CN115980985B - optical lens - Google Patents
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- CN115980985B CN115980985B CN202310272347.0A CN202310272347A CN115980985B CN 115980985 B CN115980985 B CN 115980985B CN 202310272347 A CN202310272347 A CN 202310272347A CN 115980985 B CN115980985 B CN 115980985B
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Abstract
The application discloses an optical lens, which sequentially comprises the following components from an object plane to an imaging plane along an optical axis: a first lens element with negative refractive power having a concave object-side surface at a paraxial region and a concave image-side surface; the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a convex surface; a third lens element with negative refractive power having a convex object-side surface at a paraxial region and a concave image-side surface at a paraxial region; the object side surface of the fourth lens is a convex surface, and the image side surface of the fourth lens is a convex surface; a fifth lens element with negative refractive power having a convex object-side surface at a paraxial region and a concave image-side surface at a paraxial region; the object side surface of the sixth lens is convex at a paraxial region, and the image side surface of the sixth lens is concave at a paraxial region. The optical lens provided by the application adopts six aspheric lenses with focal power and meets a preset conditional expression, and has the advantages of large field angle, short total length and high resolution quality.
Description
Technical Field
The application relates to the technical field of imaging lenses, in particular to an optical lens.
Background
In recent years, along with rapid development of technology, imaging quality requirements of consumers on mobile electronic products such as smart phones are also higher and higher, and most mobile phones are provided with at least two lenses, one main lens and one wide-angle lens. However, the existing wide-angle lens generally adopts a structure of four to six lenses, and when the number of lenses is large, it is difficult to satisfy the requirements of large field of view and short total length under the condition of guaranteeing imaging quality, so that it is required to design an optical wide-angle lens with large angle of view, short total length and good imaging quality.
Disclosure of Invention
The application aims to at least solve one of the technical problems in the prior art and provide an optical lens.
In order to achieve the above purpose, the technical scheme adopted by the application is as follows: the optical lens sequentially includes, from an object side to an image side along an optical axis: a first lens, a diaphragm, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and an imaging surface;
the first lens is provided with negative focal power, the object side surface of the first lens is a concave surface at a paraxial region, and the image side surface of the first lens is a concave surface;
the second lens has positive focal power, the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a convex surface;
the third lens has negative focal power, the object side surface of the third lens is a convex surface at a paraxial region, and the image side surface of the third lens is a concave surface at the paraxial region;
the fourth lens has positive focal power, the object side surface of the fourth lens is a convex surface, and the image side surface of the fourth lens is a convex surface;
the fifth lens has negative focal power, the object side surface of the fifth lens is convex at a paraxial region, and the image side surface of the fifth lens is concave at the paraxial region;
the sixth lens element has an object-side surface being convex at a paraxial region and an image-side surface being concave at a paraxial region.
Further, the optical lens satisfies the following conditional expression:
-2<φ21/φ11< -1；
wherein φ 21 represents the optical power of the object side of the second lens, and φ 11 represents the optical power of the object side of the first lens.
Further, the optical lens satisfies the following conditional expression:
0.15<(CT1+CT12)/TTL<0.25；
wherein, CT1 represents the center thickness of the first lens, CT12 represents the air space between the first lens and the second lens on the optical axis, and TTL represents the distance from the object side surface of the first lens to the imaging surface on the optical axis.
Further, the optical lens satisfies the following conditional expression:
-3<R22/R12< -0.5；
wherein R22 represents a radius of curvature of the image side surface of the second lens, and R12 represents a radius of curvature of the image side surface of the first lens.
Further, the optical lens satisfies the following conditional expression:
1.5< SAG12/SAG11<3.5；
-2<R11/R12< -0.5；
wherein SAG12 represents the sagittal height of the image side of the first lens, SAG11 represents the sagittal height of the object side of the first lens, R11 represents the radius of curvature of the object side of the first lens, and R12 represents the radius of curvature of the image side of the first lens.
Further, the optical lens satisfies the following conditional expression:
1.5<CT2/CT3<2；
wherein CT2 represents the center thickness of the second lens and CT3 represents the center thickness of the third lens.
