CN110361849A - Folding, which spreads out, mixes mobile lens - Google Patents
Folding, which spreads out, mixes mobile lens Download PDFInfo
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- CN110361849A CN110361849A CN201910623890.4A CN201910623890A CN110361849A CN 110361849 A CN110361849 A CN 110361849A CN 201910623890 A CN201910623890 A CN 201910623890A CN 110361849 A CN110361849 A CN 110361849A
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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
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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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Abstract
Folding, which spreads out, to be mixed mobile lens and is related to imaging lens technical field, and solving the problems, such as existing folding to spread out, to mix mobile lens difficulty of processing very big and second-rate.Mobile lens set gradually diaphragm, the biconvex lens with positive light coke, the first parallel flat, the diverging meniscus lens with negative power, the first positive meniscus lens with positive light coke, the second positive meniscus lens with positive light coke and the biconcave lens with negative power from the object side to the image side；Biconvex lens, diverging meniscus lens, the first positive meniscus lens, the second positive meniscus lens and biconcave lens two sides be all even aspheric surface；First parallel flat is diffraction optics face towards the face of object space, is index plane towards the face of image space.The present invention realizes higher resolution ratio using less lens number using the color difference of plate diffraction element correction mobile lens, improves folding and spreads out and mix the yield rate of mobile lens, is suitble to large-scale production.
Description
Technical field
The present invention relates to imaging lens technical fields, and in particular to folding, which spreads out, mixes mobile lens.
Background technique
With the fast development of smart phone, people pursue high pixel, high image quality take pictures effect while to mobile phone
The requirement of camera lens is also continuously improved.Easier to process in structure, image quality is just needed if it is intended to occupying a tiny space on the market
It is upper apparent, it is less expensive in price, improve the competitiveness of product.
Mobile lens currently on the market are substantially using refraction type structure, in order to realize high-resolution, lead to eyeglass
More, size is greatly, structure is complicated.
And the function that the existing refractive optics component of optical system for rolling over mixing of spreading out focuses, while again can it is few in the piece number,
In the simple situation of structure, extraordinary correcting chromatic aberration.But folding, which spreads out, at present mixes mobile lens and only stops theoretically, because spreading out
Penetrating face is applied on high order aspheric surface, and difficulty of processing is very big and second-rate.
Summary of the invention
To solve the above-mentioned problems, the present invention, which provides a kind of folding containing plate diffraction element and spreads out, mixes mobile lens.
Used technical solution is as follows in order to solve the technical problem by the present invention:
Folding, which spreads out, mixes mobile lens, sets gradually diaphragm, the biconvex lens with positive light coke, first from the object side to the image side
Parallel flat, the diverging meniscus lens with negative power, the first positive meniscus lens with positive light coke, with positive light coke
Second positive meniscus lens and biconcave lens with negative power；The biconvex lens, diverging meniscus lens, the first positive bent moon are saturating
The two sides of mirror, the second positive meniscus lens and biconcave lens is all even aspheric surface；First parallel flat is towards the face of object space
It is index plane towards the face of image space for diffractive optical surfaces.
The beneficial effects of the present invention are:
The present invention passes through biconvex lens, diverging meniscus lens, the first positive meniscus lens, the second positive meniscus lens and biconcave lens
Two sides be all even aspheric surface, can be very good amendment aberration, reach the requirement of high image quality.It is diffraction optics in conjunction with front surface
First parallel flat on surface, according to the special dispersion characteristics of diffractive optical surfaces, by diffractive optical surfaces position phase parameter
Setting, can be very good correction spherical system bring color difference.The optics of mobile lens of the present invention is designed based on parallel flat
System has the raising of highly significant in image quality, and good imaging quality, clarity are high, color difference is small.Compared in high order aspheric surface
Upper processing diffraction optics face, on plate process diffraction optics face may be implemented higher precision, higher diffraction efficiency and
The volume production of plate diffraction element may be implemented in higher yield rate.The present invention is using the first parallel flat as diffraction element school
The color difference of positive mobile lens realizes higher resolution ratio by using less lens number, improves folding and spreads out and mixes Mobile phone mirror
The yield rate of head, and it is suitble to large-scale production.
Detailed description of the invention
Fig. 1 spreads out for folding of the invention mixes the optical structure chart of mobile lens.
Fig. 2 spreads out for folding of the invention mixes the index path of mobile lens.
