CN104297904B - Large-aperture ultra wide angle lens - Google Patents
Large-aperture ultra wide angle lens Download PDFInfo
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- CN104297904B CN104297904B CN201410486880.8A CN201410486880A CN104297904B CN 104297904 B CN104297904 B CN 104297904B CN 201410486880 A CN201410486880 A CN 201410486880A CN 104297904 B CN104297904 B CN 104297904B
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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
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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
- G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B9/00—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or -
- G02B9/62—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or - having six components only
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Abstract
The invention provides a large-aperture ultra wide angle lens. The large-aperture ultra wide angle lens comprises a front set, a lens screen and a rear set. Particularly, a first negative lens, a second negative lens, a third positive lens, a fourth positive lens, a fifth negative lens and the sixth positive lens are included in the light incident direction; the front set is composed of the first negative lens, the second negative lens and the third positive lens; the rear set is composed of the fourth positive lens, the fifth negative lens and the sixth positive lens. The number F of the large-aperture ultra wide angle lens reaches 1.6, the large-aperture ultra wide angle lens has the large aperture, more light can be controlled to enter the lens, and the use requirement under the dark environment can be met. Meanwhile, the lens has the ultra wide angle, and meets the imaging requirement with the maximum field angle of 150 degrees. In addition, the six lenses are simple in assembling structure according to the reasonable arrangement among elements, and the large-aperture ultra wide angle lens is simple in structure, excellent in performance, good in tolerance, easy to manufacture and cheap.
Description
Technical field
The present invention relates to optical lens design field, more particularly to a kind of large aperture bugeye lens.
Background technology
It is well known that the diameter of the focal length/lens aperture of lens aperture F values=camera lens, therefore for the mirror of identical focal length
For head, the F values of aperture are less, characterize the visible ray large aperture imaging that the relative diaphragm diameter of camera lens is bigger, commonly uses at present
The aperture of system is F2.0, and what is had can accomplish F1.8, but when in some dark environment, needs to control more light to enter
Enter camera lens.
Additionally, the size of the angle of visual field determines the field range of optical instrument, the angle of visual field is bigger, and the visual field is bigger, optics
Multiplying power is less, it becomes possible to which the object that more advantageously will find a view is taken in in visual field.With the progress of technology, the consumption of class is imaged
Application of the electronic product to wide-angle lens is more and more, and the special applications of large aperture and ultra-wide angle are especially met simultaneously.
Accordingly, it would be desirable to a kind of large aperture bugeye lens, to avoid drawbacks described above.
The content of the invention
It is an object of the invention to provide a kind of large aperture bugeye lens, large aperture and ultra-wide angle can be simultaneously met
Special applications.
To solve the above problems, the present invention provides a kind of large aperture bugeye lens, including front group, diaphragm and rear group, tool
Body is included successively by light incident direction：It is first minus lenses, the second minus lenses, the 3rd plus lens, the 4th plus lens, first negative
Lens and the 6th plus lens, first minus lenses, the second minus lenses and the 3rd plus lens constitute front group, and the described 4th just
Group after lens, the 5th minus lenses and the 6th plus lens composition.
Further, first minus lenses have and are convex to the first surface of object space and concave towards the second surface of image space, position
In the top of camera lens；
Second minus lenses have the 3rd surface for concaving towards object space；
3rd plus lens have the 5th surface for being convex to object space and are convex to the surface of image space the 6th；
4th plus lens have and are convex to the 7th surface of object space and be convex to the 8th surface of image space；
5th minus lenses have to concave towards and the 9th surface of object space and concave towards the tenth surface of image space；
6th plus lens have and are convex to the 11st surface of object space and be convex to the 12nd surface of image space.
Further, the diaphragm is located at the 6th surface of the 3rd plus lens and the 7th table of the 4th plus lens
Between face.
Further, it is provided with aperture light between the 6th surface and the 7th surface of the 4th lens of the 3rd plus lens
Door screen, the aperture diaphragm is fixed aperture.
