CN115220202B - Wide-angle lens - Google Patents
Wide-angle lens Download PDFInfo
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- CN115220202B CN115220202B CN202211146695.5A CN202211146695A CN115220202B CN 115220202 B CN115220202 B CN 115220202B CN 202211146695 A CN202211146695 A CN 202211146695A CN 115220202 B CN115220202 B CN 115220202B
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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
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/04—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of organic materials, e.g. plastics
- G02B1/041—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
- G02B13/001—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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Abstract
The invention discloses a wide-angle lens, which comprises the following components in sequence from an object side to an imaging surface along an optical axis: the first lens with negative focal power has a convex object-side surface and a concave image-side surface; a second lens element having a negative optical power, an object-side surface of the second lens element being concave at a paraxial region thereof, and an image-side surface of the second lens element being concave; a third lens element having a negative power, a concave object-side surface, and a convex image-side surface at a paraxial region; a fourth lens having a positive refractive power, both the object-side surface and the image-side surface of the fourth lens being convex; a diaphragm; a fifth lens element having a positive refractive power, the object-side surface and the image-side surface of the fifth lens element being convex; a sixth lens element with negative refractive power having a convex object-side surface and a concave image-side surface; a seventh lens with positive focal power, the image side surface of which is convex; an eighth lens element having a negative refractive power, an object-side surface of which is concave; a ninth lens having a negative optical power, an image-side surface of which is concave at a paraxial region. The wide-angle lens has the advantages of good thermal stability, large field angle and high pixels.
Description
Technical Field
The invention relates to the technical field of optical lens imaging, in particular to a wide-angle lens.
Background
The panoramic technology is a novel vision technology which is developed rapidly at present, and images shot by one or a plurality of wide-angle lenses are spliced and synthesized by using a panoramic imaging device, so that a 360-degree panoramic image in the horizontal direction can be obtained. Because wide-angle lens has the characteristic of wide visual angle, can shoot the strong picture of visual impact on a large scale, can shoot more picture contents down, consequently can satisfy some scenes that have special demands to the image range, can be applied to motion camera, unmanned aerial vehicle, on-vehicle image, meeting video equipment etc.. Nowadays, in order to obtain a clearer imaging picture and a wider viewing angle, the imaging quality requirement of a wide-angle lens is higher and higher.
The wide-angle lens is wide in application scene and can be used in complex environments such as severe vibration, high pressure, high temperature and low temperature, so that the performance requirement of the matched wide-angle lens is high, good thermal stability is required to meet changeable use environments such as high temperature and low temperature, smaller volume and weight are required, and meanwhile, a chip with high pixels can be matched to meet the requirement that clear and vivid pictures can be shot in different use scenes. At present, the common wide-angle lens on the market hardly meets diversified use requirements.
Disclosure of Invention
Based on this, an object of the present invention is to provide a wide-angle lens at least for solving the above-described problems.
The invention provides a wide-angle 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 with negative focal power, a second lens and a third lens, 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 a negative optical power, an object-side surface of the second lens being concave at a paraxial region, an image-side surface of the second lens being concave;
a third lens element having a negative optical power, the third lens element having a concave object-side surface and a convex image-side surface at a paraxial region;
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;
a diaphragm;
the lens comprises a fifth lens with positive focal power, wherein the object side surface of the fifth lens is a convex surface, and the image side surface of the fifth lens is a convex surface;
the sixth lens with negative focal power is characterized in that the object side surface of the sixth lens is a convex surface, and the image side surface of the sixth lens is a concave surface;
the seventh lens with positive focal power, the image side surface of the seventh lens is a convex surface;
an eighth lens having a negative optical power, an object side surface of the eighth lens being a concave surface;
a ninth lens having a negative optical power, an image-side surface of the ninth lens being concave at a paraxial region;
the wide-angle lens comprises at least one glass lens and one plastic lens.
