CN111650731A - Wide-angle lens and imaging apparatus - Google Patents
Wide-angle lens and imaging apparatus Download PDFInfo
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- CN111650731A CN111650731A CN202010792830.8A CN202010792830A CN111650731A CN 111650731 A CN111650731 A CN 111650731A CN 202010792830 A CN202010792830 A CN 202010792830A CN 111650731 A CN111650731 A CN 111650731A
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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
- G02B13/001—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 provides a wide-angle lens, which consists of a first lens, a second lens, a third lens, a diaphragm, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an optical filter in sequence from an object side to an imaging surface; the first lens satisfies the following conditional expression: 1.5 < r1/r2＜2.5；‑2＜f1/f＜‑1；0＜ωD/ωmax＜0.6；2＜LD/Lmax＜3；r1、r2Denotes the radii of curvature of the object-side and image-side surfaces of the first lens, respectively, f1Denotes a focal length of the first lens, f denotes a focal length of the wide-angle lens, ωDDenotes a plane tilt angle, ω, at an object-side edge aperture of the first lensmaxDenotes the maximum surface tilt angle L in the full aperture of the object-side surface of the first lensDDenotes a radial length, L, of a position where a face tilt angle at an object side face edge aperture of the first lens is locatedmaxRepresenting the largest surface of the full aperture of the object-side surface of the first lensThe radial length of the position of the inclination angle. The wide-angle lens provided by the invention has the advantages of small volume, high pixel and clearer imaging of a distant view object. The invention also provides an imaging device.
Description
Technical Field
The invention relates to the technical field of lens imaging, in particular to a wide-angle lens and imaging equipment.
Background
In the fields of vehicle-mounted and monitoring, wide-angle lenses are widely applied. However, the common wide-angle lens has the defects that the object details cannot be distinguished in the long shot, the lens pixels are low, the lens volume is large, and the like.
With the development of vehicle-mounted lenses and monitoring lenses, the requirement for wide-angle lenses is increasing day by day, and the above disadvantages are urgently needed to be improved.
Disclosure of Invention
Based on this, the present invention provides a wide-angle lens and an imaging device with small volume, high pixel and clearer imaging of a distant view object, which can resolve the distant view object and improve the resolution of the lens.
The embodiment of the invention achieves the aim through the following technical scheme.
In a first aspect, the present invention provides a wide-angle lens, which comprises, in order from an object side to an image plane, a first lens, a second lens, a third lens, a diaphragm, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an optical filter; the first lens has negative focal power, and the object side surface and the image side surface of the first lens are convex and concave; the object side surface of the second lens is a concave surface, and the image side surface of the second lens is a convex surface; the third lens has positive focal power, the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a concave surface or 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 concave surface or a convex surface; the fifth lens has positive focal power, and both the object side surface and the image side surface of the fifth lens are convex surfaces; the sixth lens has negative focal power, the object side surface of the sixth lens is a concave surface, and the fifth lens and the sixth lens form a bonding body; the object-side surface of the seventh lens element is convex at a paraxial region thereof, the image-side surface of the seventh lens element is concave at a paraxial region thereof, and at least one inflection point is formed on the object-side surface and the image-side surface of the seventh lens element; the first lens satisfies the following conditional expression: 1.5 < r1/r2＜2.5；-2＜f1/f＜-1；0＜ωD/ωmax＜0.6；2＜LD/LmaxLess than 3; wherein r is1Denotes the radius of curvature of the object-side surface of the first lens, r2Denotes the radius of curvature of the image-side surface of the first lens, f1Denotes a focal length of the first lens, f denotes a focal length of the wide-angle lens, ωDDenotes a plane tilt angle, ω, at an object-side edge aperture of the first lensmaxRepresenting the object side of the first lensMaximum face inclination in full aperture, LDDenotes a radial length, L, of a position where a face tilt angle at an object side face edge aperture of the first lens is locatedmaxThe radial length of the position where the maximum face tilt angle is located in the full aperture of the object side surface of the first lens is expressed.
In a second aspect, an embodiment of the present invention further provides an imaging apparatus, which includes an imaging element and the wide-angle lens provided in the first aspect, wherein the imaging element is configured to convert an optical image formed by the wide-angle lens into an electrical signal.
