CN115128779B - Optical lens - Google Patents
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- CN115128779B CN115128779B CN202211037346.XA CN202211037346A CN115128779B CN 115128779 B CN115128779 B CN 115128779B CN 202211037346 A CN202211037346 A CN 202211037346A CN 115128779 B CN115128779 B CN 115128779B
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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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Abstract
The invention discloses an optical lens, which comprises the following components in sequence from an object side to an imaging surface along an optical axis: a first lens having a negative optical power, an object-side surface of the first lens being concave at a paraxial region and an image-side surface of the first lens being concave; the second lens with focal power is characterized in that the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a concave surface; the image side surface of the third lens is a convex surface; a diaphragm; the fourth lens is provided with 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 lens comprises 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 convex surface; and the object side surface of the sixth lens is a convex surface. The optical lens has the advantages of large image surface, high pixels and small distortion.
Description
Technical Field
The invention relates to the technical field of optical lenses, in particular to an optical lens.
Background
With the rapid development of the mobile internet and the popularity of social, video and live broadcast software, people have higher and higher liking degree on photography; the network live broadcast industry is widely regarded as a new industry, and the live broadcast industry becomes a phenomenon-level industry trend. Meanwhile, the demand of consumers for the live webcast lens is increasing day by day, the pursuit of the imaging effect is more diversified, and both high-definition image quality and a wider viewing angle and a larger image plane are required to record more information.
Because wide-angle lens ubiquitous has great distortion, can make marginal imaging effect relatively poor, and because wide-angle lens's effective focal length is shorter, peripheral light gets into and has great compression deformation, and these make general wide-angle lens hardly satisfy the demand of the live industry of network.
Disclosure of Invention
Therefore, an object of the present invention is to provide an optical lens having advantages of a large image plane, high pixels, and small distortion.
The invention provides an optical lens, which sequentially comprises the following components from an object side to an imaging surface along an optical axis: a first lens having a negative optical power, an object-side surface of the first lens being concave at a paraxial region and an image-side surface of the first lens being concave; the second lens with focal power is characterized in that the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a concave surface; the image side surface of the third lens is a convex surface; a diaphragm; the fourth lens is provided with 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 lens comprises 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 convex surface; and the object side surface of the sixth lens is a convex surface.
Compared with the prior art, the optical lens provided by the invention adopts the reasonable collocation of six lenses with specific focal power and surface shapes, so that the optical lens has the advantages of large image surface and long focal length, and can be matched with a large target surface imaging chip to realize high-definition imaging; meanwhile, the size of the clear aperture of the lens is reasonably configured, so that the light inlet quantity of the system can be enlarged, the imaging quality of the system in a dark environment can be effectively guaranteed, and the use requirement of the current market on the lens in the network live broadcast industry can be better met.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of 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 field curvature diagram of an optical lens according to a first embodiment of the present invention;
FIG. 3 is a distortion curve diagram of an optical lens according to a first embodiment of the present invention;
FIG. 4 is a graph illustrating axial chromatic aberration of an optical lens according to a first embodiment of the present invention;
FIG. 5 is a vertical axis chromatic aberration diagram of an optical lens according to a first embodiment of the present invention;
FIG. 6 is a diagram illustrating an optical lens assembly according to a second embodiment of the present invention;
FIG. 7 is a field curvature graph of an optical lens according to a second embodiment of the present invention;
FIG. 8 is a distortion curve diagram of an optical lens according to a second embodiment of the present invention;
FIG. 9 is a graph illustrating axial chromatic aberration of an optical lens according to a second embodiment of the present invention;
FIG. 10 is a vertical axis chromatic aberration diagram of an optical lens according to a second embodiment of the present invention;
FIG. 11 is a diagram illustrating an optical lens assembly according to a third embodiment of the present invention;
FIG. 12 is a field curvature graph of an optical lens according to a third embodiment of the present invention;
fig. 13 is a distortion graph of an optical lens according to a third embodiment of the present invention;
FIG. 14 is a graph illustrating 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;
FIG. 16 is a diagram illustrating an optical lens assembly according to a fourth embodiment of the present invention;
FIG. 17 is a field curvature graph of an optical lens according to a fourth embodiment of the present invention;
fig. 18 is a distortion graph of an optical lens according to a fourth embodiment of the present invention;
FIG. 19 is a graph showing axial chromatic aberration of an optical lens according to a fourth embodiment of the present invention;
fig. 20 is a vertical axis chromatic aberration diagram of an optical lens according to a fourth embodiment of the present invention.