Fig. 3 spreads out for folding of the invention mixes the curvature of field figure of mobile lens.
Fig. 4 spreads out for folding of the invention mixes the distortion figure of mobile lens.
Fig. 5 spreads out for folding of the invention mixes the central vision MTF curve figure of mobile lens.
Fig. 6 is that folding of the invention spreads out the MTF curve figure mixed at the practical image height 1mm of mobile lens.
Fig. 7 is that folding of the invention spreads out the MTF curve figure mixed at the practical image height 2mm of mobile lens.
Fig. 8 is that folding of the invention spreads out the MTF curve figure mixed at the practical image height 3mm of mobile lens.
Fig. 9 is that folding of the invention spreads out the MTF curve figure mixed at the practical image height 3.7mm of mobile lens.
Figure 10 spreads out for folding of the invention mixes the chromatic longitudiinal aberration curve graph of mobile lens.
Figure 11 spreads out for folding of the invention mixes the relative illumination curve graph of mobile lens.
In figure: 1, diaphragm, 2, biconvex lens, the 3, first parallel flat, 4, diverging meniscus lens, the 5, first positive meniscus lens,
6, the second positive meniscus lens, 7, biconcave lens, 8, protection glass, 9, image planes.
Specific embodiment
The present invention is described in further details with reference to the accompanying drawings and examples.
Folding, which spreads out, mixes mobile lens, sets gradually diaphragm 1 from the object side to the image side, biconvex lens 2, the first parallel flat 3, bears
Meniscus lens 4, the first positive meniscus lens 5, the second positive meniscus lens 6 and biconcave lens 7.Biconvex lens 2 has positive light coke, bears
Meniscus lens 4 has negative power, and the first positive meniscus lens 5 has positive light coke, and the second positive meniscus lens 6 has positive light focus
Degree, biconcave lens 7 have negative power.The two sides of biconvex lens 2 is all even aspheric surface；First parallel flat 3 is towards object space
Face be diffractive optical surfaces, towards the face of image space be index plane；The two sides of diverging meniscus lens 4 is all even aspheric surface；First
The two sides of positive meniscus lens 5 is all even aspheric surface；The two sides of second positive meniscus lens 6 is all even aspheric surface；Biconcave lens 7
Two sides be all even aspheric surface.
Incident beam through diaphragm 1 limit beam after successively through biconvex lens 2, the first parallel flat 3, diverging meniscus lens 4, first just
It converges and is imaged in image planes 9 after 7 deviation of meniscus lens 5, the second positive meniscus lens 6 and biconcave lens.
The convex surface of diverging meniscus lens 4 is towards image space, and towards image space, the second positive bent moon is saturating on the convex surface of the first positive meniscus lens 5
The convex surface of mirror 6 is towards image space.Biconvex lens 2, the first parallel flat 3, diverging meniscus lens 4, the first positive meniscus lens 5, second are just
Meniscus lens 6 and biconcave lens 7 are coaxially disposed.Protection glass 8 can be equipped between image space and biconcave lens 7, protection glass 8 is adopted
With the second parallel flat that material is BK7.First parallel flat 3 uses optical plastic, refractive index 1.53, and Abbe constant is
55.7.As shown in Figure 1, being that present invention folding spreads out and mixes the optical structure chart of mobile lens.As shown in Fig. 2, being to roll over mixing of spreading out in Fig. 1
By the index path of the incident ray of each lens when mobile phone lens shooting.Wherein, biconvex lens 2, the first parallel flat 3, bear it is curved
Month lens 4, the first positive meniscus lens 5, the second positive meniscus lens 6 and biconcave lens 7 material be optical plastic.
Biconvex lens 2, diverging meniscus lens 4, the first positive meniscus lens 5, the second positive meniscus lens 6 and biconcave lens 7 two
Face is all even aspheric surface, and even aspheric surface can be very good amendment aberration, reaches high image quality requirement.Folding of the invention spreads out
Mix mobile lens not only eyeglass is few, size is small, structure is simple, but also take into account mobile lens production efficiently and high imaging quality
It is required that.
