CN107894655A - A kind of mobile lens module using annular aperture diffraction optics - Google Patents
A kind of mobile lens module using annular aperture diffraction optics Download PDFInfo
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- CN107894655A CN107894655A CN201711088341.9A CN201711088341A CN107894655A CN 107894655 A CN107894655 A CN 107894655A CN 201711088341 A CN201711088341 A CN 201711088341A CN 107894655 A CN107894655 A CN 107894655A
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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
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/0025—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for optical correction, e.g. distorsion, aberration
- G02B27/0037—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for optical correction, e.g. distorsion, aberration with diffracting elements
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/42—Diffraction optics, i.e. systems including a diffractive element being designed for providing a diffractive effect
- G02B27/4205—Diffraction optics, i.e. systems including a diffractive element being designed for providing a diffractive effect having a diffractive optical element [DOE] contributing to image formation, e.g. whereby modulation transfer function MTF or optical aberrations are relevant
- G02B27/4211—Diffraction optics, i.e. systems including a diffractive element being designed for providing a diffractive effect having a diffractive optical element [DOE] contributing to image formation, e.g. whereby modulation transfer function MTF or optical aberrations are relevant correcting chromatic aberrations
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The invention belongs to optical image technology field, discloses a kind of mobile lens module using annular aperture diffraction optics, it includes：At least 5 lens, infrared fileter, the sensors sequentially coaxially arranged from the object side to the image side；In at least 5 lens, the diffraction optics face with annular aperture is arranged to close to the last a piece of lens of image space or a side surface of second from the bottom lens.Diffractive optical surfaces are disposed in proximity on last a piece of or second from the bottom lens of image planes in the present invention, it is away from aperture diaphragm, insensitive to build-up tolerance and face type error, even if the machining accuracy of diffraction surfaces micro-structural has slight errors, the influence to overall imaging effect is also little；Using diffraction optical lens, the mismachining tolerance susceptibility in diffraction optics face can be greatly reduced, improve the yield rate of mobile phone imaging lens module.
Description
Technical field
The invention belongs to optical image technology field, is related to a kind of Mobile phone mirror head mould using annular aperture diffraction optics
Group.
Background technology
With the fast development of smart mobile phone industry, mobile phone imaging lens module from initial hundreds of thousands pixel develop into
20,000,000 modern pixels, the mobile lens of more than 10,000,000 pixels have become the mainstream configuration of camera cell phone.With nanoscale
The fast development of optics Ultra-precision Turning technique, non-spherical element are widely used to mobile lens, to mobile phone lens imaging matter
The requirement of amount also improves constantly, and assembly precision and concentricity more seek also more and more higher, and the mobile lens module of high quality is general
The kludge of automatic centering can only be used to be assembled, can be only achieved preferable yield rate.Different, the mesh according to sensor used
Preceding more than 10,000,000 pixel mobile phone lens full filed angle is up to 80 °~90 °, and aperture 2.8~2.1 or so, camera lens overall length is less than
6mm, most short even 4 points several.Existing 10,000,000 pixel mobile phone lens use 5P (plastics), 2G (Glass) 3P more
, or more (Plastics) structure of eyeglass.Eyeglass number is more, and structure is complex.
Compared to all one can be entered using the optical system of refractor, the in imaging systems use of diffraction optical lens
The aberration of correction system is walked, can make that the overall length of optical system is shorter, dispersion is preferable, design freedom is more, greatly
The structure and performance of improvement system.Described diffraction optical lens, it is on aspherical or sphere surface, passes through superfinishing
Close processing or the method for etching, carve out periodic distribution, size in the other single order of wavelength level or the micro- knot of multistage zigzag
Structure, it is used for introducing additive phase, and the aberration and ripple difference to optical system are compensated, and especially aberration and off-axis aberration are rectified
It is just especially effective.
