CN112558282A - Wide-angle optical imaging lens - Google Patents
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- CN112558282A CN112558282A CN202011523740.5A CN202011523740A CN112558282A CN 112558282 A CN112558282 A CN 112558282A CN 202011523740 A CN202011523740 A CN 202011523740A CN 112558282 A CN112558282 A CN 112558282A
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
- G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
- G02B13/0045—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having five or more lenses
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/06—Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces
Abstract
The invention relates to the technical field of lenses. The invention discloses a wide-angle optical imaging lens, which comprises six lenses; the first lens and the fourth lens are both convex-concave lenses with negative refractive index; the third lens, the fifth lens and the sixth lens are all convex lenses with positive refractive index; the second lens is a concave lens with negative refractive index, the second lens and the sixth lens are both plastic aspheric lenses, the first lens, the third lens, the fourth lens and the fifth lens are all glass lenses, and the fourth lens and the fifth lens are mutually glued; the wide-angle optical imaging lens meets the following requirements: D11/T1< 11.5. The invention has the advantages of large field angle, large light transmission, higher relative illumination, high resolution, good imaging quality, more edge pixels due to positive F-Theta distortion, less image compression, small temperature drift and good shock resistance.
Description
Technical Field
The invention belongs to the technical field of lenses, and particularly relates to a wide-angle optical imaging lens which is particularly suitable for the vehicle-mounted field.
Background
With the continuous progress of scientific technology and the continuous development of society, in recent years, optical imaging lenses are also rapidly developed, and the optical imaging lenses are widely applied to various fields such as smart phones, tablet computers, video conferences, security monitoring, law enforcement recording, vehicle monitoring and the like, so that the requirements on the optical imaging lenses are increasingly improved.
However, the existing vehicle-mounted all-round lens has many defects, such as small clear aperture and low imaging contrast value; the field angle is generally less than 180 degrees and is only 200 degrees at most, and the field of view is insufficient; pixels are typically only 720P or 1080P; due to the wide-angle design, the imaging effect of the edge field is slightly poor, and the edge distortion is large; when the lens is used in a high-temperature or low-temperature environment for a long time, the lens is easy to be burnt, and the imaging is fuzzy; the impact resistance is to be improved, and the requirements of consumers for increasing increase cannot be met, so that the improvement is urgently needed.
Disclosure of Invention
The present invention is directed to a wide-angle optical imaging lens for solving at least one of the above problems.
In order to achieve the purpose, the invention adopts the technical scheme that: a wide-angle optical imaging lens sequentially comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a fourth lens from an object side to an image side along an optical axis; the first lens, the second lens, the third lens and the fourth lens are respectively arranged on the object side and the image side, and the object side faces towards the object side and enables the imaging light rays to pass through;
the first lens element with negative refractive index has a convex object-side surface and a concave image-side surface;
the second lens element with negative refractive index has a concave object-side surface and a concave image-side surface;
the third lens element with positive refractive index has a convex object-side surface and a convex image-side surface;
the fourth lens element with negative refractive index has a convex object-side surface and a concave image-side surface;
the fifth lens element with positive refractive index has a convex object-side surface and a convex image-side surface;
the sixth lens element with positive refractive index has a convex object-side surface and a convex image-side surface;
the second lens and the sixth lens are both plastic aspheric lenses, the first lens, the third lens, the fourth lens and the fifth lens are all glass lenses, and the fourth lens and the fifth lens are mutually glued;
the wide-angle optical imaging lens meets the following requirements: D11/T1<11.5, wherein D11 is the clear aperture of the object side surface of the first lens, and T1 is the thickness of the first lens on the optical axis;
the wide-angle optical imaging lens has only the first lens element to the sixth lens element.
Further, the wide-angle optical imaging lens further satisfies the following conditions: nd1>1.8, where nd1 is the refractive index of the first lens.
Furthermore, the wide-angle optical imaging lens further satisfies the following conditions: nd3>1.9, nd4>2.0, where nd3 is the refractive index of the third lens and nd4 is the refractive index of the fourth lens.
