CN111367049A - Wide-angle large-light-transmission optical imaging lens - Google Patents
Wide-angle large-light-transmission optical imaging lens Download PDFInfo
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- G—PHYSICS
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- 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
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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
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0055—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element
- G02B13/006—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element at least one element being a compound optical element, e.g. cemented elements
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- G—PHYSICS
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Abstract
The invention relates to the technical field of lenses. The invention discloses a wide-angle large-light-transmission optical imaging lens which sequentially comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens from an object side to an image side along an optical axis; the first lens and the second lens are both convex-concave lenses with negative refractive index; the third lens and the sixth lens are convex lenses with positive refraction; the fourth lens element with positive refractive index and convex image-side surface; the fifth lens is a concave-convex lens with negative refractive index; the second lens and the sixth lens are both plastic aspheric lenses, and the first lens, the third lens, the fourth lens and the fifth lens are all made of glass materials; two lenses of the first lens to the sixth lens are cemented with each other. The invention has the advantages of large light transmission and good low-light characteristic; wide angle; the depth of field is large; the blue-violet side is optimized well, and the image color reducibility is high; small volume and low cost.
Description
Technical Field
The invention belongs to the technical field of lenses, and particularly relates to a wide-angle large-light-transmission optical imaging lens applied to vehicle monitoring.
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, vehicle-mounted monitoring, security monitoring, unmanned aerial vehicle aerial photography and the like, so that the requirements on the optical imaging lenses are higher and higher.
However, the existing optical imaging lens applied to vehicle-mounted monitoring has many defects, such as small light transmission, poor low-light property, and difficulty in realizing clear color images under the condition of poor light; the field angle is small, and the shot picture area is insufficient; the depth of field is small, the resolution of different object distances is low, the image sharpness is poor, and the image is not uniform; the total optical length is too long, the lens is large in size, the use is influenced, and the cost is high; the blue-violet phenomenon is severe, affecting the image quality, etc., and thus, it is necessary to improve it to meet the increasing demands of consumers.
Disclosure of Invention
The present invention is directed to an optical imaging lens with wide angle and large light transmission to solve the above-mentioned problems.
In order to achieve the purpose, the invention adopts the technical scheme that: a wide-angle large-light-transmission 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 convex 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 positive refractive index has a convex image-side surface;
the fifth lens element with negative refractive index has a concave 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, and the first lens, the third lens, the fourth lens and the fifth lens are all made of glass materials; two lenses of the first lens to the sixth lens are mutually glued;
the optical imaging lens has only the first lens element to the sixth lens element with refractive index.
Further, the fourth lens and the fifth lens are cemented with each other.
Further, the optical imaging lens further satisfies: vd4-vd5>30, where vd4 and vd5 are the abbe numbers of the fourth lens and the fifth lens, respectively.
Further, the object side surface of the fourth lens is a plane.
Further, the lens further comprises a diaphragm, and the diaphragm is arranged between the third lens and the fourth lens.
Further, the second lens and the sixth lens are both 14-order even-order aspheric surfaces.
Further, the optical imaging lens further satisfies: nd3>1.85, where nd3 is the refractive index of the third lens.
Further, the optical imaging lens further satisfies: nd5>1.85, where nd5 is the refractive index of the fifth lens.
Further, the optical imaging lens further satisfies: TTL <16.5mm, 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 by correspondingly designing each lens, the invention has the advantages of large light transmission, good low-illumination characteristic, and can realize clear color images under the condition of poor light; the field angle is large, and the whole in-vehicle picture can be perfectly covered; the depth of field is large, and the overall imaging quality is improved; the glass-plastic mixed design is adopted, the total length is short, the whole volume is small, the cost is low, and the cost performance is high; the blue-violet side is optimized well, and the image color reducibility is high.