Patent US9341857B2 proposes a kind of mobile lens module for 4 glass lens for being provided with diffraction optical lens,
As shown in Fig. 1.It is provided with diffraction optics face (DOE, i.e. diffractive on the second face r2 surfaces of first lens
Optical element), optics overall length is substantially reduced, greatly improves image quality and modulation transfer function, design knot
Fruit is very perfect.But there is the problem of fairly obvious in this structure：1. the diffraction optics identity distance in second face is from the hole of forefront
Footpath diaphragm (Stop) is too near, its to build-up tolerance (as it is eccentric, tilt, thickness error) and face type error susceptibility very
Height, the imaging that any rigging error all can be to whole visual field are produced and had a strong impact on.2. because diffraction surfaces are filled with whole optics table
Face, very harsh is more asked to the machining accuracy of diffraction surfaces micro-structural, face type error, the zigzag of any saw tooth like microstructures are micro-
The local misalignment of the slight rounding of structural edge or saw tooth like microstructures, veiling glare, zero-order terms and twin-image can be all introduced (such as picture
Occur bright spot among face) or other multiorder diffractive hot spots (for example ghost image occur in image planes), then put by several eyeglasses below
After big, the influence to whole optical system imaging is extremely serious.3. diffraction optics face employs Advanced Diffraction coefficient, its B1
~B7 term coefficients all have setting, and from the axle center of lens to edge, the phase fluctuation of diffraction surfaces is very fast, causes diffraction surfaces
The cycle of saw tooth like microstructures and sawtooth Level Change are very fast, add the difficulty of micro-structural processing, even if optical system
Design result is very perfect, but is subject to processing the limitation of precision, causes its yield rate very low, imaging effect becomes on the contrary
Difference.
The patent US7375907B2 of other Hong Hai groups it is also proposed a kind of 3 plastics for being provided with diffraction optical lens
Eyeglass.It is provided with diffraction optics face on the concave surface in first face of second, and there is also it is also significant that problem for it：1.
The concave surface of second mirror is closer from nearly aperture diaphragm, its to processing and build-up tolerance (as bias, inclination, thickness error, with
And face type error) susceptibility it is very high, imaging that any rigging error all can be to whole visual field sternly life has a strong impact on.2. spread out
The face of penetrating is filled with whole optical surface, more asks very harsh to the machining accuracy of diffraction surfaces micro-structural, any saw tooth like microstructures
Face type error, the rounding of jagged edges or dislocation, can all introduce veiling glare, zero-order terms and twin-image or other multi-level diffraction lights
Spot.3. diffraction optics face employs Advanced Diffraction coefficient, its p2~p10 term coefficient all has the phase of setting, i.e. diffraction surfaces
Fluctuation is very fast, causes the cycle of diffraction surfaces saw tooth like microstructures and sawtooth Level Change very fast, even if optical system is set
It is very perfect to count result, but is subject to processing the limitation of precision, causing its yield rate to be also can be very low.
The content of the invention
(1) goal of the invention
The purpose of the present invention is：A kind of mobile lens module using annular aperture diffraction optics is provided, simplified in structure
On the basis of, improve yield rate and imaging effect.
(2) technical scheme
In order to solve the above-mentioned technical problem, the present invention provides a kind of Mobile phone mirror head mould using annular aperture diffraction optics
Group, it includes：At least 5 lens, infrared fileter, the sensors sequentially coaxially arranged from the object side to the image side；At least 5 thoroughly
In mirror, it is arranged to that there is spreading out for annular aperture close to the last a piece of lens of image space or a side surface of second from the bottom lens
Penetrate optical surface.
(3) beneficial effect
The mobile lens module using annular aperture diffraction optics that above-mentioned technical proposal is provided, it has following obvious
Advantage：
1. because diffractive optical surfaces are disposed in proximity on last a piece of or second from the bottom lens of image planes, it is away from hole
Footpath diaphragm, it is insensitive to build-up tolerance (such as eccentric, inclination, thickness error) and face type error, even if diffraction surfaces micro-structural
There are slight errors in machining accuracy, the slight rounding of the face type error, jagged edges such as saw tooth like microstructures or dislocation,
Influence to overall imaging effect is also little.
2. generally, aspherical optical system is more serious with aberration in addition and dispersion ratio in image planes 0.7, and
View field imaging result within 0.7 band all compares preferably.To ensure that the visual field within 0.7 band is not processed by diffraction micro structural
The influence of error, for example veiling glare or zero-order terms and twin-image, diffraction optical lens of the present invention, its aperture are arranged to
Inside and outside two regions, the two regions are used as line of demarcation, internal aperture circle using the position of the ratio of full aperture 0.7 or 0.8
Domain, remain common optical aspherical surface (non-diffraction face)；And a circle annular region in outer aperture is then arranged to diffraction surfaces, only
For correcting image space 0.7 with off-axis aberration in addition.The mismachining tolerance that diffraction optics face can so be greatly reduced is sensitive
Degree, the yield rate for improving mobile phone imaging lens module.
