competitiveness; through the collocation of different materials of each lens, the optical imaging system can show high-definition image quality within the temperature range of-40-80 degrees.
The ultra-wide angle optical imaging system of the present utility model is specifically described below in four embodiments with reference to the accompanying drawings and tables. In the following embodiments, the present utility model refers to the stop STO as one side, the parallel flat plate CG as two sides, the image plane IMA as one side, and the bonding surface of the doublet as one side.
The parameters of the respective examples specifically satisfying the above conditional expression are shown in the following table 1:
TABLE 1
In an embodiment of the present utility model, the aspherical lens of the ultra-wide angle optical imaging system satisfies the following formula:
in the above formula, z is the axial distance from the curved surface to the vertex at the position with the height h perpendicular to the optical axis along the optical axis direction; c represents the curvature at the apex of the aspherical curved surface; k is a conic coefficient; a is that 4 、A 6 、A 8 、A 10 、A 12 、A 14 、A 16 The fourth order, sixth order, eighth order, tenth order, fourteenth order, sixteen order, respectively, are aspherical coefficients.
Example 1
Referring to fig. 1, in the present embodiment, a first lens L1 has negative power, a second lens L2 has negative power, a third lens L3 has negative power, a fourth lens L4 has positive power, a fifth lens L5 has positive power, a sixth lens L6 has positive power, a seventh lens L7 has negative power, an eighth lens L8 has positive power, and a ninth lens L9 has positive power. The stop STO is located between the fourth lens L4 and the fifth lens L5.
Along the direction from the object side to the image side of the optical axis, the first lens L1 is a convex-concave lens, the second lens L2 is a convex-concave lens, the third lens L3 is a concave-concave lens, the fourth lens L4 is a convex-convex lens, the fifth lens L5 is a convex-convex lens, the sixth lens L6 is a convex-convex lens, the seventh lens L7 is a concave-concave lens, the eighth lens L8 is a convex-concave lens, and the ninth lens L9 is a convex-convex lens.
The second lens L2, the fourth lens L4, the fifth lens L5, and the ninth lens L9 are all aspherical lenses.
The present embodiment includes a cemented doublet formed by a sixth lens L6 and a seventh lens L7.
The relevant parameters of each lens in the ultra-wide angle optical imaging system of the present embodiment include: surface number (Surf), surface Type (Type), radius of curvature (Radius), thickness (Thickness), refractive index (Nd) of the material, and abbe number (Vd), as shown in table 2 below.
TABLE 2
The aspherical coefficients of each aspherical lens of the ultra-wide angle optical imaging system of the present embodiment include: the quadric constant K and the fourth-order aspheric coefficient A of the surface 4 Aspheric coefficient A of six orders 6 Eighth order aspheric coefficient A 8 Tenth order aspherical coefficient A 10 And twelve-order aspheric coefficient A 12 As shown in table 3 below.
| Surf | K | A 4 | A 6 | A 8 | A 10 | A 12 |
| 3 | 0.00 | 9.71E-03 | -7.63E-04 | 7.73E-05 | -4.80E-06 | 1.51E-07 |
| 4 | 0.00 | 1.20E-02 | -7.71E-04 | 1.06E-04 | -9.64E-06 | 4.67E-07 |
| 7 | 0.16 | 1.62E-04 | -7.32E-06 | -3.52E-05 | 5.30E-06 | -4.66E-07 |
| 8 | 0.00 | 1.27E-03 | 2.57E-04 | -3.84E-05 | 3.89E-06 | -3.49E-07 |
| 10 | 0.62 | -2.12E-03 | 2.91E-04 | -3.79E-05 | 3.37E-06 | -8.37E-08 |
| 11 | -0.34 | 8.96E-04 | 3.32E-05 | 4.01E-06 | 1.07E-07 | 8.75E-08 |
| 17 | 0.00 | 9.94E-04 | 3.35E-05 | -1.49E-06 | -1.77E-08 | 2.50E-09 |
| 18 | 0.00 | 3.35E-03 | -1.15E-05 | 4.98E-06 | -4.82E-07 | 1.28E-08 |
TABLE 3 Table 3
Referring to fig. 1 and the above tables 1 to 3, the angle of view of the ultra-wide angle optical imaging system in this embodiment may reach 160 °, the imaging target surface may reach 1/1.8", the resolution power may reach three thousand five million pixels, the chief ray incident angle CRA is smaller than 18 °, and the large aperture of FNO1.8 is realized, so that the optical imaging system may have a larger light flux, thereby realizing a better night vision effect. And can also realize high-definition image quality in a temperature range of-40 to 80 degrees.