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 an MTF graph of visible light 470-650nm at an object distance of 700mm according to the first embodiment of the present invention;
FIG. 3 is a defocus graph of 470-650nm in visible light according to the first embodiment of the present invention;
FIG. 4 is an MTF graph of visible light 470-650nm at an object distance of 400mm according to a first embodiment of the present invention;
FIG. 5 is a schematic diagram of lateral chromatic aberration according to a first embodiment of the present invention;
FIG. 6 is a diagram illustrating longitudinal aberrations according to a first embodiment of the present invention;
FIG. 7 is a schematic diagram of a chromatic aberration focus-shift curve according to a first embodiment of the present invention;
FIG. 8 is a schematic structural diagram according to a second embodiment of the present invention;
FIG. 9 is an MTF graph of visible light 470-650nm at 700mm object distance in accordance with the second embodiment of the present invention;
FIG. 10 is a defocus graph of 470-650nm in visible light according to the second embodiment of the present invention;
FIG. 11 is a graph of MTF of visible light 470-650nm at an object distance of 400mm in accordance with the second embodiment of the present invention;
FIG. 12 is a schematic diagram of lateral chromatic aberration of a second embodiment of the present invention;
FIG. 13 is a schematic diagram of longitudinal aberration of the second embodiment of the present invention;
FIG. 14 is a schematic diagram of a chromatic aberration focus-shift curve according to a second embodiment of the present invention;
FIG. 15 is a schematic structural diagram of a third embodiment of the present invention;
FIG. 16 is the MTF graph of visible light 470-650nm at 700mm object distance in accordance with the third embodiment of the present invention;
FIG. 17 is a defocus plot of 470-650nm in visible light in the third embodiment of the present invention;
FIG. 18 is the MTF graph of visible light 470-650nm at 400mm object distance in accordance with the third embodiment of the present invention;
FIG. 19 is a schematic diagram of lateral chromatic aberration of a third embodiment of the present invention;
FIG. 20 is a schematic diagram of longitudinal aberration of the third embodiment of the present invention;
FIG. 21 is a schematic diagram of a chromatic aberration focus-shift curve according to a third embodiment of the present invention;
FIG. 22 is a schematic structural diagram according to a fourth embodiment of the present invention;
FIG. 23 is an MTF graph of visible light 470-650nm at 700mm object distance according to the fourth embodiment of the present invention;
FIG. 24 is a graph of 470-650nm defocus for visible light in the fourth embodiment of the present invention;
FIG. 25 is the MTF graph of visible light 470-650nm at 400mm object distance according to example four of the present invention;
FIG. 26 is a schematic diagram of lateral chromatic aberration of a fourth embodiment of the present invention;
FIG. 27 is a schematic diagram of longitudinal aberration diagrams according to the fourth embodiment of the present invention;
fig. 28 is a schematic diagram of a chromatic aberration focal shift curve according to a fourth 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.
The term "a lens element having positive refractive index (or negative refractive index)" means that the paraxial refractive index of the lens element calculated by Gaussian optics theory 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 large-light-transmission optical imaging lens which sequentially comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth 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 convex 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 positive refractive power has a convex image-side surface.
The fifth lens element with negative refractive index has a concave 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, and the first lens, the third lens, the fourth lens and the fifth lens are all made of glass materials; two lenses of the first lens to the sixth lens are mutually glued; the optical imaging lens has only the first lens element to the sixth lens element with refractive index.
The six lenses are adopted, and the lenses are correspondingly designed, so that the high-brightness low-illumination-level imaging device has high light transmission and good low-illumination characteristics, can realize clear color images under the condition of poor light, is suitable for the low-illumination condition in a vehicle, and improves the integral imaging brightness; the field angle is large, the whole picture in the vehicle can be perfectly covered, and the practicability is improved; the depth of field is large, the device is suitable for the depth of field range of 0.4-1m, the interior of the whole vehicle body is basically covered, and the whole imaging quality is improved; the glass-plastic mixed design is adopted, the total length is short, the whole volume is small, the glass-plastic mixed automobile is suitable for being used in a small environment in an automobile, the cost is low, and the cost performance is high; the blue-violet side is optimized well, and the image color reducibility is high.
Preferably, the fourth lens and the fifth lens are mutually glued to further correct chromatic aberration.
More preferably, the optical imaging lens further satisfies: vd4-vd5>30, where vd4 and vd5 are the abbe numbers of the fourth lens and the fifth lens, respectively, to further correct chromatic aberration.
Preferably, the object side surface of the fourth lens is a plane, so that the fourth lens is easy to manufacture, the processing yield is improved, and the cost is reduced.
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 second lens and the sixth lens are both 14-order even-order aspheric surfaces, which are favorable for correcting second-order spectrum and high-order aberration.
