CN212483964U - Wide-angle lens - Google Patents
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- CN212483964U CN212483964U CN202022054920.5U CN202022054920U CN212483964U CN 212483964 U CN212483964 U CN 212483964U CN 202022054920 U CN202022054920 U CN 202022054920U CN 212483964 U CN212483964 U CN 212483964U
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Abstract
The utility model discloses a wide-angle lens, which comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens which are arranged in sequence from an object plane to an image plane along an optical axis; the first lens, the second lens, the fourth lens and the sixth lens are negative focal power lenses, and the third lens, the fifth lens and the seventh lens are positive focal power lenses; the focal length of the first lens is f1, the focal length of the second lens is f2, the focal length of the third lens is f3, the focal length of the fourth lens is f4, the focal length of the fifth lens is f5, the focal length of the sixth lens is f6, the focal length of the seventh lens is f7, and the focal length of the wide-angle lens is f, wherein: | f1/f | is more than or equal to 1.1 and less than or equal to 2.4; the | f2/f | is more than or equal to 4.2; | f3/f | is more than or equal to 0.7 and less than or equal to 2.85; | f4/f | is more than or equal to 2.5; | f5/f | is more than or equal to 0.6 and less than or equal to 2.9; | f6/f | is more than or equal to 0.33 and less than or equal to 1.87; the absolute value of f7/f is more than or equal to 0.55 and less than or equal to 2.73. The utility model provides a wide-angle lens guarantees under low-cost prerequisite, satisfies super large luminous flux, realizes the control demand under the low light level condition.
Description
Technical Field
The embodiment of the utility model provides a relate to optical device technical field, especially relate to a wide-angle lens.
Background
With the increasing trend of security monitoring field, networking and intellectualization, the application range of the camera is more and more extensive, and various cameras with various functions, especially low-illumination high-definition cameras, are required to be installed in places with poor monitoring conditions and dim light so as to meet the requirement of all-weather 24-hour monitoring. For low-illumination environments such as at night, if the camera collects insufficient light, the situation of dark pictures can be caused, and the definition is influenced. For improving the low illumination performance of a camera, the lens with the ultra-large aperture is one of the key technologies, and therefore, a wide-angle lens with a large aperture needs to be developed to solve the problems.
SUMMERY OF THE UTILITY MODEL
The utility model provides a wide-angle lens to realize the wide-angle lens of big light ring, guarantee under the prerequisite of low cost, satisfy super large light flux, realize the control demand under the low light level condition.
In a first aspect, an embodiment of the present invention provides a wide-angle lens, including a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens, which are sequentially arranged from an object plane to an image plane along an optical axis;
the first lens is a negative focal power lens, the second lens is a negative focal power lens, the third lens is a positive focal power lens, the fourth lens is a negative focal power lens, the fifth lens is a positive focal power lens, the sixth lens is a negative focal power lens, and the seventh lens is a positive focal power lens;
the focal length of the first lens is f1, the focal length of the second lens is f2, the focal length of the third lens is f3, the focal length of the fourth lens is f4, the focal length of the fifth lens is f5, the focal length of the sixth lens is f6, the focal length of the seventh lens is f7, and the focal length of the wide-angle lens is f, wherein:
1.1≤|f1/f|≤2.4；|f2/f|≥4.2；0.7≤|f3/f|≤2.85；2.5≤|f4/f|；0.6≤|f5/f|≤2.9；0.33≤|f6/f|≤1.87；0.55≤|f7/f|≤2.73。
optionally, the third lens is a glass spherical lens; the first lens, the second lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens are all plastic aspherical lenses.
Optionally, the wide-angle lens further includes a diaphragm disposed in an optical path between the fourth lens and the fifth lens.
Optionally, the refractive index of the second lens is n 2; the refractive index of the third lens is n3, and the Abbe number is v 3; wherein:
1.43≤n2≤1.75；n3≥1.65，22≤v3≤56。
optionally, a clear aperture of the first lens is D1, and a distance between an optical axis center of an image-side surface of the seventh lens and the image plane is BFL, where | D1/BFL | ≧ 1.8.