Detailed Description
In order to make the objects, features and advantages of the present invention more comprehensible, embodiments accompanying figures are described in detail below. Several embodiments of the invention are presented in the drawings. 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 sequentially comprises the following components from an object side to an imaging surface along an optical axis: the lens comprises a first lens, a second lens, a third lens, a diaphragm, a fourth lens, a fifth lens, a sixth lens and an optical filter.
Specifically, the first lens has a negative optical power, the object-side surface of the first lens is concave at the paraxial region, and the image-side surface of the first lens is concave; the first lens is arranged in a biconcave surface type, and can collect light rays in a wider range to enter the rear optical lens.
The second lens has focal power, and the object side surface of the second lens is a convex surface; the image side surface of the second lens is a concave surface;
the third lens has positive focal power, and the image side surface of the third lens is a convex surface;
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 fourth lens adopts the biconvex setting, can make the comparatively gentle entering rear system of light after dispersing, reduces the correction degree of difficulty of aberration.
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 convex surface; the focal power and the surface type of the fifth lens are arranged to be beneficial to avoiding the excessive divergence of the light rays at the rear part.
The sixth lens has positive focal power, and the object side surface of the sixth lens is a convex surface; the focal power and the surface shape of the sixth lens are arranged, so that more light beams can be effectively transmitted to an imaging surface, the area of the image surface is effectively increased, and the resolution is improved.
As an embodiment, the second lens element may have a negative refractive power, the image-side surface of the sixth lens element is a convex surface, and the optical lens system satisfies the following conditional expressions:
-1<R61/R62<0；（1）
wherein R61 denotes a radius of curvature of an object-side surface of the sixth lens element, and R62 denotes a radius of curvature of an image-side surface of the sixth lens element. Satisfy above-mentioned conditional expression (1), through the face type of reasonable setting sixth lens, be favorable to expanding the exit angle of the light that jets out from sixth lens, can make the more effective transmission of light beam to the imaging surface to make the camera lens have great imaging surface.
As an embodiment, the optical lens satisfies the following conditional expression:
-2.5<f1/f6<-1.2；（2）
where f1 denotes a focal length of the first lens, and f6 denotes a focal length of the sixth lens. Satisfy above-mentioned conditional expression (2), through the focus ratio of reasonable setting first lens and sixth lens, be favorable to improving the imaging range for this optical lens has the characteristics of big image plane.
As an embodiment, the optical lens satisfies the following conditional expression:
0.5<f6/f<1；（3）
-1.5<(R61+R62)/(R61-R62)<-0.2；（4）
where f6 denotes a focal length of the sixth lens, f denotes an effective focal length of the optical lens, R61 denotes a radius of curvature of an object-side surface of the sixth lens, and R62 denotes a radius of curvature of an image-side surface of the sixth lens. Satisfying the conditional expressions (3) and (4) can make the sixth lens have a proper focal length and surface shape, which is beneficial to balancing astigmatism and aberration of the optical system and improving the overall imaging quality.
As an embodiment, the optical lens satisfies the following conditional expression:
0.9<f/IH<1.15；（5）
wherein f represents an effective focal length of the optical lens, and IH represents an image height corresponding to a maximum half field angle of the optical lens. Satisfying above-mentioned conditional expression (5), can guaranteeing that optical lens has great imaging surface, can satisfy the imaging demand of big target surface chip.