First parallel flat 3 is that front surface is diffractive optical surfaces, and rear surface is index plane.It is adopted in mobile lens lens group
Spread out the mode of mixing with folding, according to the special dispersion characteristics of diffractive optical surfaces, by diffractive optical surfaces position phase parameter
Setting, can be very good correction spherical system bring color difference, the optics of mobile lens of the present invention designed based on parallel flat
System has the raising of highly significant in image quality, and good imaging quality, clarity are high, color difference is small.Diffraction light is processed on curved surface
Surface is very difficult, and quality not can guarantee, and diffraction efficiency is lower, that is to say, that process compared on high order aspheric surface
Diffraction optics face, on plate process diffraction optics face it is easy to process, may be implemented higher precision, higher diffraction efficiency with
And higher yield rate.It is suitble to the large-scale production of mobile lens, plate diffraction element may be implemented by the method for injection molding
Volume production.The present invention using plate diffraction element correction mobile lens color difference, using less lens number, can be with only two kinds of optics
Material, by reasonable structure model selection and optimization design, mobile lens use five lens arrangement forms and even aspheric surface phase
In conjunction with, and the first parallel flat 3 of plate diffraction element is introduced between biconvex lens 2 and diverging meniscus lens 4, it effectively reduces and is
System axial chromatic aberration keeps lens construction compact, and image quality is outstanding, and easy to process.Folding of the invention, which spreads out, mixes mobile lens not only
Eyeglass is few, size is small, structure is simple, pixel is high, realizes higher resolution ratio, and takes into account the scale of mass production of mobile lens
With high-resolution requirement, improves folding and spread out and mix the yield rate of mobile lens.
Present invention folding, which spreads out, mixes the F=6.71mm of mobile lens, and FOV=58 °, FNO=2.6, TTL=8.39mm.Wherein,
F is the whole focal length value of camera lens, and FOV is full filed angle, and FNO is f-number, and TTL is optical lens overall length.
The relevant parameter of table 1 is that folding of the invention spreads out and mixes mobile lens from object space (OBJ) to all of image space (IMA)
The relevant parameters such as surface type, radius of curvature, thickness, refractive index and the Abbe constant in each face of lens.
Table 1:
In upper table, STO corresponds to diaphragm 1, the corresponding biconvex lens 2 of face serial number 2 and 3, first parallel flat of face serial number 4 and 53,
Face serial number 6 and 7 corresponds to corresponding first positive meniscus lens 5 of diverging meniscus lens 4, face serial number 8 and 9, face serial number 10 and 11 corresponding second
Positive meniscus lens 6, the corresponding biconcave lens 7 of face serial number 12 and 13, the corresponding biconvex lens 2 of face serial number 14 and 15, image space, that is, image planes 9.
Meanwhile the even aspheric surface mirror surface formula in the present invention meets:
In above formula: h indicates the Y axis coordinate value of each point on lens surface；C is the inverse of the radius of curvature r of lens surface；k
For circular cone coefficient, a1、a2、a3、a4、a5、a6For order aspherical system；It along optical axis direction is highly being the position of h that Z, which is aspherical,
When, the distance vector height apart from aspheric vertex of surface.Table 2.1 and table 2.2 indicate the asphericity coefficient table of each mirror surface jointly.E generation
Table scientific notation.
Table 2.1:
| Face serial number | Circular cone coefficient | a1 | a2 |
| STO | 0 | 0 | 0 |
| 2 | -0.233 | 2.478E-004 | 2.279E-003 |
| 3 | 95.993 | 8.272E-003 | -6.998E-003 |
| 4 | 0 | 0 | 0 |
| 5 | 0 | 0 | 0 |
| 6 | -125.130 | -0.012 | 2.515E-003 |
| 7 | -9.437 | 9.418E-003 | -2.455E-003 |
| 8 | -9.048 | -0.022 | 1.755E-004 |
| 9 | 20.118 | -0.012 | -3.171E-003 |
| 10 | -280.000 | 0.015 | -4.067E-003 |
| 11 | -5.061 | -5.100E-003 | 2.437E-003 |
| 12 | 34.424 | -9.971E-003 | 2.395E-004 |
| 13 | -7.991 | -9.054E-003 | 1.175E-003 |
| 14 | 0 | 0 | 0 |
