CN116299988A - Optical lens - Google Patents
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- CN116299988A CN116299988A CN202310589992.5A CN202310589992A CN116299988A CN 116299988 A CN116299988 A CN 116299988A CN 202310589992 A CN202310589992 A CN 202310589992A CN 116299988 A CN116299988 A CN 116299988A
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
- G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
- G02B13/0045—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having five or more lenses
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/06—Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
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Abstract
The present invention provides an optical lens comprising, 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 having negative optical power, the image side surface of which is concave; a third lens having positive optical power, the image side surface of which is convex; a fourth lens element with positive refractive power having a convex object-side surface and a convex image-side surface; a fifth lens with negative focal power, wherein the object side surface of the fifth lens is a concave surface, and the image side surface of the fifth lens is a concave surface; a sixth lens with positive focal power, the object side surface of which is a convex surface; wherein, the material refractive index Nd1 of the first lens and the effective focal length f1 of the first lens satisfy: -Nd 1/f1 < -0.3. The optical lens has the advantages of small volume, large field angle and high resolution.
Description
Technical Field
The invention relates to the technical field of imaging lenses, in particular to an optical lens.
Background
With the rapid development of unmanned aerial vehicle, security protection, automobile, weather, medical treatment, VR, AR and other fields, the lens angle of vision that carries on it has also put forward the higher requirement. However, the conventional lens has either a small angle of view or a large volume or a large distortion, and it is difficult to achieve a large angle of view, miniaturization, and a small distortion balance at the same time.
Disclosure of Invention
Therefore, an object of the present invention is to provide an optical lens having at least the advantages of a large angle of view, miniaturization, and small distortion.
The optical lens provided by the invention 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 having negative optical power, the image side surface of which is concave; a third lens having positive optical power, the image side surface of which is convex; a fourth lens element with positive refractive power having a convex object-side surface and a convex image-side surface; a fifth lens with negative focal power, wherein the object side surface of the fifth lens is a concave surface, and the image side surface of the fifth lens is a concave surface; a sixth lens with positive focal power, the object side surface of which is a convex surface; wherein, the material refractive index Nd1 of the first lens and the effective focal length f1 of the first lens satisfy: -Nd 1/f1 < -0.3.
Compared with the prior art, the optical lens provided by the invention adopts six lenses with specific focal power, and has the advantages of large field angle, high image quality, small distortion, miniaturization and large aperture through specific surface shape collocation and reasonable focal power distribution.
Drawings
Fig. 1 is a schematic structural diagram of an optical lens according to a first embodiment of the present invention.
Fig. 2 is a distortion graph of an optical lens according to a first embodiment of the present invention.
Fig. 3 is a graph showing a field curvature of an optical lens according to a first embodiment of the present invention.
Fig. 4 is a vertical axis chromatic aberration diagram of an optical lens according to a first embodiment of the present invention.
Fig. 5 is a graph of lateral chromatic aberration of an optical lens according to a first embodiment of the present invention.
Fig. 6 is a schematic structural diagram of an optical lens according to a second embodiment of the present invention.
Fig. 7 is a distortion graph of an optical lens according to a second embodiment of the present invention.
Fig. 8 is a field curvature chart of an optical lens according to a second embodiment of the present invention.
Fig. 9 is a vertical axis chromatic aberration diagram of an optical lens according to a second embodiment of the present invention.
Fig. 10 is a graph of lateral chromatic aberration of an optical lens according to a second embodiment of the present invention.
Fig. 11 is a schematic structural diagram of an optical lens according to a third embodiment of the present invention.
Fig. 12 is a distortion graph of an optical lens according to a third embodiment of the present invention.
Fig. 13 is a field curve diagram of an optical lens according to a third embodiment of the present invention.
Fig. 14 is a vertical axis chromatic aberration diagram of an optical lens according to a third embodiment of the present invention.
Fig. 15 is a graph showing a lateral chromatic aberration curve of an optical lens according to a third embodiment of the present invention.