As an embodiment, the optical lens satisfies the following conditional expression:
7.5mm/rad<IH/θ<9mm/rad；（6）
where θ represents a maximum half angle of view of the optical lens, and IH represents an image height corresponding to the maximum half angle of view of the optical lens. Satisfying the above conditional expression (6), can realize the large image plane of camera lens and the equilibrium of wide visual angle, still make optical lens have less optical distortion simultaneously, make marginal visual field and central visual field have higher image quality the same.
In one embodiment, the optical lens satisfies the following conditional expression:
2.2<CT6/ET6<6.5；（7）
wherein CT6 denotes a center thickness of the sixth lens, and ET6 denotes an edge thickness of the sixth lens. Satisfy above-mentioned conditional expression (7), through setting up the sixth lens for the middle lens that the edge is thin thick, convergence light that can be better reduces the correction degree of difficulty of aberration, is favorable to improving the imaging quality, improves whole imaging quality.
In one embodiment, the optical lens satisfies the following conditional expression:
0.7<DM1/DM6<1.2；（8）
where DM1 denotes an optical effective diameter of the first lens, and DM6 denotes an optical effective diameter of the sixth lens. The condition (8) is satisfied, so that the light beam entering the optical system through the first lens can be transmitted to the imaging surface to the maximum extent through the sixth lens, the imaging quality is improved, and the image quality is improved.
As an embodiment, the optical lens satisfies the following conditional expression:
3<TTL/f<3.5；（9）
wherein, TTL represents the optical total length of the optical lens, and f represents the effective focal length of the optical lens. Satisfying above-mentioned conditional expression (9), can making the effect of the overall length and the telephoto of camera lens better balanced of camera lens, help promoting the ability that the camera lens highlights the main part and shoot the long shot.
As an embodiment, the optical lens satisfies the following conditional expression:
6mm<f<7mm；（10）
6mm<IH<7mm；（11）
wherein f represents an effective focal length of the optical lens, and IH represents an image height corresponding to a maximum half field angle of the optical lens. Satisfying the conditional expressions (10) and (11), the lens can have a larger focal length, which is helpful for improving the capability of the lens for highlighting the main body; meanwhile, the lens has a larger imaging surface, and the imaging requirement of a large target surface chip can be met.
As an embodiment, the optical lens may further satisfy the following conditional expression:
0.95<DM41/D<1.5；（12）
where D denotes a stop diameter of the optical lens, and DM41 denotes an effective diameter of an object side surface of the fourth lens. Satisfying above-mentioned conditional expression (12), can better control the propagation between diaphragm aperture to the fourth lens, can reduce the loss of luminous flux in the transmission process, be favorable to improving imaging quality for this optical lens also can normally shoot in darker environment.
As an embodiment, the optical lens satisfies the conditional expression:
3<(R21+R22)/CT2<8；（13）
wherein R21 denotes a radius of curvature of an object-side surface of the second lens, R22 denotes a radius of curvature of an image-side surface of the second lens, and CT2 denotes a center thickness of the second lens. Satisfying the above conditional expression (13), the surface shape and thickness of the second lens can be reasonably controlled, and the influence of the center thickness on the eccentricity is reduced, thereby effectively improving the tolerance of the optical system and improving the yield of the lens.
As an embodiment, the optical lens satisfies the following conditional expression:
-0.5<(R21-R22)/(R21+R22)<0.5；（14）
wherein R21 denotes a radius of curvature of an object-side surface of the second lens, and R22 denotes a radius of curvature of an image-side surface of the second lens. The condition formula (14) is satisfied, the surface shape of the second lens can be effectively restricted, and the second lens is matched with other lenses to effectively improve the aberration of the middle field of view and improve the image quality.
As an embodiment, the optical lens satisfies the following conditional expression:
0<(AC23+CT3)/CT2<2；（15）
where AC23 denotes an air gap on the optical axis of the second lens and the third lens, CT2 denotes a center thickness of the second lens, and CT3 denotes a center thickness of the third lens. The condition expression (15) is satisfied, so that MTF of the lens can be improved, and the overall image quality can be improved.