Further, in addition to the 5th minus lenses, all eyeglasses of camera lens using the eyeglass of plastic material, compare glass material
Matter, plastic material has the advantages that light weight, low cost, easily processed into type so that the production cost of wide-angle lens significantly drops
It is low, it is suitable to produce in enormous quantities.
Further, the focal length for rounding group eyeglass is f, and second eyeglass focal length is f2, and the 3rd eyeglass focal length is f3, with
Upper parameter meets following relation：
1<f2/f<3.5；
1.5<f3/f<3.5 and
0.3<f2/f3<1.5。
Further, the radius of curvature for taking the first plus lens thing side is R1, and image side radius of curvature is R2, and second is negative
The thing side radius of curvature of mirror is R3 and image side radius of curvature is R4, and above parameter meets following relation：
1.5<R2<2.5,0<R2/(R1+R2)<0.1 and
-1.5<(R3+R4)/(R3-R4)<0。
Further, the thickness for taking the first plus lens is T1, the second minus lenses thickness T2, is met between T1 and T2 following
Formula：
0.1<T1/(T1+T2)<1。
Further, the surface of each lens of the large aperture bugeye lens is aspheric surface, aspherical lens it
Surface radian is different from common spheric glass, is accomplished by changing the curved surface of eyeglass to pursue eyeglass thinness, and adopts ball in the past
Face is designed, and makes aberration and deformation increase, as a result occurs that obvious image is unclear, the bad phenomenon such as visual field distortion, the visual field are narrow and small；It is non-
The design of sphere, have modified image, the problems such as solve visual field distortion, meanwhile, make eyeglass lighter, thinner, more flat；And, still
Excellent shock resistance is kept, wearer is used safely.
Further, each lens non-spherical surface is even aspheric surface, and asphere coefficient meets equation below：
Wherein, the N of i=2,3,4 ..., z are the coordinates along optical axis direction, and Y is the radial direction in units of length of lens unit
Coordinate, C is curvature (1/R), and k is circular cone coefficient (Coin Constant), αiIt is the coefficient of each high-order term, 2i is aspheric
High power (the order of Aspherical Coefficient).
Further, each lens non-spherical surface can also be odd aspheric surface, and asphere coefficient meets equation below：
Wherein, the N of i=1,2,3,4 ..., can also equally reach purpose of design, and z is the coordinate along optical axis direction, Y be with
Length of lens unit for unit radial coordinate, C is curvature (1/R), and k is circular cone coefficient (Coin Constant), βiIt is each height
The coefficient of secondary item, i is aspheric high power (the order of Aspherical Coefficient).
Further, refractive index n of first minus lenses and dispersion v scopes are respectively：1.5 ＜ n1The ＜ v of ＜ 1.6,501
＜ 60；
Refractive index n and dispersion v scopes of second minus lenses is respectively：1.5 ＜ n2The ＜ v of ＜ 1.6,502＜ 60；
Refractive index n and dispersion v scopes of the 3rd plus lens is respectively：1.5 ＜ n2The ＜ v of ＜ 1.6,502＜ 60；
Refractive index n and dispersion v scopes of the 4th plus lens is respectively：1.5 ＜ n2The ＜ v of ＜ 1.6,502＜ 60；
Refractive index n and dispersion v scopes of the 5th minus lenses is respectively：1.6 ＜ n4The ＜ v of ＜ 1.7,234＜ 25；
Refractive index n and dispersion v scopes of the 6th plus lens is respectively：1.5 ＜ n2The ＜ v of ＜ 1.6,502＜ 60.
Further, there be optical filter the image side on the 12nd surface of the 6th lens, enters for filtering Infrared
Enter camera lens.
Preferably, the filter material is the glass material of BK7 models, and its thickness is 0.3mm, refractive index and dispersion point
Not Wei n=1.5168, v=64.17, using IR cut film plating process eliminate Infrared enter.