Brief description of the drawings
Fig. 1 is the mobile lens module with diffraction optical lens that prior art Patent US9341857B2 is proposed.
Fig. 2 is the structure principle chart of mobile lens module in the embodiment of the present invention 1.
Fig. 3 is the index path of mobile lens module in the embodiment of the present invention 1.
Fig. 4 is the point range figure of mobile lens module in the embodiment of the present invention 1.
Fig. 5 is the curvature of field and distortion figure of mobile lens module in the embodiment of the present invention 1.
Fig. 6 is the modulation transfer function curve of mobile lens module in the embodiment of the present invention 1.
Fig. 7 is axial MTF curve (depth of focus) figure of mobile lens module in the embodiment of the present invention 1.
Fig. 8 is the cut away view in kind of mobile lens module in the embodiment of the present invention 1.
Fig. 9 is the structure principle chart of mobile lens module in the embodiment of the present invention 2.
Figure 10 is the structure principle chart of mobile lens module in the embodiment of the present invention 3.
Figure 11 is the index path of mobile lens module in the embodiment of the present invention 3.
Figure 12 is the point range figure of mobile lens module in the embodiment of the present invention 3.
Figure 13 is the curvature of field and distortion figure of mobile lens module in the embodiment of the present invention 3.
Figure 14 is the modulation transfer function curve of mobile lens module in the embodiment of the present invention 3.
Figure 15 is axial MTF curve (depth of focus) figure of mobile lens module in the embodiment of the present invention 3.
Figure 16 is the structure principle chart of mobile lens module in the embodiment of the present invention 4.
Figure 17 is the index path of mobile lens module in the embodiment of the present invention 4.
Figure 18 is the point range figure of mobile lens module in the embodiment of the present invention 4.
Figure 19 is the curvature of field and distortion figure of mobile lens module in the embodiment of the present invention 4.
Figure 20 is the modulation transfer function curve of mobile lens module in the embodiment of the present invention 4.
Figure 21 is axial MTF curve (depth of focus) figure of mobile lens module in the embodiment of the present invention 4.
Embodiment
To make the purpose of the present invention, content and advantage clearer, with reference to the accompanying drawings and examples, to the present invention's
Embodiment is described in further detail.
Based on the shortcomings of the prior art, the present invention proposes a kind of Mobile phone mirror using annular aperture diffraction optical element
Head mould group, it is made up of more than 5 lens, and it is set close to last a piece of or second from the bottom eyeglass of image planes on its surface
The diffraction optics face of annular aperture, the diffraction optics face of annular aperture, it is the type of binary face 3 (Binary 3), and its aperture is set
For two regions, the border circular areas of internal aperture is common optical aspherical surface (non-diffraction face)；The one ring shape in its outer aperture
Region is then diffraction surfaces.The annular region in outer aperture, it is the region beyond the 0.7 or 0.8 of eyeglass full aperture.Annular aperture
Diffraction optics face be mainly used to correct peripheral field 0.7 with off-axis aberration (dispersion, astigmatism, coma) in addition, improve modulation
Transmission function (MTF), increase relative illumination, while can suitably reduce the overall length of optical system.
Embodiment 1
A kind of mobile lens module using annular aperture diffraction optical element involved in the present invention, embodiment 1
Structure chart is as shown in Figure 2.
A kind of mobile lens module using annular aperture diffraction optical element described in the present embodiment 1, from object space to picture
Side, its respectively by 5 plastic lens, respectively the 1st lens 110, the 2nd lens 120, the 3rd lens 130, the 4th thoroughly
150,1 mirror 140, the 5th lens infrared filter 160, and sensor 170 form.
From the object side to the image side, the 1st described lens 110 are until the 4th lens 140 are all non-spherical lens.Described
1st lens 110, it is meniscus；The 2nd described lens 120, it is concavo-concave lens；The 3rd described lens
130, it is the lens that two faces in left and right are all wavy curved surface；The 4th described lens 140, it is concave-convex lens.