Compared with the prior art, the wide-angle lens provided by the invention adopts a nine-glass-plastic mixed lens structure, and has smaller volume and weight and better thermal stability through specific focal power combination and surface type collocation, so that high-definition imaging of the lens in high and low temperature environments can be realized; meanwhile, the wide-angle lens also has an ultra-large field angle, can shoot pictures in a large range, and can well meet diversified use requirements.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.
Fig. 1 is a schematic structural view of a wide-angle lens provided in a first embodiment of the present invention;
FIG. 2 is a field curvature diagram of a wide-angle lens according to a first embodiment of the present invention;
FIG. 3 is a graph showing axial chromatic aberration of a wide-angle lens according to a first embodiment of the present invention;
FIG. 4 is a vertical axis chromatic aberration diagram of the wide-angle lens according to the first embodiment of the present invention;
fig. 5 is a schematic structural diagram of a wide-angle lens provided in a second embodiment of the present invention;
FIG. 6 is a field curvature diagram of a wide-angle lens according to a second embodiment of the present invention;
FIG. 7 is a graph showing axial chromatic aberration of a wide-angle lens according to a second embodiment of the present invention;
FIG. 8 is a vertical axis chromatic aberration diagram of a wide-angle lens according to a second embodiment of the present invention;
fig. 9 is a schematic structural view of a wide-angle lens provided in a third embodiment of the present invention;
fig. 10 is a field curvature diagram of a wide-angle lens according to a third embodiment of the present invention;
FIG. 11 is a graph showing axial chromatic aberration of a wide-angle lens according to a third embodiment of the present invention;
fig. 12 is a vertical axis chromatic aberration diagram of a wide-angle lens according to a third embodiment of the present invention;
fig. 13 is a schematic structural view of a wide-angle lens provided in a fourth embodiment of the present invention;
fig. 14 is a field curvature graph of a wide-angle lens according to a fourth embodiment of the present invention;
FIG. 15 is a graph showing axial chromatic aberration of a wide-angle lens according to a fourth embodiment of the present invention;
fig. 16 is a vertical axis chromatic aberration diagram of the wide-angle lens according to the fourth embodiment of the present invention.
Detailed Description
In order to make the objects, features and advantages of the present invention comprehensible, embodiments accompanied with 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 a wide-angle lens, which comprises the following components in sequence 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 fourth lens, a diaphragm, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens and an optical filter.
The first lens has negative focal power, 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 element has a negative optical power, and has a concave object-side surface at a paraxial region and a concave image-side surface;
the third lens element has a negative focal power, a concave object-side surface and a convex image-side surface at a 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 positive focal power, the object side surface of the fifth lens is a convex surface, and the image side surface of the fifth lens is a convex surface;
the sixth lens has negative 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 concave surface;
the seventh lens has positive focal power, and the image side surface of the seventh lens is a convex surface;
the eighth lens has negative focal power, and the object side surface of the eighth lens is a concave surface;
the ninth lens has a negative power, and an image-side surface thereof is concave at a paraxial region.
The wide-angle lens contains at least one glass lens and a plastic lens, adopts the glass to mould the lens structure of mixing collocation, has not only effectively reduced the volume and the weight of camera lens, has improved the resolving power of whole group camera lens moreover, has reduced the exit angle of distortion and chief ray, has effectively balanced the compromise of angle of vision and image quality, has guaranteed the imaging stability of camera lens in high and low temperature environment simultaneously. In some embodiments, the first lens and the fourth lens are made of glass lenses, and the other lenses are made of plastic lenses, so that the problem of lens temperature focus drift is effectively solved, and the resolving power of the lens in a high-temperature and low-temperature environment is ensured.