Compared with prior art, the present invention provides a kind of large aperture bugeye lens, the first surface of the first minus lenses compared with
For smooth, the 4th surface of the second minus lenses is more smooth, and the first minus lenses and the second minus lenses are used to carry out high angle scattered light
Collect, the outer visual field chief ray of effective bending axis so as to diminish relative to the angle of optical axis, so after reducing set of pieces size；
3rd plus lens are drum type lens, and its effect is the divergent rays for making front group of generation through pooling so as to pass through aperture below
Diaphragm.Lens set is organized after system aperture diaphragm and uses general optical collection system, wherein organizing the 4th plus lens afterwards and bearing
Lens have a larger focal power, and effect is positive and negative lens combination color difference eliminating, the 6th plus lens make the outer chief ray of axle according to
The angle of incidence that CMOS chip specifies carries out deviation, it is ensured that matching imaging sensor best while illuminance uniformity.The present invention
The camera lens of offer adopts six eyeglasses, and its F number is 1.6, with larger aperture, can control more light and enter into camera lens
It is interior, meet compared with the use demand under dark situation, while having ultra-wide angle, meet the imaging requirements of maximum 150 degree of angles of visual field.This
Outward, in addition to the 5th minus lenses are glass lens, rest of the lens is glass lens, the light weight of glass lens, low cost, is easy to
Machine-shaping so that the production cost of wide-angle lens is greatly reduced, is suitable to produce in enormous quantities.Each eyeglass is according between each element
Rational Arrangement, package assembly is simple, and function admirable, tolerance is good, is simple to manufacture, cheap.
Description of the drawings
Fig. 1 is the structural representation of the embodiment of the present invention one；
Fig. 2 is MTF curve figure of the embodiment of the present invention one under limiting resolution；
Fig. 3 is MTF curve figure of the embodiment of the present invention one under 1/2 limiting resolution；
Fig. 4 is the optical field diagram of the embodiment of the present invention one；
Fig. 5 is the optical distortion figure of the embodiment of the present invention one；
Fig. 6 is the point range figure of the embodiment of the present invention one；
Fig. 7 is the chromatic curve figure of the embodiment of the present invention one；
Fig. 8 is the relative luminance curve figure of the embodiment of the present invention one.
Reference：L1, the first minus lenses, L2, the second minus lenses, L3, the 3rd plus lens, the plus lens of L4 the 4th, L5,
Five minus lenses, L6, the 6th plus lens, S1, first surface, S2, second surface, S3, the 3rd surface, S4, the 4th surface, S5,
Five surfaces, S6, the 6th surface, S7, the 7th surface, S8, the 8th surface, S9, the 9th surface, S10, the tenth surface, S11, the tenth
One surface, S12, the 12nd surface, A, diaphragm, F, cutoff filter, P, protective glass.
Specific embodiment
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
The accompanying drawing to be used needed for having technology description is briefly described, it should be apparent that, drawings in the following description are these
Some bright embodiments, for those of ordinary skill in the art, on the premise of not paying creative work, can be with root
Other accompanying drawings are obtained according to these accompanying drawings.
Embodiment one
As shown in figure 1, the present embodiment provides a kind of large aperture bugeye lens, including front group, diaphragm A and rear group, specifically
Included successively by light incident direction：First minus lenses L1, the second minus lenses L2, the 3rd plus lens L3, the 4th plus lens L4,
5th minus lenses L5 and the 6th plus lens L6, the first minus lenses L1, the second minus lenses L2 and the 3rd plus lens L3 structures
Into front group, group after the 4th plus lens L4, the 5th minus lenses L5 and the 6th plus lens L6 compositions.
The first minus lenses L1 has and is convex to the first surface S1 of object space and concave towards the second surface S2 of image space, positioned at mirror
The top of head；
The second minus lenses L2 has the 3rd surface S3 for concaving towards object space；
The 3rd plus lens L3 has the 5th surface S5 for being convex to object space and is convex to the surface S6 of image space the 6th；
The 4th plus lens L4 has and is convex to the 7th surface S7 of object space and be convex to the 8th surface S8 of image space；
The 5th minus lenses L5 has to concave towards and the 9th surface S9 of object space and concaves towards the tenth surface S10 of image space；
The 6th plus lens L6 has and is convex to the 11st surface S11 of object space and be convex to the 12nd surface S12 of image space.
