CN117233938B - Optical lens - Google Patents
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- CN117233938B CN117233938B CN202311499559.9A CN202311499559A CN117233938B CN 117233938 B CN117233938 B CN 117233938B CN 202311499559 A CN202311499559 A CN 202311499559A CN 117233938 B CN117233938 B CN 117233938B
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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 concave image-side surface; the object side surface of the third lens is a concave surface, and the image side surface of the third lens is a convex surface; a fourth lens having positive optical power, the image-side surface of which is convex; a fifth lens element with positive refractive power having a convex object-side surface and a concave image-side surface; a sixth lens element with negative refractive power having a convex object-side surface and a concave image-side surface; a seventh lens element with positive refractive power having a convex object-side surface and a convex image-side surface; an eighth lens element with negative refractive power having a concave object-side surface and a concave image-side surface; the object side surface of the ninth lens is a convex surface, and the image side surface of the ninth lens is a concave surface. The optical lens provided by the invention has the characteristics of super wide angle, small distortion and high pixel.
Description
Technical Field
The invention relates to the technical field of imaging lenses, in particular to an optical lens.
Background
At present, with the improvement of shooting requirements of people, the common optical lens cannot meet imaging requirements of people, and people need a lens capable of realizing ultra-large-angle shooting urgently, so that the fisheye lens can be well met; because of the ultra-wide-angle shooting characteristic of the fish-eye lens, the real shot picture can accommodate more and wider sceneries, and can meet the picture shooting of a large scene range, so that the fish-eye lens is widely applied to the shooting fields of moving cameras, unmanned aerial vehicles, panoramic monitoring and the like.
However, the conventional fisheye lens generally has the problems that edge compression is large to cause degradation of resolution of a peripheral view field, and distortion of the edge is large to cause serious image distortion, so that the current requirement of large wide-angle high-definition shooting cannot be met.
Disclosure of Invention
Therefore, the present invention is directed to an optical lens with at least the advantages of ultra-wide angle, small distortion and high pixel to satisfy the image capturing requirements of consumers.
The embodiment of the invention realizes the aim through the following technical scheme.
The invention provides an optical lens, which consists of nine lenses, and sequentially comprises the following components 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 concave image-side surface; the object side surface of the third lens is a concave surface, and the image side surface of the third lens is a convex surface; a fourth lens having positive optical power, the image-side surface of which is convex; a fifth lens element with positive refractive power having a convex object-side surface and a concave image-side surface; a sixth lens element with negative refractive power having a convex object-side surface and a concave image-side surface; a seventh lens element with positive refractive power having a convex object-side surface and a convex image-side surface; an eighth lens element with negative refractive power having a concave object-side surface and a concave image-side surface; a ninth lens element with optical power having a convex object-side surface and a concave image-side surface; wherein, the optical lens satisfies the conditional expression: -1< f12/f34< -0.2, f12 representing the combined focal length of the first and second lenses, f34 representing the combined focal length of the third and fourth lenses.
Compared with the prior art, the optical lens provided by the invention adopts nine lenses with specific shapes and uses specific focal power combination, so that the lens has a compact structure and a large imaging surface, has an oversized view angle, can effectively reduce distortion of an edge view field, has higher image reduction degree in the whole view field, and can better meet the requirements of ultra-wide angle, small distortion and high pixels; meanwhile, the lens has better thermal stability, high-definition imaging of the lens in high-low temperature environments can be realized, and applicability of the lens in different application occasions is improved.