Preferably, the optical imaging lens further satisfies: nd3>1.85, wherein nd3 is the refractive index of the third lens, and the optical structure can be optimized better.
Preferably, the optical imaging lens further satisfies: nd5>1.85, wherein nd5 is the refractive index of the fifth lens, and the optical structure can be optimized better.
Preferably, the optical imaging lens further satisfies: TTL is less than 16.5mm, wherein TTL is the distance between the object side surface of the first lens and the imaging surface on the optical axis, and the total length of the optical imaging lens is further shortened.
The optical imaging lens of the present invention will be described in detail below with specific embodiments.
Example one
As shown in fig. 1, an 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, an optical filter 8, a protective sheet 9, and an image plane 10 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, the object-side surface 21 of the second lens element 2 is a convex surface, the image-side surface 22 of the second lens element 2 is a concave surface, and both the object-side surface 21 and the image-side surface 22 of the second lens element 2 are aspheric.
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 positive refractive index, and the object-side surface 41 of the fourth lens element 4 is a flat surface, but in other embodiments, the object-side surface 41 of the fourth lens element 4 may have other surface types such as a convex surface, and the image-side surface 42 of the fourth lens element 4 is a convex surface.
The fifth lens element 5 has a negative refractive index, and an object-side surface 51 of the fifth lens element 5 is concave and an image-side surface 52 of the fifth lens element 5 is convex.
The sixth lens element 6 has a positive refractive index, an object-side surface 61 of the sixth lens element 6 is convex, an image-side surface 62 of the sixth lens element 6 is convex, and both the object-side surface 61 and the image-side surface 62 of the sixth lens element 6 are aspheric.
The second lens 2 and the sixth lens 6 are made of plastic materials, and the first lens 1, the third lens 3, the fourth lens 4 and the fifth lens 5 are made of glass materials.
In this embodiment, the fourth lens 4 and the fifth lens 5 are cemented to each other. Of course, in other embodiments, any other two lenses may be cemented to each other.
In this embodiment, the optical filter 8 may be an infrared filter, and is specifically selected according to actual needs.
Of course, in other embodiments, the diaphragm 7 may be disposed at other suitable positions.
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 surface 21, the object-side surface 61, the image-side surface 22 and the image-side surface 62 are defined by the following aspheric curve formulas:
wherein:
z: depth of the aspheric surface (the vertical distance between a point on the aspheric surface that is y from the optical axis and a tangent plane tangent to the vertex on the optical axis of the aspheric surface);
c: curvature of aspheric vertex (the vertex curvature);
k: cone coefficient (Conic Constant);
rn: normalized radius (normalysis radius (NRADIUS));
u：r/rn；
am: mth order QconCoefficient (is the m)thQconcoefficient)；
Qm con: mth order QconPolynomial (the m)thQconpolynomial)；
For details of parameters of each aspheric surface, please refer to the following table:
the MTF graph of the specific embodiment is shown in detail in FIGS. 2 and 4, and the details show that the MTF graph has high resolution, good imaging quality and large depth of field and is suitable for the depth of field range of 0.4-1 m; referring to fig. 3 for a defocus graph, fig. 5 for a transverse chromatic aberration graph, fig. 6 for a longitudinal chromatic aberration graph, and fig. 7 for a chromatic aberration focal shift graph, it can be seen that the chromatic aberration is small, the blue-violet optimization is excellent, and the chromatic reproducibility is high in this embodiment.
In this embodiment, the focal length f of the optical imaging lens is 4.08 mm; the f-number FNO is 2.0; the diagonal field DFOV is 109 °; the distance TTL between the object-side surface 11 of the first lens element 1 and the image plane 10 on the optical axis I is 16.20 mm.
Example two
As shown in fig. 8, 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 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:
the MTF graph of the present embodiment is shown in fig. 9 and 11 in detail, and it can be seen that the resolution is high, the imaging quality is good, the depth of field is large, and the MTF graph is suitable for the depth of field range of 0.4-1 m; referring to fig. 10 for a defocus graph, fig. 12 for a transverse chromatic aberration graph, fig. 13 for a longitudinal chromatic aberration graph, and fig. 14 for a chromatic aberration focal shift graph, it can be seen that the chromatic aberration is small, the blue-violet optimization is excellent, and the chromatic reproducibility is high in this embodiment.