Optionally, an air interval between the fifth lens and the sixth lens is TH56, an air interval between the sixth lens and the seventh lens is TH67, and a distance from an optical axis center of an object-side surface of the first lens to an image plane is TTL, where TH56/TTL is greater than or equal to 0, and/or TH67/TTL is greater than or equal to 0.
Optionally, the fourth lens is a meniscus lens.
Optionally, a distance between an optical axis center of an image-side surface of the seventh lens element and the image plane is BFL, a distance between an optical axis center of an object-side surface of the first lens element and the image plane is TTL, and BFL/TTL is greater than or equal to 0.05 and less than or equal to 0.88.
Optionally, the F-number of the wide-angle lens is F, wherein F is greater than or equal to 0.8 and less than or equal to 1.2.
Optionally, the field angle of the wide-angle lens is FOV, wherein, FOV is greater than or equal to 100 degrees and less than or equal to 120 degrees.
The embodiment of the utility model provides a wide-angle lens, through the lens quantity in the reasonable wide-angle lens that sets up, the focal power of each lens and the relative relation between each lens focus, under low-cost prerequisite, guarantee the equilibrium of the angle of incidence size of group's lens around the wide-angle lens, reduce the sensitivity of camera lens, and correct the aberration when super large light ring, guarantee that the wide-angle lens has higher power of resolving an image, thereby guarantee the wide-angle lens under the prerequisite of less diaphragm number, satisfy super large light flux, realize the high definition control demand under the low light intensity condition
Drawings
Fig. 1 is a schematic structural diagram of a wide-angle lens provided in an embodiment of the present invention;
fig. 2 is a spherical aberration curve chart of a wide-angle lens according to an embodiment of the present invention;
fig. 3 is a light fan diagram of a wide-angle lens according to an embodiment of the present invention;
fig. 4 is a visible light spot diagram of a wide-angle lens according to an embodiment of the present invention;
fig. 5 is a dot-column diagram of a wide-angle lens provided by an embodiment of the present invention at a wavelength of 436 nm;
fig. 6 is a field curvature distortion diagram of a wide-angle lens according to an embodiment of the present invention;
fig. 7 is an MTF diagram of a wide-angle lens according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Fig. 1 is a schematic structural diagram of a wide-angle lens according to an embodiment of the present invention, as shown in fig. 1, the wide-angle lens according to an embodiment of the present invention includes a first lens 110, a second lens 120, a third lens 130, a fourth lens 140, a fifth lens 150, a sixth lens 160, and a seventh lens 170, which are sequentially arranged from an object plane to an image plane along an optical axis; the first lens 110 is a negative focal power lens, the second lens 120 is a negative focal power lens, the third lens 130 is a positive focal power lens, the fourth lens 140 is a negative focal power lens, the fifth lens 150 is a positive focal power lens, the sixth lens 160 is a negative focal power lens, and the seventh lens 170 is a positive focal power lens; the focal length of the first lens is f1, the focal length of the second lens is f2, the focal length of the third lens is f3, the focal length of the fourth lens is f4, the focal length of the fifth lens is f5, the focal length of the sixth lens is f6, the focal length of the seventh lens is f7, and the focal length of the wide-angle lens is f, wherein: | f1/f | is more than or equal to 1.1 and less than or equal to 2.4; the | f2/f | is more than or equal to 4.2; | f3/f | is more than or equal to 0.7 and less than or equal to 2.85; | f4/f | is more than or equal to 2.5; | f5/f | is more than or equal to 0.6 and less than or equal to 2.9; | f6/f | is more than or equal to 0.33 and less than or equal to 1.87; the absolute value of f7/f is more than or equal to 0.55 and less than or equal to 2.73.