Example two
Referring to fig. 2, in the present embodiment, the first lens L1 has negative power, the second lens L2 has negative power, the third lens L3 has positive power, the fourth lens L4 has positive power, the fifth lens L5 has positive power, the sixth lens L6 has positive power, the seventh lens L7 has negative power, the eighth lens L8 has positive power, and the ninth lens L9 has positive power. The stop STO is located between the fourth lens L4 and the fifth lens L5.
Along the direction from the object side to the image side of the optical axis, the first lens L1 is a convex-concave lens, the second lens L2 is a convex-concave lens, the third lens L3 is a convex-concave lens, the fourth lens L4 is a convex-concave lens, the fifth lens L5 is a convex-convex lens, the sixth lens L6 is a convex-convex lens, the seventh lens L7 is a concave-concave lens, the eighth lens L8 is a convex-convex lens, and the ninth lens L9 is a concave-convex lens.
The second lens L2, the third lens L3, the fifth lens L5, and the ninth lens L9 are all aspherical lenses.
The present embodiment includes a cemented doublet formed by a sixth lens L6 and a seventh lens L7.
The relevant parameters of each lens in the ultra-wide angle optical imaging system of the present embodiment include: surface number (Surf), surface Type (Type), radius of curvature (Radius), thickness (Thickness), refractive index (Nd) of the material, and abbe number (Vd), as shown in table 4 below.
TABLE 4 Table 4
The aspheric lens of the ultra-wide angle optical imaging system of the embodiment is asphericA face factor comprising: the quadric constant K and the fourth-order aspheric coefficient A of the surface 4 Aspheric coefficient A of six orders 6 Eighth order aspheric coefficient A 8 Tenth order aspherical coefficient A 10 Twelve-order aspheric coefficient A 12 And fourteen-order aspheric coefficient a 14 As shown in table 5 below.
TABLE 5
Referring to fig. 2 and tables 1, 4 and 5, the angle of view of the ultra-wide angle optical imaging system in this embodiment may reach 160 °, the imaging target surface may reach 1/1.8", the resolution power may reach three thousand five million pixels, the chief ray incident angle CRA is smaller than 18 °, and the large aperture of FNO1.8 is realized, so that the optical imaging system may have a larger light flux, thereby realizing a better night vision effect. And can also realize high-definition image quality in a temperature range of-40 to 80 degrees.
Example III
Referring to fig. 3, in the present embodiment, the first lens L1 has negative power, the second lens L2 has negative power, the third lens L3 has positive power, the fourth lens L4 has positive power, the fifth lens L5 has positive power, the sixth lens L6 has positive power, the seventh lens L7 has negative power, the eighth lens L8 has positive power, and the ninth lens L9 has positive power. The stop STO is located between the fourth lens L4 and the fifth lens L5.
Along the direction from the object side to the image side of the optical axis, the first lens L1 is a convex-concave lens, the second lens L2 is a convex-concave lens, the third lens L3 is a convex-concave lens, the fourth lens L4 is a convex-concave lens, the fifth lens L5 is a convex-convex lens, the sixth lens L6 is a convex-convex lens, the seventh lens L7 is a concave-concave lens, the eighth lens L8 is a convex-convex lens, and the ninth lens L9 is a concave-convex lens.
The second lens L2, the third lens L3, the fifth lens L5, and the ninth lens L9 are all aspherical lenses.
The present embodiment includes a cemented doublet formed by a sixth lens L6 and a seventh lens L7.
The relevant parameters of each lens in the ultra-wide angle optical imaging system of the present embodiment include: surface number (Surf), surface Type (Type), radius of curvature (Radius), thickness (Thickness), refractive index (Nd) of the material, and abbe number (Vd), as shown in table 6 below.