Further, the optical lens satisfies the following conditional expression:
-0.5<SAG41/SAG42< -0.2；
10<CT4/CT34<20；
wherein SAG41 represents the sagittal height of the object side surface of the fourth lens, SAG42 represents the sagittal height of the image side surface of the fourth lens, CT4 represents the center thickness of the fourth lens, and CT34 represents the air gap between the third lens and the fourth lens on the optical axis.
Further, the optical lens satisfies the following conditional expression:
4<R62/R52<5；
where R62 represents a radius of curvature of the image side surface of the sixth lens, and R52 represents a radius of curvature of the image side surface of the fifth lens.
Further, the optical lens satisfies the following conditional expression:
-2<f1/f< -1；
wherein f1 represents the focal length of the first lens, and f represents the effective focal length of the optical lens.
Further, the optical lens satisfies the following conditional expression:
0.05<CT6/TTL<0.15；
wherein CT6 represents the center thickness of the sixth lens element, and TTL represents the distance between the object side surface of the first lens element and the imaging surface on the optical axis.
Further, the optical lens satisfies the following conditional expression:
0.2<FFL/TTL<0.3；
wherein FFL represents the distance between the image side surface of the sixth lens element and the image plane on the optical axis, and TTL represents the distance between the object side surface of the first lens element and the image plane on the optical axis.
The application has the beneficial effects that: as can be seen from the above description of the present application, compared with the prior art, the optical lens provided by the present application reasonably distributes the thickness and the optical power of six lenses, and reasonably controls the surface shape of each lens, so as to improve the optical performance of the optical lens; according to the application, six aspheric lens combinations are adopted, and the proportion of each lens in the total length is reasonably distributed through specific surface shape collocation and reasonable focal power distribution, so that the optical lens has the characteristics of large field angle, short total length and high imaging quality, the optical lens has a more compact structure, imaging in the whole field of view is clearer, and the visual experience of a user is effectively improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of an optical lens according to a first embodiment of the present application;
FIG. 2 is a graph showing a field curvature of an optical lens according to a first embodiment of the present application;
FIG. 3 is a graph showing optical distortion of an optical lens according to a first embodiment of the present application;
FIG. 4 is an axial aberration diagram of an optical lens according to a first embodiment of the present application;
fig. 5 is a schematic structural diagram of an optical lens according to a second embodiment of the present application;
FIG. 6 is a graph showing a field curvature of an optical lens according to a second embodiment of the present application;
FIG. 7 is a graph showing optical distortion of an optical lens according to a second embodiment of the present application;
FIG. 8 is an axial aberration diagram of an optical lens according to a second embodiment of the present application;
fig. 9 is a schematic structural diagram of an optical lens according to a third embodiment of the present application;
fig. 10 is a graph showing a field curve of an optical lens according to a third embodiment of the present application:
FIG. 11 is a graph showing optical distortion of an optical lens according to a third embodiment of the present application;
FIG. 12 is an axial aberration diagram of an optical lens according to a third embodiment of the present application;
fig. 13 is a schematic structural diagram of an optical lens according to a fourth embodiment of the present application;
fig. 14 is a graph showing a field curve of an optical lens according to a fourth embodiment of the present application:
FIG. 15 is a graph showing optical distortion of an optical lens according to a fourth embodiment of the present application;
fig. 16 is an axial aberration diagram of an optical lens according to a fourth embodiment of the application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It will be apparent that the described embodiments are only some, but not all, embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
In the description of the present application, it should be noted that the positional or positional relationship indicated by the terms such as "upper", "lower", "inner", "outer", "top/bottom", etc. are based on the positional or positional relationship shown in the drawings, are merely for convenience of describing the present application and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present application. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
The application provides an optical lens, which sequentially comprises from an object side to an imaging surface along an optical axis: a first lens, a diaphragm, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and an optical filter;
the first lens has negative focal power, the object side surface of the first lens is a concave surface at a paraxial region, and the image side surface of the first lens is a concave surface;
the second lens has positive focal power, the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a convex surface;
the third lens has negative focal power, the object side surface of the third lens is convex at a paraxial region, and the image side surface of the third lens is concave at the paraxial region;
the fourth lens has positive focal power, the object side surface of the fourth lens is a convex surface, and the image side surface of the fourth lens is a convex surface at a paraxial region;
the fifth lens has negative focal power, the object side surface of the fifth lens is convex at a paraxial region, and the image side surface of the fifth lens is concave at the paraxial region;
the sixth lens element has optical power, wherein an object-side surface of the sixth lens element is convex at a paraxial region thereof, and an image-side surface of the sixth lens element is concave at a paraxial region thereof;
meanwhile, the first lens to the sixth lens are aspheric lenses;
according to the application, six aspheric lens combinations are adopted, and the proportion of each lens in the total length is reasonably distributed through specific surface shape collocation and reasonable focal power distribution, so that the optical lens has the characteristics of large field angle, short total length and high imaging quality, the optical lens has a more compact structure, imaging in the whole field of view is clearer, and the visual experience of a user is effectively improved.