Compared with the prior art, the first lens adopts a special aspheric surface type arrangement, namely, the surface inclination angle of the object side surface of the first lens meets the gradual change trend of increasing and then reducing from the center of the lens to the edge of the lens, the first lens with the characteristics can effectively increase the number of pixel points in the image center area of the wide-angle lens, so that the wide-angle lens can accommodate more pixel points under the condition of the same field angle, and meanwhile, the equivalent focal length of the center area of the wide-angle lens is longer, thereby realizing the effect of imaging a distant view object more clearly; the second lens is a meniscus aspheric lens with the concave surface facing the object side and is mainly used for correcting distortion and curvature of field; the third lens and the fourth lens are both lenses with positive focal power, and the third lens and the fourth lens are distributed on two sides of the diaphragm, so that the spherical aberration of the wide-angle lens can be effectively corrected, the focal power can be effectively shared, and the tolerance sensitivity of the third lens and the fourth lens is reduced; meanwhile, the diaphragm is arranged between the third lens and the fourth lens, so that the distance from the diaphragm to the vertex of the object side surface of the first lens is close to the distance from the diaphragm to the vertex of the image side surface of the seventh lens, and compared with other optical lenses, the wide-angle lens can ensure that the front end aperture and the rear end aperture are smaller, and the size of the lens is effectively reduced; the seventh lens is an aspheric lens with the retroflection characteristic, and compared with an ordinary aspheric lens without the retroflection characteristic, the seventh lens can better eliminate aberration and control the emergent angle of a chief ray, effectively improves the resolving power of the wide-angle lens, and enables the wide-angle lens to have higher pixels.
Drawings
Fig. 1 is a schematic structural diagram of a first lens of a wide-angle lens provided in an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a wide-angle lens according to a first embodiment of the present invention;
FIG. 3 is a diagram showing distortion of a wide-angle lens according to a first embodiment of the present invention;
FIG. 4 is a diagram of axial chromatic aberration of a wide-angle lens according to a first embodiment of the present invention;
FIG. 5 is a schematic structural diagram of a wide-angle lens according to a second embodiment of the present invention;
FIG. 6 is a diagram showing distortion of a wide-angle lens in a second embodiment of the present invention;
FIG. 7 is a diagram of axial chromatic aberration of a wide-angle lens according to a second embodiment of the present invention;
FIG. 8 is a schematic structural diagram of a wide-angle lens according to a third embodiment of the present invention;
FIG. 9 is a diagram showing distortion of a wide-angle lens in a third embodiment of the present invention;
FIG. 10 is a diagram showing axial chromatic aberration of a wide-angle lens according to a third embodiment of the present invention;
FIG. 11 is a schematic structural diagram of a wide-angle lens according to a fourth embodiment of the present invention;
FIG. 12 is a diagram showing distortion of a wide-angle lens in a fourth embodiment of the present invention;
FIG. 13 is a diagram showing axial chromatic aberration of a wide-angle lens according to a fourth embodiment of the present invention;
fig. 14 is a schematic structural diagram of a wide-angle lens in a fifth embodiment of the present invention;
FIG. 15 is a diagram showing distortion of a wide-angle lens in a fifth embodiment of the present invention;
FIG. 16 is a diagram showing axial chromatic aberration of a wide-angle lens according to a fifth embodiment of the present invention;
fig. 17 is a schematic structural diagram of a wide-angle lens in a sixth embodiment of the present invention;
fig. 18 is a distortion diagram of a wide-angle lens in a sixth embodiment of the present invention;
FIG. 19 is a diagram showing axial chromatic aberration of a wide-angle lens in a sixth embodiment of the present invention;
fig. 20 is a schematic structural view of a wide-angle lens in a seventh embodiment of the present invention;
FIG. 21 is a diagram showing distortion of a wide-angle lens in a seventh embodiment of the present invention;
FIG. 22 is a diagram showing axial chromatic aberration of a wide-angle lens in a seventh embodiment of the present invention;
fig. 23 is a schematic structural view of an image forming apparatus in an eighth embodiment of the present invention;
description of the main element symbols:
the following detailed description will further illustrate the invention in conjunction with the above-described figures.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. 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. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
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 diaphragm, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an optical filter.
The first lens has negative focal power, and the object side surface and the image side surface of the first lens are convex and concave;
the object side surface of the second lens is a concave surface, and the image side surface of the second lens is a convex surface;
the third lens has positive focal power, the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a concave surface or 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 concave surface or a convex surface;
the fifth lens has positive focal power, and both the object side surface and the image side surface of the fifth lens are convex surfaces;
the sixth lens has negative focal power, the object side surface of the sixth lens is a concave surface, and the fifth lens and the sixth lens form a bonding body;
the object-side surface of the seventh lens element is convex at a paraxial region thereof, the image-side surface of the seventh lens element is concave at a paraxial region thereof, and at least one inflection point is located on both the object-side surface and the image-side surface of the seventh lens element.