Further, the wide-angle optical imaging lens further satisfies the following conditions: vd5-vd4>30, where vd4 is the Abbe number of the fourth lens and vd5 is the Abbe number of the fifth lens.
Further, the wide-angle optical imaging lens further satisfies the following conditions: the object side surface and the image side surface of the second lens and the sixth lens are both 16-order even-order aspheric surfaces.
Further, the wide-angle optical imaging lens further satisfies the following conditions: -5.6mm < (f1/f) < -4.5mm, -3mm < (f2/f) < -2mm, 3mm < (f3/f) <4mm, -3mm < (f4/f) < -2mm, 1.5mm < (f5/f) <2.5mm, 4.5mm < (f6/f) <5.5mm, wherein f is the overall focal length of the wide-angle optical imaging lens, f1 is the focal length of the first lens, f2 is the focal length of the second lens, f3 is the focal length of the third lens, f4 is the focal length of the fourth lens, f5 is the focal length of the fifth lens, and f6 is the focal length of the sixth lens.
Further, the lens further comprises a diaphragm, and the diaphragm is arranged between the third lens and the fourth lens.
Further, the wide-angle optical imaging lens further satisfies the following conditions: TTL <16.98mm, wherein TTL is the distance on the optical axis from the object side surface of the first lens to the imaging surface.
The invention has the beneficial technical effects that:
the invention adopts six lenses, and each lens is correspondingly designed, so that the light transmission is large, and the lens can be used in a low-light environment; the field angle is large and can reach 210 degrees, and the wide-angle application is realized; the resolution ratio is high, and the imaging quality is ensured; the F-Theta distortion is positive distortion, so that edge pixels are distributed more, image compression is reduced, and imaging quality is improved; the temperature drift amount is small, and the use in the temperature range of-40 ℃ to 105 ℃ can be met; good impact resistance.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic structural diagram according to a first embodiment of the present invention;
FIG. 2 is a graph of the MTF of 0.430-0.640 μm in visible light according to the first embodiment of the present invention;
FIG. 3 is a defocus plot of 0.430-0.640 μm visible light in accordance with the first embodiment of the present invention;
FIG. 4 is a diagram illustrating field curvature and distortion curves according to a first embodiment of the present invention;
FIG. 5 is a graph illustrating a relative illuminance curve according to a first embodiment of the present invention;
FIG. 6 is a dot-column diagram according to a first embodiment of the present invention;
FIG. 7 is a schematic structural diagram according to a second embodiment of the present invention;
FIG. 8 is a graph of the MTF of 0.430-0.640 μm in visible light according to the second embodiment of the present invention;
FIG. 9 is a defocus plot of 0.430-0.640 μm visible light in accordance with the second embodiment of the present invention;
FIG. 10 is a graph showing field curvature and distortion curves of a second embodiment of the present invention;
FIG. 11 is a graph illustrating a relative illuminance curve according to a second embodiment of the present invention;
FIG. 12 is a dot-column diagram according to a second embodiment of the present invention;
FIG. 13 is a schematic structural diagram of a third embodiment of the present invention;
FIG. 14 is a graph of MTF of 0.430-0.640 μm in visible light according to example III of the present invention;
FIG. 15 is a defocus graph of 0.430-0.640 μm in visible light according to the third embodiment of the present invention;
FIG. 16 is a graph showing the field curvature and distortion curve of a third embodiment of the present invention;
FIG. 17 is a graph illustrating a relative illuminance curve according to a third embodiment of the present invention;
FIG. 18 is a dot diagram of a third embodiment of the present invention;
FIG. 19 is a schematic structural diagram of a fourth embodiment of the present invention;
FIG. 20 is a graph of the MTF of 0.430-0.640 μm in visible light according to example four of the present invention;
FIG. 21 is a defocus plot of 0.430-0.640 μm in visible light according to example four of the present invention;
FIG. 22 is a graph showing field curvature and distortion curves of a fourth embodiment of the present invention;
FIG. 23 is a graph illustrating a relative illuminance curve according to a fourth embodiment of the present invention;
FIG. 24 is a dot diagram according to a fourth embodiment of the present invention;
FIG. 25 is a schematic structural diagram of a fifth embodiment of the present invention;
FIG. 26 is a graph of the MTF of 0.430-0.640 μm in visible light according to example V of the present invention;
FIG. 27 is a defocus plot of 0.430-0.640 μm in visible light according to example V of the present invention;
FIG. 28 is a graph showing field curvature and distortion curves of example five of the present invention;
fig. 29 is a graph illustrating a relative illuminance curve according to a fifth embodiment of the present invention;
FIG. 30 is a dot-column diagram of the fifth embodiment of the present invention.