Fig. 16 is a schematic structural view of an optical lens according to a fourth embodiment of the present invention.
Fig. 17 is a distortion graph of an optical lens according to a fourth embodiment of the present invention.
Fig. 18 is a field curvature graph of an optical lens according to a fourth embodiment of the present invention.
Fig. 19 is a vertical axis chromatic aberration diagram of an optical lens according to a fourth embodiment of the present invention.
Fig. 20 is a graph showing a lateral chromatic aberration of an optical lens according to a fourth 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.
The invention provides an optical lens, which comprises six lenses in sequence from an object side to an imaging surface along an optical axis: a first lens, a second lens, a third lens, a diaphragm, a fourth lens, a fifth lens, a sixth lens and an optical filter.
The first lens has negative focal power, and the object side surface of the first lens is a convex surface and the image side surface of the first lens is a concave surface; the second lens has negative focal power, the object side surface of the second lens is a concave surface or a convex surface, and the image side surface of the second lens is a concave surface; the third lens has positive focal power, and the object side surface of the third lens is a convex surface and the image side surface of the third lens is a convex surface; the fourth lens has positive focal power, and 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 a concave surface, and the image side surface of the fifth lens is a concave surface; the sixth lens is provided with positive focal power, the object side surface of the sixth lens is a convex surface, and the image side surface of the sixth lens is a convex surface; the first lens is a spherical glass lens, and the second lens to the sixth lens are aspherical lenses.
In some embodiments, the material refractive index Nd1 of the first lens satisfies: nd1 is more than 1.7 and less than 2.0; the material refractive index Nd1 of the first lens and the effective focal length f1 of the first lens satisfy: -Nd 1/f1 < -0.3. The method has the advantages that the range is met, the focal length of the glass lens is controlled within a certain range by reasonably selecting the materials of the glass lens, the thickness of the glass lens is uniform while the optical performance of the lens is met, the yield of the lens is improved, the risk of uneven coating is reduced, and the follow-up production process is better met.
In some embodiments, the optical total length TTL of the optical lens and the effective focal length f of the optical lens satisfy: 0.1 < f/TTL < 0.15. The optical lens meets the above range, is beneficial to controlling the focal length of the optical lens in a shorter range while maintaining the miniaturization of the optical lens, and is beneficial to enabling the optical lens to have a larger depth of field.
In some embodiments, the half image height IH of the optical lens and the total optical length TTL of the optical lens satisfy: IH/TTL is more than 0.15 and less than 0.25. The above range is satisfied, and the balance between the total length and imaging quality of the optical lens is achieved while maintaining the miniaturization of the optical lens.
In some embodiments, the half image height IH of the optical lens and the f-number FNO of the optical lens satisfy: IH/FNO is more than 0.3 and less than 0.8. The above range is satisfied, which is advantageous to expand the angle of view of the optical lens and increase the aperture of the optical lens, realizing the characteristics of wide angle and large aperture. The realization of the wide-angle characteristic is favorable for the optical lens to acquire more scene information, meets the requirement of large-range detection, and is favorable for improving the problem of rapid decrease of the relative brightness of the edge view field caused by the wide angle, thereby being favorable for acquiring more scene information.
In some embodiments, the radius of curvature R31 of the third lens object-side surface and the radius of curvature R32 of the third lens image-side surface satisfy: -5.0 < R32/R31 < -0.5; the radius of curvature R41 of the fourth lens object-side surface and the radius of curvature R42 of the fourth lens image-side surface satisfy: -1.5 < R42/R41 < -0.5. The aberration of the optical lens can be well corrected and the imaging quality of the lens can be improved by reasonably controlling the shapes of the third lens and the fourth lens.