| 15 | 0 | 0 | 0 |
| IMA | 0 | 0 | 0 |
Table 2.2
| Face serial number | a3 | a4 | a5 | a6 |
| STO | 0 | 0 | 0 | 0 |
| 2 | -1.592E-003 | 2.766E-004 | 1.938E-004 | -7.230E-005 |
| 3 | 5.259E-003 | 6.537E-004 | -2.193E-003 | 6.316E-004 |
| 4 | 0 | 0 | 0 | 0 |
| 5 | 0 | 0 | 0 | 0 |
| 6 | -7.978E-004 | 2.367E-004 | -1.656E-004 | 3.115E-005 |
| 7 | 8.278E-004 | -9.244E-005 | -5.702E-005 | 1.100E-005 |
| 8 | 9.969E-004 | -5.295E-004 | 1.483E-004 | -1.693E-005 |
| 9 | 2.663E-004 | 8.041E-005 | -1.738E-006 | -2.000E-006 |
| 10 | 3.362E-005 | 1.478E-005 | 1.148E-006 | -1.498E-007 |
| 11 | -4.347E-004 | -1.472E-005 | 8.805E-007 | 5.855E-007 |
| 12 | 6.439E-005 | -2.539E-006 | 2.563E-008 | -6.890E-010 |
| 13 | -1.561E-004 | 7.405E-006 | -1.821E-007 | 5.535E-009 |
| 14 | 0 | 0 | 0 | 0 |
| 15 | 0 | 0 | 0 | 0 |
| IMA | 0 | 0 | 0 | 0 |
The position phase parameter of diffraction surfacesIt is determined by following equation:
In formula: M is diffraction progression, and N is the polynomial order of diffraction surfaces, AiFor each order coefficient of diffraction surfaces multinomial, ρ
For the aperture of diffraction surfaces.Table 3 is diffraction face data,
Table 3:
| Face serial number | M | N | A1 | ρ |
| 4 | 1 | 1 | -30.587 | 1.500 |
As shown in figure 3, being that present invention folding spreads out and mixes the curvature of field figure of mobile lens.S represents Sagittal field curvature, and T represents meridian field
Song, both Sagittal field curvature and meridianal curvature of field make the difference be exactly system astigmatism, astigmatism and the curvature of field are the weights for influencing the outer field rays of axis
Aberration is wanted, astigmatism crosses the image quality that conference highly impacts system off-axis ray, and it is best that the curvature of field will cause center and peripheral
Imaging is not in a plane, and from the point of view of curve in Fig. 3, the curvature of field and astigmatism of system are remedied within 0.05mm.
As shown in figure 4, being that present invention folding spreads out and mixes the distortion figure of mobile lens.Distortion does not influence the clarity of system, but
It is that can cause system variant.The optical distortion of this system is less than 1%, i.e., picture distortion caused by mobile lens is said less than 1%
Bright distortion has been remedied to an extraordinary degree.
It is MTF (optical-modulation transfer function) curve graph of camera lens of the present invention as shown in Fig. 5~Fig. 9, wherein ordinate
OTF coefficient indicates optical modulation function coefficients, and abscissa spatial frequency indicates demand pairs/mm as unit of period every mm, wherein
Curve a indicates T diffraction limit in Fig. 6~Fig. 9, and block curve b indicates S diffraction limit, curve LS1It indicates to deviate sagitta of arc side
To the visual field of 1mm, curve LT1Indicate the visual field for deviateing meridian direction 1mm, curve LS2Indicate the visual field for deviateing sagitta of arc direction 2mm,
Curve LT2Indicate the visual field for deviateing meridian direction 2mm, curve LS3Indicate the visual field for deviateing sagitta of arc direction 3mm, curve LT3Indicate inclined
Visual field from meridian direction 3mm, curve LS3.7Indicate the visual field for deviateing sagitta of arc direction 3.7mm, curve LT3.7It indicates to deviate meridian side
To the visual field of 3.7mm.If Fig. 5~Fig. 9 can be with the image quality of concentrated expression system, curve shape is more smooth, and opposite X-axis
Height it is higher, it was demonstrated that the image quality of system is better.
It as shown in Figure 10, is the chromatic curve figure of camera lens of the present invention, color difference (three color of light of red, green, blue of camera lens of the present invention
Mutual phase difference) all control within 2.2 μm (pixel of the mobile lens in present embodiment up to 22,000,000, this embodiment party
The pixel size of 22,000,000 mobile lens of formula is 1.1, so camera lens color difference of the invention is in 2 pixel size industry requirements
Within), fully meet demand.Meanwhile chromatic longitudiinal aberration≤1 μm of mobile lens.
It as shown in figure 11, is the relative illumination curve graph of camera lens of the present invention, edge relative illumination is 55% or so, city of arranging in pairs or groups
Field mainstream chip fully meets demand.