Detailed Description
To further illustrate the various embodiments, the invention provides the accompanying drawings. The accompanying drawings, which are incorporated in and constitute a part of this disclosure, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the embodiments. Those skilled in the art will appreciate still other possible embodiments and advantages of the present invention with reference to these figures. Elements in the figures are not drawn to scale and like reference numerals are generally used to indicate like elements.
The invention will now be further described with reference to the accompanying drawings and detailed description.
As used herein, the term "a lens element having a positive refractive index (or a negative refractive index)" means that the paraxial refractive index of the lens element calculated by Gaussian optics is positive (or negative). The term "object-side (or image-side) of a lens" is defined as the specific range of imaging light rays passing through the lens surface. The determination of the surface shape of the lens can be performed by the judgment method of a person skilled in the art, i.e., by the sign of the curvature radius (abbreviated as R value). The R value may be commonly used in optical design software, such as Zemax or CodeV. The R value is also commonly found in lens data sheets (lens data sheets) of optical design software. When the R value is positive, the object side is judged to be a convex surface; and when the R value is negative, judging that the object side surface is a concave surface. On the contrary, regarding the image side surface, when the R value is positive, the image side surface is judged to be a concave surface; when the R value is negative, the image side surface is judged to be convex.
The invention discloses a wide-angle optical imaging lens which sequentially comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a fourth lens from an object side to an image side along an optical axis; the first lens element to the sixth lens element each include an object-side surface facing the object side and passing the image light, and an image-side surface facing the image side and passing the image light.
The first lens element with negative refractive index has a convex object-side surface and a concave image-side surface.
The second lens element with negative refractive index has a concave object-side surface and a concave image-side surface.
The third lens element with positive refractive power has a convex object-side surface and a convex image-side surface.
The fourth lens element with negative refractive index has a convex object-side surface and a concave image-side surface.
The fifth lens element with positive refractive power has a convex object-side surface and a convex image-side surface.
The sixth lens element with positive refractive power has a convex object-side surface and a convex image-side surface.
The second lens and the sixth lens are both plastic aspheric lenses, the first lens, the third lens, the fourth lens and the fifth lens are all glass lenses, and the fourth lens and the fifth lens are mutually glued; the chromatic aberration is optimized, the imaging quality is improved, the temperature drift is optimized, meanwhile, the plastic aspheric surface is uniformly spread, the manufacturing cost is low, the large-scale mass production and use are easy, and the product competitiveness is improved.
The wide-angle optical imaging lens meets the following requirements: D11/T1<11.5, wherein D11 is the clear aperture of the object side surface of the first lens, and T1 is the thickness of the first lens on the optical axis; the aperture of the object side surface of the first lens is ensured to be larger, and meanwhile, the center thickness of the first lens is also larger, so that the field angle is increased, the shock resistance is improved, and the lens is particularly suitable for a vehicle-mounted all-round lens.
The wide-angle optical imaging lens has only the first lens element to the sixth lens element. The invention adopts six lenses (4 glass lenses and 2 plastic aspheric lenses), and by correspondingly designing each lens, the light transmission is large, the relative illumination is high, and the lens can be used in a low-illumination environment; the field angle is large and can reach 210 degrees, and the wide angle is applicable, so that the wide-angle requirement of the vehicle-mounted all-round lens is met; the resolution ratio is high, and the imaging quality is ensured; the F-Theta distortion is positive distortion, so that edge pixels are distributed more, image compression is reduced, and imaging quality is improved; the temperature drift amount is small, and the use in the temperature range of-40 ℃ to 105 ℃ can be met; good shock resistance and is particularly suitable for vehicle-mounted use environments.