In some embodiments, the maximum field angle FOV of the optical lens satisfies: 160 DEG < FOV < 180 DEG; the maximum field angle FOV of the optical lens and the total optical length TTL of the optical lens satisfy: 4.5 < FOV/(2 n. Times. TTL) < 5.5; wherein, pi is equal to 3.1415926535. The above range is satisfied, and the total length of the optical lens can be relatively small while having a large angle of view.
In some embodiments, the radius of curvature R21 of the second lens object-side surface and the effective focal length f of the optical lens satisfy:
. The lens meets the range, is favorable for slowing down the shape change of the second lens, reduces the sensitivity of the system, can improve the formability of the lens and improves the manufacturing yield.
In some embodiments, the sum of the center thickness CT3 of the third lens, the center thickness CT4 of the fourth lens, the center thickness CT5 of the fifth lens, and the sum of the edge thickness ET3 of the third lens, the edge thickness ET4 of the fourth lens, the edge thickness ET5 of the fifth lens satisfy: 1.0 < (CT3+CT4+CT5)/(ET 3+ET4+ET 5) < 1.5. The optical lens has the advantages that the central thickness and the edge thickness of the third lens, the fourth lens and the fifth lens are reasonably matched, the total length of the optical lens can be effectively controlled, meanwhile, the lens can be manufactured and molded, and the mass productivity of the lens is guaranteed.
In some embodiments, the effective focal length f of the optical lens and the effective focal length f2 of the second lens, the effective focal length f3 of the third lens satisfy: -1.0 < (1/f 2-1/f 3)/(1/f) < -0.6. The lens structure meets the above range, can effectively balance the shapes of the second lens and the third lens, reduces the difficulty of process molding, and improves the resolution of the optical lens.
In some embodiments, the object-side sagittal height SSAG21 of the second lens and the center thickness CT2 of the second lens satisfy:
the method comprises the steps of carrying out a first treatment on the surface of the The image-side sagittal height SSAG62 of the sixth lens and the center thickness CT6 of the sixth lens satisfy: />
. The lens has the advantages that the shape of the second lens and the shape of the sixth lens can be reasonably controlled, the lens edge aberration and the on-axis spherical aberration can be better reduced while the lens molding requirement is met, and the imaging quality of the optical lens is improved.
In some embodiments, the effective focal length f5 of the fifth lens and the effective focal length f of the optical lens satisfy: -1.5 < f5/f < -0.5; the radius of curvature R51 of the object-side surface of the fifth lens element and the radius of curvature R52 of the image-side surface of the fifth lens element satisfy the following conditions: -4.5 < (R51+R52)/(R51-R52) < -2.0. The lens has the advantages that the range is met, the field curvature and distortion of the lens can be well modified by reasonably controlling the focal power and the surface shape of the fifth lens, and the field curvature distortion of the lens is controlled at a smaller level.
In some embodiments, the sum of the center thickness CT3 of the third lens, the center thickness CT4 of the fourth lens, and the air space AT34 on the optical axis between the third lens and the fourth lens satisfy: 2.0 < (CT3+CT4)/AT 34 < 28.0. The vertical axis chromatic aberration of the lens can be well improved and the imaging quality of the optical lens can be improved while the lens molding requirement is met by reasonably controlling the center thicknesses of the third lens and the fourth lens and the distance between the third lens and the fourth lens.
In some embodiments, the half image height IH of the optical lens and the effective focal length f of the optical lens, the maximum field angle FOV of the optical lens, satisfy: 0.03 < IH/[ f×tan (FOV/2) ] < 0.1. Satisfying the above range can maintain the distortion of the optical lens in a small range.
In some embodiments, the sum of the effective focal length f4 of the fourth lens, the effective focal length f5 of the fifth lens, and the effective focal length f6 of the sixth lens, and the effective focal length f of the optical lens satisfy:
. The optical lens meets the range, is favorable for correcting various aberrations brought by the third lens, the fourth lens and the fifth lens, and improves the imaging quality of the optical lens.