In some embodiments, the first lens satisfies the following conditional expression:
1.5＜r1/r2＜2.5； （1）
-2＜f1/f＜-1； （2）
0＜ωD/ωmax＜0.6； （3）
2＜LD/Lmax＜3； （4）
wherein r is1Denotes the radius of curvature of the object-side surface of the first lens, r2Denotes the radius of curvature of the image-side surface of the first lens, f1Denotes a focal length of the first lens, f denotes a focal length of the wide-angle lens, ωDDenotes a plane tilt angle, ω, at an object-side edge aperture of the first lensmaxDenotes the maximum surface tilt angle L in the full aperture of the object-side surface of the first lensDDenotes a radial length, L, of a position where a face tilt angle at an object side face edge aperture of the first lens is locatedmaxThe radial length of the position of the maximum surface inclination angle in the full aperture of the object side surface of the first lens is shown, the schematic diagram of the above parameters is shown in detail in fig. 1, and i represents any position of the object side surface.
The first lens with the characteristics can effectively increase the number of pixel points in the picture center area of the wide-angle lens, enable the wide-angle lens to contain more pixel points under the condition that the field angle is the same, enable the equivalent focal length of the center area of the wide-angle lens to be longer, further achieve the result that a distant view object is imaged more clearly, and effectively improve the resolving power of the wide-angle lens.
In some embodiments, the object side surface and the image side surface of the seventh lens each have at least one inflection point, and the seventh lens satisfies the conditional expression:
0.3＜r12/r13＜1.6； （5）
0.8＜CT7/ET7＜1.6； （6）
wherein r is12Denotes a radius of curvature, r, of an object side surface of the seventh lens13Denotes the radius of curvature of the image-side surface of the seventh lens, CT7Denotes the center thickness, ET, of the seventh lens7The thickness of the lens at the edge aperture of the seventh lens is shown.
Satisfying above-mentioned conditional expressions (5) and (6), enabling the seventh lens to have better correction aberration and the effect of the exit angle of control chief ray, effectively reducing the aberration of marginal ray such as coma, astigmatism, field curvature etc. effectively improves wide-angle lens's resolving power, makes wide-angle lens satisfy higher pixel requirement.
In some embodiments, the wide-angle lens satisfies the following conditional expression:
1＜f3/f4+r5/r7＜2.3； （7）
wherein f is3Denotes the focal length of the third lens, f4Denotes the focal length of the fourth lens, r5Denotes the radius of curvature of the object-side surface of the third lens, r7The radius of curvature of the object side of the fourth lens is shown.
Because the third lens and the fourth lens are distributed on two sides of the diaphragm and are both positive focal power lenses, the condition (7) is satisfied, tolerance sensitivity of the third lens and the fourth lens can be effectively reduced, assembly yield of the lens is improved, and production cost is reduced.
In some embodiments, the wide-angle lens satisfies the following conditional expression:
0.9＜L1S/LS7＜1.2； （8）
0.5＜f4/r7＜2.2； （9）
wherein L is1SDenotes the vertical distance, L, from the apex of the object-side surface of the first lens to the diaphragmS7Denotes the vertical distance, f, of the stop from the apex of the image-side surface of the seventh lens4Denotes the focal length of the fourth lens, r7The radius of curvature of the object side of the fourth lens is shown.
The distance between the diaphragm and the object side vertex of the first lens and the distance between the diaphragm and the image side vertex of the seventh lens are close to each other when the conditional expressions (8) and (9) are met, the front end aperture and the rear end aperture of the wide-angle lens can be simultaneously reduced, and compared with the larger front end aperture (caused by the larger first lens) or the larger rear end aperture (caused by the diaphragm being too far forward) of other wide-angle lenses, the wide-angle lens has smaller integral volume.
In some embodiments, in order to ensure that the wide-angle lens has a characteristic of a large aperture, the wide-angle lens satisfies the following conditional expression:
1.3＜Dmax/DST＜2； （10）
2.5＜L/DST＜3.5； （11）
wherein D ismaxDenotes the radial length of the first lens, DSTDenotes the radial length of the stop, and L denotes the vertical distance from the vertex of the object-side surface of the first lens to the vertex of the image-side surface of the seventh lens.