In some embodiments, the wide-angle lens satisfies the following conditional expression:
-5<f2/f<-1；（1）
-6<R21/R22<-1；（2）
where f2 denotes a focal length of the second lens, f denotes an effective focal length of the wide-angle lens, 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. Satisfying the above conditional expressions (1) and (2), the second lens has appropriate negative focal power and surface shape, which is beneficial to the light entering the system more smoothly, reduces the difficulty of aberration correction, and improves the resolving power of the optical lens.
In some embodiments, the wide-angle lens satisfies the following conditional expression:
-0.2<f/f3<0；（3）
0.1<R31/R32<1；（4）
where f3 denotes a focal length of the third lens, f denotes an effective focal length of the wide-angle lens, R31 denotes a radius of curvature of an object-side surface of the third lens, and R32 denotes a radius of curvature of an image-side surface of the third lens. The third lens has proper negative focal power and surface type when satisfying the conditional expressions (3) and (4), effectively corrects aberration caused by the front lens, reduces f-Theta distortion, improves spatial angle resolution and reduces distortion degree of edge images.
In some embodiments, the wide-angle lens satisfies the following conditional expression:
1.7<f4/f<4；（5）
-5<R41/R42<-0.5；（6）
where f4 denotes a focal length of the fourth lens, f denotes an effective focal length of the wide angle lens, 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. The fourth lens has proper positive focal power and surface type when the conditional expressions (5) and (6) are met, so that the convergence of light rays is facilitated, divergent light rays entering the system from the front smoothly enter the rear optical system, the whole light path trend is smoother, the aberration is optimized, and the resolution is improved.
In some embodiments, the wide-angle lens satisfies the following conditional expression:
1<f5/f<5；（7）
-6<R52/f<-1；（8）
where f5 denotes a focal length of the fifth lens, f denotes an effective focal length of the wide-angle lens, and R52 denotes a radius of curvature of an image side surface of the fifth lens. Satisfy conditional expressions (7) and (8), through the focus and the face type of adjustment fifth lens, can slow down the shape change of fifth lens, because the fifth lens sets up behind the diaphragm, the aberration that the preceding lens group of lens of correction that can be better brought improves senior spherical aberration, coma, is favorable to realizing that high resolution, whole resolution are even.
In some embodiments, the wide-angle lens satisfies the following conditional expression:
-4<f6/f<-1；（9）
1<R61/R62<5；（10）
where f6 denotes a focal length of the sixth lens, f denotes an effective focal length of the wide-angle 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. The focal length and the surface type of the sixth lens can be reasonably controlled to be of a meniscus structure, so that the aberration correction of the lens is facilitated, and the imaging quality of the lens is improved.
In some embodiments, the wide-angle lens satisfies the following conditional expression:
1<f7/f<4；（11）
-1.5<R72/f<-0.3；（12）
where f7 denotes a focal length of the seventh lens, f denotes an effective focal length of the wide-angle lens, and R72 denotes a radius of curvature of an image side surface of the seventh lens. The seventh lens has proper positive focal power and surface type when the conditional expressions (11) and (12) are met, so that the imaging area of the lens can be increased, the aberration of the front lens is balanced, and the integral imaging quality of the lens is improved.
In some embodiments, the wide-angle lens satisfies the following conditional expression:
-8<f8/f<-1；（13）
-10<f9/f<-1；（14）
where f8 denotes a focal length of the eighth lens, f9 denotes a focal length of the ninth lens, and f denotes an effective focal length of the wide-angle lens. Satisfy conditional expression (13) and (14), through the focal power of rationally correcting eighth, nine lens, can make the appropriate divergence of light, be favorable to increasing the image area of camera lens, optimize the image quality, promote the holistic power of resolving a picture of camera lens.
In some embodiments, the wide-angle lens satisfies the following conditional expression:
5<DM11/f<14；(15)
where DM11 denotes an effective diameter of an object side surface of the first lens, and f denotes an effective focal length of the wide-angle lens. Satisfy conditional expression (15), the head bore of control camera lens can be better, the angle of incidence of increase light promotes the resolution capability at camera lens edge, also can obtain sufficient imaging quality when guaranteeing wide visual angle, guarantees that the camera lens windowing is great, satisfies the demand at super wide visual angle.