Illustratively, the optical power is equal to the difference between the image-side and object-side beam convergence, which characterizes the ability of the optical system to deflect light. The larger the absolute value of the focal power is, the stronger the bending ability to the light ray is, and the smaller the absolute value of the focal power is, the weaker the bending ability to the light ray is. When the focal power is positive, the refraction of the light is convergent; when the focal power is negative, the refraction of the light is divergent. The optical power can be suitable for representing a certain refractive surface of a lens (namely, a surface of the lens), can be suitable for representing a certain lens, and can also be suitable for representing a system (namely a lens group) formed by a plurality of lenses together. In the wide-angle lens provided in the present embodiment, each lens may be fixed in a lens barrel (not shown in fig. 1), and the first lens 110 is set to be a negative power lens for controlling the incident angle of light rays of the optical system; the second lens 120, the fourth lens 140, and the sixth lens 160 are negative power lenses; the third lens 130, the fifth lens 150, and the seventh lens 170 are positive power lenses; the fifth lens 150, the sixth lens 160 and the seventh lens 170 are used for correcting off-axis aberrations including field curvature, coma, astigmatism and the like. The focal power of the whole wide-angle lens is distributed according to a certain proportion, and the balance of the incident angles of the front and rear lens groups is ensured, so that the sensitivity of the lens is reduced, and the production possibility is improved.
Further, the focal length f1 of the first lens 110, the focal length f2 of the second lens 120, the focal length f3 of the third lens 130, the focal length f4 of the fourth lens 140, the focal length f5 of the fifth lens 150, the focal length f6 of the sixth lens 160, the focal length f7 of the seventh lens 170, and the focal length f of the wide-angle lens are set to satisfy: | f1/f | is more than or equal to 1.1 and less than or equal to 2.4; the | f2/f | is more than or equal to 4.2; | f3/f | is more than or equal to 0.7 and less than or equal to 2.85; | f4/f | is more than or equal to 2.5; | f5/f | is more than or equal to 0.6 and less than or equal to 2.9; | f6/f | is more than or equal to 0.33 and less than or equal to 1.87; the absolute value of f7/f is more than or equal to 0.55 and less than or equal to 2.73. Through each lens focus of rational distribution, be favorable to the correction of aberration when the super large light ring, guarantee that this camera lens has higher resolving power.
The embodiment of the utility model provides a wide-angle lens, through the lens quantity in the reasonable wide-angle lens that sets up, the focal power of each lens and the relative relation between each lens focus, under low-cost prerequisite, guarantee the equilibrium of the angle of incidence size of group's lens around the wide-angle lens, reduce the sensitivity of camera lens, and correct the aberration when super large light ring, guarantee that the wide-angle lens has higher power of resolving an image, thereby guarantee the wide-angle lens under the prerequisite of less diaphragm number, satisfy super large light flux, realize the high definition control demand under the low light intensity condition
Optionally, the third lens 130 is a glass spherical lens, and the first lens 110, the second lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens are all plastic aspheric lenses.
The third lens 130 is a glass spherical lens, the first lens 110, the second lens 120, the fourth lens 140, the fifth lens 150, the sixth lens 160 and the seventh lens 170 are all plastic aspheric lenses, and the aspheric lenses have the function of correcting all high-order aberrations. Because the lens cost of plastics material is far less than the lens cost of glass material, the embodiment of the utility model provides an in the wide-angle camera lens, through setting up 6 plastics aspheric lens, the image quality is good, and is with low costs. And because the two materials have the mutual compensation function, the wide-angle lens can still be normally used in high and low temperature environments.
With continued reference to fig. 1, optionally, the wide-angle lens provided in the embodiment of the present invention further includes a diaphragm 180, where the diaphragm 180 is disposed in the optical path between the fourth lens 140 and the fifth lens 150.
By arranging the diaphragm 180 in the optical path between the fourth lens 140 and the fifth lens 150, the propagation direction of the light beam can be adjusted, and the incident angle of the light beam can be adjusted, which is beneficial to improving the imaging quality.