Satisfying the above conditional expressions (10) and (11), the wide-angle lens can have a characteristic of large aperture, the amount of light entering the lens is large, and the imaging requirement in the environment of light and shade change can be satisfied.
In some embodiments, in order to effectively correct curvature of field and distortion of the wide-angle lens, the second lens satisfies the following conditional expressions:
0.3＜r3/r4＜1.5； （12）
-0.2＜CT2/f2＜0.2； （13）
wherein r is3Denotes the radius of curvature of the object-side surface of the second lens, r4Representing the radius of curvature of the image-side surface of the second lens, CT2Denotes the center thickness, f, of the second lens2Indicating the focal length of the second lens.
In some embodiments, the wide-angle lens satisfies the following conditional expression:
0.2＜CT1/ CT2＜0.6； （14）
-10＜r3/r2＜-4； （15）
wherein r is2Denotes the radius of curvature of the image-side surface of the first lens, r3Denotes the radius of curvature of the object-side surface of the second lens, CT1Denotes the center thickness, CT, of the first lens2The center thickness of the second lens is indicated.
Satisfying the conditional expressions (14) and (15), the first lens and the second lens can be better matched to correct the light path, the emergent light of the image side surface of the second lens is approximately parallel to the optical axis, and the subsequent lens can correct the light phase difference conveniently; meanwhile, ghost images formed by reflection of light rays between the object side face of the second lens and the image side face of the first lens can be effectively eliminated, the ghost images are prevented from appearing in the shot images, and the imaging quality of the shot images by the lens is effectively improved.
In some embodiments, the wide-angle lens has an F # of < 1.6. The lower the f-number of the wide-angle lens is, the larger the aperture is, the stronger the light collection capability is, and the imaging requirement under the environment with light and shade change can be met.
In some embodiments, the first lens, the second lens and the seventh lens may all be glass aspheric lenses, and the third lens, the fourth lens, the fifth lens and the sixth lens may all be glass spherical lenses.
The wide-angle lens has the advantages of effectively increasing the focal length of the lens, improving the imaging effect of the central area of an imaging picture and further improving the imaging capability of a distant view object.
The aspheric surface shape of the wide-angle lens in various embodiments of the present invention satisfies the following equation:
wherein z represents the distance in the optical axis direction from the curved surface vertex, c represents the curvature of the curved surface vertex, K represents the conic coefficient, h represents the distance from the optical axis to the curved surface, and B, C, D, E and F represent the fourth, sixth, eighth, tenth and twelfth order curved surface coefficients, respectively.
In the following embodiments, the thickness, the radius of curvature, and the material selection of each lens in the wide-angle lens are different, and specific differences can be referred to in the parameter tables of the embodiments.
First embodiment
Referring to fig. 2, a wide-angle lens 100 according to a first embodiment of the present invention sequentially includes, from an object side to an image plane S16: the lens comprises a first lens L1, a second lens L2, a third lens L3, a diaphragm ST, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7 and a filter G1.
The first lens L1 has negative refractive power, the object-side surface S1 of the first lens is convex, the image-side surface S2 of the first lens is concave, and the first lens L1 is a glass aspheric lens.
The second lens L2 has positive refractive power, the object-side surface S3 of the second lens is concave, the image-side surface S4 of the second lens is convex, and the second lens L2 is a glass aspheric lens.
The third lens L3 has positive refractive power, the object-side surface S5 of the third lens is convex, the image-side surface S6 of the third lens is concave, and the third lens L3 is a glass spherical lens.
The fourth lens L4 has positive power, and both the object-side surface S7 and the image-side surface S8 of the fourth lens are convex, and the fourth lens L4 is a glass spherical lens.
The fifth lens L5 has positive optical power, and both the object-side surface S9 of the fifth lens and the cemented surface S10 of the fifth lens and the sixth lens (i.e., the image-side surface of the fifth lens) are convex.
The sixth lens L6 has negative power, the cemented surface S10 of the fifth lens and the sixth lens (i.e., the object-side surface of the sixth lens) is a concave surface, the image-side surface S11 of the sixth lens is a convex surface, and the fifth lens L5 and the sixth lens L6 are cemented into a cemented body and are both glass spherical lenses.
The seventh lens L7 has negative power, the central region of the object-side surface S12 of the seventh lens is convex, the central region of the image-side surface S13 of the seventh lens is concave, and both the object-side surface S12 of the seventh lens and the image-side surface S13 of the seventh lens have at least one inflection point, and the seventh lens L7 is a glass aspheric lens.