As an embodiment, the optical lens satisfies the following conditional expression:
2.5<(f3+f4)/f<4.5；（16）
wherein f3 denotes a focal length of the third lens, f4 denotes a focal length of the fourth lens, and f denotes an effective focal length of the optical lens. Satisfy above-mentioned conditional expression (16), through the focus value of reasonable third lens and fourth lens around setting up the diaphragm, the distortion of correction system can be better, reduces the distortion value of marginal visual field, improves the imaging quality in the whole visual field.
As an embodiment, the optical lens may further satisfy the following conditional expression:
0.1<(CT4+AC45)/TTL<0.3；（17）
wherein CT4 denotes a center thickness of the fourth lens, AC45 denotes an air gap on an optical axis of the fourth lens and the fifth lens, and TTL denotes an optical total length of the optical lens. Satisfy above-mentioned conditional expression (17), account for than through the thickness of reasonable setting fourth lens in the whole camera lens, can promote the tolerance better and optimize the space, be favorable to improving the camera lens yield.
As an embodiment, the optical lens satisfies the following conditional expression:
-0.5<(R41+R42)/(R41-R42)<1；（18）
wherein R41 denotes a radius of curvature of an object-side surface of the fourth lens, and R42 denotes a radius of curvature of an image-side surface of the fourth lens. Satisfying the conditional expression (18), the surface type of the fourth lens is controlled to improve the tolerance of the device, thereby improving the yield of the lens.
As an embodiment, the optical lens satisfies the following conditional expression:
-8<(R51+R52)/CT5<-3；（19）
wherein R51 denotes a radius of curvature of an object-side surface of the fifth lens, R52 denotes a radius of curvature of an image-side surface of the fifth lens, and CT5 denotes a center thickness of the fifth lens. By satisfying the conditional expression (19) and controlling the surface shape and the center thickness of the fifth lens, the restriction of the fifth lens on the optical performance can be reduced, and the resolution level can be effectively improved.
In one embodiment, the first lens element, the second lens element, the third lens element, the fourth lens element, the fifth lens element and the sixth lens element may all be aspheric lens elements, or may be a combination of spherical and non-curved lens elements; optionally, the lenses are aspheric lenses, so that the number of the lenses can be effectively reduced, aberration can be corrected, and better optical performance can be provided.
The invention is further illustrated below by means of a number of examples. In various embodiments, the thickness, the curvature radius, and the material selection of each lens in the optical lens are different, and the specific differences can be referred to in the parameter tables of the various embodiments. The following examples are only preferred embodiments of the present invention, but the embodiments of the present invention are not limited by the following examples, and any other changes, substitutions, combinations or simplifications which do not depart from the gist of the present invention should be construed as being equivalent replacements within the scope of the present invention.
In each embodiment of the present invention, when the lens in the optical lens is an aspheric lens, the aspheric surface shape of the lens satisfies the following equation:
wherein z represents the rise of the distance between the aspheric surface and the aspheric surface vertex in the optical axis direction at the position of height h, c is the paraxial curvature of the surface, k is the conic coefficient, A 2i The coefficient of the aspheric surface type of the 2 i-th order.
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 sequentially includes, from an object side to an image plane S15 along a paraxial direction: a first lens L1, a second lens L2, a third lens L3, an aperture 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 optical power, the object-side surface S1 of the first lens element is concave at the paraxial region, and the image-side surface S2 of the first lens element is concave;
the second lens L2 has positive 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 L3 has positive focal power, the object side surface S5 of the third lens is a concave surface, and the image side surface S6 of the third lens is a convex surface;
the fourth lens L4 has positive focal power, the object-side surface S7 of the fourth lens is a convex surface, and the image-side surface S8 of the fourth lens is a convex surface;
the fifth lens L5 has negative focal power, the object-side surface S9 of the fifth lens is a concave surface, and the image-side surface S10 of the fifth lens is a convex surface;
the sixth lens element L6 has positive refractive power, and has a convex object-side surface S11 and a concave image-side surface S12.
In order to correct the aberration of the system better, the first lens element L1, the second lens element L2, the third lens element L3, the fourth lens element L4, the fifth lens element L5 and the sixth lens element L6 are all plastic aspheric lenses.