Drawings
The foregoing and/or additional aspects and advantages of the invention will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:
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 distortion curves of an optical lens according to a first embodiment of the present invention;
FIG. 4 is a graph showing axial chromatic aberration of an optical lens according to a first embodiment of the present invention;
FIG. 5 is a graph showing a vertical axis chromatic aberration curve of an optical lens according to a first embodiment of the present invention;
FIG. 6 is a schematic diagram of an optical lens according to a second embodiment of the present invention;
FIG. 7 is a graph showing a field curvature of an optical lens according to a second embodiment of the present invention;
FIG. 8 is a graph showing distortion curves of an optical lens according to a second embodiment of the present invention;
FIG. 9 is a graph showing axial chromatic aberration of an optical lens according to a second embodiment of the present invention;
FIG. 10 is a graph of a vertical axis chromatic aberration curve of an optical lens according to a second embodiment of the present invention;
FIG. 11 is a schematic diagram of an optical lens according to a third embodiment of the present invention;
FIG. 12 is a graph showing a field curvature of an optical lens according to a third embodiment of the present invention;
FIG. 13 is a graph showing distortion curves of an optical lens according to a third embodiment of the present invention;
FIG. 14 is a graph showing axial chromatic aberration of an optical lens according to a third embodiment of the present invention;
fig. 15 is a vertical axis chromatic aberration diagram of an optical lens according to a third embodiment of the present invention.
Detailed Description
In order that the objects, features and advantages of the invention will be readily understood, a more particular description of the invention will be rendered by reference to specific embodiments thereof which are illustrated in 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.
In this context, near the optical axis means the area near the optical axis. If the lens surface is convex and the convex position is not defined, it means that 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.
It will be further understood that the terms "comprises," "comprising," "includes," "including," "having," "containing," and/or "including," when used in this specification, specify the presence of stated features, elements, and/or components, but do not preclude the presence or addition of one or more other features, elements, components, and/or groups thereof. Furthermore, the term "exemplary" is intended to mean exemplary or illustrative.
It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other. The present application will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
The invention provides an optical lens, which consists of nine lenses, and sequentially comprises the following components from an object side to an imaging surface along an optical axis: the optical centers of the first lens, the second lens, the third lens, the fourth lens, the diaphragm, the fifth lens, the sixth lens, the seventh lens, the eighth lens and the ninth lens are positioned on the same straight line.
The first lens has negative focal power, the object side surface is a convex surface, and the image side surface is a concave surface.
The second lens has negative focal power, the object side surface is concave, and the image side surface is concave.
The third lens has positive focal power, the object side surface is concave, and the image side surface is convex.
The fourth lens has positive focal power, and the image side surface of the fourth lens is a convex surface.
The fifth lens has positive focal power, the object side surface of the fifth lens is a convex surface, and the image side surface of the fifth lens is a concave surface.
The sixth lens element has negative refractive power, wherein an object-side surface thereof is convex, and an image-side surface thereof is concave.
The seventh lens has positive focal power, wherein an object side surface of the seventh lens is a convex surface, and an image side surface of the seventh lens is a convex surface.
The eighth lens element has negative refractive power, wherein an object-side surface thereof is concave, and an image-side surface thereof is concave.
The ninth lens has optical power, wherein an object side surface of the ninth lens is a convex surface, and an image side surface of the ninth lens is a concave surface.
In some embodiments, a diaphragm for limiting a light beam may be disposed between the fourth lens and the fifth lens, and the diaphragm is disposed on an object side surface of the fifth lens, so that not only can the generation of ghost images of the optical lens be reduced, but also the range of light rays emitted from the front end of the optical lens can be converged, and the caliber of the rear end of the optical lens can be reduced.
In some embodiments, the optical lens comprises at least one glass lens and one plastic lens, and adopts a glass-plastic mixed lens structure, so that the volume and weight of the lens are effectively reduced, the resolution of the whole lens is improved, the distortion and aberration correction difficulty is reduced, the view angle and the image quality are effectively balanced, and the imaging stability of the lens in a high-low temperature environment is ensured.
In some embodiments, the optical lens satisfies the following conditional expression:
-1<f12/f34<-0.2；
where f12 denotes a combined focal length of the first lens and the second lens, and f34 denotes a combined focal length of the third lens and the fourth lens. The lens system has the advantages that the focal power relation of the lens group before the diaphragm is reasonably set, so that the large-view-field light rays entering the system can be effectively converged, the large-view-field angle is realized, meanwhile, the correction difficulty of aberration and distortion is reduced, and the ultra-wide angle and high-pixel imaging of the lens are realized.