The stop ST is provided between the third lens L3 and the fourth lens L4, and the filter G1 is provided between the seventh lens L7 and the image forming surface S16. The parameters associated with each lens of wide-angle lens 100 provided in the first embodiment of the present invention are shown in table 1-1.
TABLE 1-1
The aspherical parameters of each lens of this example are shown in tables 1 to 2.
Tables 1 to 2
In the present embodiment, the distortion and the axial chromatic aberration are shown in fig. 3 and 4, respectively. Fig. 3 shows that distortion of the wide-angle lens 100 of the present embodiment is substantially zero within a half field angle of 20 °, which indicates that a picture of the wide-angle lens 100 within the half field angle of 20 ° can accommodate more pixel numbers, and can effectively improve the imaging capability of the wide-angle lens 100 to a distant view within the half field angle of 20 °, and fig. 4 shows that a single wavelength of axial chromatic aberration of the wide-angle lens 100 of the present embodiment is not more than 0.05mm at most, an axial chromatic aberration difference between two different wavelengths is not more than 0.04mm, and axial chromatic aberration at a pupil edge position is well corrected.
Second embodiment
Fig. 5 is a schematic structural diagram of a wide-angle lens 200 according to the present embodiment. The wide-angle lens 200 in this embodiment is substantially the same as the wide-angle lens 100 in the first embodiment, except that the second lens L2 of the wide-angle lens 200 in this embodiment is a negative power lens, the image-side surface S6 of the third lens is a convex surface, the image-side surface S8 of the fourth lens is a concave surface, the seventh lens L7 is a positive power lens, and the curvature radius and material selection of each lens are different, and specific relevant parameters of each lens are shown in table 2-1.
TABLE 2-1
The aspherical surface parameters of each lens of this example are shown in Table 2-2.
Tables 2 to 2
In the present embodiment, the distortion and the axial chromatic aberration are shown in fig. 6 and 7, respectively. Fig. 6 shows that distortion of the wide-angle lens 200 of the present embodiment is substantially zero within a half field angle of 20 °, which indicates that a picture of the wide-angle lens 200 within the half field angle of 20 ° can accommodate more pixel numbers, and the imaging capability of the wide-angle lens 200 on a long-distance view within the half field angle of 20 ° can be effectively improved. As can be seen from fig. 7, the single wavelength of the axial chromatic aberration of the wide-angle lens 200 of the present embodiment is not more than 0.03mm at most, the difference in the axial chromatic aberration between two different wavelengths is not more than 0.03mm, and the axial chromatic aberration at the pupil edge position is well corrected.
Third embodiment
Fig. 8 is a schematic structural diagram of a wide-angle lens 300 according to the present embodiment. The wide-angle lens 300 in this embodiment is substantially the same as the wide-angle lens 100 in the first embodiment, except that the second lens L2 of the wide-angle lens 300 in this embodiment is a negative power lens, the image-side surface S6 of the third lens is a convex surface, the image-side surface S8 of the fourth lens is a concave surface, the seventh lens L7 is a positive power lens, and the curvature radius and material selection of each lens are different, and specific relevant parameters of each lens are shown in table 3-1.
TABLE 3-1
The aspherical surface parameters of each lens of this example are shown in Table 3-2.
TABLE 3-2
In the present embodiment, the distortion and the axial chromatic aberration are shown in fig. 9 and 10, respectively. Fig. 9 shows that distortion of the wide-angle lens 300 of the present embodiment is substantially zero within a half field angle of 20 °, which indicates that a picture of the wide-angle lens 300 within the half field angle of 20 ° can accommodate more pixel numbers, and the imaging capability of the wide-angle lens 300 on a long-distance view within the half field angle of 20 ° can be effectively improved. As can be seen from fig. 10, the single wavelength of the axial chromatic aberration of the wide-angle lens 300 of the present embodiment is not more than 0.03mm at most, the difference in the axial chromatic aberration between two different wavelengths is not more than 0.03mm, and the axial chromatic aberration at the pupil edge position is well corrected.
Fourth embodiment
Fig. 11 is a schematic structural diagram of a wide-angle lens 400 according to the present embodiment. The wide-angle lens 400 in this embodiment is substantially the same as the wide-angle lens 100 in the first embodiment, except that the second lens L2 of the wide-angle lens 400 in this embodiment is a negative power lens, the seventh lens L7 is a positive power lens, and the curvature radius and material selection of each lens are different, and specific relevant parameters of each lens are shown in table 4-1.