Optionally, the refractive index of the second lens 120 is n 2; the refractive index of the third lens 130 is n3, and the Abbe number is v 3; wherein n2 is more than or equal to 1.43 and less than or equal to 1.75; n3 is more than or equal to 1.65, v3 is more than or equal to 22 and less than or equal to 56.
The refractive index is the ratio of the propagation speed of light in vacuum to the propagation speed of light in the medium, and is mainly used for describing the refractive power of materials to light, and the refractive indexes of different materials are different. The abbe number is an index for expressing the dispersion capability of the transparent medium, and the more severe the dispersion of the medium is, the smaller the abbe number is; conversely, the more slight the dispersion of the medium, the greater the abbe number. Therefore, the balance of the incident angles of the front and rear groups of lenses is ensured by matching the refractive index and the Abbe number of each lens in the wide-angle lens, so that the sensitivity of the lens is reduced, and the production possibility is improved; meanwhile, the method is favorable for realizing higher pixel resolution and larger aperture.
Optionally, the clear aperture of the first lens element 110 is D1, and a distance between an optical axis center of an image-side surface of the seventh lens element 170 and the image plane is BFL, where | D1/BFL | ≧ 1.8.
The distance from the optical axis center of the image-side surface of the seventh lens element 170 to the image plane can be understood as the back focus (In air) of the wide-angle lens, and the maximum clear aperture D1 of the first lens element 110 and the back focus BFL of the wide-angle lens are reasonably set to satisfy | D1/BFL | ≧ 1.8, so that the light entering amount of the wide-angle lens is satisfied, and the whole wide-angle lens is small.
Optionally, the air interval between the fifth lens 150 and the sixth lens 160 is TH56, the air interval between the sixth lens 160 and the seventh lens 170 is TH67, and the distance from the optical axis center of the object-side surface of the first lens 110 to the image plane is TTL, where TH56/TTL is greater than or equal to 0, and/or TH67/TTL is greater than or equal to 0.
The distance from the optical axis center of the object side surface of the first lens 110 to the image plane can be understood as the total length (In air) of the wide-angle lens, and the total length of the air space is reasonably restricted by setting TH56/TTL to be more than or equal to 0 and/or TH67/TTL to be more than or equal to 0, so that the lens structure is more compact, and the effective focal length and the total length of the wide-angle lens are still In a reasonable range while the large aperture is realized.
Illustratively, the TH56/TTL is set to 0, and/or the TH67/TTL is set to 0, the fifth lens 150 and the sixth lens 160 may be combined into a cemented lens by cementing the image-side surface of the fifth lens 150 with the object-side surface of the sixth lens 160, and/or the sixth lens 160 and the seventh lens 170 may be combined into a cemented lens by cementing the image-side surface of the sixth lens 160 with the object-side surface of the seventh lens 170, and/or the sixth lens 160 and the seventh lens 170 may be combined into a cemented lens; the use of the cemented lens can effectively reduce the air space between the fifth lens 150 and the sixth lens 160, and/or the air space between the sixth lens 160 and the seventh lens 170, thereby reducing the overall lens length. In addition, the cemented lens can be used for reducing chromatic aberration or eliminating chromatic aberration to the maximum extent, so that various aberrations of the wide-angle lens can be fully corrected, the resolution can be improved, and optical performances such as distortion, CRA and the like can be optimized on the premise of compact structure; and the light quantity loss caused by reflection between the lenses can be reduced, and the illumination is improved, so that the image quality is improved, and the imaging definition of the lens is improved. In addition, the use of the cemented lens can also reduce the assembly parts between the two lenses, simplify the assembly procedure in the lens manufacturing process, reduce the cost, and reduce the tolerance sensitivity problems of the lens unit, such as inclination/decentration, and the like, generated in the assembly process.
Optionally, the fourth lens 140 is a meniscus lens.
The meniscus lens is composed of two spherical surfaces with small curvature radius and small numerical value difference, and the fourth lens 140 is a meniscus lens, so that the field curvature can be corrected.