The 5th described lens 150, it is middle concave, convex diffraction lens is slowly become to edge.It is close to object space
First face, i.e. left side curved surface 151 are common optical aspherical surface；Its second face, i.e. the right curved surface 152 close to image space
The diffraction optics face of annular aperture is arranged to, it is the type of binary face 3 (Binary 3), and its aperture is provided with two regions：Diameter D1
Within border circular areas 152A, and diameter D1 to the outer ring annular region 152B between diameter D2.Within described diameter D1
Border circular areas 152A, it is the border circular areas within radial coordinate 1.848mm, accounts for the ratio of the full aperture size of the curved surface 152
Example is 0.8, and it is common optical aspherical surface (non-diffraction face).Described outer ring annular region 152B, it is radial coordinate
Annular region beyond 1.848mm, it is diffraction surfaces, and it is periodic distribution, size is micro- in the other single order zigzag of wavelength level
Structure, it is used for introducing additive phase, the aberration and off-axis aberration of the peripheral field of optical system is corrected, and makes whole
The imaging of picture is all than more visible.
Described infrared filter 160, its material are glass, and its front and rear surfaces is plated with dielectric film, and it is through visible
Light, and infrared ray is filtered；Described sensor 170, it is the cmos sensor of 13,000,000 pixels.
A kind of mobile lens module using annular aperture diffraction optical element described in the present embodiment 1, described optics
The parameter such as system, type, radius of curvature, optical thickness, material, diameter and the circular cone coefficient in each of which face such as table below
Shown in 1：
The optical system parameter of form 1.
The asphericity coefficient in the face of 111 face~151 is as shown in following table 2：
The asphericity coefficient in the face of 111 faces described in form 2.~151
The face of 111 face~115 it is aspherical, its curved surface rise is as described in below equation (1) formula：
In formula, z is the rise of curved surface；R is radial coordinate；a1~a8Respectively even order terms r2~r16Coefficient；K is circular cone
Coefficient；C is curvature, and it is the inverse of radius of curvature.
The 5th described lens 150, it is close to the diffraction optics face that the right curved surface 152 of image space is annular aperture, its face
Type is the type of binary face 3 (Binary 3), and a circle annular region in its outer aperture is then wavelength level, periodic micro-structural diffraction
Described in face, its diffraction term coefficient and the following form 3 of aspherical surface data：
The 5th lens 150 described in form 3., the diffraction term coefficient (phase coefficient) and aspheric of the right curved surface 152
Face coefficient：
The described type of binary face 3 (Binary 3), its curved surface rise and phase distribution refer to following formula (2)~public affairs
Formula (5)：
Border circular areas 152A within the diameter D1, its aspherical rise are represented by following formula (2)：
In formula, z1For the curved surface rise of the border circular areas 152A within diameter D1；R is radial coordinate；a1iRespectively even
Item r2iCoefficient, shown in its detailed data reference table 3；k1For border circular areas 152A circular cone coefficient；c1For border circular areas
152A curvature, it is the inverse of radius of curvature.
Diameter D1 is represented by following formula (3) to the outer ring annular region 152B between diameter D2, its curved surface rise：
In formula, z1Curved surface rise for diameter D1 to the outer ring annular region 152B between diameter D2；z0For initial rise,
It is the z that is drawn in formula (2) as r=A11Value；R is radial coordinate；a2iRespectively even order terms r2iCoefficient, its is detailed
Shown in data reference form 3；k2For annular region 152B circular cone coefficient；c2For outer ring annular region 152B curvature, it is
The inverse of radius of curvature.
The right curved surface 152, the border circular areas 152A and outer ring annular region 152B within its diameter D1 have independent
Phase distribution, for the border circular areas 152A within diameter D1, its phase distribution such as below equation (4) represents：
Wherein
In formula, Φ1For the phase distribution of the border circular areas 152A within diameter D1；ρ1For normalized radial coordinate, i.e. phase
Position；β1iFor even order terms phase multinomial ρ1 2iCoefficient, shown in its detailed data reference table 3；M1For border circular areas 152A's
Diffraction progression, because the region is not provided with diffraction optics face, simply common aspherical, the diffraction progression is arranged to 0.
It is for example following to the outer ring annular region 152B between diameter D2, the phase distribution in its diffraction optics face for diameter D1
Formula (5) represents：
Wherein
In formula, Φ2Phase distribution for diameter D1 to the outer ring annular region 152B between diameter D2；δ0It is initial for phase
Value, it is when radial coordinate r is in A1The Φ drawn during position according to formula (4)1Value；ρ2For normalized radial coordinate, i.e. phase
Position, here normalized radial coordinate A2It is arranged to 10；β2iRespectively even order terms multinomial ρ2 2iCoefficient, its detailed data ginseng
Examine shown in form 3；M2For outer ring annular region 152B diffraction progression, this specific embodiment sets M2For 1, i.e. its wavelength
The zigzag micro-structural of level only has a step.