In some embodiments, the wide-angle lens satisfies the following conditional expression:
0.02<BFL/TTL<0.06；（16）
wherein BFL represents the optical back focus of the wide-angle lens, and TTL represents the optical total length of the wide-angle lens. The condition formula (16) is satisfied, and the influence on the imaging quality of the whole lens caused by the interference between the lens and the chip due to insufficient back focus can be avoided.
In some embodiments, the wide-angle lens satisfies the following conditional expression:
1.1mm/rad<f/θ<2mm/rad；（17）
95°<θ<110°；（18）
wherein f represents an effective focal length of the wide-angle lens, and θ represents a maximum half field angle, unit rad, of the wide-angle lens. When the conditional expressions (17) and (18) are satisfied, the wide-angle lens has a larger field angle, a larger imaging field range can be obtained, and the lens also has a shorter focal length, so that the depth of field of the lens is larger, and both front and rear scenes of a shot subject can be clearly reproduced on a picture.
In some embodiments, the wide-angle lens satisfies the following conditional expression:
1.5<DM11/R11+DM12/R12<4；（19）
wherein DM11 represents an effective diameter of an object-side surface of the first lens, DM12 represents an effective diameter of an image-side surface of the first lens, R11 represents a radius of curvature of the object-side surface of the first lens, and R12 represents a radius of curvature of the image-side surface of the first lens. The first lens meets the conditional expression (19), the spherical curvature of the first lens can be reasonably limited, the first lens is beneficial to molding, and the centering difficulty during processing is reduced.
In some embodiments, the second lens element, the third lens element, the fifth lens element, the sixth lens element, the seventh lens element, the eighth lens element and the ninth lens element are all plastic aspheric lens elements, and aspheric lens elements are adopted, so that the lens has better imaging quality, the structure of the lens is more compact, and the size of the lens is effectively reduced. In addition, in some embodiments, the first lens element, the second lens element, the third lens element, the fourth lens element, the fifth lens element, the sixth lens element, the seventh lens element, the eighth lens element and the ninth lens element may be all glass lens elements, or a combination of plastic lens elements and glass lens elements, which can achieve the imaging effect of large wide angle and high pixels of the wide-angle lens.
The invention is further illustrated below in the following examples. In various embodiments, the thickness, the curvature radius, and the material selection of each lens in the wide-angle 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 only by the following examples, and any other changes, substitutions, combinations or simplifications which do not depart from the innovative points of the present invention should be construed as being equivalent substitutions and shall be included within the scope of the present invention.
In the embodiments of the present invention, when the lens in the wide-angle lens is an aspherical lens, the aspherical surface type 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 radius 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 a wide-angle lens 100 according to a first embodiment of the present invention is shown, where the wide-angle lens 100 includes, from an object side to an image plane S21 along an optical axis: a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a stop ST, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, a ninth lens L9, and a filter G1; the first lens L1 and the fourth lens L4 are glass spherical lenses, and the rest of the lenses are plastic aspheric lenses.
The first lens L1 has negative focal power, the object side surface S1 of the first lens is a convex surface, and the image side surface S2 of the first lens is a concave surface;
the second lens L2 has negative optical power, the object-side surface S3 of the second lens is concave at the paraxial region, and the image-side surface S4 of the second lens is concave;
the third lens element L3 has negative power, the object-side surface S5 of the third lens element is concave, and the image-side surface S6 of the third lens element is convex at paraxial region;
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 positive focal power, the object-side surface S9 of the fifth lens is a convex surface, and the image-side surface S10 of the fifth lens is a convex surface;
the sixth lens element L6 has negative refractive power, and the object-side surface S11 and the image-side surface S12 of the sixth lens element are convex and concave, respectively;
the seventh lens element L7 has positive refractive power, and the object-side surface S13 and the image-side surface S14 of the seventh lens element are convex, respectively;
the eighth lens element L8 has a negative optical power, the object-side surface S15 of the eighth lens element is concave, and the image-side surface S16 of the eighth lens element is concave at the paraxial region;
the ninth lens L9 has negative optical power, and an object-side surface S17 of the ninth lens is concave at the paraxial region, and an image-side surface S18 of the ninth lens is concave at the paraxial region;
the object-side surface of the filter G1 is S19, and the image-side surface is S20.