Optionally, a distance from an optical axis center of an image-side surface of the seventh lens element 170 to the image plane is BFL, and a distance from an optical axis center of an object-side surface of the first lens element 110 to the image plane is TTL, where BFL/TTL is greater than or equal to 0.05 and less than or equal to 0.88.
Wherein, the distance BFL from the optical axis center of the image side of the seventh lens element 170 to the image plane can be understood as the back focal length of the wide-angle lens, and the distance TTL from the optical axis center of the object side of the first lens element 110 to the image plane can be understood as the total length of the wide-angle lens, and by reasonably setting the relationship between the back focal length of the wide-angle lens and the total length of the wide-angle lens, the compact structure of the whole wide-angle lens can be ensured, and the integration of the wide-angle lens is high.
Optionally, the embodiment of the utility model provides a wide-angle lens's F number is F, and wherein, 0.8 is less than or equal to F and is less than or equal to 1.2.
The embodiment of the utility model provides a wide-angle lens is a big light ring wide-angle lens, satisfies super large throughput, is applicable to the control demand under the low light level condition.
Optionally, the wide-angle lens provided by the embodiment of the present invention has a field of view FOV, wherein, the FOV is greater than or equal to 100 degrees and less than or equal to 120 degrees.
The embodiment of the utility model provides a wide-angle lens is a wide-angle lens of great angle of vision, satisfies the requirement of big visual field.
The embodiment of the utility model provides a wide-angle lens, through the focal power of each lens of rational distribution, the refracting index, abbe number etc., under low-cost prerequisite, guarantee the equilibrium of the angle of incidence size of group's lens around the wide-angle lens, reduce the sensitivity of camera lens, and correct the aberration when super large light ring, guarantee that the wide-angle lens has higher power of resolving an image, thereby guarantee that the wide-angle lens is under the prerequisite of less diaphragm number, satisfy super large luminous flux, realize the high definition control demand under the low light intensity condition
As a possible embodiment, the radius of curvature, thickness, material, and K-factor of each lens surface in the wide-angle lens are explained below.
TABLE 1 design values of radius of curvature, thickness, material and K-factor of wide-angle lens
With reference to fig. 1, the wide-angle lens provided by the embodiment of the present invention includes a first lens 110, a second lens 120, a third lens 130, a fourth lens 140, a fifth lens 150, a sixth lens 160, and a seventh lens 170, which are sequentially arranged from an object plane to an image plane along an optical axis. Table 1 shows optical physical parameters such as a curvature radius, a thickness, and a material of each lens in the wide-angle lens provided in the embodiment. The surface numbers are numbered according to the surface sequence of the lenses, for example, "1" represents the object plane surface of the first lens 110, "2" represents the image plane surface of the first lens 110, "10" represents the object plane surface of the fifth lens 150, "11" represents the image plane surface of the fifth lens 150, and so on; the curvature radius represents the bending degree of the surface of the lens, a positive value represents that the surface is bent to the image surface side, and a negative value represents that the surface is bent to the object surface side; thickness represents the central axial distance from the current surface to the next surface, and the radius of curvature and thickness are both in millimeters (mm).
In addition to the above implementation, optionally, the third lens 130 is a glass spherical lens, and the first lens 110, the second lens 120, the fourth lens 140, the fifth lens 150, the sixth lens 160, and the seventh lens 170 are all plastic aspheric lenses. The embodiment of the utility model provides a wide-angle lens still includes diaphragm 180(STO), can adjust the direction of propagation of light beam through addding diaphragm 180, is favorable to improving imaging quality. The diaphragm 180 may be located in the optical path between the fourth lens 140 and the fifth lens 150, but the embodiment of the invention is not limited to the specific location of the diaphragm 180.
The aspherical surface shape equation Z of the first lens 110, the second lens 120, the third lens 130, the fourth lens 140, the fifth lens 150, the sixth lens 160, and the seventh lens 170 satisfies:
wherein Z is the distance rise from the vertex of the aspheric surface when the aspheric surface is at the position with the height of y along the optical axis direction; c is 1/R, R represents the paraxial radius of curvature of the mirror surface; k is the cone coefficient; A. b, C, D, E, F is a high-order aspheric coefficient, where Z, R and y are both in mm.