Aperture diaphragm is provided between the 6th surface S6 and the 7th surface S7 of the 4th lens of the 3rd plus lens L3
A, aperture diaphragm A are fixed aperture A.
The 4th surface S4 of the first surface S1 of the first minus lenses L1 and the second minus lenses L2 is almost plane,
The first minus lenses L1 and the second minus lenses L2, for carrying out visual field chief ray outside high angle scattered light collection, effective bending axis,
Make it diminish relative to the angle of optical axis, so reduce after set of pieces size.Thereafter the 3rd plus lens L3 is drum type lens, its
Effect is the divergent rays for converging front group generation so as to pass through aperture diaphragm A below；Organize lens set after system aperture diaphragm A to adopt
It is general optical collection system, wherein organizing the 4th plus lens L4 and the 5th minus lenses L5 compositions afterwards is similar to glued knot
Structure, with larger focal power, effect is positive and negative lens combination color difference eliminating, the 6th plus lens L6 make the outer chief ray of axle according to
The angle of incidence that CMOS chip specifies carries out deviation, it is ensured that matching imaging sensor best while illuminance uniformity.
5th minus lenses L5 adopts glass lens, and remaining lens using the eyeglass of plastic material, compares glass material, moulds
Material material has the advantages that light weight, low cost, easily processed into type so that the production cost of wide-angle lens is greatly reduced, and fits
In production in enormous quantities.
The focal length for rounding group eyeglass is f, and the second minus lenses L2 focal lengths are f2, and the 3rd plus lens L3 focal lengths are f3, and the above is joined
Following relation is met between number：
1<f2/f<3.5；
1.5<f3/f<3.5 and
0.3<f2/f3<1.5。
The radius of curvature for taking the first minus lenses L1 things side is R1 and image side radius of curvature is R2, the second minus lenses L2's
Thing side radius of curvature is R3 and image side radius of curvature is R4, and following relation is met between R1 and R2, between R3 and R4：
1.5<R2<2.5,0<R2/(R1+R2)<0.1 and
-1.5<(R3+R4)/(R3-R4)<0。
The thickness for taking the first minus lenses L1 is T1, and the second minus lenses L2 thickness is T2, and following public affairs are met between T1 and T2
Formula：
0.1<T1/(T1+T2)<1。
The surface of each lens of the large aperture bugeye lens is aspheric surface, its surface radian of aspherical lens with
Common spheric glass is different, is accomplished by changing the curved surface of eyeglass to pursue eyeglass thinness, and adopts spherical design in the past, makes
Aberration and deformation increase, as a result occur that obvious image is unclear, the bad phenomenon such as visual field distortion, the visual field are narrow and small；It is aspheric to set
Meter, have modified image, the problems such as solve visual field distortion, meanwhile, make eyeglass lighter, thinner, more flat；And, remain in that excellent
Shock resistance, use wearer safely.
Table 1 is a kind of system structure parameter of the wide-angle lens in one embodiment of the invention.As shown in table 1, arrange respectively
Have：
The optical surface (Surface) sequentially numbered along light incident direction, includes successively：The first of first minus lenses L1
The second surface S2 of surface S1, the first minus lenses L1, the 3rd surface S3 of the second minus lenses L2, the 4th table of the second minus lenses L2
Face S4, the 5th surface S5, the 6th surface S6 of the 3rd plus lens L3 of the 3rd plus lens L3, the 7th surface of the 4th plus lens L4
The 8th surface S8 of S7, the 4th plus lens L4, the 9th surface S9, the tenth surface of the 5th minus lenses L5 of the 5th minus lenses L5
S10, the 11st surface S11, the 12nd surface S12 of the 6th plus lens L6 of the 6th plus lens L6, cutoff filter F,
Protective glass P；Wherein：Surface type (Type), the curvature (C) of each optical surface on optical axis, along the light of light incident direction
Thickness (T) on axle between each optical surface and adjacent next optical surface, each optics along the optical axis of light incident direction
Material (Glass) between surface and adjacent next optical surface, half bore (Semi-Diameter), circular cone coefficient
(Conic), focal power (Focal power), wherein, the unit of thickness (T) and half bore (Semi-Diameter) is mm, bent
The unit of rate (C) and focal power (Focal power) is mm-1.