The parameters related to each lens in the wide-angle lens 100 provided in this embodiment are shown in table 1.
TABLE 1
Please refer to table 2, which shows the surface shape coefficients of the aspheric surfaces of the wide-angle lens 100 according to the first embodiment of the present invention.
TABLE 2
Fig. 2, 3 and 4 are graphs of curvature of field, axial chromatic aberration and vertical chromatic aberration of the wide-angle lens 100 in the first embodiment, 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 ± 0.02mm, which indicates that the field curvature correction of the wide-angle lens 100 is good.
The axial chromatic aberration curve of fig. 3 represents the aberration on the optical axis on the imaging plane. In FIG. 3, the horizontal axis represents a sphere value (unit: mm) and the vertical axis represents a normalized pupil radius. As can be seen from fig. 3, the shift amount of the axial chromatic aberration is controlled within ± 0.01mm, which shows that the wide-angle lens 100 can effectively correct the aberration of the fringe field and the secondary spectrum of the entire image plane.
The vertical axis chromatic aberration curve of fig. 4 shows chromatic aberration at different image heights on the image forming surface for the longest wavelength and the shortest wavelength. In fig. 4, 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. 4, the vertical chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ± 1 μm, which indicates that the vertical chromatic aberration of the wide-angle lens 100 is well corrected.
Second embodiment
Referring to fig. 5, a schematic structural diagram of a wide-angle lens 200 according to a second embodiment of the present invention is shown, in which the wide-angle lens 200 in this embodiment is substantially the same as the wide-angle lens 100 in the first embodiment, except that an object-side surface S17 of the ninth lens element is a convex surface at a paraxial region, and curvature radii, materials, thicknesses, and the like of the respective lens elements are different, and specific parameters of the respective lens elements are shown in table 3.
TABLE 3
Referring to table 4, the surface coefficients of the aspheric surfaces of the wide-angle lens 200 according to the second embodiment of the present invention are shown.
TABLE 4
Fig. 6, 7 and 8 are graphs of field curvature, axial chromatic aberration and vertical chromatic aberration, respectively, of the wide-angle lens 200 in the second embodiment.
As can be seen from fig. 6, the field curvature of the meridional image plane and the sagittal image plane is controlled within ± 0.06mm, which indicates that the field curvature correction of the wide-angle lens 200 is good.
As can be seen from fig. 7, the shift amount of the axial chromatic aberration is controlled within ± 0.02mm, which shows that the wide-angle lens 200 can effectively correct the aberration of the fringe field and the secondary spectrum of the entire image plane.
As can be seen from fig. 8, the vertical chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ± 2 μm, which indicates that the vertical chromatic aberration of the wide-angle lens 200 is well corrected.
Third embodiment
Referring to fig. 9, a schematic structural diagram of a wide-angle lens 300 according to a third embodiment of the present invention is shown, in which the wide-angle lens 300 in this embodiment is substantially the same as the wide-angle lens 100 in the first embodiment, except that an object-side surface S13 of the seventh lens element is concave at a paraxial region, an image-side surface S16 of the eighth lens element is convex, an object-side surface S17 of the ninth lens element is convex at a paraxial region, and curvature radii, materials, thicknesses, and the like of the respective lens elements are different, and specific parameters related to the respective lens elements are shown in table 5.