Preferably, the wide-angle optical imaging lens further satisfies the following conditions: nd1>1.8, wherein nd1 is the refractive index of the first lens, which is beneficial to integrating the visual field and miniaturizing the lens.
More preferably, the wide-angle optical imaging lens further satisfies: nd3>1.9, nd4>2.0, wherein nd3 is the refractive index of the third lens, and nd4 is the refractive index of the fourth lens, so that the optical structure can be optimized well, the design of the lens structure is facilitated, and the cost of the lens is reduced.
Preferably, the wide-angle optical imaging lens further satisfies the following conditions: vd5-vd4>30, wherein vd4 is the abbe number of the fourth lens, and vd5 is the abbe number of the fifth lens, which is beneficial to correcting chromatic aberration.
Preferably, the wide-angle optical imaging lens further satisfies the following conditions: the object side surface and the image side surface of the second lens and the sixth lens are both 16-order even-order aspheric surfaces, which is beneficial to correcting second-order spectrum and high-order aberration, better eliminates blue-violet edge chromatic aberration, and improves image quality.
Preferably, the wide-angle optical imaging lens further satisfies the following conditions: -5.6mm < (f1/f) < -4.5mm, -3mm < (f2/f) < -2mm, 3mm < (f3/f) <4mm, -3mm < (f4/f) < -2mm, 1.5mm < (f5/f) <2.5mm, 4.5mm < (f6/f) <5.5mm, wherein f is the overall focal length of the wide-angle optical imaging lens, f1 is the focal length of the first lens, f2 is the focal length of the second lens, f3 is the focal length of the third lens, f4 is the focal length of the fourth lens, f5 is the focal length of the fifth lens, and f6 is the focal length of the sixth lens, and further, the optical powers are reasonably allocated, which is beneficial to improving the performance of the optical system.
Preferably, the lens further comprises a diaphragm, and the diaphragm is arranged between the third lens and the fourth lens, so that the overall performance is further improved.
Preferably, the wide-angle optical imaging lens further satisfies the following conditions: TTL <16.98mm, wherein TTL is the distance on the optical axis from the object side surface of the first lens to the imaging surface, and the lens is more compact in structure and suitable for being used on a vehicle.
The wide-angle optical imaging lens of the present invention will be described in detail with specific embodiments.
Example one
As shown in fig. 1, a wide-angle optical imaging lens includes, in order along an optical axis I, a first lens 1, a second lens 2, a third lens 3, a stop 7, a fourth lens 4, a fifth lens 5, a sixth lens 6, a protective glass 8, and an image plane 9 from an object side a1 to an image side a 2; the first lens element 1 to the sixth lens element 6 each include an object-side surface facing the object side a1 and passing the imaging light rays, and an image-side surface facing the image side a2 and passing the imaging light rays.
The first lens element 1 has a negative refractive index, and an object-side surface 11 of the first lens element 1 is convex and an image-side surface 12 of the first lens element 1 is concave.
The second lens element 2 has a negative refractive index, and an object-side surface 21 of the second lens element 2 is concave and an image-side surface 22 of the second lens element 2 is concave.
The third lens element 3 has a positive refractive index, and an object-side surface 31 of the third lens element 3 is convex and an image-side surface 32 of the third lens element 3 is convex.
The fourth lens element 4 has a negative refractive index, and an object-side surface 41 of the fourth lens element 4 is convex and an image-side surface 42 of the fourth lens element 4 is concave.
The fifth lens element 5 has a positive refractive index, and an object-side surface 51 of the fifth lens element 5 is convex and an image-side surface 52 of the fifth lens element 5 is convex.
The sixth lens element 6 has a positive refractive index, and an object-side surface 61 of the sixth lens element 6 is convex and an image-side surface 62 of the sixth lens element 6 is convex.