In some embodiments, the optical lens satisfies the following conditional expression:
-0.1<(IH-f×θ)/IH<-0.02；
1.5<IH/f<1.8；
wherein θ represents a maximum half field angle of the optical lens, IH represents an image height corresponding to the maximum half field angle of the optical lens, and f represents an effective focal length of the optical lens. The above conditions are satisfied, so that the lens has an ultra-large field angle, distortion of the field of view at the edge of the lens is effectively corrected, and the ultra-wide angle, small distortion and high pixel balance of the lens are realized.
In some embodiments, the optical lens satisfies the following conditional expression:
8<TTL/f<9；
wherein TTL represents the total optical length of the optical lens, and f represents the effective focal length of the optical lens. The total length of the lens can be effectively limited by meeting the above conditions, and miniaturization of the optical lens can be better realized.
In some embodiments, the optical lens satisfies the following conditional expression:
-10<f1/f<-3；
0.8<f1/f2<2.0；
wherein f1 represents the focal length of the first lens, f2 represents the focal length of the second lens, and f represents the effective focal length of the optical lens. The lens has the advantages that the conditions are met, the negative focal power ratio of the first lens and the second lens is reasonably set, incident light entering the system can be converged rapidly, light entering the optical system in a larger range is facilitated, the ultra-wide-angle characteristic of the lens is achieved, the optical lens is facilitated to acquire more scene information, the requirement of large-range shooting is met, meanwhile, the correction difficulty of system distortion can be reduced, and small distortion of the lens is facilitated to be achieved.
In some embodiments, the optical lens satisfies the following conditional expression:
-4.5<f2/f<-2.6；
-5<R4/R3<0；
wherein f2 represents a focal length of the second lens, f represents an effective focal length of the optical lens, R3 represents a radius of curvature of an object side surface of the second lens, and R4 represents a radius of curvature of an image side surface of the second lens. The second lens 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.
In some embodiments, the optical lens satisfies the following conditional expression:
5.5<f3/f<30；
2.5<f4/f<4；
wherein f3 represents a focal length of the third lens, f4 represents a focal length of the fourth lens, and f represents an effective focal length of the optical lens. The focusing lens has the advantages that the focusing ratio of the third lens and the fourth lens is reasonably set, so that light convergence is facilitated, divergent light entering the system before smoothly enters the rear optical system, the trend of the whole light path is more gentle, the distortion correction difficulty is reduced, and the whole imaging quality is improved.
In some embodiments, the optical lens satisfies the following conditional expression:
2.5<f5/f<5；
-4<f6/f<-1；
wherein f5 denotes a focal length of the fifth lens, f6 denotes a focal length of the sixth lens, and f denotes an effective focal length of the optical lens. The focal length ratio of the fifth lens and the sixth lens is reasonably set, so that aberration caused by the front lens can be corrected, f-Theta distortion is reduced, spatial angle resolution is improved, and distortion degree of an edge image is reduced.
In some embodiments, the optical lens satisfies the following conditional expression:
1<f7/f<1.9；
-5<f8/f<-1.5；
-1<f7/f8<-0.5；
wherein f7 denotes a focal length of the seventh lens, f8 denotes a focal length of the eighth lens, and f denotes an effective focal length of the optical lens. The conditions are met, the light rays of the edge view field can be effectively converged, the distortion correction difficulty and sensitivity of the lens are effectively reduced, and the overall imaging quality is improved.
In some embodiments, the optical lens satisfies the following conditional expression:
0.3<R17/R18<3；
where f9 denotes a focal length of the ninth lens, R17 denotes a radius of curvature of an object side surface of the ninth lens, and R18 denotes a radius of curvature of an image side surface of the ninth lens. The above conditions are satisfied, so that the ninth lens bears smaller focal power, the front lens can be better matched to effectively correct the aberration, and meanwhile, the incident angle entering the image surface can be increased, thereby being beneficial to realizing the large target surface imaging of the lens.