TABLE 4-1
The aspherical surface parameters of each lens of this example are shown in Table 4-2.
TABLE 4-2
In the present embodiment, the distortion and the axial chromatic aberration are shown in fig. 12 and 13, respectively. Fig. 12 shows that distortion of the wide-angle lens 400 of the present embodiment is substantially zero within a half field angle of 22 °, which indicates that a picture of the wide-angle lens 400 within the half field angle of 22 ° can accommodate more pixel numbers, and the imaging capability of the wide-angle lens 400 on a long-distance view within the half field angle of 22 ° can be effectively improved. As can be seen from fig. 13, the single wavelength of the axial chromatic aberration of the wide-angle lens 400 of the present embodiment does not exceed 0.025mm at maximum, the difference between two different wavelengths does not exceed 0.04mm, and the axial chromatic aberration at the pupil edge position is well corrected.
Fifth embodiment
Fig. 14 is a schematic structural diagram of a wide-angle lens 500 according to the present embodiment. The wide-angle lens 500 in the present embodiment is substantially the same as the wide-angle lens 100 in the first embodiment, except that the image-side surface S6 of the third lens of the wide-angle lens 500 in the present embodiment is a convex surface, and the curvature radius and material selection of each lens are different, and specific relevant parameters of each lens are shown in table 5-1.
TABLE 5-1
The aspherical surface parameters of each lens of this example are shown in Table 5-2.
TABLE 5-2
In the present embodiment, the distortion and the axial chromatic aberration are shown in fig. 15 and 16, respectively. Fig. 15 shows that distortion of the wide-angle lens 500 of the present embodiment is substantially zero within a half field angle of 17 °, which indicates that a picture of the wide-angle lens 500 within the half field angle of 17 ° can accommodate more pixel numbers, and the imaging capability of the wide-angle lens 500 on a long-distance view within the half field angle of 17 ° can be effectively improved. As can be seen from fig. 16, the single wavelength of the axial chromatic aberration of the wide-angle lens 500 of the present embodiment is not more than 0.05mm at most, and the difference between two different wavelengths is not more than 0.03 mm.
Sixth embodiment
Fig. 17 is a schematic structural diagram of a wide-angle lens 600 according to the present embodiment. The wide-angle lens 600 in this embodiment is substantially the same as the wide-angle lens 100 in the first embodiment, except that the image-side surface S6 of the third lens of the wide-angle lens 600 in this embodiment is a convex surface, and the curvature radius and material selection of each lens are different, and specific relevant parameters of each lens are shown in table 6-1.
TABLE 6-1
The aspherical surface parameters of each lens of this example are shown in Table 6-2.
TABLE 6-2
In the present embodiment, the distortion and the axial chromatic aberration are shown in fig. 18 and 19, respectively. Fig. 18 shows that distortion of the wide-angle lens 600 of the present embodiment is substantially zero within a half field angle of 25 °, which indicates that a picture of the wide-angle lens 600 within the half field angle of 25 ° can accommodate more pixel numbers, and the imaging capability of the wide-angle lens 600 on a long-distance view within the half field angle of 25 ° can be effectively improved. As can be seen from fig. 19, the single wavelength of the axial chromatic aberration of the wide-angle lens 600 of the present embodiment does not exceed 0.032mm at maximum, the difference between two different wavelengths does not exceed 0.035mm, and the axial chromatic aberration at the pupil edge position is well corrected.
Seventh embodiment
Fig. 20 is a schematic structural diagram of a wide-angle lens 700 according to the present embodiment. The wide-angle lens 700 in this embodiment is substantially the same as the wide-angle lens 100 in the first embodiment, except that the image-side surface S6 of the third lens of the wide-angle lens 700 in this embodiment is convex, the image-side surface S11 of the sixth lens is concave, and the curvature radius and material selection of each lens are different, and specific parameters of each lens are shown in table 7-1.
TABLE 7-1
The aspherical surface parameters of each lens of this example are shown in Table 7-2.
TABLE 7-2
In the present embodiment, the distortion and the axial chromatic aberration are shown in fig. 21 and 22, respectively. Fig. 21 shows that distortion of the wide-angle lens 700 of this embodiment is substantially zero within a half field angle of 14 °, which indicates that a picture of the wide-angle lens 700 within the half field angle of 14 ° can accommodate more pixel numbers, and the imaging capability of the wide-angle lens 700 for a long-distance view within the half field angle of 14 ° can be effectively improved. As can be seen from fig. 22, the single wavelength of the axial chromatic aberration of wide-angle lens 700 of the present embodiment is not more than 0.05mm at maximum, and the difference between two different wavelengths is not more than 0.01 mm.