The second lens 2 and the sixth lens 6 are both plastic aspheric lenses, and the first lens 1, the third lens 3, the fourth lens 4 and the fifth lens 5 are all glass spherical lenses.
The fourth lens 4 and the fifth lens 5 are cemented to each other.
In other embodiments, the diaphragm 7 may also be arranged between other lenses.
The detailed optical data of this embodiment are shown in Table 1-1.
Table 1-1 detailed optical data for example one
In this embodiment, the object- side surfaces 21, 61 and the image- side surfaces 22, 62 are defined according to the following aspheric curve formula:
wherein:
r is the distance from a point on the optical surface to the optical axis.
z is the rise of this point in the direction of the optical axis.
c is the curvature of the surface.
k is the conic constant of the surface.
A4、A6、A8、A10、A12、A14、A16Respectively as follows: aspheric coefficients of fourth order, sixth order, eighth order, tenth order, twelfth order, fourteenth order and sixteenth order.
For details of parameters of each aspheric surface, please refer to the following table:
| surface of | k | A4 | A6 | A8 | A10 | A12 | A14 | A16 |
| 21 | -150.80 | 2.109E-02 | -5.370E-03 | 7.896E-04 | -6.951E-05 | 2.945E-06 | -6.091E-09 | -2.573E-09 |
| 22 | -0.21 | 6.272E-02 | -2.429E-02 | 5.569E-03 | -7.306E-04 | -1.370E-04 | 5.816E-05 | -6.064E-06 |
| 61 | 4.41 | -7.938E-03 | 2.014E-03 | -1.104E-03 | 5.755E-04 | -1.282E-04 | 2.502E-05 | -2.339E-06 |
| 62 | -0.61 | 2.021E-03 | -3.753E-03 | 2.423E-03 | -8.507E-04 | 1.827E-04 | -1.938E-05 | 1.660E-06 |
Please refer to table 6 for the values of the conditional expressions related to this embodiment.
The MTF transfer function graph of the embodiment is detailed as shown in FIG. 2, the defocusing graph is detailed as shown in FIG. 3, the point sequence graph is detailed as shown in FIG. 6, and it can be seen that the resolution is high, the resolution supports 4M, and the imaging quality is excellent; referring to (a) and (B) of fig. 4, it can be seen that the field curvature is small, the distortion reaches more than positive 18%, the image edge compression amount is small, the pixel values of the edge unit angle distribution are more, the imaging quality of the edge is improved, and the relative illumination is higher as seen in detail in fig. 5 with respect to the contrast curve.
The specific embodiment has small temperature drift, can meet the use requirement under the temperature condition of minus 40 ℃ to 105 ℃, keeps the definition of the picture unchanged, and is particularly suitable for the vehicle-mounted environment.
In this embodiment, the focal length f of the optical imaging lens is 1.1 mm; f-number FNO 1.8; field angle FOV is 210 °; the image plane size is 5.2mm, and the distance TTL between the object side surface 11 of the first lens element 1 and the imaging surface 9 on the optical axis I is 16.85 mm.
Example two
As shown in fig. 7, the lens elements of this embodiment have the same surface roughness and refractive index as those of the first embodiment, and only the optical parameters such as the curvature radius of the surface of each lens element and the lens thickness are different.
The detailed optical data of this embodiment is shown in Table 2-1.
TABLE 2-1 detailed optical data for example two
For the detailed data of the parameters of each aspheric surface of this embodiment, refer to the following table:
| surface of | k | A4 | A6 | A8 | A10 | A12 | A14 | A16 |
| 21 | -215.99 | 2.163E-02 | -5.448E-03 | 7.902E-04 | -6.934E-05 | 2.985E-06 | -1.198E-08 | -2.369E-09 |
| 22 | -0.27 | 6.154E-02 | -2.367E-02 | 5.251E-03 | -7.389E-04 | -1.294E-04 | 5.970E-05 | -6.522E-06 |
| 61 | -0.54 | -8.780E-03 | 2.416E-03 | -1.148E-03 | 5.588E-04 | -1.280E-04 | 2.764E-05 | -2.748E-06 |
| 62 | -0.62 | 1.412E-03 | -3.406E-03 | 2.292E-03 | -8.048E-04 | 1.719E-04 | -1.875E-05 | 1.763E-06 |
Please refer to table 6 for the values of the conditional expressions related to this embodiment.