In some embodiments, the optical lens satisfies the following conditional expression:
1.5<f567/f<2.5；
where f represents an effective focal length of the optical lens, and f567 represents a combined focal length of the fifth lens, the sixth lens, and the seventh lens. The focal length ratio of the lens group behind the diaphragm is reasonably configured to help strengthen the coma correction of the off-axis visual field, and well converge curvature of field and aberration, so that the lens has higher resolving power.
In some embodiments, the optical lens satisfies the following conditional expression:
5<DM1/DM5<7.5；
wherein DM1 represents the maximum effective aperture of the first lens, and DM5 represents the maximum effective aperture of the fifth lens. The front end of the lens has larger caliber, which is beneficial to the light in a larger range to enter the optical system, thus realizing the ultra-wide angle characteristic of the lens, effectively controlling the size of the rear end of the lens and realizing the balance of the ultra-wide angle and small volume of the lens.
In some embodiments, the optical lens satisfies the following conditional expression:
-0.01<f/f56<0.1；
where f represents an effective focal length of the optical lens, and f56 represents a combined focal length of the fifth lens and the sixth lens. The eccentric sensitivity of the fifth lens and the eccentric sensitivity of the sixth lens can be reasonably shared by the fifth lens and the sixth lens, and the overall optimization space of the optical lens can be improved, so that the optical performance of the optical lens can be further improved, and the Gao Qingcheng image of the optical lens can be realized.
In some embodiments, the optical lens satisfies the following conditional expression:
0.15<(CT3+CT34+CT4)/TTL<0.3；
wherein TTL represents the total optical length of the optical lens, CT3 represents the center thickness of the third lens, CT34 represents the air gap between the third lens and the fourth lens on the optical axis, and CT4 represents the center thickness of the fourth lens. The system resources can be reasonably allocated, the resource occupation of the optical system before the diaphragm is reduced, and the optimization space of the optical system after the diaphragm is improved, so that the imaging quality is improved.
In some embodiments, the optical lens satisfies the following conditional expression:
0.15<SAG82/CT8<0.8；
where SAG82 represents the edge sagittal height of the image side of the eighth lens, and CT8 represents the center thickness of the eighth lens. The edge rise of the eighth lens can be effectively controlled by meeting the conditions, so that the aberration of an edge view field can be effectively corrected, and the imaging quality is improved.
In the embodiment, the field angle of the optical lens can reach 180-220 degrees, so that ultra-large wide-angle imaging of the lens is realized.
As an implementation mode, the nine lenses in the optical lens can be plastic lenses or glass lenses, or a glass-plastic mixed material collocation structure can be adopted, specifically, the first lens and the fourth lens are glass lenses, the second lens, the third lens, the fifth lens, the sixth lens, the seventh lens, the eighth lens and the ninth lens are plastic aspheric lenses, and the optical lens can have good imaging effect while realizing ultra wide angle, small distortion and high pixel of the optical lens.
In various embodiments of the present invention, when the lens in the optical lens is an aspherical lens, the aspherical surface profile of the lens satisfies the following equation:
wherein z is the distance sagittal height from the aspherical surface vertex when the aspherical surface is at a position of height h along the optical axis direction, c is the paraxial radius of curvature of the surface, k is the quadric surface coefficient, A 2i The aspherical surface profile coefficient of the 2 i-th order.
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 S21 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, the eighth lens L8, the ninth lens L9, and the filter G1.
The first lens element L1 has negative refractive power, wherein an object-side surface S1 of the first lens element is convex, and an image-side surface S2 of the first lens element is concave.
The second lens L2 has negative optical power, the object-side surface S3 of the second lens is concave, and the image-side surface S4 of the second lens is concave.
The third lens element L3 has positive refractive power, wherein an object-side surface S5 of the third lens element is concave, and an image-side surface S6 of the third lens element is convex.