It can be seen that from form 3：The right curved surface 152, the outer ring annular region 152B, its periodic micro- knot
Structure diffraction surfaces, only two phase coefficients：P2^2 phase coefficient β21：39484.163 and p2^4 phase coefficient β22： -
499328.92, and other advanced coefficients all 0, it can so ensure the phase fluctuation of its diffraction surfaces than shallower, so as to
Ensure that cycle and the sawtooth Level Change of diffraction surfaces saw tooth like microstructures are all relatively more continuous and slow, it is ensured that diffraction lens ultraprecise
Processing and the yield rate of injection.
A kind of mobile lens module using annular aperture diffraction optical element involved in the present invention, embodiment 1
Index path is designed as shown in figure 3, its optics overall length is 3.69284mm.Its point range figure is as shown in Figure 4；Its curvature of field and distortion are as schemed
Shown in 5, the aberration control of optical system is within 5%；Its modulation transfer function (MTF) curve is as shown in fig. 6, from 0~1
All visual fields, when spatial frequency is 110 line pair, its resolution ratio is controlled more than 0.5；Its axial MTF curve (i.e. depth of focus) is such as
Shown in Fig. 7.
A kind of mobile lens module using annular aperture diffraction optical element involved in the present invention, embodiment 1
As shown in figure 8, described 5 plastic lens 110,120,130,140,150, its flange adds for the cut away view of installation diagram in kind
Width, and step is made, while corresponding atomization process is done on flange, add black pad between adjacent lens flange
Or spacer ring eliminates veiling glare.In figure 180 be assembling black lens barrel；170 be the cmos sensor of 13,000,000 pixels.
Embodiment 2
A kind of mobile lens module using annular aperture diffraction optical element involved in the present invention, its annular region
The left side curved surface that diffractive optical surfaces can also be disposed in proximity to the last a piece of lens of image space position (does not consider infrared absorption filter
Wave plate, the face second from the bottom of last a piece of lens) on, it is to build-up tolerance (such as eccentric, inclination, thickness error) and face type
Error is also insensitive, though the machining accuracy of diffraction surfaces micro-structural exist error (the slight rounding in saw tooth like microstructures edge or
Person misplaces), the influence to overall imaging effect is also little, as described in the present embodiment 2.
The structure chart of embodiment 2 is as shown in Figure 9.From the object side to the image side, its structure and embodiment 1 are substantially similar, simply
Diffraction optics face is positioned close on the left side curved surface of last piece lens of image space position.Its respectively by 5 plastic lens,
Respectively the 1st lens 210, the 2nd lens 220, the 3rd lens 230, the 4th lens 240, the 5th 250,1, lens are red
Outer filter plate 260, and sensor 270 form.
From the object side to the image side, the 1st described lens 210 are until the 4th lens 240 are all non-spherical lens.Described
1st lens 210, it is meniscus；The 2nd described lens 220, it is concavo-concave lens；The 3rd described lens
230, it is the lens that two faces in left and right are all wavy curved surface；The 4th described lens 240, it is concave-convex lens.
The 5th described lens 250, i.e., close to image space position last a piece of lens, its be middle concave, to edge slowly
Become convex diffraction lens.It is arranged to the diffraction optics of annular aperture close to first face of object space, i.e. left side curved surface 251
Face, it is the type of binary face 3 (Binary 3), and its aperture is provided with two regions：Border circular areas 251A within diameter D1, and
Diameter D1 to the outer ring annular region 251B between diameter D2.Border circular areas 251A within described diameter D1, it is radially
Border circular areas within coordinate 1.575mm, the ratio for accounting for the full aperture size of the left side curved surface 251 are 0.8, and it is common
Optical aspherical surface (non-diffraction face).Described outer ring annular region 251B, it is the annulus beyond radial coordinate 1.575mm
Domain, it is diffraction surfaces, its be periodic distribution, size in the other single order saw tooth like microstructures of wavelength level, it is used for introducing additional
Phase, the aberration and off-axis aberration of the peripheral field of optical system are corrected, make the imaging of whole picture all relatively more clear
It is clear.Its right is common optical aspherical surface close to last the right curved surface 252 of image planes；
Described infrared filter 260, its material are glass, and its front and rear surfaces is plated with dielectric film, and it is through visible
Light, and infrared ray is filtered；Described sensor 270, it is the cmos image sensor of 13,000,000 pixels.