TABLE 5
Referring to table 6, the surface coefficients of the aspheric surfaces of the wide-angle lens 300 according to the third embodiment of the present invention are shown.
TABLE 6
Fig. 10, 11 and 12 are graphs of curvature of field, axial chromatic aberration and vertical chromatic aberration, respectively, of the wide-angle lens 300 in the third embodiment.
As can be seen from fig. 10, the field curvature of the meridional image plane and the sagittal image plane is controlled within ± 0.03mm, which indicates that the field curvature correction of the wide-angle lens 300 is good.
As can be seen from fig. 11, the shift amount of axial chromatic aberration is controlled within ± 0.02mm, which indicates that the wide-angle lens 300 can effectively correct the aberration of the fringe field and the secondary spectrum of the entire image plane.
As can be seen from fig. 12, the vertical chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ± 2 μm, which indicates that the vertical chromatic aberration of the wide-angle lens 300 is well corrected.
Fourth embodiment
Referring to fig. 13, a schematic structural diagram of a wide-angle lens 400 according to a fourth embodiment of the present invention is shown, in which the wide-angle lens 400 in this embodiment is substantially the same as the wide-angle lens 100 in the first embodiment, except that an image-side surface S16 of the eighth lens element is a convex surface, and curvature radii, materials, thicknesses, and the like of the respective lens elements are different, and specific parameters of the respective lens elements are shown in table 7.
TABLE 7
Referring to fig. 8, the surface coefficients of the aspheric surfaces of the wide-angle lens 400 according to the fourth embodiment of the present invention are shown.
TABLE 8
Fig. 14, 15 and 16 are graphs of field curvature, axial chromatic aberration and vertical chromatic aberration, respectively, of the wide-angle lens 400 in the fourth embodiment.
As can be seen from fig. 14, the field curvature of the meridional image plane and the sagittal image plane is controlled within ± 0.02mm, which indicates that the field curvature correction of the wide-angle lens 400 is good.
As can be seen from fig. 15, the shift amount of axial chromatic aberration is controlled within ± 0.02mm, which indicates that the wide-angle lens 400 can effectively correct the aberration of the fringe field and the secondary spectrum of the entire image plane.
As can be seen from fig. 16, the vertical chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ± 2 μm, which indicates that the vertical chromatic aberration of the wide-angle lens 400 is well corrected.
Table 9 shows the optical characteristics corresponding to the four embodiments, which mainly includes the effective focal length F, F #, the maximum field angle 2 θ, the total optical length TTL, the image height IH corresponding to the maximum half field of view, and the values corresponding to each conditional expression.
TABLE 9
In summary, the wide-angle lens provided by the embodiments of the present invention has at least the following advantages:
(1) The wide-angle lens provided by the invention adopts nine glass-plastic mixed lenses for matching, and through specific focal power combination and surface type matching, the lens not only has smaller volume and weight, but also has better thermal stability, and can realize high-definition imaging of the lens in high and low temperature environments.
(2) The wide-angle lens provided by the invention has the advantages that through the combination of the spherical lens and the non-spherical lens, the lens has an ultra-large field angle, pictures in a larger range can be shot, a large-size sensor chip can be better matched, the photosensitive area of the wide-angle lens is increased, and diversified use requirements can be well met.