In some embodiments, the optical lens satisfies the following conditional expression:
-2<φ21/φ11< -1；(1)
wherein φ 21 represents the optical power of the object side of the second lens, and φ 11 represents the optical power of the object side of the first lens. Six aspheric lens combinations are adopted, and through specific surface shape collocation and reasonable focal power distribution, the above condition (1) is satisfied, and phi 21/phi 11 values are reasonably distributed, so that the optical lens has the characteristics of large field angle, short total length and high imaging quality.
In some embodiments, the optical lens satisfies the following conditional expression:
0.15<(CT1+CT12)/TTL<0.25；(2)
wherein, CT1 represents the center thickness of the first lens, CT12 represents the air space between the first lens and the second lens on the optical axis, and TTL represents the distance from the object side surface of the first lens to the imaging surface on the optical axis. Six aspheric lens combinations are adopted, the above conditional (2) is satisfied through specific surface shape collocation and reasonable focal power distribution, and the ratio of (CT1+CT12) in the total length is reasonably adjusted, so that the optical lens has the characteristics of large field angle, short total length and high imaging quality.
In some embodiments, the optical lens satisfies the following conditional expression:
-3<R22/R12< -0.5；(3)
wherein R22 represents a radius of curvature of the image side surface of the second lens, and R12 represents a radius of curvature of the image side surface of the first lens. And (3) satisfying the condition, and reasonably distributing the curvature radiuses of the image side surface of the first lens and the image side surface of the second lens is beneficial to correcting the axial aberration of the lens and improving the imaging quality of the optical lens.
In some embodiments, the optical lens satisfies the following conditional expression:
1.5< SAG12/SAG11<3.5；(4)
-2<R11/R12< -0.5；(5)
wherein SAG12 represents the sagittal height of the image side of the first lens, SAG11 represents the sagittal height of the object side of the first lens, R11 represents the radius of curvature of the object side of the first lens, and R12 represents the radius of curvature of the image side of the first lens. Meanwhile, the conditional expressions (4) and (5) are satisfied, and the sagittal height of the two faces of the first lens and the curvature radius of the two faces of the first lens are reasonably controlled, so that the incident angle of light entering the diaphragm is reduced, and the viewing angle of the optical lens is increased.
In some embodiments, the optical lens satisfies the following conditional expression:
1.5<CT2/CT3<2；(6)
wherein CT2 represents the center thickness of the second lens and CT3 represents the center thickness of the third lens. And the central thickness of the third lens is increased by reasonably controlling the ratio of the central thicknesses of the second lens and the third lens, so that the structural design and the processing of the third lens are facilitated.
In some embodiments, the optical lens satisfies the following conditional expression:
-0.5<SAG41/SAG42< -0.2；(7)
10<CT4/CT34<20；(8)
wherein SAG41 represents the sagittal height of the object side surface of the fourth lens, SAG42 represents the sagittal height of the image side surface of the fourth lens, CT4 represents the center thickness of the fourth lens, and CT34 represents the air gap between the third lens and the fourth lens on the optical axis. Meanwhile, the conditions (7) and (8) are satisfied, and the sagittal height of the fourth lens and the relation between the center thickness of the fourth lens and the spacing between the third lens and the fourth lens are reasonably controlled, so that the distribution of the third lens and the fourth lens is more compact, the total length of the optical lens is reduced, and the miniaturization of the optical lens is realized.