The fourth lens element L4 has positive refractive power, wherein an object-side surface S7 of the fourth lens element is concave, and an image-side surface S8 of the fourth lens element is convex.
The fifth lens element L5 has positive refractive power, wherein an object-side surface S9 of the fifth lens element is convex, and an image-side surface S10 of the fifth lens element is concave.
The sixth lens L6 has negative optical power, the object-side surface S11 of the sixth lens is convex, and the image-side surface S12 of the sixth lens is concave.
The seventh lens L7 has positive optical power, the object-side surface S13 of the seventh lens is convex, and the image-side surface S14 of the seventh lens is convex.
The eighth lens L8 has negative optical power, the object-side surface S15 of the eighth lens is concave, and the image-side surface S16 of the eighth lens is concave.
The ninth lens L9 has negative optical power, the object side surface S17 of the ninth lens is convex, and the image side surface S18 of the ninth lens is concave.
The object side surface S19 of the filter G1 is a plane, and the image side surface S20 is a plane.
The first lens L1 and the fourth lens L4 are glass spherical lenses, and the second lens L2, the third lens L3, the fifth lens L5, the sixth lens L6, the seventh lens L7, the eighth lens L8 and the ninth lens L9 are plastic aspherical lenses.
Specifically, the design parameters of each lens of the optical lens 100 provided in this embodiment are shown in table 1.
TABLE 1
The aspherical surface coefficients of the optical lens 100 in this embodiment are shown in table 2.
TABLE 2
Referring to fig. 2, 3, 4 and 5, a field curvature curve, a distortion curve, an axial chromatic aberration curve and a vertical chromatic aberration curve of the optical lens 100 are shown. As can be seen from fig. 2, the curvature of field is controlled within ±0.03mm, indicating that the curvature of field of the optical lens 100 is well corrected; as can be seen from fig. 3, the f-theta distortion is controlled within ±7%, which indicates that the optical lens 100 has better distortion correction; as can be seen from fig. 4, the offset of the axial chromatic aberration is controlled within ±0.02mm, which indicates that the axial chromatic aberration of the optical lens 100 is well corrected; as can be seen from fig. 5, the vertical chromatic aberration of the shortest wavelength and the longest wavelength is controlled within ±2.5 μm, indicating that the vertical chromatic aberration of the optical lens 100 is well corrected. As can be seen from fig. 2, 3, 4 and 5, the aberration of the optical lens 100 is well balanced, and has good optical imaging quality.
Second embodiment
Referring to fig. 6, a schematic structural diagram of an optical lens 200 according to a second embodiment of the present invention is shown, and the optical lens 200 according to the present embodiment is substantially the same as the first embodiment, and is mainly different in that an object-side surface S7 of the fourth lens element is a convex surface, a ninth lens element L9 has positive optical power, and differences in curvature radius, aspheric coefficients, thickness, etc. of lens surfaces are different.
Specifically, the design parameters of the optical lens 200 provided in this embodiment are shown in table 3.
TABLE 3 Table 3
The aspherical surface coefficients of the optical lens 200 in this embodiment are shown in table 4.
TABLE 4 Table 4
Referring to fig. 7, 8, 9 and 10, a field curvature curve, a distortion curve, an axial chromatic aberration curve and a vertical chromatic aberration curve of the optical lens 200 are shown. As can be seen from fig. 7, the curvature of field is controlled within ±0.1mm, which indicates that the curvature of field of the optical lens 200 is well corrected; as can be seen from fig. 8, the f-theta distortion is controlled within ±6%, which indicates that the optical lens 200 has better distortion correction; as can be seen from fig. 9, the offset of the axial chromatic aberration is controlled within ±0.02mm, which indicates that the axial chromatic aberration of the optical lens 200 is well corrected; as can be seen from fig. 10, the vertical chromatic aberration of the shortest wavelength and the longest wavelength is controlled within ±3.5 μm, indicating that the vertical chromatic aberration of the optical lens 200 is well corrected; as can be seen from fig. 7, 8, 9 and 10, the aberration of the optical lens 200 is well balanced, and has good optical imaging quality.