The folding of the invention known to Fig. 3~11 spreads out, and the good imaging quality for mixing mobile lens, clarity are high, color difference is small.
The above is only a preferred embodiment of the present invention, it should be pointed out that: for the ordinary skill people of the art
For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also answered
It is considered as protection scope of the present invention.
Claims (10)
1. folding, which spreads out, mixes mobile lens, which is characterized in that set gradually diaphragm (1) from the object side to the image side, with positive light coke
Biconvex lens (2), the first parallel flat (3), the diverging meniscus lens (4) with negative power, first with positive light coke are just
Meniscus lens (5), the second positive meniscus lens (6) with positive light coke and the biconcave lens (7) with negative power；It is described double
Convex lens (2), diverging meniscus lens (4), the first positive meniscus lens (5), the second positive meniscus lens (6) and biconcave lens (7) two
Face is all even aspheric surface；First parallel flat (3) is diffractive optical surfaces towards the face of object space, and the face towards image space is
Index plane.
2. folding as described in claim 1, which spreads out, mixes mobile lens, which is characterized in that the biconvex lens (2), first are put down in parallel
Plate (3), diverging meniscus lens (4), the first positive meniscus lens (5), the material of the second positive meniscus lens (6) and biconcave lens (7) are equal
For optical plastic.
3. folding as described in claim 1, which spreads out, mixes mobile lens, which is characterized in that the image space and biconcave lens (7) it
Between be equipped with protection glass (8).
4. folding as claimed in claim 3, which spreads out, mixes mobile lens, which is characterized in that the refractive index of the biconvex lens (2) is
1.53, Abbe constant 55.7；The refractive index of diverging meniscus lens (4) is 1.63, Abbe constant 23.9；First positive meniscus lens
(5) refractive index is 1.63, Abbe constant 23.9；The refractive index of second positive meniscus lens (6) is 1.53, and Abbe constant is
55.7；The refractive index of biconcave lens (7) is 1.53, Abbe constant 55.7, and the refractive index of protection glass (8) is 1.52, Abbe
Constant is 64.2, and the refractive index of first parallel flat (3) is 1.53, Abbe constant 55.7.
5. folding as described in claim 1, which spreads out, mixes mobile lens, which is characterized in that the convex surface court of the diverging meniscus lens (4)
To image space, the convex surface of first positive meniscus lens (5) towards image space, second positive meniscus lens (6) convex surface towards picture
Side.
6. folding as described in claim 1, which spreads out, mixes mobile lens, which is characterized in that the biconvex lens (2), first are put down in parallel
Plate (3), diverging meniscus lens (4), the first positive meniscus lens (5), the second positive meniscus lens (6) and biconcave lens (7) coaxial arrangement.
7. folding as described in claim 1, which spreads out, mixes mobile lens, which is characterized in that the focal length value of the camera lens is 6.71mm,
Full filed angle is 58 °, f-number 2.6, lens length 8.39mm.
8. folding as described in claim 1, which spreads out, mixes mobile lens, which is characterized in that the position phase parameter of the diffractive optical surfacesFor
In formula: M is diffraction progression, and N is the polynomial order of diffraction surfaces, AiFor each order coefficient of diffraction surfaces multinomial, ρ is to spread out
Penetrate the aperture in face.
9. folding as claimed in claim 8, which spreads out, mixes mobile lens, which is characterized in that institute's rheme coherent number is -68.821.
10. folding as claimed in claim 9, which spreads out, mixes mobile lens, which is characterized in that figure caused by the mobile lens
Distortion is less than 1%.
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| CN110908075A (en) * | 2019-12-05 | 2020-03-24 | 瑞声通讯科技(常州)有限公司 | Image pickup optical lens |
| CN112162381A (en) * | 2020-10-13 | 2021-01-01 | 西安石油大学 | Super wide angle refraction and diffraction cell-phone auxiliary lens |
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| CN112162381A (en) * | 2020-10-13 | 2021-01-01 | 西安石油大学 | Super wide angle refraction and diffraction cell-phone auxiliary lens |
| CN112595422A (en) * | 2020-11-03 | 2021-04-02 | 中国航空工业集团公司洛阳电光设备研究所 | Blocking piece and light path based on scene temperature non-uniform correction |
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Application publication date: 20191022 |
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