Table 8 shows the 7 embodiments and their corresponding optical characteristics, including the field angle 2 θ, F # and total optical length TTL, and the values corresponding to each of the foregoing conditional expressions.
TABLE 8
The above embodiments are combined to achieve the following optical indexes: (1) the field angle: 2 theta > 120 DEG; (2) total optical length: TTL is less than 25.0 mm; (3) f # < 1.6; (4) the applicable spectral range is as follows: 400 nm-700 nm.
In the wide-angle lens provided by the invention, the first lens is arranged by adopting a special aspheric surface type, the surface inclination angle of the object side surface of the first lens has the characteristics that the surface inclination angle gradually increases from the central vertex of the lens to the outer part of the middle area of the semi-caliber of the lens, the surface inclination angle reaches the maximum in the middle area of the semi-caliber of the lens, and the surface inclination angle gradually decreases from the outer part of the middle area of the semi-caliber of the lens to the edge area of the semi-caliber of the lens; the second lens is a meniscus aspheric thick lens with a concave surface facing the object side and is mainly used for correcting distortion and field curvature; the third lens and the fourth lens are both lenses with positive focal power, and the third lens and the fourth lens are distributed on two sides of the diaphragm, so that the spherical aberration of the wide-angle lens can be effectively corrected, the focal power can be effectively shared, and the tolerance sensitivity of the two lenses is reduced; meanwhile, the diaphragm is arranged between the third lens and the fourth lens, so that the distance from the diaphragm to the vertex of the object side surface of the first lens is close to the distance from the diaphragm to the vertex of the image side surface of the seventh lens, and compared with other optical lenses, the wide-angle lens can ensure that the front end aperture and the rear end aperture are smaller, and the size of the lens is effectively reduced; the difference value of the abbe number Vd of a positive and negative focal power lens formed by the fifth lens and the sixth lens is more than 40, so that chromatic aberration can be effectively corrected; the seventh lens has the retroflection characteristic, and compared with a common aspheric surface type without the retroflection characteristic, the seventh lens can play a better role in eliminating aberration and controlling the emergent angle of a chief ray, effectively improves the resolving power of the wide-angle lens, and enables the wide-angle lens to have higher pixels.
Eighth embodiment
An imaging device 800 is further provided in the present embodiment, and as shown in fig. 23, the imaging device 800 includes an imaging element 810 and a wide-angle lens (e.g., wide-angle lens 100) in any of the embodiments described above. The imaging element 810 may be a CMOS (Complementary Metal Oxide Semiconductor) image sensor, and may also be a CCD (Charge Coupled Device) image sensor.
The imaging device 800 may be a drone, an in-vehicle monitor, or any other electronic device equipped with the wide-angle lens 100.
The imaging device 800 provided by the embodiment of the present application includes the wide-angle lens in any of the above embodiments, and since the wide-angle lens has the advantages of small volume and high pixels, the imaging device 800 having the wide-angle lens also has the advantages of small volume and high pixels.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A wide-angle lens is characterized by comprising a first lens, a second lens, a third lens, a diaphragm, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an optical filter in sequence from an object side to an imaging surface;
the first lens has negative focal power, and the object side surface and the image side surface of the first lens are convex and concave;
the object side surface of the second lens is a concave surface, and the image side surface of the second lens is a convex surface;
the third lens has positive focal power, the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a concave surface or 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 concave surface or a convex surface;
the fifth lens has positive focal power, and both the object-side surface and the image-side surface of the fifth lens are convex surfaces;
the sixth lens has negative focal power, the object side surface of the sixth lens is a concave surface, and the fifth lens and the sixth lens form a bonding body;
the object-side surface of the seventh lens element is convex at a paraxial region thereof, the image-side surface of the seventh lens element is concave at a paraxial region thereof, and both the object-side surface and the image-side surface of the seventh lens element have at least one inflection point;
the first lens satisfies the following conditional expression:
1.5＜r1/r2＜2.5；
-2＜f1/f＜-1；
0＜ωD/ωmax＜0.6；
2＜LD/Lmax＜3；
wherein r is1Represents a radius of curvature, r, of an object-side surface of the first lens2Represents a radius of curvature of an image side surface of the first lens, f1Denotes a focal length of the first lens, f denotes a focal length of the wide-angle lens, ωDRepresenting the face tilt angle, omega, at the object side edge aperture of the first lensmaxRepresents the maximum surface inclination angle L in the full aperture of the object side surface of the first lensDA radial length L representing a position of a face tilt angle at an object side face edge aperture of the first lensmaxThe radial length of the position where the maximum plane inclination angle in the full aperture of the object side surface of the first lens is located is represented.