In some embodiments, the optical back focal length BFL of the optical lens and the effective focal length f of the optical lens satisfy: BFL/f is less than 1.5 and less than 1.8. The optical lens has larger optical back focus, thereby being beneficial to reducing interference between the lens and the imaging chip and reducing the correction difficulty of CRA.
In some embodiments, in order to better reduce the total length of the optical lens and increase the field angle of the optical lens, a combination of one glass and five plastic lenses is adopted, and meanwhile, the optical lens has at least the advantages of large field angle, high image quality, large aperture, short depth of field, low sensitivity and miniaturization by reasonably distributing the focal power and the surface shape of each lens.
In some embodiments, the second lens to the sixth lens may be plastic aspherical lenses, and the aspherical lenses may be used to effectively correct aberration, improve imaging quality, and provide an optical performance product with higher cost performance.
In various embodiments of the present invention, when an aspherical lens is used as the lens, the surface shape of the aspherical lens satisfies the following equation:
the method comprises the steps of carrying out a first treatment on the surface of the Where 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 curvature of the surface, k is the conic coefficient conic, 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 S15 along an optical axis: a first lens L1, a second lens L2, a third lens L3, a stop ST, a fourth lens L4, a fifth lens L5, a sixth lens L6, and a filter G1.
The first lens element L1 has a 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 focal power, the object side surface S3 of the second lens is a convex surface, and the image side surface S4 of the second lens is a concave surface; the third lens element L3 has positive refractive power, wherein an object-side surface S5 of the third lens element is convex, 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 convex, and an image-side surface S8 of the fourth lens element is convex; the fifth lens element L5 has negative refractive power, wherein an object-side surface S9 of the fifth lens element is concave, and an image-side surface S10 of the fifth lens element is concave; the sixth lens element L6 with positive refractive power has a convex object-side surface S11 and a convex image-side surface S12; the object side surface of the optical filter G1 is S13, and the image side surface is S14; the first lens L1 is a glass spherical lens, and the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5 and the sixth lens L6 are plastic aspherical lenses.
Specifically, the design parameters of each lens of the optical lens 100 provided in the present embodiment are shown in table 1.
TABLE 1
The surface profile coefficients of the aspherical surface of the optical lens 100 in this embodiment are shown in table 2.
TABLE 2
Fig. 2 shows a distortion graph of the optical lens 100, which represents distortion at different fields of view on an imaging plane, the horizontal axis represents the percentage of optical distortion, and the vertical axis represents the half field angle (unit: °), and it can be seen from the graph that the optical distortion is controlled within ±2%, which means that the optical distortion of the optical lens is well corrected.
Fig. 3 shows a field curve diagram of the optical lens 100, which indicates the degree of curvature of light rays of different wavelengths on a meridional image plane and a sagittal image plane, the horizontal axis indicates the amount of shift (unit: mm), and the vertical axis indicates the half angle of view (unit: °). From the graph, the field curvature of the meridian image plane and the sagittal image plane is controlled within +/-0.05 mm, which indicates that the optical lens can excellently correct the field curvature.
Fig. 4 shows a graph of vertical chromatic aberration of the optical lens 100, which represents chromatic aberration at different image heights on the imaging plane for each wavelength with respect to the center wavelength (0.55 μm), the horizontal axis represents vertical chromatic aberration value (unit: μm) for each wavelength with respect to the center wavelength, and the vertical axis represents normalized field angle. As can be seen from the figure, the vertical axis chromatic aberration of the longest wavelength and the shortest wavelength is controlled within +/-1.5 mu m, which shows that the optical lens can excellently correct chromatic aberration of the edge view field and the secondary spectrum of the whole image surface.
Fig. 5 shows a lateral chromatic aberration diagram of the optical lens 100, which represents aberration of each wavelength on the optical axis at the imaging plane, the horizontal axis represents a lateral chromatic aberration value (unit: mm), and the vertical axis represents a normalized pupil radius. As can be seen from the graph, the offset of the lateral chromatic aberration is controlled within +/-0.025 mm, which indicates that the optical lens can better correct the lateral chromatic aberration.