Illustratively, table 2 details the aspheric coefficients of the lenses of the present embodiment in one possible implementation.
TABLE 2 aspheric coefficients in Wide-Angle lens
wherein-3.82E-03 indicates that the coefficient A with the face number of 1 is-3.82 x 10-3And so on.
The wide-angle lens provided by the embodiment achieves the following technical indexes:
TONG diameter: n is 3.65;
aperture: f is 1.0;
TTL/BFL＝5.3；
the field angle: 2w is more than or equal to 100 degrees;
resolution ratio: can be adapted to 500 ten thousand pixel high resolution CCD or CMOS cameras.
Further, fig. 2 is a spherical aberration curve chart of the wide-angle lens provided by the embodiment of the present invention, as shown in fig. 2, the spherical aberration of the wide-angle lens under different wavelengths (0.486 μm, 0.588 μm and 0.656 μm) is all within 0.05mm, and different wavelength curves are relatively concentrated, which means that the axial aberration of the wide-angle lens is very small, so that the embodiment of the present invention provides a wide-angle lens capable of better correcting aberration.
Fig. 3 is a light fan diagram of a wide-angle lens according to an embodiment of the present invention, as shown in fig. 3, the imaging ranges of different wavelengths of light (0.486 μm, 0.588 μm and 0.656 μm) under different angles of view of the wide-angle lens are all within 30 μm and the curves are very concentrated, so that it is ensured that the aberrations of different field regions are small, i.e. it is explained that the aberration of the wide-angle lens is better corrected.
Fig. 4 is a visible light spot diagram of a wide-angle lens according to an embodiment of the present invention, wherein the spot diagram is one of the most common evaluation methods in modern optical design. The point diagram is that after many light rays emitted by a point light source pass through an optical system, intersection points of the light rays and an image surface are not concentrated on the same point any more due to aberration, and a diffusion pattern scattered in a certain range is formed. As shown in fig. 4, in the wide-angle lens provided in the embodiment of the present invention, the dispersion patterns of the visible light rays (0.4861 μm, 0.5876 μm, and 0.6563 μm) with different wavelengths under each field are relatively concentrated, the distribution is relatively uniform, and the dispersion patterns under a certain field are not separated from each other up and down along with the wavelength, which indicates that there is no obvious purple edge. Meanwhile, the root mean square radius values (RMS radius) of the visible rays (0.4861 μm, 0.5876 μm and 0.6563 μm) with different wavelengths at each field position of the wide-angle lens are respectively 1.402mm, 2.022mm, 2.420mm, 2.305mm, 2.398mm and 2.460mm, which shows that the RMS radius of each field is less than 2.5 μm, namely that the wide-angle lens has lower chromatic aberration and aberration under the full field, solves the purple boundary problem of visible light band imaging, and can realize high-resolution imaging.
Fig. 5 is the utility model provides a point is listed as picture under 436nm wavelength for a wide-angle lens, as shown in fig. 5, the embodiment of the utility model provides a wide-angle lens, the wavelength is that 436 nm's light is more concentrated under each field of view's diffusion figure, and it is also more even to distribute, and the diffusion figure under certain field of view does not appear separates very open phenomenon from top to bottom along with the wavelength, explains not to have obvious purple boundary. Meanwhile, the root mean square radius (RMS radius) values of the light with the wavelength of 436 mu m at each field position of the wide-angle lens are 6.533mm, 6.957mm, 6.835mm, 7.007mm, 6.877mm and 7.223mm respectively, which shows that the wide-angle lens also performs better aberration and chromatic aberration correction under the visible light with shorter wavelength, solves the purple edge problem of visible light wave band imaging, and can realize high-resolution imaging.