The MTF transfer function graph of the embodiment is detailed in fig. 8, the defocus graph is detailed in fig. 9, the point sequence graph is detailed in fig. 12, and it can be seen that the resolution is high, the resolution supports 4M, and the imaging quality is excellent; referring to (a) and (B) of fig. 10, it can be seen that the field curvature is small, the distortion reaches more than positive 18%, the image edge compression amount is small, the pixel values of the edge unit angle distribution are more, the imaging quality of the edge is improved, and the relative illumination is higher as seen in detail in fig. 11 with respect to the contrast curve.
The specific embodiment has small temperature drift, can meet the use requirement under the temperature condition of minus 40 ℃ to 105 ℃, keeps the definition of the picture unchanged, and is particularly suitable for the vehicle-mounted environment.
In this embodiment, the focal length f of the optical imaging lens is 1.1 mm; f-number FNO 1.8; field angle FOV is 210 °; the image plane size is 5.2mm, and the distance TTL between the object side surface 11 of the first lens element 1 and the imaging surface 9 on the optical axis I is 16.77 mm.
EXAMPLE III
As shown in fig. 13, the lens elements of this embodiment have the same surface roughness and refractive index as those of the first embodiment, and only the optical parameters such as the curvature radius and the lens thickness of the surface of each lens element are different.
The detailed optical data of this embodiment is shown in Table 3-1.
TABLE 3-1 detailed optical data for EXAMPLE III
For the detailed data of the parameters of each aspheric surface of this embodiment, refer to the following table:
| surface of | k | A4 | A6 | A8 | A10 | A12 | A14 | A16 |
| 21 | -328.93 | 2.263E-02 | -5.640E-03 | 8.095E-04 | -7.104E-05 | 3.070E-06 | -1.136E-08 | -2.533E-09 |
| 22 | -0.32 | 6.325E-02 | -2.432E-02 | 5.048E-03 | -7.287E-04 | -1.267E-04 | 6.033E-05 | -6.878E-06 |
| 61 | -3.27 | -9.232E-03 | 2.738E-03 | -1.160E-03 | 5.728E-04 | -1.252E-04 | 2.512E-05 | -2.434E-06 |
| 62 | -0.75 | 1.971E-03 | -3.328E-03 | 2.272E-03 | -7.817E-04 | 1.705E-04 | -2.000E-05 | 2.056E-06 |
Please refer to table 6 for the values of the conditional expressions related to this embodiment.
The MTF transfer function graph of the embodiment is detailed in fig. 14, the defocus graph is detailed in fig. 15, the point sequence graph is detailed in fig. 18, and it can be seen that the resolution is high, the resolution supports 4M, and the imaging quality is excellent; referring to fig. 16 (a) and (B), it can be seen that the field curvature is small, the distortion reaches more than positive 18%, the image edge compression amount is small, the pixel values of the edge unit angle distribution are more, the imaging quality of the edge is improved, and the relative illumination is higher as seen in fig. 17 in comparison with the contrast curve.
The specific embodiment has small temperature drift, can meet the use requirement under the temperature condition of minus 40 ℃ to 105 ℃, keeps the definition of the picture unchanged, and is particularly suitable for the vehicle-mounted environment.
In this embodiment, the focal length f of the optical imaging lens is 1.1 mm; f-number FNO 1.8; field angle FOV is 210 °; the image plane size is 5.2mm, and the distance TTL between the object side surface 11 of the first lens element 1 and the imaging surface 9 on the optical axis I is 16.64 mm.
Example four
As shown in fig. 19, the lens elements of this embodiment have the same surface roughness and refractive index as those of the first embodiment, and only the optical parameters such as the curvature radius of the surface of each lens element and the lens thickness are different.