In this embodiment, the focal length f of the optical imaging lens is 4.08 mm; the f-number FNO is 2.0; the diagonal field DFOV is 109 °; the distance TTL between the object-side surface 11 of the first lens element 1 and the image plane 10 on the optical axis I is 16.15 mm.
EXAMPLE III
As shown in fig. 15, 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:
the MTF graph of the present embodiment is shown in fig. 16 and 18 in detail, and it can be seen that the resolution is high, the imaging quality is good, the depth of field is large, and the MTF graph is suitable for the depth of field range of 0.4-1 m; referring to fig. 17 for a defocus graph, fig. 19 for a transverse chromatic aberration graph, fig. 20 for a longitudinal chromatic aberration graph, and fig. 21 for a chromatic aberration focal shift graph, it can be seen that the chromatic aberration of the present embodiment is small, the chromatic aberration is small, the blue-violet optimization is excellent, and the color reducibility is high.
In this embodiment, the focal length f of the optical imaging lens is 4.07 mm; the f-number FNO is 2.0; the diagonal field DFOV is 109 °; the distance TTL between the object-side surface 11 of the first lens element 1 and the image plane 10 on the optical axis I is 16.16 mm.
Example four
As shown in fig. 22, 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 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:
the MTF graph of the present embodiment is shown in fig. 23 and 25 in detail, and it can be seen that the resolution is high, the imaging quality is good, the depth of field is large, and the MTF graph is suitable for the depth of field range of 0.4-1 m; referring to fig. 24 for a defocus graph, fig. 26 for a transverse chromatic aberration graph, fig. 27 for a longitudinal chromatic aberration graph, and fig. 28 for a chromatic aberration focal shift graph, it can be seen that the chromatic aberration of the present embodiment is small, the chromatic aberration is small, the blue-violet optimization is excellent, and the color reducibility is high.
In this embodiment, the focal length f of the optical imaging lens is 4.02 mm; the f-number FNO is 2.0; the diagonal field DFOV is 109.5 °; the distance TTL between the object side surface 11 of the first lens element 1 and the image forming surface 10 on the optical axis I is 16.27 mm.
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 (9)
1. The utility model provides an optical imaging lens who leads to light greatly of wide angle which 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 convex 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 positive refractive index has a convex image-side surface;
the fifth lens element with negative refractive index has a concave 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, and the first lens, the third lens, the fourth lens and the fifth lens are all made of glass materials; two lenses of the first lens to the sixth lens are mutually glued;
the optical imaging lens has only the first lens element to the sixth lens element with refractive index.
2. The wide-angle large-pass optical imaging lens according to claim 1, characterized in that: the fourth lens and the fifth lens are mutually glued.
3. The wide-angle large-light-transmission optical imaging lens according to claim 2, further satisfies the following conditions: vd4-vd5>30, where vd4 and vd5 are the abbe numbers of the fourth lens and the fifth lens, respectively.
4. The wide-angle large-pass optical imaging lens according to claim 1, characterized in that: the object side surface of the fourth lens is a plane.
5. The wide-angle large-pass optical imaging lens according to claim 1, characterized in that: the diaphragm is arranged between the third lens and the fourth lens.
6. The wide-angle large-pass optical imaging lens according to claim 1, characterized in that: the second lens and the sixth lens are both 14-order even-order aspheric surfaces.
7. The wide-angle large-light-transmission optical imaging lens according to claim 1, further satisfies the following conditions: nd3>1.85, where nd3 is the refractive index of the third lens.
8. The wide-angle large-light-transmission optical imaging lens according to claim 1, further satisfies the following conditions: nd5>1.85, where nd5 is the refractive index of the fifth lens.
9. The wide-angle large-light-transmission optical imaging lens according to claim 1, further satisfies the following conditions: TTL <16.5mm, 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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| CN111999860A (en) * | 2020-09-04 | 2020-11-27 | 厦门力鼎光电股份有限公司 | Wide-angle imaging lens for video transmission |
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| CN101122672A (en) * | 2006-08-10 | 2008-02-13 | 梅克拉-朗两合公司 | Wide-angle objective lens system and camera |
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