Specifically, the design parameters of the optical lens 100 provided in this embodiment are shown in table 1.
TABLE 1
In this embodiment, aspheric parameters of each lens in the optical lens 100 are shown in table 2.
TABLE 2
Referring to fig. 2, fig. 3, fig. 4 and fig. 5, a field curvature curve graph, a distortion curve graph, an axial chromatic aberration graph and a vertical chromatic aberration graph of the optical lens 100 are shown, respectively.
The field curvature curve of fig. 2 indicates the degree of curvature of the meridional image plane and the sagittal image plane. In fig. 2, the horizontal axis represents the offset amount (unit: mm) and the vertical axis represents the angle of view (unit: degree). As can be seen from fig. 2, the field curvature of the meridional image plane and the sagittal image plane is controlled within ± 0.10mm, which indicates that the field curvature of the optical lens 100 is well corrected.
The distortion curve of fig. 3 represents the distortion at different image heights on the imaging plane. In fig. 3, the horizontal axis represents the distortion percentage, and the vertical axis represents the angle of view (unit: degree). As can be seen from fig. 3, the distortion at different image heights on the image plane is controlled within ± 2%, which indicates that the distortion of the optical lens 100 is well corrected.
The axial chromatic aberration curve of fig. 4 represents the aberration on the optical axis at the imaging plane. In FIG. 4, the horizontal axis represents a sphere value (unit: mm) and the vertical axis represents a normalized pupil radius. As can be seen from fig. 4, the offset of the axial chromatic aberration is controlled within ± 0.035mm, which indicates that the axial chromatic aberration of the optical lens 100 is well corrected.
The vertical axis chromatic aberration curve of fig. 5 shows chromatic aberration at different image heights on the image forming surface for the longest wavelength and the shortest wavelength. In fig. 5, the horizontal axis represents the homeotropic color difference (unit: μm) of each wavelength with respect to the center wavelength, and the vertical axis represents the normalized angle of view. As can be seen from fig. 5, the vertical chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ± 4.5 microns, which indicates that the optical lens 100 can effectively correct the aberration of the fringe field and the secondary spectrum of the entire image plane.
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, where the optical lens 200 according to the second embodiment of the present invention has substantially the same structure as the optical lens 100 according to the first embodiment of the present invention, and mainly includes that the second lens element L2 has negative power, the object-side surface S5 of the third lens element is a convex surface, the image-side surface S12 of the sixth lens element is a convex surface, and curvature radii and material selections of the respective lens elements are different.
The present embodiment provides the relevant parameters of each lens in the optical lens 200 as shown in table 3.
TABLE 3
The surface shape coefficients of the respective aspherical surfaces of the optical lens 200 in the present embodiment are shown in table 4.
TABLE 4
Referring to fig. 7, 8, 9 and 10, a field curvature curve graph, a distortion curve graph, an axial chromatic aberration graph and a vertical chromatic aberration graph of the optical lens 200 are shown, respectively.
The field curvature of fig. 7 indicates the degree of curvature of the meridional image plane and the sagittal image plane. As can be seen from fig. 7, the field curvature of the meridional image plane and the sagittal image plane is controlled within ± 0.05mm, which indicates that the field curvature correction of the optical lens 200 is good.
The distortion curve of fig. 8 represents the distortion at different image heights on the imaging plane. As can be seen from fig. 8, the distortion at different image heights on the image plane is controlled within ± 2.8%, which indicates that the distortion of the optical lens 200 is well corrected.
The axial chromatic aberration curve of fig. 9 represents the aberration on the optical axis at the imaging plane. 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.
The vertical axis chromatic aberration curve of fig. 10 shows chromatic aberration at different image heights on the image forming surface for the longest wavelength and the shortest wavelength. As can be seen from fig. 10, the vertical chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ± 4 μm, which indicates that the optical lens 200 can effectively correct the aberration of the fringe field and the secondary spectrum of the entire image plane.