In some embodiments, the optical lens satisfies the following conditional expression:
4<R62/R52<5；(9)
where R62 represents a radius of curvature of the image side surface of the sixth lens, and R52 represents a radius of curvature of the image side surface of the fifth lens. The above conditional expression (9) is satisfied, and the ratio of the radii of curvature of the sixth lens element image side and the fifth lens element image side is reasonably controlled, which is advantageous for controlling the effective focal length of the optical lens element and for increasing the angle of view of the optical lens element.
In some embodiments, the optical lens satisfies the following conditional expression:
-2<f1/f< -1；(10)
wherein f1 represents the focal length of the first lens, and f represents the effective focal length of the optical lens. Satisfying the above conditional expression (10), by reasonably controlling the relationship between the focal length of the first lens and the effective focal length of the optical lens, the light beam entering the optical lens is advantageously converged, the total length of the optical lens is advantageously reduced, and the miniaturization of the optical lens is advantageously realized.
In some embodiments, the optical lens satisfies the following conditional expression:
0.05<CT6/TTL<0.15；(11)
wherein CT6 represents the center thickness of the sixth lens element, and TTL represents the distance between the object side surface of the first lens element and the imaging surface on the optical axis. The above conditional expression (11) is satisfied, and the reduction of the total length of the optical lens is facilitated by reasonably controlling the ratio of the center thickness of the sixth lens in the total length of the optical lens, which is advantageous for realizing miniaturization of the optical lens.
In some embodiments, the optical lens satisfies the following conditional expression:
0.2<FFL/TTL<0.3；(12)
wherein FFL represents the distance between the image side surface of the sixth lens element and the image plane on the optical axis, and TTL represents the distance between the object side surface of the first lens element and the image plane on the optical axis. The conditional expression (12) is satisfied, and the relationship between the optical back focus and the total optical length of the optical lens is reasonably controlled, so that the risk of interference between a mechanism and the lens is reduced, and the mechanism design of a product is facilitated.
In some embodiments, the optical lens satisfies the following conditional expression:
0.35<(SAG52+SAG61)/CT56<1；(13)
where SAG52 represents the sagittal height of the image side of the fifth lens, SAG61 represents the sagittal height of the object side of the sixth lens, and CT56 represents the air gap on the optical axis between the fifth lens and the sixth lens. The above conditional expression (13) is satisfied, and by reasonably controlling the relation between the sagittal height of the image side surface of the fifth lens and the sagittal height of the object side surface of the sixth lens and the air intervals of the fifth lens and the sixth lens, the aberration of the off-axis view field can be corrected, and the imaging quality of the optical lens can be improved.
In some embodiments, the optical lens satisfies the following conditional expression:
0.3<(SAG61-SAG62)/CT6<0.5；(14)
where SAG61 represents the sagittal height of the object side surface of the sixth lens, SAG62 represents the sagittal height of the image side surface of the sixth lens, and CT6 represents the center thickness of the sixth lens. The above conditional expression (14) is satisfied, and the ratio of the edge thickness to the center thickness of the sixth lens is reasonably controlled, so that the design and the processing of the sixth lens structure are facilitated, the aberration of each view field is respectively corrected, and the imaging quality of the optical lens is improved.
In some embodiments, the optical lens satisfies the following conditional expression:
1<(SAG51-SAG42)/CT45<2；(15)
wherein SAG51 represents the sagittal height of the object side surface of the fifth lens, SAG42 represents the sagittal height of the image side surface of the fourth lens, and CT45 represents the air gap between the fourth lens and the fifth lens on the optical axis. The above conditional expression (15) is satisfied, and by reasonably controlling the relation of the sagittal height of the object side surface of the fifth lens, the sagittal height of the image side surface of the fourth lens and the air interval between the fourth lens and the fifth lens, the coma aberration of the off-axis view field is corrected, and the imaging quality of the off-axis view field of the optical lens is improved.