Table 2 is the aspherical surface data of large aperture wide-angle lens in one embodiment, on the basis of table 1, the idol of each optical surface
Secondary asphericity coefficients α2、α3、α4、α5、α6、α7、α8As shown in table 2, wherein asphericity coefficients can meet following equation：
I=7 is quadratic term up to 14 powers in the present embodiment, and z is the coordinate along optical axis direction, and Y is with length of lens
Unit for unit radial coordinate, C is curvature (1/R), and k is circular cone coefficient (Coin Constant), αiIt is that each high-order term is
Number, 2i is aspheric high power (the order of Aspherical Coefficient), using aspheric design,
The problems such as have modified image, solution visual field distortion, meanwhile, make eyeglass lighter, thinner, more flat.And, remain in that excellent resisting
Impact property, uses wearer safely.
Table 1
| surface | Type | Curvature | Thickness | Glass | Semi-Diameter | Conic |
| S1 | EVENASPH | 0.0359 | 1.0046 | E48R | 6.2193 | -4.5637 |
| S2 | EVENASPH | 0.4367 | 4.0470 | 3.3156 | -0.6187 | |
| S3 | EVENASPH | -0.2231 | 1.0322 | E48R | 3.2478 | 0.3589 |
| S4 | EVENASPH | 0.0124 | 1.6153 | 3.3482 | 0.0000 | |
| S5 | EVENASPH | 0.2372 | 3.9944 | E48R | 3.4710 | -1.0782 |
| S6 | EVENASPH | -0.1583 | 2.4907 | 3.1116 | 0.6276 | |
| A | STANDARD | 0.0000 | -0.2282 | 1.5908 | 0.0000 | |
| S7 | EVENASPH | 0.2661 | 1.2280 | E48R | 1.6789 | -0.1460 |
| S8 | EVENASPH | -0.1929 | 0.2129 | 1.7161 | -0.6211 | |
| S9 | EVENASPH | -0.1942 | 0.5000 | SP3810 | 1.6847 | -0.1732 |
| S10 | EVENASPH | 0.2664 | 0.0800 | 1.7491 | 0.2613 | |
| S11 | EVENASPH | 0.2473 | 1.5168 | E48R | 1.8209 | -1.9851 |
| S12 | EVENASPH | -0.1154 | 0.4000 | 1.7764 | -19.5312 | |
| 14 | STANDARD | 0.0000 | 0.3000 | BK7 | 1.8614 | 0.0000 |
| 15 | STANDARD | 0.0000 | 1.7930 | 1.9148 | 0.0000 | |
| 16 | STANDARD | 0.0000 | 0.4000 | BK7 | 2.4114 | 0.0000 |
| 17 | STANDARD | 0.0000 | 0.0500 | 2.4832 | 0.0000 | |
| 18 | STANDARD | 0.0000 | 0.0000 | 2.4794 | 0.0000 |
Table 2
As shown in Table 1：The first minus lenses L1 adopts the eyeglass of E4R model plastic materials, its refractive index n and dispersion v
Respectively n1=1.53, v1=56；
Second minus lenses L2 adopts the eyeglass of E4R model plastic materials, its refractive index n and dispersion v to be respectively n2=1.53,
v2=56；
3rd plus lens L3 adopts the eyeglass of E4R model plastic materials, its refractive index n and dispersion v to be respectively n3=1.53,
v3=56；
4th plus lens L4 adopts the eyeglass of E4R model plastic materials, its refractive index n and dispersion v to be respectively n4=1.53,
v4=56；
5th minus lenses L5 adopts the eyeglass of SP3810 model plastic materials, its refractive index n and dispersion v to be respectively n5=
1.64, v6=23.3；
6th plus lens L6 adopts the eyeglass of E4R model plastic materials, its refractive index n and dispersion v to be respectively n6=1.53,
v6=56.