A kind of mobile lens module using annular aperture diffraction optical element described in the present embodiment 2, described optics
The parameter such as system, type, radius of curvature, optical thickness, material, diameter and the circular cone coefficient in each of which face such as table below
Shown in 4：
The optical system parameter of the embodiment 2 of form 4.
The face of 211 faces described in the present embodiment 2~242, and 252 faces asphericity coefficient as shown in following table 5：
The face of 211 faces described in form 5.~242, and 252 asphericity coefficient
The 5th described lens 250, its left side curved surface 251, the diffraction term coefficient of its type of binary face 3 (Binary 3) and
Described in the following form 6 of aspherical surface data：
The 5th lens 250 described in form 6., the left side 251, the diffraction term system of its type of binary face 3 (Binary 3)
Number (phase coefficient) and asphericity coefficient：
Can be seen that in form 6：The left side curved surface 251, the outer ring annular region 251B, its periodic micro- knot
Structure diffraction surfaces, only it is provided with a phase coefficient：P2^2 phase coefficient β21：- 3798.3803, and other advanced coefficients are whole
For 0, can so ensure the phase fluctuation of its diffraction surfaces than shallower, so that it is guaranteed that the cycle of diffraction surfaces saw tooth like microstructures and
Sawtooth Level Change is all relatively more continuous and slow, it is ensured that diffraction lens Ultra-precision Turning and the yield rate of injection.
Embodiment 3
Kind involved in the present invention is using the mobile lens module of annular aperture diffraction optical element, described optical system
System, it can be the optical system of 6 plastic lens.The diffractive optical surfaces of its annular region can also be disposed in proximity to picture
The second from the bottom lens that orientation is put the right curved surface (do not consider infrared filter, second from the bottom lens of image space it is last
On simultaneously), it is also insensitive to build-up tolerance (such as eccentric, inclination, thickness error) and face type error, even if diffraction surfaces are micro-
There is error (the slight rounding in saw tooth like microstructures edge or dislocation) in the machining accuracy of structure, to overall imaging effect
Influence is also little, as described in the present embodiment 3.
A kind of mobile lens module using annular aperture diffraction optical element involved in the present invention, embodiment 3
Structure chart is as shown in Figure 10.From the object side to the image side, it is respectively by 6 plastic lens, respectively the 1st lens 310, the 2nd thoroughly
360,1 mirror 320, the 3rd lens 330, the 4th lens 340, the 5th lens 350, the 6th lens infrared filter 370,
And sensor 380 forms.
From the object side to the image side, the 1st described lens 310 are until the 4th lens 340, and the 6th lens 360 are all
Non-spherical lens, the described the 5th lens 350 are then the diffraction optical lens of annular aperture.
The 1st described lens 310, it is convex-convex lens；The 2nd described lens 320, it is meniscus；It is described
The 3rd lens 330, its be the 1st face be wavy curved surface, the 2nd face be convex surface；The 4th described lens 340, it is bumps
Lens；The 6th described lens 360, it is that centre is recessed, slowly becomes convex non-spherical lens to edge.
The 5th described lens 350, it is recessed optical aspherical surface close to the 1st face of object space, i.e. left side curved surface 351；
Its 2nd face, i.e. the right curved surface 352 is convex, annular aperture diffraction optics face, and it is the type of binary face 3 (Binary 3),
Its aperture is provided with two regions：Border circular areas 352A within diameter D1, and diameter D1 are annular to the outer ring between diameter D2
Region 352B.Border circular areas 352A within described diameter D1, it is the circle within radial coordinate 1.3083878mm
Domain, the ratio for accounting for the full aperture size of the right curved surface 352 is about 0.7, and it is common optical aspherical surface (non-diffraction face).
Described outer ring annular region 352B, it is the annular region beyond radial coordinate 1.3083878mm, and it is diffraction surfaces, and it is
Periodic distribution, size are in the other single order saw tooth like microstructures of wavelength level, and it is used for introducing additive phase, to optical system
The aberration and off-axis aberration of peripheral field are corrected, and make the imaging of whole picture all than more visible.
Described infrared filter 370, its material are glass, and its front and rear surfaces is plated with dielectric film, and it is through visible
Light, and infrared ray is filtered；Described sensor 380, it is the cmos image sensor of 16,000,000 pixels.