Third embodiment
Referring to fig. 11, a schematic structural diagram of an optical lens 300 according to a third embodiment of the present invention is shown, and the optical lens 300 of the present embodiment is substantially the same as the first embodiment described above, and the difference is that the ninth lens L9 has positive focal power and the curvature radius, aspheric coefficients, thickness, etc. of each lens surface are different.
Specifically, the design parameters of the optical lens 300 provided in this embodiment are shown in table 5.
TABLE 5
The aspherical surface coefficients of the optical lens 300 in this embodiment are shown in table 6.
TABLE 6
Referring to fig. 12, 13, 14 and 15, a field curvature curve, a distortion curve, an axial chromatic aberration curve and a vertical chromatic aberration curve of the optical lens 300 are shown. From fig. 12, it can be seen that the curvature of field is controlled within ±0.03mm, which indicates that the curvature of field of the optical lens 300 is well corrected; as can be seen from fig. 13, the f-theta distortion is controlled within ±7%, which indicates that the optical lens 300 has better distortion correction; as can be seen from fig. 14, the offset of the axial chromatic aberration is controlled within ±0.03mm, which indicates that the axial chromatic aberration of the optical lens 300 is well corrected; as can be seen from fig. 15, the vertical chromatic aberration of the shortest wavelength and the longest wavelength is controlled within ±3 μm, indicating that the vertical chromatic aberration of the optical lens 300 is well corrected; as can be seen from fig. 12, 13, 14 and 15, the aberrations of the optical lens 300 are well balanced, with good optical imaging quality.
Referring to table 7, the optical characteristics of the optical lens provided in the above three embodiments respectively include a maximum field angle FOV, an optical total length TTL, an image height IH corresponding to a maximum half field angle, an effective focal length f, an aperture value Fno, and a correlation value corresponding to each of the foregoing conditional expressions.
TABLE 7
Compared with the prior art, the optical lens provided by the invention has at least the following advantages:
(1) The optical lens provided by the invention adopts nine glass-plastic mixed lenses for matching, and through specific focal power combination and surface type matching, the lens not only has smaller total length and volume, but also has better thermal stability, and can realize high-definition imaging of the lens in high-low temperature environments.
(2) The optical lens provided by the invention has reasonable lens surface type and focal power arrangement, and the lens has an oversized view angle (the view angle can reach 200 degrees) through the combination of the spherical lens and the aspheric lens, so that pictures in a larger range can be shot, and meanwhile, the lens has smaller distortion, and the requirements of ultra-wide angle, small distortion and high pixels can be better met.
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 merely represent 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. Accordingly, the scope of the invention should be assessed as that of the appended claims.
Claims (11)
1. An optical lens comprising nine lenses, wherein the optical lens comprises, in order 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 concave image-side surface;
the object side surface of the third lens is a concave surface, and the image side surface of the third lens is a convex surface;
a fourth lens having positive optical power, the image-side surface of which is convex;
a fifth lens element with positive refractive power having a convex object-side surface and a concave image-side surface;
a sixth lens element with negative refractive power having a convex object-side surface and a concave image-side surface;
a seventh lens element with positive refractive power having a convex object-side surface and a convex image-side surface;
an eighth lens element with negative refractive power having a concave object-side surface and a concave image-side surface;
a ninth lens element with optical power having a convex object-side surface and a concave image-side surface;
wherein, the optical lens satisfies the conditional expression: -1< f12/f34< -0.2, f12 representing the combined focal length of the first and second lenses, f34 representing the combined focal length of the third and fourth lenses;
the optical lens satisfies the following conditional expression: -0.1< (IH-fxθ)/IH < -0.02; wherein θ represents a maximum half field angle of the optical lens, IH represents an image height corresponding to the maximum half field angle of the optical 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:
1.5<IH/f<1.8；
wherein IH represents the image height corresponding to the maximum half field angle 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:
8<TTL/f<9；
wherein TTL represents the total optical length of the optical lens, and f represents the effective focal length of the optical lens.