In various embodiments of the present application, when an aspherical lens is used as the lens, the surface shape of the aspherical lens satisfies the following equation:
where z is the distance sagittal height from the aspherical surface vertex when the aspherical surface is at a position of height h in the optical axis direction, c is the paraxial curvature of the surface, k is the conic coefficient conic,the aspherical surface profile coefficient of the 2 i-th order.
The application 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 application, but the embodiments of the present application 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 application are intended to be equivalent substitutes within the scope of the present application.
First embodiment
Referring to fig. 1, a schematic structural diagram of an optical lens 100 according to a first embodiment of the present application is shown, where the optical lens 100 includes, in order from an object side to an imaging surface S15 along an optical axis: a first lens L1, a stop ST, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, and a filter G1.
Specific:
the first lens element L1 has negative refractive power, wherein an object-side surface S1 of the first lens element is concave at a paraxial region, and an image-side surface S2 of the first lens element is concave;
the second lens element L2 has positive refractive power, wherein an object-side surface S3 of the second lens element is convex, and an image-side surface S4 of the second lens element is convex;
the third lens element L3 has negative refractive power, wherein an object-side surface S5 of the third lens element is convex at a paraxial region thereof, and an image-side surface S6 of the third lens element is concave;
the fourth lens element L4 has positive refractive power, wherein an object-side surface S7 thereof is convex, and an image-side surface S8 thereof is convex at a paraxial region;
the fifth lens element L5 has negative refractive power, wherein an object-side surface S9 of the fifth lens element is convex at a paraxial region thereof, and an image-side surface S10 of the fifth lens element is concave at a paraxial region thereof;
the sixth lens element L6 with positive refractive power has a convex object-side surface S11 at a paraxial region and a concave image-side surface S12 at a paraxial region;
the object side surface of the filter G1 is S13, and the image side surface is S14.
Wherein, the first lens to the sixth lens are all plastic aspheric lenses.
The relevant parameters of each lens in the optical lens 100 according to the first embodiment of the present application are shown in table 1.
TABLE 1
The surface profile coefficients of the aspherical surfaces of the optical lens 100 in this embodiment are shown in table 2.
TABLE 2
In the present embodiment, graphs of the structural diagram, curvature of field, optical distortion, and axial aberration of the optical lens 100 are shown in fig. 1, 2, 3, and 4, respectively.
Fig. 2 shows a field curvature curve of the optical lens 100 in this embodiment, which represents field curvature values at different fields of view, and it can be seen from the figure that the field curvature values at each field of view are controlled within ±0.1mm, which indicates that the field curvature of each field of view of the optical lens 100 is well corrected.
Fig. 3 shows optical distortion curves of the optical lens 100 of the present embodiment, which represent distortions at different fields of view on the imaging plane, and it can be seen from the figure that the optical distortion is controlled within ±25%, and the optical distortion at the angle of view of 0-48 ° is controlled within ±5%, which means that the distortion of the optical lens 100 is well corrected.
Fig. 4 shows axial aberration curves of the optical lens 100 in the present embodiment, which represent aberrations of different wavelengths in the optical axis direction on the optical axis, and it can be seen from the figure that axial aberrations of all wavelengths are controlled within ±0.025mm, which means that axial aberrations of the optical lens 100 are well corrected.
Second embodiment
Referring to fig. 5, a schematic structural diagram of an optical lens 200 according to a second embodiment of the present application is shown, and the optical lens 200 in the present embodiment is substantially the same as the first embodiment, except that the sixth lens L6 has negative optical power, and the other differences are shown in tables 3 and 4.
The relevant parameters of each lens in the optical lens 200 according to the second embodiment of the present application are shown in table 3.
TABLE 3 Table 3
The surface profile coefficients of the aspherical surfaces of the optical lens 200 in this embodiment are shown in table 4.
TABLE 4 Table 4
In the present embodiment, graphs of the structural diagram, curvature of field, optical distortion, and axial aberration of the optical lens 200 are shown in fig. 5, 6, 7, and 8, respectively. As can be seen from the figure, the curvature of field is controlled within ±0.15mm, which indicates that the curvature of field of the optical lens 200 is well corrected; the optical distortion is controlled within +/-28 percent, and the optical distortion of 0-48 degrees of the field angle is controlled within +/-7 percent, which indicates that the distortion of the optical lens 200 is well corrected; the axial aberration of all wavelengths is controlled within + -0.025 mm, which means that the axial aberration of each field of view of the optical lens 200 is well corrected.