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, where the optical lens 300 according to the third embodiment of the present invention has substantially the same structure as the optical lens 100 according to the first embodiment of the present invention, and mainly includes that an object-side surface S5 of the third lens element is a convex surface, an image-side surface S12 of the sixth lens element is a convex surface, and curvature radii and material choices of the respective lenses are different.
The parameters related to each lens of the optical lens 300 provided in this embodiment are shown in table 5.
TABLE 5
In the present embodiment, aspheric parameters of each lens in the optical lens 300 are shown in table 6.
TABLE 6
Referring to fig. 12, 13, 14 and 15, a field curvature curve graph, a distortion curve graph, an axial chromatic aberration graph and a vertical chromatic aberration graph of the optical lens 300 are shown, respectively.
The field curvature curve of fig. 12 indicates the degree of curvature of the meridional image plane and the sagittal image plane. As can be seen from fig. 12, the field curvature of the meridional image plane and the sagittal image plane is controlled within ± 0.1mm, which indicates that the field curvature correction of the optical lens 300 is good.
The distortion curve of fig. 13 represents the distortion at different image heights on the image plane. As can be seen from fig. 13, the distortion at different image heights on the image plane is controlled to be within 3%, indicating that the distortion of the optical lens 300 is well corrected.
The axial chromatic aberration curve of fig. 14 represents the aberration on the optical axis at the imaging plane. As can be seen from fig. 14, the offset of the axial chromatic aberration is controlled within ± 0.035mm, which indicates that the axial chromatic aberration of the optical lens 300 is well corrected.
The vertical axis chromatic aberration curve of fig. 15 shows chromatic aberration at different image heights on the image forming surface for the longest wavelength and the shortest wavelength. As can be seen from fig. 15, the vertical chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ± 5 μm, which indicates that the optical lens 300 can effectively correct the aberration of the fringe field and the secondary spectrum of the entire image plane.
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, where the optical lens 400 according to the fourth embodiment of the present invention has substantially the same structure as the optical lens 100 according to the first embodiment, and mainly includes that an object-side surface S5 of the third lens element is a convex surface, an image-side surface S12 of the sixth lens element is a convex surface, and curvature radii and material choices of the respective lens elements are different.
The parameters related to each lens in the optical lens 400 provided in this embodiment are shown in table 7.
TABLE 7
The surface shape coefficients of the aspherical surfaces of the optical lens 400 in the present embodiment are shown in table 8.
TABLE 8
Referring to fig. 17, 18, 19 and 20, a field curvature graph, a distortion graph, an axial chromatic aberration graph and a vertical axis chromatic aberration graph of the optical lens 400 are respectively shown.
The field curvature curve of fig. 17 indicates the degree of curvature of the meridional image plane and the sagittal image plane. As can be seen from fig. 17, the field curvature of the meridional image plane and the sagittal image plane is controlled within ± 0.1mm, which indicates that the field curvature correction of the optical lens 400 is good.
The distortion curve of fig. 18 represents the distortion at different image heights on the imaging plane. As can be seen from fig. 18, the distortion at different image heights on the image plane is controlled within ± 2.5%, indicating that the distortion of the optical lens 400 is well corrected.
The axial chromatic aberration curve of fig. 19 represents the aberration on the optical axis at the imaging plane. As can be seen from fig. 19, the shift amount of the axial chromatic aberration is controlled within ± 0.03mm, which indicates that the axial chromatic aberration of the optical lens 400 is well corrected.
The vertical axis chromatic aberration curve in fig. 20 shows chromatic aberration at different image heights on the image forming surface for the longest wavelength and the shortest wavelength. As can be seen from fig. 20, the vertical chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ± 4.5 microns, which indicates that the optical lens 400 can effectively correct the aberration of the fringe field and the secondary spectrum of the entire image plane.
Table 9 shows the optical characteristics corresponding to the above four embodiments, which mainly include the effective focal length f, the total optical length TTL, the maximum field angle 2 θ, the image height IH corresponding to the maximum half field angle, and the values corresponding to each of the above conditional expressions.