TABLE 6
The aspherical coefficients of each aspherical lens of the ultra-wide angle optical imaging system of the present embodiment include: the quadric constant K and the fourth-order aspheric coefficient A of the surface 4 Aspheric coefficient A of six orders 6 Eighth order aspheric coefficient A 8 Tenth order aspherical coefficient A 10 Twelve-order aspheric coefficient A 12 And fourteen-order aspheric coefficient a 14 As shown in table 7 below.
| Surf | K | A 4 | A 6 | A 8 | A 10 | A 12 | A 14 |
| 3 | -2.10 | 7.53E-03 | -9.26E-04 | 5.32E-05 | -1.35E-06 | 5.45E-08 | 0.00E+00 |
| 4 | -0.17 | 5.25E-03 | -1.12E-03 | -8.66E-05 | 1.00E-05 | -5.83E-07 | 0.00E+00 |
| 5 | 9.79 | 6.58E-03 | 2.49E-04 | -4.25E-05 | -8.12E-07 | -7.88E-07 | 0.00E+00 |
| 6 | 90.00 | 1.07E-02 | 6.88E-04 | 1.12E-05 | 7.88E-06 | -6.57E-06 | 0.00E+00 |
| 10 | 59.54 | 2.96E-03 | 9.35E-05 | 1.31E-05 | -1.80E-06 | 2.10E-07 | 2.82E-09 |
| 11 | 0.38 | 1.80E-03 | -2.57E-05 | 4.01E-05 | -1.84E-06 | -2.28E-07 | 4.89E-08 |
| 17 | 3.47 | -3.41E-03 | 2.53E-06 | -2.17E-05 | 3.26E-06 | -7.04E-08 | 0.00E+00 |
| 18 | -12.49 | -4.10E-03 | 1.53E-04 | -1.58E-05 | 1.56E-06 | -3.82E-08 | 0.00E+00 |
TABLE 7
Referring to fig. 3 and the above tables 1, 6 and 7, the angle of view of the ultra-wide angle optical imaging system in this embodiment may reach 160 °, the imaging target surface may reach 1/1.8", the resolution power may reach three thousand five million pixels, the chief ray incident angle CRA is smaller than 18 °, and the large aperture of FNO1.8 is realized, so that the optical imaging system may have a larger light flux, thereby realizing a better night vision effect. And can also realize high-definition image quality in a temperature range of-40 to 80 degrees.
Example IV
Referring to fig. 4, in the present embodiment, the first lens L1 has negative power, the second lens L2 has negative power, the third lens L3 has negative power, the fourth lens L4 has positive power, the fifth lens L5 has positive power, the sixth lens L6 has positive power, the seventh lens L7 has negative power, the eighth lens L8 has positive power, and the ninth lens L9 has positive power. The stop STO is located between the fourth lens L4 and the fifth lens L5.
Along the direction from the object side to the image side of the optical axis, the first lens L1 is a convex-concave lens, the second lens L2 is a convex-concave lens, the third lens L3 is a concave-concave lens, the fourth lens L4 is a convex-concave lens, the fifth lens L5 is a convex-convex lens, the sixth lens L6 is a convex-convex lens, the seventh lens L7 is a concave-concave lens, the eighth lens L8 is a convex-convex lens, and the ninth lens L9 is a convex-convex lens.
The second lens L2, the fourth lens L4, the fifth lens L5, and the ninth lens L9 are all aspherical lenses.
The present embodiment includes a cemented doublet formed by a sixth lens L6 and a seventh lens L7.
The relevant parameters of each lens in the ultra-wide angle optical imaging system of the present embodiment include: surface number (Surf), surface Type (Type), radius of curvature (Radius), thickness (Thickness), refractive index (Nd) of the material, and abbe number (Vd), as shown in table 8 below.