Third embodiment
Referring to fig. 9, a schematic structural diagram of an optical lens 300 according to a third embodiment of the present application is shown, and the optical lens 300 in the present embodiment is substantially the same as the first embodiment, except that the sixth lens L6 has negative optical power, and the other differences are shown in tables 5 and 6.
The relevant parameters of each lens in the optical lens 300 according to the third embodiment of the present application are shown in table 5.
TABLE 5
The surface profile coefficients of the aspherical surfaces of the optical lens 300 in this embodiment are shown in table 6.
TABLE 6
In the present embodiment, graphs of the structural diagram, curvature of field, optical distortion, and axial aberration of the optical lens 300 are shown in fig. 9, 10, 11, and 12, respectively. As can be seen from the figure, the curvature of field is controlled within ±0.15mm, which indicates that the curvature of field of the optical lens 300 is well corrected; the optical distortion is controlled within +/-28 percent, and the optical distortion of 0-48 degrees of the field angle is controlled within +/-7 percent, which indicates that the distortion of the optical lens 300 is well corrected; the axial aberration of all wavelengths is controlled within + -0.026 mm, which indicates that the axial aberration of each field of view of the optical lens 300 is well corrected.
Fourth embodiment
Referring to fig. 13, a schematic diagram of an optical lens 400 according to a fourth embodiment of the present application is shown, and the optical lens 400 in this embodiment is substantially the same as the first embodiment, and the differences are shown in tables 7 and 8.
The parameters related to each lens in the optical lens 400 according to the fourth embodiment of the present application are shown in table 7.
TABLE 7
The surface profile coefficients of the aspherical surfaces of the optical lens 400 in this embodiment are shown in table 8.
TABLE 8
In the present embodiment, graphs of the structural diagram, curvature of field, optical distortion, and axial aberration of the optical lens 400 are shown in fig. 13, 14, 15, and 16, respectively. As can be seen from the figure, the curvature of field is controlled within ±0.1mm, which indicates that the curvature of field of the optical lens 400 is well corrected; the optical distortion is controlled within +/-25 percent, and the optical distortion of 0-48 degrees of the field angle is controlled within +/-5 percent, which indicates that the distortion of the optical lens 400 is well corrected; the axial aberration of all wavelengths is controlled within + -0.03 mm, which means that the axial aberration of each field of view of the optical lens 400 is well corrected.
Table 9 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 an image height IH corresponding to FOV of the system, and a numerical value corresponding to each of the above conditional expressions.
TABLE 9
In summary, the optical lens provided by the application adopts six aspheric lenses with specific focal power, and the focal power distribution is reasonable through specific surface shape collocation: the optical lens achieves a larger field angle and has a wide imaging range; meanwhile, the arrangement of six lenses is compact, and the total length of the optical lens is reduced; the optical lens has the advantages of large field angle, short total length and high imaging quality.
The above examples merely represent a few embodiments of the present application, which are described in more detail and are not to be construed as limiting the scope of the present application. 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 application, which are all within the scope of the application. Accordingly, the scope of the application should be assessed as that of the appended claims.
Claims (8)
1. An optical lens, comprising, in order from an object side to an image side along an optical axis: a first lens, a diaphragm, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and an imaging surface;
the first lens is provided with negative focal power, the object side surface of the first lens is a concave surface at a paraxial region, and the image side surface of the first lens is a concave surface;
the second lens has positive focal power, the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a convex surface;
the third lens has negative focal power, the object side surface of the third lens is a convex surface at a paraxial region, and the image side surface of the third lens is a concave surface at the paraxial region;
the fourth lens has positive focal power, the object side surface of the fourth lens is a convex surface, and the image side surface of the fourth lens is a convex surface;
the fifth lens has negative focal power, the object side surface of the fifth lens is convex at a paraxial region, and the image side surface of the fifth lens is concave at the paraxial region;
the sixth lens is provided with focal power, the object side surface of the sixth lens is convex at a paraxial region, and the image side surface of the sixth lens is concave at the paraxial region;
the optical lens satisfies the following conditional expression:
0.104<CT6/TTL<0.15；
wherein CT6 represents the center thickness of the sixth lens element, and TTL represents the distance between the object-side surface of the first lens element and the imaging surface on the optical axis;
the optical lens satisfies the following conditional expression:
4<R62/R52<5；
wherein R62 represents a radius of curvature of the image-side surface of the sixth lens element, and R52 represents a radius of curvature of the image-side surface of the fifth lens element;
the optical lens satisfies the following conditional expression:
0.225<FFL/TTL<0.3；
wherein FFL represents the distance between the image side surface of the sixth lens element and the image plane on the optical axis, and TTL represents the distance between the object side surface of the first lens element and the image plane on the optical axis.