2. The wide-angle lens of claim 1, wherein the seventh lens satisfies a conditional expression:
0.3＜r12/r13＜1.6；
0.8＜CT7/ET7＜1.6；
wherein r is12Represents a radius of curvature, r, of an object-side surface of the seventh lens13Represents a radius of curvature of an image side surface of the seventh lens, CT7Denotes the center thickness, ET, of the seventh lens7The thickness of the lens at the edge aperture of the seventh lens is indicated.
3. The wide-angle lens of claim 1, wherein the wide-angle lens satisfies the following conditional expression:
1＜f3/f4+r5/r7＜2.3；
wherein f is3Denotes the focal length of the third lens, f4Denotes the focal length, r, of the fourth lens5Represents a radius of curvature, r, of an object-side surface of the third lens7Represents a radius of curvature of an object side surface of the fourth lens.
4. The wide-angle lens of claim 1, wherein the wide-angle lens satisfies the following conditional expression:
0.9＜L1S/LS7＜1.2；
0.5＜f4/r7＜2.2；
wherein L is1SDenotes the vertical distance, L, from the vertex of the object-side surface of the first lens to the diaphragmS7Representing the vertical distance, f, of the stop to the apex of the image-side surface of the seventh lens4Denotes the focal length, r, of the fourth lens7Represents a radius of curvature of an object side surface of the fourth lens.
5. The wide-angle lens of claim 1, wherein the wide-angle lens satisfies the following conditional expression:
1.3＜Dmax/DST＜2；
2.5＜L/DST＜3.5；
wherein D ismaxDenotes the radial length, D, of the first lensSTDenotes the radial length of the diaphragm, L denotes the first lensTo a vertex of an image-side surface of the seventh lens.
6. The wide-angle lens of claim 1, wherein the second lens satisfies the following conditional expression:
0.3＜r3/r4＜1.5；
-0.2＜CT2/f2＜0.2；
wherein r is3Represents a radius of curvature, r, of an object-side surface of the second lens4Representing the radius of curvature of the image-side surface of the second lens, CT2Represents the center thickness of the second lens, f2Representing the focal length of the second lens.
7. The wide-angle lens of claim 1, wherein the second lens satisfies the following conditional expression:
0.2＜CT1/ CT2＜0.6；
-10＜r3/r2＜-4；
wherein r is2Represents a radius of curvature, r, of an image-side surface of the first lens3Representing the radius of curvature of the object-side surface of the second lens, CT1Representing the center thickness, CT, of the first lens2Representing the center thickness of the second lens.
8. The wide-angle lens of claim 1, wherein an F # of the wide-angle lens is < 1.6.
9. The wide-angle lens of claim 1, wherein the third lens, the fourth lens, the fifth lens, and the sixth lens are all glass spherical lenses, and the first lens, the second lens, and the seventh lens are all glass aspherical lenses.
10. An imaging apparatus comprising the wide-angle lens according to any one of claims 1 to 9, and an imaging element for converting an optical image formed by the wide-angle lens into an electrical signal.
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| CN112630943A (en) * | 2021-03-10 | 2021-04-09 | 江西联创电子有限公司 | Optical imaging lens and imaging apparatus |
| CN112987263A (en) * | 2021-04-27 | 2021-06-18 | 江西联创电子有限公司 | Fixed-focus lens and imaging device |
| WO2022033277A1 (en) * | 2020-08-10 | 2022-02-17 | 江西联创电子有限公司 | Wide-angle lens and imaging device |
| WO2022056868A1 (en) * | 2020-09-18 | 2022-03-24 | 欧菲光集团股份有限公司 | Optical imaging system, image capturing module, electronic device, and mobile device |
| WO2022089344A1 (en) * | 2020-10-26 | 2022-05-05 | 江西联益光学有限公司 | Optical lens and imaging device |
| EP4231078A1 (en) * | 2022-02-17 | 2023-08-23 | Calin Technology Co., Ltd. | Optical imaging lens |
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| WO2022033277A1 (en) | 2022-02-17 |
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