TABLE 8
The aspherical coefficients of each aspherical lens of the ultra-wide angle optical imaging system of the present embodiment include: the quadric constant K and the fourth-order aspheric coefficient A of the surface 4 Aspheric coefficient A of six orders 6 Eighth order aspheric coefficient A 8 Tenth order aspherical coefficient A 10 And twelve-order aspheric coefficient A 12 As shown in table 9 below.
| Surf | K | A 4 | A 6 | A 8 | A 10 | A 12 |
| 3 | -12.84 | 1.00E-02 | -8.96E-04 | 9.01E-05 | -5.36E-06 | 1.52E-07 |
| 4 | -28.46 | 1.87E-02 | -2.31E-03 | 2.98E-04 | -2.33E-05 | 8.10E-07 |
| 7 | 0.34 | -8.40E-04 | 4.58E-06 | -9.18E-06 | 7.81E-07 | -6.15E-08 |
| 8 | 0.00 | 1.15E-03 | 8.21E-05 | -1.75E-06 | -1.19E-06 | -2.06E-08 |
| 10 | -1.02 | 2.78E-04 | 2.06E-04 | -1.70E-05 | 1.21E-06 | -2.00E-08 |
| 11 | 0.10 | 6.77E-04 | 4.58E-05 | 2.75E-06 | 1.10E-06 | -8.21E-09 |
| 17 | 59.85 | -5.48E-03 | -4.68E-04 | 4.72E-05 | -6.78E-06 | 3.70E-07 |
| 18 | 43.71 | -4.12E-03 | -3.09E-04 | 3.15E-05 | -2.21E-06 | 7.89E-08 |
TABLE 9
Referring to fig. 4 and the above tables 1, 8 and 9, the angle of view of the ultra-wide angle optical imaging system in this embodiment may reach 160 °, the imaging target surface may reach 1/1.8", the resolution power may reach three thousand five million pixels, the chief ray incident angle CRA is smaller than 18 °, and the large aperture of FNO1.8 is realized, so that the optical imaging system may have a larger light flux, thereby realizing a better night vision effect. And can also realize high-definition image quality in a temperature range of-40 to 80 degrees.
The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the utility model.
Claims (20)
1. An optical imaging system, comprising: a first lens (L1), a second lens (L2), a third lens (L3), a fourth lens (L4), a fifth lens (L5), a sixth lens (L6), a seventh lens (L7), an eighth lens (L8), and a ninth lens (L9) which are arranged in this order along the optical axis from the object side to the image side, the first lens (L1), the second lens (L2), and the seventh lens (L7) having negative optical power, the fourth lens (L4), the fifth lens (L5), the sixth lens (L6), the eighth lens (L8), and the ninth lens (L9) having positive optical power, characterized in that the third lens (L3) has positive optical power or negative optical power;
the first lens (L1) and the second lens (L2) are convex-concave lenses, the image side surface of the third lens (L3) is concave, the fourth lens (L4) is a convex lens or the object side surface is convex, the fifth lens (L5) and the sixth lens (L6) are convex-convex lenses, the seventh lens (L7) is a concave-concave lens, the object side surface of the eighth lens (L8) is convex, and the image side surface of the ninth lens (L9) is convex;
the focal length f1 of the first lens (L1) and the total focal length f of the optical imaging system satisfy the conditional expression: -2.5.ltoreq.f1/f.ltoreq.1.6.
2. The optical imaging system according to claim 1, wherein the sixth lens (L6) and the seventh lens (L7) are cemented as a cemented doublet.
3. The optical imaging system according to claim 1 or 2, wherein a combined focal length f67 of the sixth lens (L6), the seventh lens (L7), and a total focal length f of the optical imaging system satisfy a conditional expression: -6.6.ltoreq.f67/f.ltoreq.4.0.
4. The optical imaging system according to claim 1 or 2, wherein a refractive index nd6 of the sixth lens (L6) and a refractive index nd7 of the seventh lens (L7) satisfy the conditional expression: the absolute value of nd6-nd7 is less than or equal to 30 and less than or equal to 60.
5. The optical imaging system according to claim 1 or 2, characterized in that the abbe number vd6 of the sixth lens (L6) and the abbe number vd7 of the seventh lens (L7) satisfy the conditional expression: the |vd6-vd7| is less than or equal to 0.1 and less than or equal to 0.5.