TABLE 9
In summary, the optical lens provided by the invention has at least the following advantages:
(1) Six aspheric lenses with specific focal power are adopted, and reasonable collocation of specific surface types and different focal powers is adopted, so that the optical lens has a large imaging surface and a large visual field angle, and small distortion is realized, the large visual field and high pixels can be well balanced, and the requirements of the current network live broadcast market on the high-definition lens are met.
(2) The lens in the optical lens has the advantages of large caliber, moderate thickness, easy molding and good processing, and can effectively reduce the production cost.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean 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 invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. 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-mentioned embodiments only express several embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that various changes and modifications can be made by those skilled in the art without departing from the spirit of the invention, and these changes and modifications are all within the scope of the invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (10)
1. An optical lens, comprising, in order from an object side to an image plane along an optical axis:
a first lens having a negative optical power, an object-side surface of the first lens being concave at a paraxial region and an image-side surface of the first lens being concave;
the second lens with focal power is characterized in that the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a concave surface;
the image side surface of the third lens is a convex surface;
a diaphragm;
the lens comprises a fourth lens with positive focal power, wherein 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 lens system comprises a fifth lens with negative focal power, a second lens with negative focal power, a third lens with negative focal power and a fourth 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 convex surface;
a sixth lens with positive focal power, wherein the object side surface of the sixth lens is a convex surface;
the optical lens satisfies the following conditional expression:
0.9<f/IH<1.15；
where f denotes an effective focal length of the optical lens, and IH denotes an image height corresponding to a maximum half field angle of the optical lens.
2. An optical lens according to claim 1, wherein the second lens element has a negative power, the image-side surface of the sixth lens element is convex, and the optical lens satisfies the following conditional expression:
-1<R61/R62<0；
wherein R61 denotes a radius of curvature of an object-side surface of the sixth lens element, and R62 denotes a radius of curvature of an image-side surface of the sixth lens element.
3. An optical lens according to claim 1, characterized in that the optical lens satisfies the following conditional expression:
-2.5<f1/f6<-1.2；
where f1 denotes a focal length of the first lens, and f6 denotes a focal length of the sixth lens.
4. An optical lens according to claim 1, characterized in that the optical lens satisfies the following conditional expression:
0.5<f6/f<1；
-1.5<(R61+R62)/(R61-R62)<-0.2；
where f6 denotes a focal length of the sixth lens, f denotes an effective focal length of the optical lens, R61 denotes a radius of curvature of an object-side surface of the sixth lens, and R62 denotes a radius of curvature of an image-side surface of the sixth lens.
5. An optical lens according to claim 1, characterized in that the optical lens satisfies the following conditional expression:
7.5mm/rad<IH/θ<9mm/rad；
where θ represents a maximum half angle of view of the optical lens, and IH represents an image height corresponding to the maximum half angle of view of the optical lens.
6. An optical lens according to claim 1, characterized in that the optical lens satisfies the following conditional expression:
2.2<CT6/ET6<6.5；
wherein CT6 denotes a center thickness of the sixth lens, and ET6 denotes an edge thickness of the sixth lens.
7. An optical lens according to claim 1, characterized in that the optical lens satisfies the following conditional expression:
0.7<DM1/DM6<1.2；
where DM1 denotes an optical effective diameter of the first lens, and DM6 denotes an optical effective diameter of the sixth lens.
8. An optical lens according to claim 1, characterized in that the optical lens satisfies the following conditional expression:
3<TTL/f<3.5；
wherein, TTL represents the optical total length of the optical lens, and f represents the effective focal length of the optical lens.
9. An optical lens according to claim 1, characterized in that the optical lens satisfies the following conditional expression:
6mm<f<7mm；
6mm<IH<7mm；
wherein f represents an effective focal length of the optical lens, and IH represents an image height corresponding to a maximum half field angle of the optical lens.
10. An optical lens according to claim 1, characterized in that the optical lens satisfies the following conditional expression:
0.95<DM41/D<1.5；
where D denotes a stop diameter of the optical lens, and DM41 denotes an effective diameter of an object side surface of the fourth lens.
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