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 described above, and the difference is mainly that the first lens material is different and the curvature radius, aspheric coefficients and thickness of each lens surface 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 profile 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 distortion curve, a field curvature curve, a vertical axis chromatic aberration curve and a lateral chromatic aberration curve of the optical lens 200 are shown. As can be seen from fig. 7, the optical distortion is controlled within ±2%, which indicates that the distortion of the optical lens 200 is well corrected; as can be seen from fig. 8, the curvature of field is controlled within ±0.04mm, indicating that the curvature of field of the optical lens 200 is better corrected; as can be seen from fig. 9, the vertical chromatic aberration at different wavelengths is controlled within ±2.0 μm, which indicates that the vertical chromatic aberration of the optical lens 200 is well corrected; as can be seen from fig. 10, the lateral chromatic aberration at different wavelengths is controlled within ±0.025mm, which indicates that the lateral chromatic aberration of the optical lens 200 is well corrected.
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 according to the present embodiment is substantially the same as the first embodiment described above, and the difference is mainly that the radius of curvature, aspheric coefficients, and thickness 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 profile 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 distortion curve, a field curvature curve, a vertical axis chromatic aberration curve and a lateral chromatic aberration curve of the optical lens 300 are shown. As can be seen from fig. 12, the optical distortion is controlled within ±2%, indicating that the distortion of the optical lens 300 is well corrected; from fig. 13, it can be seen that the curvature of field is controlled within ±0.04mm, which indicates that the curvature of field of the optical lens 300 is better corrected; as can be seen from fig. 14, the vertical chromatic aberration at different wavelengths is controlled within ±2.0 μm, which indicates that the vertical chromatic aberration of the optical lens 300 is well corrected; as can be seen from fig. 15, the lateral chromatic aberration at different wavelengths is controlled within ±0.025mm, which means that the lateral chromatic aberration of the optical lens 300 is well corrected.
Fourth embodiment
Referring to fig. 16, a schematic structural diagram of an optical lens 400 according to a fourth embodiment of the present invention is shown, and the optical lens 400 according to the present embodiment is substantially the same as the first embodiment, and is mainly different in that the first lens element and the third lens element are made of different materials, the second lens element has a concave object-side surface, and the lens surfaces have different radii of curvature, aspheric coefficients, thicknesses, and materials.
Specifically, the design parameters of the optical lens 400 provided in this embodiment are shown in table 7.
TABLE 7
The aspherical surface profile coefficients of the optical lens 400 in this embodiment are shown in table 8.
TABLE 8
Referring to fig. 17, 18, 19 and 20, a distortion curve, a field curvature curve, a vertical axis chromatic aberration curve and a lateral chromatic aberration curve of the optical lens 400 are shown. As can be seen from fig. 17, the optical distortion is controlled within ±2.5%, indicating that the distortion of the optical lens 400 is well corrected; as can be seen from fig. 18, the curvature of field is controlled within ±0.04mm, which indicates that the curvature of field of the optical lens 400 is better corrected; as can be seen from fig. 19, the vertical chromatic aberration at different wavelengths is controlled within ±1.5μm, which means that the vertical chromatic aberration of the optical lens 400 is well corrected; as can be seen from fig. 20, the lateral chromatic aberration at different wavelengths is controlled within ±0.025mm, which means that the lateral chromatic aberration of the optical lens 400 is well corrected.
Referring to table 9, the optical characteristics of the optical lens provided in the above four embodiments, including the maximum field angle FOV, the total optical length TTL, the half image height IH, the effective focal length f, and the correlation values corresponding to each of the above conditional expressions, are shown.