The image side of the 6th plus lens L6 is provided with cutoff filter F and protective glass P along light incident direction,
The material of the cutoff filter F and protective glass P is BK7 glass, and the thickness 0.3mm of cutoff filter F is reflected
Rate and dispersion are respectively n=1.5168, v=64.17.Infrared is eliminated using IR cut film plating process.
It is corresponding, it is designed using odd aspherical equation, the general formula of odd aspherical equation is as follows：
Wherein, the N of i=1,2,3,4 ..., z is the coordinate along optical axis direction, and Y is the footpath in units of length of lens unit
To coordinate, C is curvature (1/R), and k is circular cone coefficient (Coin Constant), αiIt is the coefficient of each high-order term, i is aspheric
High power (the order of Aspherical Coefficient), can also equally reach purpose of design.
Diaphragm A is provided between the 3rd plus lens L3 and the 4th plus lens L4, the diaphragm A is aperture diaphragm.
The present embodiment large aperture bugeye lens coordinate OV9712 chips to realize 150 degree of angles of visual field, and it is controlled to distort
Within 65%, camera lens overall length is less than 20.5m to system, and (line is to every milli in Nyquist frequencies 166lp/mm for the transmission function of camera lens
Rice), more than 0.4 is reached within 0.8 visual field, realize visible light wave range (430nm-650nm) blur-free imaging, lens focus
1.87mm, F number is 1.6, cooperation CMOS pixel dimensions 3um, Diagonal Dimension 4.528mm, and (line is to every for cut-off frequency 166lp/mm
Millimeter).
Shown in Fig. 2 and Fig. 3 is respectively MTF curve figure and the present invention of the embodiment of the present invention one under limiting resolution
MTF curve figure of the embodiment one under 1/2 limiting resolution, MTF transfer curve figures (optical transfer function) can be comprehensive
The image quality of reflection system, its curve shape is more smooth, and relative X-axis height is higher, it was demonstrated that the image quality of system is better.
What Fig. 2 reflected is the MTF curve under sensor limiting resolutions, and different curves represent respectively each visual field light in Fig. 2 and Fig. 3
Line, in view of figure, under limiting resolution and below 1/2 limiting resolution, the curve in transfer curve figure compared with
Compact to smooth, the mtf value that curve is characterized is very high, and the aberration for illustrating system has obtained good correction.
The optical field diagram of the embodiment of the present invention one shown in Fig. 4 is refer to, right side graph is meridian side in curvature of field curve
To, leftmost curve is Sagittal field curvature, the two make the difference be exactly system astigmatism, astigmatism and the curvature of field are the weights for affecting the outer field rays of axle
Aberration, astigmatism is wanted to cross the serious image quality for having influence on system off-axis ray of conference, the curvature of field can cause center and peripheral optimal
Imaging not in one plane, is corrected within 50um from the curvature of field and astigmatism of system in view of figure, shows the present embodiment
The curvature of field and astigmatism be corrected in the pretty good scope of comparison.
Fig. 5 show the distortion figure of the embodiment of the present invention one, and distortion does not affect the definition of system, but can cause system
Anamorphose, for wide-angle lens, it is correcting distorted be it is extremely difficult, the distortion of the system is less than 65%, this explanation
Distortion has been remedied to an extraordinary degree.
Fig. 6 show the point range figure of the embodiment of the present invention one, and each field rays of point range figure display system are at image planes
The disperse degree for converging and being formed, so it characterizes system obtains various difference characteristics, the less proof of RMS radiuses of point range figure
The image quality of system is better.The disc of confusion RMS diameters of the system are respectively less than 15um, illustrate that aberration correction is very good.