6. The optical imaging system according to claim 1 or 2, characterized in that an optical total length TTL of the optical imaging system, a center thickness CT4 of the fourth lens (L4) and a distance T4 of an image side surface of the fourth lens (L4) to a Stop (STO) on the optical axis satisfy the conditional expression: TTL/(T4+CT4) is less than or equal to 6.1 and less than or equal to 12.
7. The optical imaging system according to claim 1 or 2, characterized in that the focal length f2 of the second lens (L2) and the total focal length f of the optical imaging system satisfy the conditional expression: -5.8.ltoreq.f2/f.ltoreq.2.5.
8. The optical imaging system according to claim 1 or 2, wherein a focal length f3 of the third lens (L3), a focal length f4 of the fourth lens (L4), and a total focal length f of the optical imaging system satisfy a conditional expression: and (f 4-f 3)/f is more than or equal to 1.8 and less than or equal to 10.
9. The optical imaging system according to claim 1 or 2, characterized in that a focal length f5 of the fifth lens (L5) and a total focal length f of the optical imaging system satisfy the conditional expression: f5/f is more than or equal to 1.7 and less than or equal to 3.6.
10. The optical imaging system according to claim 1 or 2, characterized in that a focal length f6 of the sixth lens (L6) and a total focal length f of the optical imaging system satisfy the conditional expression: f6/f is more than or equal to 1.5 and less than or equal to 2.4.
11. The optical imaging system according to claim 1 or 2, characterized in that a focal length f7 of the seventh lens (L7) and a total focal length f of the optical imaging system satisfy the conditional expression: -1.6.ltoreq.f7/f.ltoreq.0.7.
12. The optical imaging system according to claim 1 or 2, wherein a center thickness CT6 of the sixth lens (L6) and a center thickness CT7 of the seventh lens (L7) satisfy the conditional expression: CT6/CT7 is less than or equal to 4.5 and less than or equal to 7.0.
13. The optical imaging system according to claim 1 or 2, wherein a focal length f8 of the eighth lens (L8), a focal length f9 of the ninth lens (L9), and a total focal length f of the optical imaging system satisfy a conditional expression: and (f8+f9)/f is more than or equal to 17.3 and less than or equal to 46.6.
14. The optical imaging system according to claim 1 or 2, wherein a combined focal length fa of the first lens (L1) to the fourth lens (L4) and a total focal length f of the optical imaging system satisfy a conditional expression: -3.8.ltoreq.fa/f.ltoreq.1.2.
15. The optical imaging system according to claim 1 or 2, wherein a combined focal length fb of the fifth lens (L5) to the ninth lens (L9) and a total focal length f of the optical imaging system satisfy a conditional expression: fb/f is more than or equal to 1.8 and less than or equal to 2.8.
16. The optical imaging system according to claim 1 or 2, wherein a combined focal length fa of the first lens (L1) to the fourth lens (L4) and a combined focal length fb of the fifth lens (L5) to the ninth lens (L9) satisfy a conditional expression: -1.6.ltoreq.fa/fb.ltoreq.0.3.
17. The optical imaging system according to claim 1 or 2, wherein a center distance D12 on the optical axis from the image side surface of the first lens (L1) to the object side surface of the second lens (L2), a center distance D45 on the optical axis from the image side surface of the fourth lens (L4) to the object side surface of the fifth lens (L5), and an optical total length TTL of the optical imaging system satisfy the conditional expression: and (D12+D45)/TTL is more than or equal to 0 and less than or equal to 0.2.
18. The optical imaging system according to claim 1 or 2, characterized in that the diameter D1 of the first lens (L1) and the total optical length TTL of the optical imaging system satisfy the conditional expression: D1/TTL is more than or equal to 0.3 and less than or equal to 0.8.
19. The optical imaging system according to claim 1 or 2, wherein the total optical length TTL of the optical imaging system and the total focal length f of the optical imaging system satisfy the conditional expression: TTL/f is more than or equal to 7.9 and less than or equal to 8.6.
20. The optical imaging system according to claim 1 or 2, wherein a back focal length BFL of the optical imaging system and an optical total length TTL of the optical imaging system satisfy the conditional expression: BFL/TTL is more than or equal to 0.1 and less than or equal to 0.2.
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