2. The optical lens according to claim 1, wherein the optical lens satisfies the following conditional expression:
-2<φ21/φ11<-1；
wherein φ 21 represents the optical power of the second lens object-side surface and φ 11 represents the optical power of the first lens object-side surface.
3. The optical lens according to claim 1, wherein the optical lens satisfies the following conditional expression:
0.15<(CT1+CT12)/TTL<0.25；
wherein, CT1 represents the center thickness of the first lens, CT12 represents the air space between the first lens and the second lens on the optical axis, and TTL represents the distance between the object side surface of the first lens and the imaging surface on the optical axis.
4. The optical lens according to claim 1, wherein the optical lens satisfies the following conditional expression:
-3<R22/R12<-0.5；
wherein R22 represents the radius of curvature of the second lens image side and R12 represents the radius of curvature of the first lens image side.
5. The optical lens according to claim 1, wherein the optical lens satisfies the following conditional expression:
1.5<SAG12/SAG11<3.5；
-2<R11/R12<-0.5；
wherein SAG12 represents the sagittal height of the image side surface of the first lens, SAG11 represents the sagittal height of the object side surface of the first lens, R11 represents the radius of curvature of the object side surface of the first lens, and R12 represents the radius of curvature of the image side surface of the first lens.
6. The optical lens according to claim 1, wherein the optical lens satisfies the following conditional expression:
1.5<CT2/CT3<2；
wherein CT2 represents the center thickness of the second lens and CT3 represents the center thickness of the third lens.
7. The optical lens according to claim 1, wherein the optical lens satisfies the following conditional expression:
-0.5<SAG41/SAG42<-0.2；
10<CT4/CT34<20；
wherein SAG41 represents the sagittal height of the object side surface of the fourth lens, SAG42 represents the sagittal height of the image side surface of the fourth lens, CT4 represents the center thickness of the fourth lens, and CT34 represents the air gap between the third lens and the fourth lens on the optical axis.
8. The optical lens according to claim 1, wherein the optical lens satisfies the following conditional expression:
-2<f1/f<-1；
wherein f1 represents the focal length of the first lens, and f represents the effective focal length of the optical lens.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN212675263U (en) * | 2020-09-11 | 2021-03-09 | 浙江舜宇光学有限公司 | Optical imaging lens group |
| CN113433670A (en) * | 2021-07-26 | 2021-09-24 | 浙江舜宇光学有限公司 | Optical imaging lens |
| CN115166950A (en) * | 2022-09-07 | 2022-10-11 | 江西联益光学有限公司 | Optical lens |
| CN115185071A (en) * | 2022-09-07 | 2022-10-14 | 江西联益光学有限公司 | Optical lens |
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| KR101681383B1 (en) * | 2014-11-18 | 2016-11-30 | 삼성전기주식회사 | Lens module |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN212675263U (en) * | 2020-09-11 | 2021-03-09 | 浙江舜宇光学有限公司 | Optical imaging lens group |
| CN113433670A (en) * | 2021-07-26 | 2021-09-24 | 浙江舜宇光学有限公司 | Optical imaging lens |
| CN115166950A (en) * | 2022-09-07 | 2022-10-11 | 江西联益光学有限公司 | Optical lens |
| CN115185071A (en) * | 2022-09-07 | 2022-10-14 | 江西联益光学有限公司 | Optical lens |
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