A kind of mobile lens module using annular aperture diffraction optical element described in the present embodiment 3, described optics
The parameter such as system, type, radius of curvature, optical thickness, material, diameter and the circular cone coefficient in each of which face such as table below
Shown in 7：
The optical system parameter of the embodiment 3 of form 7.
The face of 311 faces described in the present embodiment 3~351, and the asphericity coefficient in 361,362 faces, as shown in following table 8：
The face of 311 faces described in the embodiment 3 of form 8.~351, and the asphericity coefficient in 361,362 faces
The 5th described lens 350, its right curved surface 352, the diffraction term coefficient of its type of binary face 3 (Binary 3) and
Described in the following form 9 of aspherical surface data：
The 5th lens 350 described in the embodiment 3 of form 9., the right curved surface 352, its type of binary face 3 (Binary3)
Diffraction term coefficient (phase coefficient) and asphericity coefficient：
It can be seen that from form 9：A kind of Mobile phone mirror using annular aperture diffraction optical element involved in the present invention
Head mould group, left side curved surface 351 described in embodiment 3, the border circular areas 351A within the diameter D1, its to be common aspherical,
Diffraction term coefficient is not provided with, its all phase coefficient, i.e. p1^2~p1^8 coefficient all 0.
The outer ring annular region 351B, its periodic micro-structural diffraction surfaces, only it is provided with two phase coefficients：p2^2
Phase coefficient β21：8618.318 and p2^4 phase coefficient β22：- 203260, and other advanced coefficients all 0, this
Sample can ensure the phase fluctuation of its diffraction surfaces than shallower, so that it is guaranteed that the cycle of diffraction surfaces saw tooth like microstructures and sawtooth
Level Change is all relatively more continuous and slow, it is ensured that diffraction lens Ultra-precision Turning and the yield rate of injection.
The asphericity coefficient in two other region is also only provided with 4：a11~a14, and a21~a24.Whole curved surface compares
Gently, close to sphere, greatly reduce by diffraction surfaces saw tooth like microstructures mismachining tolerance, and caused by rigging error
Susceptibility, so as to improve the yield rate of mobile lens module.
A kind of mobile lens module using annular aperture diffraction optical element involved in the present invention, embodiment 3
Design index path is as shown in figure 11, and its optics overall length is 4.61804mm.Its point range figure is as shown in figure 12；Its curvature of field and distortion are such as
Shown in Figure 13, the aberration control of optical system is within 3%；Its modulation transfer function (MTF) curve is as shown in figure 14, from 0~
1 all visual fields, when spatial frequency is 160 line pair, most resolution ratio control is more than 0.5；Its axial MTF curve
(i.e. depth of focus) is as shown in figure 15.
Embodiment 4
A kind of mobile lens module using annular aperture diffraction optical element involved in the present invention, described optical system
System, it can be the optical system of 7 plastic lens.The diffractive optical surfaces of its annular region can also be disposed in proximity to picture
The second from the bottom lens that orientation is put left side curved surface (do not consider infrared filter, the first of second from the bottom lens of image space
Face) on, it is also insensitive to build-up tolerance (such as eccentric, inclination, thickness error) and face type error, even if the micro- knot of diffraction surfaces
There is error (the slight rounding in saw tooth like microstructures edge or dislocation) in the machining accuracy of structure, to the shadow of overall imaging effect
Sound is also little, as described in the present embodiment 4.
A kind of mobile lens module using annular aperture diffraction optical element involved in the present invention, embodiment 4
Structure chart is as shown in figure 16.From the object side to the image side, it is respectively by 7 plastic lens, respectively the 1st lens 410, the 2nd thoroughly
Mirror 420, the 3rd lens 430, the 4th lens 440, the 5th lens 450, the 6th lens 460, the 7th 470,1, lens are red
Outer filter plate 480, and sensor 490 form.
From the object side to the image side, the 1st described lens 410 are until the 5th lens 450, and the 7th lens 470 are all
Non-spherical lens；The 6th described lens 460 are then the diffraction optical lens of annular aperture.
The 1st described lens 410, it is meniscus；The 2nd described lens 420, it is meniscus；It is described
The 3rd lens 430, its be the 1st face be wavy curved surface, the 2nd face is convex surface；The 4th described lens 440, it is bumps
Lens；The 5th described lens 450, it is concave-convex lens；The 6th described lens 460, it is concavo-convex diffraction lens；
The 7th described lens 470, it is middle concave, slowly becomes convex non-spherical lens to edge.