Fig. 7 show the chromatic curve figure of the embodiment of the present invention one, and aberration, also known as chromatic aberration, is that of lens imaging is tight
Weight defect, aberration is exactly in simple terms the difference of color, is occurred in the case of with polychromatic light as light source.Understand according to figure, this reality
The wide-angle lens aberration of example offer is applied within 6um, shows that its Difference Control is good.
Fig. 8 show the relative luminance curve figure of the embodiment of the present invention one, and relative luminance is referred on imaging plane along light
The ratio of the axle angle of visual field and the brightness ratio at full filed angle, i.e. the diagonal corners brightness of CIS and central brightness, root
Understand according to picture, in 150 degree of the angle of visual field, its relative luminance still reaches more than 50% to the bugeye lens of the present embodiment one, table
Bright system can have good performance under low-light (level), and image quality meets requirement.
This enforcement provides a kind of large aperture bugeye lens, and the first surface S1 of the first minus lenses L1 is more smooth, and second
The 4th surface S4 of minus lenses L2 is more smooth, and the first minus lenses L1 and the second minus lenses L2 is used to carry out high angle scattered light receipts
Collection, the outer visual field chief ray of effective bending axis so as to diminish relative to the angle of optical axis, and then after reducing set of pieces size；The
Three plus lens L3 are drum type lens, and its effect is the divergent rays for making front group of generation through pooling so as to pass through aperture below
Diaphragm A.Lens set is organized after system aperture diaphragm A and uses general optical collection system, wherein organizing the 4th plus lens L4 afterwards
There is larger focal power with minus lenses, effect is positive and negative lens combination color difference eliminating, and the 6th plus lens L6 makes the outer chief ray of axle
The angle of incidence specified according to CMOS chip carries out deviation, it is ensured that matching imaging sensor best while illuminance uniformity.This
The camera lens that invention is provided adopts six eyeglasses, and its F number is 1.6, with larger aperture, can control more light and enter into
In camera lens, meet compared with the use demand under dark situation, while having ultra-wide angle, the imaging for meeting maximum 150 degree of angles of visual field will
Ask.In addition, it is only necessary to a piece of glass lens, in batch production, production cost is significantly reduced, six eyeglasses are according to each unit
Rational Arrangement between part, package assembly is simple, function admirable, and tolerance is good, is simple to manufacture, cheap.
Obviously, those skilled in the art can carry out the spirit of various changes and modification without deviating from the present invention to invention
And scope.So, if these modifications of the present invention and modification belong to the claims in the present invention and its equivalent technologies scope it
Interior, then the present invention is also intended to comprising these changes and modification.
Claims (10)
1. a kind of large aperture bugeye lens, by light incident direction the first minus lenses, the second minus lenses, the 3rd just are included successively
Lens, the 4th plus lens, the 5th minus lenses and the 6th plus lens, it is characterised in that：
First minus lenses have and are convex to the first surface of object space and concave towards the second surface of image space；
Second minus lenses have the 3rd surface for concaving towards object space；
3rd plus lens have the 5th surface for being convex to object space and are convex to the surface of image space the 6th；
4th plus lens have and are convex to the 7th surface of object space and be convex to the 8th surface of image space；
5th minus lenses have to concave towards and the 9th surface of object space and concave towards the tenth surface of image space；
6th plus lens have and are convex to the 11st surface of object space and be convex to the 12nd surface of image space；
The focal length for rounding group eyeglass is f, and the focal length of the second minus lenses is f2, and the focal length of the 3rd plus lens is f3, and above parameter expires
The following relation of foot：
1<f2/f<3.5；
1.5<f3/f<3.5 and
0.3<f2/f3<1.5。
2. large aperture bugeye lens according to claim 1, it is characterised in that：Take the song of the first minus lenses thing side
Rate radius is R1, and image side radius of curvature is R2, and the thing side radius of curvature of the second minus lenses is that R3 and image side radius of curvature are R4, with
Upper parameter meets following relation：
1.5<R2<2.5,0<R2/(R1+R2)<0.1 and
-1.5<(R3+R4)/(R3-R4)<0。
3. large aperture bugeye lens according to claim 1, it is characterised in that：The thickness for taking the first minus lenses is T1,
The thickness T2 of the second minus lenses, meets formula below between T1 and T2：
0.1<T1/(T1+T2)<1。
4. large aperture bugeye lens according to claim 1, it is characterised in that：It is first minus lenses, second negative
Each surface of mirror, the 3rd plus lens, the 4th plus lens, the 5th minus lenses and the 6th plus lens is aspheric surface.