Fig. 6 is a field curvature distortion diagram of a wide-angle lens according to an embodiment of the present invention, as shown in fig. 6, a field curvature of the wide-angle lens according to an embodiment of the present invention is smaller, that is, a difference between a central image quality and a peripheral image quality is smaller during imaging; the imaging distortion is small, and the requirement of low distortion is met.
Fig. 7 is an MTF diagram of a wide-angle lens according to an embodiment of the present invention, as shown in fig. 7, the transfer function of 160 line pairs/mm in the MTF curve is substantially all above 0.4, the image quality is high, and the requirement for resolution of 500 ten thousand pixels is met.
To sum up, the embodiment of the utility model provides a wide-angle lens has big light ring, and high image quality and the advantage that does not have obvious purple boundary, and the design adopts 7 piece formula structures, under the lower circumstances of cost, reaches 5MP image quality demands, adopts the glass to mould the structure of mixing and can satisfy the demand that does not run burnt under-30 ℃ -80 ℃ of environment.
It should be noted that the foregoing is only a preferred embodiment of the present invention and the technical principles applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail with reference to the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the scope of the present invention.
Claims (10)
1. A wide-angle lens is characterized by comprising a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens which are sequentially arranged from an object plane to an image plane along an optical axis;
the first lens is a negative focal power lens, the second lens is a negative focal power lens, the third lens is a positive focal power lens, the fourth lens is a negative focal power lens, the fifth lens is a positive focal power lens, the sixth lens is a negative focal power lens, and the seventh lens is a positive focal power lens;
the focal length of the first lens is f1, the focal length of the second lens is f2, the focal length of the third lens is f3, the focal length of the fourth lens is f4, the focal length of the fifth lens is f5, the focal length of the sixth lens is f6, the focal length of the seventh lens is f7, and the focal length of the wide-angle lens is f, wherein:
1.1≤|f1/f|≤2.4；|f2/f|≥4.2；0.7≤|f3/f|≤2.85；2.5≤|f4/f|；0.6≤|f5/f|≤2.9；0.33≤|f6/f|≤1.87；0.55≤|f7/f|≤2.73。
2. the wide-angle lens of claim 1, wherein the third lens is a glass spherical lens; the first lens, the second lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens are all plastic aspherical lenses.
3. The wide-angle lens of claim 1, further comprising an aperture disposed in an optical path between the fourth lens and the fifth lens.
4. The wide-angle lens of claim 1, wherein the second lens has a refractive index of n 2; the refractive index of the third lens is n3, and the Abbe number is v 3; wherein:
1.43≤n2≤1.75；n3≥1.65，22≤v3≤56。
5. the wide-angle lens of claim 1, wherein the clear aperture of the first lens is D1, and the distance between the center of the optical axis of the image-side surface of the seventh lens and the image plane is BFL, wherein | D1/BFL | ≧ 1.8.
6. The wide-angle lens of claim 1, wherein an air interval between the fifth lens and the sixth lens is TH56, an air interval between the sixth lens and the seventh lens is TH67, and a distance from an optical axis center of an object-side surface of the first lens to an image plane is TTL, wherein TH56/TTL is greater than or equal to 0, and/or TH67/TTL is greater than or equal to 0.
7. The wide-angle lens of claim 1, wherein the fourth lens is a meniscus lens.
8. The wide-angle lens of claim 1, wherein a distance between an optical axis center of an image-side surface of the seventh lens and the image plane is BFL, and a distance between an optical axis center of an object-side surface of the first lens and the image plane is TTL, and wherein BFL/TTL is 0.05 or more and 0.88 or less.
9. The wide-angle lens of claim 1, having an F-number of F, wherein F is 0.8 ≦ 1.2.
10. The wide-angle lens of claim 1, having a field of view FOV, wherein 100 ° ≦ FOV ≦ 120 °.
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| CN202022054920.5U CN212483964U (en) | 2020-09-18 | 2020-09-18 | Wide-angle lens |
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| CN202022054920.5U Active CN212483964U (en) | 2020-09-18 | 2020-09-18 | Wide-angle lens |
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