4. The optical lens according to claim 1, wherein the optical lens satisfies the following conditional expression:
-10<f1/f<-3；
0.8<f1/f2<2.0；
wherein f1 represents the focal length of the first lens, f2 represents the focal length of the second lens, and f represents the effective focal length of the optical lens.
5. The optical lens according to claim 1, wherein the optical lens satisfies the following conditional expression:
-4.5<f2/f<-2.6；
-5<R4/R3<0；
wherein f2 represents a focal length of the second lens, f represents an effective focal length of the optical lens, R3 represents a radius of curvature of an object side surface of the second lens, and R4 represents a radius of curvature of an image side surface of the second lens.
6. The optical lens according to claim 1, wherein the optical lens satisfies the following conditional expression:
5.5<f3/f<30；
2.5<f4/f<4；
wherein f3 represents a focal length of the third lens, f4 represents a focal length of the fourth lens, and f represents an effective focal length of the optical lens.
7. The optical lens according to claim 1, wherein the optical lens satisfies the following conditional expression:
2.5<f5/f<5；
-4<f6/f<-1；
wherein f5 denotes a focal length of the fifth lens, f6 denotes a focal length of the sixth lens, and f denotes an effective focal length of the optical lens.
8. The optical lens according to claim 1, wherein the optical lens satisfies the following conditional expression:
1<f7/f<1.9；
-5<f8/f<-1.5；
wherein f7 denotes a focal length of the seventh lens, f8 denotes a focal length of the eighth lens, and f denotes an effective focal length of the optical lens.
9. The optical lens according to claim 1, wherein the optical lens satisfies the following conditional expression:
|f9/f|＞8；
0.3<R17/R18<3；
where f9 denotes a focal length of the ninth lens, R17 denotes a radius of curvature of an object side surface of the ninth lens, and R18 denotes a radius of curvature of an image side surface of the ninth lens.
10. The optical lens according to claim 1, wherein the optical lens satisfies the following conditional expression:
1.5<f567/f<2.5；
where f represents an effective focal length of the optical lens, and f567 represents a combined focal length of the fifth lens, the sixth lens, and the seventh lens.
11. The optical lens according to claim 1, wherein the optical lens satisfies the following conditional expression:
5<DM1/DM5<7.5；
wherein DM1 represents the maximum effective aperture of the first lens, and DM5 represents the maximum effective aperture of the fifth lens.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112099205A (en) * | 2020-11-16 | 2020-12-18 | 江西联创电子有限公司 | Wide-angle lens |
| CN112799216A (en) * | 2021-02-04 | 2021-05-14 | 浙江舜宇光学有限公司 | Optical imaging lens |
| WO2022089327A1 (en) * | 2020-10-26 | 2022-05-05 | 江西联益光学有限公司 | Optical lens and imaging device |
| CN116088131A (en) * | 2021-11-08 | 2023-05-09 | 东莞市宇瞳光学科技股份有限公司 | Fixed focus lens |
| CN116755216A (en) * | 2023-06-30 | 2023-09-15 | 中山联拓光学有限公司 | Wide-angle lens |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111929849B (en) * | 2020-09-29 | 2020-12-18 | 瑞泰光学(常州)有限公司 | Image pickup optical lens |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022089327A1 (en) * | 2020-10-26 | 2022-05-05 | 江西联益光学有限公司 | Optical lens and imaging device |
| CN112099205A (en) * | 2020-11-16 | 2020-12-18 | 江西联创电子有限公司 | Wide-angle lens |
| CN112799216A (en) * | 2021-02-04 | 2021-05-14 | 浙江舜宇光学有限公司 | Optical imaging lens |
| CN116088131A (en) * | 2021-11-08 | 2023-05-09 | 东莞市宇瞳光学科技股份有限公司 | Fixed focus lens |
| CN116755216A (en) * | 2023-06-30 | 2023-09-15 | 中山联拓光学有限公司 | Wide-angle lens |
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