5. large aperture bugeye lens according to claim 1, it is characterised in that：5th minus lenses adopt glass material
Matter eyeglass, the first minus lenses, the second minus lenses, the 3rd plus lens, the 4th plus lens and the 6th plus lens adopt plastic material
Eyeglass.
6. large aperture bugeye lens according to claim 5, it is characterised in that：
Refractive index n and dispersion v scopes of first minus lenses is respectively：1.5 ＜ n1The ＜ v of ＜ 1.6,501＜ 60；
Refractive index n and dispersion v scopes of second minus lenses is respectively：1.5 ＜ n2The ＜ v of ＜ 1.6,502＜ 60；
Refractive index n and dispersion v scopes of the 3rd plus lens is respectively：1.5 ＜ n2The ＜ v of ＜ 1.6,502＜ 60；
Refractive index n and dispersion v scopes of the 4th plus lens is respectively：1.5 ＜ n2The ＜ v of ＜ 1.6,502＜ 60；
Refractive index n and dispersion v scopes of the 5th minus lenses is respectively：1.6 ＜ n4The ＜ v of ＜ 1.7,234＜ 25；
Refractive index n and dispersion v scopes of the 6th plus lens is respectively：1.5 ＜ n2The ＜ v of ＜ 1.6,502＜ 60.
7. large aperture bugeye lens according to claim 4, it is characterised in that：Each lens non-spherical surface is even
Secondary aspheric surface, asphere coefficient meets equation below：
Wherein, the N of i=2,3,4 ..., z are the coordinates along optical axis direction, and Y is the radial coordinate in units of length of lens unit,
C is curvature (1/R), and k is circular cone coefficient, αiIt is the coefficient of each high-order term, 2i is aspheric high power.
8. according to the large aperture bugeye lens described in claim 4, it is characterised in that：Each lens non-spherical surface is
Odd aspheric surface, asphere coefficient meets equation below：
Wherein, the N of i=1,2,3,4 ..., z are the coordinates along optical axis direction, and Y is that the radial direction in units of length of lens unit is sat
Mark, C is curvature (1/R), and k is circular cone coefficient, βiIt is the coefficient of each high-order term, i is aspheric high power.
9. large aperture bugeye lens according to any one of claim 1-3, it is characterised in that：3rd plus lens
The 6th surface and the 7th surface of the 4th plus lens between be provided with aperture diaphragm.
10. large aperture bugeye lens according to any one of claim 1-3, it is characterised in that：Described 6th is just saturating
The image side on the 12nd surface of mirror is additionally provided with optical filter.
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| CN110412733B (en) * | 2019-06-29 | 2021-09-17 | 瑞声光学解决方案私人有限公司 | Image pickup optical lens |
| CN115453723B (en) * | 2022-09-06 | 2024-06-11 | 睿博感知科技(河北)有限责任公司 | Large-aperture lens with circular view and panoramic camera system |
| CN116520534B (en) * | 2023-06-28 | 2023-08-25 | 珠海市川富光学技术有限公司 | Wide-angle large-aperture short-flange video lens with focal length of 25mm |
| CN116626869B (en) * | 2023-07-26 | 2023-09-12 | 珠海市川富光学技术有限公司 | Medium-focus large-aperture short-flange video lens with focal length of 50mm |
| CN116661113B (en) * | 2023-07-26 | 2023-09-22 | 珠海市川富光学技术有限公司 | Medium-focus large-aperture short-flange video lens with focal length of 35mm |
| CN117075308B (en) * | 2023-10-17 | 2023-12-12 | 成都量芯集成科技有限公司 | Imaging optical system |
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