The detailed optical data of this embodiment is shown in Table 4-1.
TABLE 4-1 detailed optical data for example four
For the detailed data of the parameters of each aspheric surface of this embodiment, refer to the following table:
| surface of | k | A4 | A6 | A8 | A10 | A12 | A14 | A16 |
| 21 | -325.62 | 2.379E-02 | -5.669E-03 | 8.094E-04 | -7.104E-05 | 3.061E-06 | -1.233E-08 | -2.402E-09 |
| 22 | -0.34 | 6.435E-02 | -2.379E-02 | 5.107E-03 | -7.386E-04 | -1.301E-04 | 6.078E-05 | -6.555E-06 |
| 61 | -9.60 | -9.469E-03 | 2.521E-03 | -1.221E-03 | 5.683E-04 | -1.240E-04 | 2.528E-05 | -2.478E-06 |
| 62 | -0.82 | 2.466E-03 | -3.848E-03 | 2.267E-03 | -7.752E-04 | 1.693E-04 | -2.075E-05 | 1.916E-06 |
Please refer to table 6 for the values of the conditional expressions related to this embodiment.
The MTF transfer function graph of the embodiment is detailed in fig. 20, the defocus graph is detailed in fig. 21, the point sequence graph is detailed in fig. 24, and it can be seen that the resolution is high, the resolution supports 4M, and the imaging quality is excellent; referring to (a) and (B) of fig. 22, it can be seen that the field curvature is small, the distortion reaches more than positive 18%, the image edge compression amount is small, the pixel values of the edge unit angle distribution are more, the imaging quality of the edge is improved, and the relative illumination is higher as seen in detail in fig. 23 with respect to the contrast curve.
The specific embodiment has small temperature drift, can meet the use requirement under the temperature condition of minus 40 ℃ to 105 ℃, keeps the definition of the picture unchanged, and is particularly suitable for the vehicle-mounted environment.
In this embodiment, the focal length f of the optical imaging lens is 1.1 mm; f-number FNO 1.8; field angle FOV is 210 °; the image plane size is 5.2mm, and the distance TTL between the object side surface 11 of the first lens element 1 and the imaging surface 9 on the optical axis I is 16.97 mm.
EXAMPLE five
As shown in fig. 25, the lens elements of this embodiment have the same surface roughness and refractive index as those of the first embodiment, and only the optical parameters such as the curvature radius and the lens thickness of the surface of each lens element are different.
The detailed optical data of this embodiment is shown in Table 5-1.
TABLE 5-1 detailed optical data for EXAMPLE V
For the detailed data of the parameters of each aspheric surface of this embodiment, refer to the following table:
| surface of | k | A4 | A6 | A8 | A10 | A12 | A14 | A16 |
| 21 | -415.70 | 2.547E-02 | -5.588E-03 | 7.732E-04 | -6.707E-05 | 2.934E-06 | -2.119E-08 | -1.858E-09 |
| 22 | -0.27 | 6.391E-02 | -2.140E-02 | 4.927E-03 | -7.594E-04 | -1.363E-04 | 6.196E-05 | -6.707E-06 |
| 61 | 37.00 | -8.905E-03 | 1.163E-03 | -1.139E-03 | 5.765E-04 | -1.217E-04 | 2.406E-05 | -2.317E-06 |
| 62 | -1.10 | 3.154E-03 | -4.749E-03 | 2.327E-03 | -7.738E-04 | 1.697E-04 | -2.200E-05 | 1.960E-06 |
Please refer to table 6 for the values of the conditional expressions related to this embodiment.
The MTF transfer function graph of the embodiment is detailed in fig. 26, the defocus graph is detailed in fig. 27, the point sequence graph is detailed in fig. 30, and it can be seen that the resolution is high, the resolution supports 4M, and the imaging quality is excellent; referring to (a) and (B) of fig. 28, it can be seen that the field curvature is small, the distortion reaches more than positive 18%, the image edge compression amount is small, the pixel values of the edge unit angle distribution are more, the imaging quality of the edge is improved, and the relative illumination is higher as seen in a detailed graph of fig. 29 with respect to the contrast curve.