TABLE 9
As can be seen from the distortion curve graph, the field curvature graph, the vertical axis chromatic aberration graph and the transverse chromatic aberration graph of the above embodiments, the distortion value of the optical lens in each embodiment is within +/-3%, the field curvature value is within +/-0.05 mm, the vertical axis chromatic aberration is within +/-2 μm, and the transverse chromatic aberration is within +/-0.03, which indicates that the optical lens provided by the invention has the advantages of high imaging quality, large field angle, large aperture, miniaturization and the like, and simultaneously has good resolution.
In summary, the optical lens provided by the invention adopts a combination of one glass spherical lens and five plastic aspherical lenses, and the optical lens has the advantages of large field angle, high image quality, low sensitivity, miniaturization and large aperture through specific surface shape collocation and reasonable focal power distribution.
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 (10)
1. An optical lens comprising six lenses in order from an object side to an imaging surface along an optical axis, comprising:
a first lens with negative focal power, wherein the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface;
a second lens having negative optical power, an image side surface of the second lens being a concave surface;
a third lens having positive optical power, an image side surface of the third lens being a convex surface;
a diaphragm;
a fourth lens element with positive refractive power, wherein the object-side surface of the fourth lens element is convex, and the image-side surface of the fourth lens element is convex;
a fifth lens with negative focal power, wherein an object side surface of the fifth lens is a concave surface, and an image side surface of the fifth lens is a concave surface;
a sixth lens having positive optical power, an object side surface of the sixth lens being a convex surface;
wherein, the material refractive index Nd1 of the first lens and the effective focal length f1 of the first lens satisfy: -Nd 1/f1 < -0.3.
2. The optical lens according to claim 1, wherein the optical lens satisfies the following conditional expression:
0.1＜f/TTL＜0.15；
wherein TTL represents the total optical length of the optical lens, and f represents the effective focal length of the optical lens.
3. The optical lens according to claim 1, wherein the optical lens satisfies the following conditional expression:
0.15＜IH/TTL＜0.25；
wherein IH represents half image height of the optical lens, and TTL represents total optical length of the optical lens.
4. The optical lens according to claim 1, wherein the optical lens satisfies the following conditional expression:
0.3＜IH/FNO＜0.8；
wherein IH represents the half image height of the optical lens, and FNO represents the f-number of the optical lens.
5. The optical lens according to claim 1, wherein the optical lens satisfies the following conditional expression:
160°＜FOV＜180°；
4.5＜FOV/(2Π×TTL)＜5.5；
wherein FOV represents the maximum field angle of the optical lens, TTL represents the total optical length of the optical lens, and pi is equal to 3.1415926535.
6. The optical lens according to claim 1, wherein the optical lens satisfies the following conditional expression:
wherein R21 represents the radius of curvature of the object side surface of the second lens, and f represents the effective focal length of the optical lens.
7. The optical lens according to claim 1, wherein the optical lens satisfies the following conditional expression:
-1.0＜（1/f2-1/f3）/（1/f）＜-0.6；
wherein f represents an effective focal length of the optical lens, f2 represents an effective focal length of the second lens, and f3 represents an effective focal length of the third lens.
8. The optical lens according to claim 1, wherein the optical lens satisfies the following conditional expression:
-1.5＜f5/f＜-0.5；
-4.5＜(R51+R52)/(R51-R52)＜-2.0；
wherein f5 represents an effective focal length of the fifth lens, f represents an effective focal length of the optical lens, R51 represents a radius of curvature of an object-side surface of the fifth lens, and R52 represents a radius of curvature of an image-side surface of the fifth lens.
9. The optical lens according to claim 1, wherein the optical lens satisfies the following conditional expression:
0.03＜IH/[f×tan(FOV/2)]＜0.1；
wherein IH represents half image height of the optical lens, f represents effective focal length of the optical lens, and FOV represents maximum field angle of the optical lens.
10. The optical lens according to claim 1, wherein the optical lens satisfies the following conditional expression:
wherein f4 represents an effective focal length of the fourth lens, f5 represents an effective focal length of the fifth lens, f6 represents an effective focal length of the sixth lens, and f represents an effective focal length of the optical lens.
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