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 examples are merely illustrative of several embodiments of the present invention, and the description thereof is more specific and detailed, but not to be construed as limiting the scope of the 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. A wide-angle lens, comprising, in order from an object side to an imaging surface along an optical axis:
the lens comprises a first lens with negative focal power, a second lens and a third lens, 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 a negative optical power, an object-side surface of the second lens being concave at a paraxial region, an image-side surface of the second lens being concave;
a third lens element having a negative optical power, the third lens element having a concave object-side surface and a convex image-side surface at a paraxial region;
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;
a diaphragm;
the lens comprises a fifth lens with positive focal power, wherein the object side surface of the fifth lens is a convex surface, and the image side surface of the fifth lens is a convex surface;
the sixth lens with negative focal power is characterized in that the object side surface of the sixth lens is a convex surface, and the image side surface of the sixth lens is a concave surface;
the seventh lens with positive focal power, wherein the image side surface of the seventh lens is a convex surface;
an eighth lens having a negative optical power, an object side surface of the eighth lens being a concave surface;
a ninth lens having a negative optical power, an image-side surface of the ninth lens being concave at a paraxial region;
the wide-angle lens comprises at least one glass lens and one plastic lens;
the wide-angle lens meets the following conditional expression:
-5<f2/f<-1；
-6<R21/R22<-1；
where f2 denotes a focal length of the second lens, f denotes an effective focal length of the wide-angle lens, 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.
2. The wide-angle lens of claim 1, wherein the wide-angle lens satisfies the following conditional expression:
-0.2<f/f3<0；
0.1<R31/R32<1；
where f3 denotes a focal length of the third lens, f denotes an effective focal length of the wide-angle lens, R31 denotes a radius of curvature of an object-side surface of the third lens, and R32 denotes a radius of curvature of an image-side surface of the third lens.
3. The wide-angle lens of claim 1, wherein the wide-angle lens satisfies the following conditional expression:
1.7<f4/f<4；
-5<R41/R42<-0.5；
where f4 denotes a focal length of the fourth lens, f denotes an effective focal length of the wide-angle lens, 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.
4. The wide-angle lens of claim 1, wherein the wide-angle lens satisfies the following conditional expression:
1<f5/f<5；
-6<R52/f<-1；
where f5 denotes a focal length of the fifth lens, f denotes an effective focal length of the wide-angle lens, and R52 denotes a radius of curvature of an image side surface of the fifth lens.
5. The wide-angle lens of claim 1, wherein the wide-angle lens satisfies the following conditional expression:
-4<f6/f<-1；
1<R61/R62<5；
where f6 denotes a focal length of the sixth lens, f denotes an effective focal length of the wide-angle 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.
6. The wide-angle lens of claim 1, wherein the wide-angle lens satisfies the following conditional expression:
1<f7/f<4；
-1.5<R72/f<-0.3；
where f7 denotes a focal length of the seventh lens, f denotes an effective focal length of the wide-angle lens, and R72 denotes a radius of curvature of an image side surface of the seventh lens.
7. The wide-angle lens of claim 1, wherein the wide-angle lens satisfies the following conditional expression:
-8<f8/f<-1；
-10<f9/f<-1；
where f8 denotes a focal length of the eighth lens, f9 denotes a focal length of the ninth lens, and f denotes an effective focal length of the wide angle lens.
8. The wide-angle lens of claim 1, wherein the wide-angle lens satisfies the following conditional expression:
5<DM11/f<14；
where DM11 denotes an effective diameter of an object side surface of the first lens, and f denotes an effective focal length of the wide-angle lens.
9. The wide-angle lens of claim 1, wherein the wide-angle lens satisfies the following conditional expression:
0.02<BFL/TTL<0.06；
wherein BFL represents the optical back focus of the wide-angle lens, and TTL represents the optical total length of the wide-angle lens.
10. The wide-angle lens of claim 1, wherein the wide-angle lens satisfies the following conditional expression:
1.1mm/rad<f/θ<2mm/rad；
95°<θ<110°；
where f denotes an effective focal length of the wide-angle lens, and θ denotes a maximum half field angle of the wide-angle lens.
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| CN215813674U (en) * | 2021-07-09 | 2022-02-11 | 捷西迪（广州）光学科技有限公司 | Imaging lens |
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| CN112099205A (en) * | 2020-11-16 | 2020-12-18 | 江西联创电子有限公司 | Wide-angle lens |
| CN215813674U (en) * | 2021-07-09 | 2022-02-11 | 捷西迪（广州）光学科技有限公司 | Imaging lens |
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