The specific embodiment has small temperature drift, can meet the use requirement under the temperature condition of minus 40 ℃ to 105 ℃, keeps the definition of the picture unchanged, and is particularly suitable for the vehicle-mounted environment.
In this embodiment, the focal length f of the optical imaging lens is 1.1 mm; f-number FNO 1.8; field angle FOV is 210 °; the image plane size is 5.2mm, and the distance TTL between the object side surface 11 of the first lens element 1 and the imaging surface 9 on the optical axis I is 16.96 mm.
TABLE 6 values of relevant important parameters for five embodiments of the invention
While the invention has been particularly shown and described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (8)
1. A wide-angle optical imaging lens, characterized in that: the lens comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens in sequence from the object side to the image side along an optical axis; the first lens, the second lens, the third lens and the fourth lens are respectively arranged on the object side and the image side, and the object side faces towards the object side and enables the imaging light rays to pass through;
the first lens element with negative refractive index has a convex object-side surface and a concave image-side surface;
the second lens element with negative refractive index has a concave object-side surface and a concave image-side surface;
the third lens element with positive refractive index has a convex object-side surface and a convex image-side surface;
the fourth lens element with negative refractive index has a convex object-side surface and a concave image-side surface;
the fifth lens element with positive refractive index has a convex object-side surface and a convex image-side surface;
the sixth lens element with positive refractive index has a convex object-side surface and a convex image-side surface;
the second lens and the sixth lens are both plastic aspheric lenses, the first lens, the third lens, the fourth lens and the fifth lens are all glass lenses, and the fourth lens and the fifth lens are mutually glued;
the wide-angle optical imaging lens meets the following requirements: D11/T1<11.5, wherein D11 is the clear aperture of the object side surface of the first lens, and T1 is the thickness of the first lens on the optical axis;
the wide-angle optical imaging lens has only the first lens element to the sixth lens element.
2. The wide-angle optical imaging lens of claim 1, further satisfying: nd1>1.8, where nd1 is the refractive index of the first lens.
3. The wide-angle optical imaging lens of claim 2, further satisfying: nd3>1.9, nd4>2.0, where nd3 is the refractive index of the third lens and nd4 is the refractive index of the fourth lens.
4. The wide-angle optical imaging lens of claim 1, further satisfying: vd5-vd4>30, where vd4 is the Abbe number of the fourth lens and vd5 is the Abbe number of the fifth lens.
5. The wide-angle optical imaging lens of claim 1, further satisfying: the object side surface and the image side surface of the second lens and the sixth lens are both 16-order even-order aspheric surfaces.
6. The wide-angle optical imaging lens of claim 1, further satisfying: -5.6mm < (f1/f) < -4.5mm, -3mm < (f2/f) < -2mm, 3mm < (f3/f) <4mm, -3mm < (f4/f) < -2mm, 1.5mm < (f5/f) <2.5mm, 4.5mm < (f6/f) <5.5mm, wherein f is the overall focal length of the wide-angle optical imaging lens, f1 is the focal length of the first lens, f2 is the focal length of the second lens, f3 is the focal length of the third lens, f4 is the focal length of the fourth lens, f5 is the focal length of the fifth lens, and f6 is the focal length of the sixth lens.
7. The wide-angle optical imaging lens of claim 1, further comprising a stop disposed between the third lens and the fourth lens.
8. The wide-angle optical imaging lens of claim 1, further satisfying: TTL <16.98mm, wherein TTL is the distance on the optical axis from the object side surface of the first lens to the imaging surface.
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| CN113238343A (en) * | 2021-05-21 | 2021-08-10 | 天津欧菲光电有限公司 | Optical system, image capturing module, electronic equipment and carrier |
| CN113946033A (en) * | 2021-09-28 | 2022-01-18 | 江西凤凰光学科技有限公司 | High-resolution wide-angle vehicle-mounted laser radar lens |
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