The 6th described lens 460, its 1st face, i.e. left side curved surface 461 are the diffraction optics face of recessed annular aperture,
It is the type of binary face 3 (Binary 3), and its aperture is provided with two regions：Border circular areas 461A within diameter D1, and diameter
D1 to the outer ring annular region 461B between diameter D2.Border circular areas 461A within described diameter D1, it is radial coordinate
Border circular areas within 1.0665116mm, the ratio for accounting for the full aperture size of left side curved surface 461 is about 0.7, and it is common light
Learn in aspherical (non-diffraction face).Described outer ring annular region 461B, it is the annular beyond radial coordinate 1.0665116mm
Region, it is diffraction surfaces, its be periodic distribution, size in the other single order saw tooth like microstructures of wavelength level, it is used for introducing attached
Add phase, the aberration and off-axis aberration of the peripheral field of optical system are corrected, make the imaging of whole picture all relatively more clear
It is clear.The 6th described lens 460, its right curved surface 462 are convex aspherical.
Described infrared filter 480, its material are glass, and its front and rear surfaces is plated with dielectric film, and it is through visible
Light, and infrared ray is filtered；Described sensor 490, it is the cmos image sensor of 20,000,000 pixels.
A kind of mobile lens module using annular aperture diffraction optical element described in the present embodiment 4, described optics
The parameter such as system, type, radius of curvature, optical thickness, material, diameter and the circular cone coefficient in each of which face such as table below
Shown in 10：
The optical system parameter of the embodiment 4 of form 10.
The face of 411 faces described in the present embodiment 4~452, and the asphericity coefficient in 471,472 faces, as shown in following table 11：
The face of 411 faces described in the embodiment 4 of form 11.~452, and the asphericity coefficient in 471,472 faces：
The 6th described lens 460, its left side curved surface 461, the diffraction term coefficient of its type of binary face 3 (Binary 3) and
Described in the following form 12 of aspherical surface data：
The 6th lens 460 described in form 12., the left side curved surface 461, the diffraction of its type of binary face 3 (Binary 3)
Term coefficient (phase coefficient) and asphericity coefficient：
It can be seen that from form 12：The left side curved surface 461, the outer ring annular region 461B, it is periodically micro-
Structure diffraction face, only it is provided with two phase coefficients：P2^2 phase coefficient β21：- 1168.97, and p2^4 phase coefficient
β22：40971.46, and other advanced coefficients all 0, it can so ensure the phase fluctuation of its diffraction surfaces than shallower, from
And ensure that the cycle of diffraction surfaces saw tooth like microstructures and sawtooth Level Change are all relatively more continuous and slow, it is ensured that diffraction lens surpasses
Precision Machining and the yield rate of injection.
A kind of mobile lens module using annular aperture diffraction optical element involved in the present invention, embodiment 4
Design index path is as shown in figure 17, and its optics overall length is 4.68078mm.Its point range figure is as shown in figure 18；Its curvature of field and distortion are such as
Shown in Figure 19, the aberration control of optical system is within 4%；Its modulation transfer function (MTF) curve is as shown in figure 20, from 0
~1 all visual fields, when spatial frequency is 130 line pair, the resolution ratio of all visual fields is controlled more than 0.5；Its axial MTF
Curve (i.e. depth of focus) is as shown in figure 21.
Described above is only the preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, without departing from the technical principles of the invention, some improvement and deformation can also be made, these improve and become
Shape also should be regarded as protection scope of the present invention.
Claims (16)
- A kind of 1. mobile lens module using annular aperture diffraction optics, it is characterised in that including：From the object side to the image side successively Coaxially arranged at least 5 lens, infrared fileter, sensors；In at least 5 lens, close to the last a piece of lens of image space Or a side surface of second from the bottom lens is arranged to the diffraction optics face with annular aperture.
- 2. the mobile lens module of annular aperture diffraction optics is used as claimed in claim 1, it is characterised in that described tool There is the diffraction optics face of annular aperture, it is the type of binary face 3, and its aperture is arranged to two regions, the border circular areas of internal aperture For non-diffraction face, the outer ring annular region in its outer aperture is diffraction surfaces.
- 3. the mobile lens module of annular aperture diffraction optics is used as claimed in claim 2, it is characterised in that the exit orifice The outer ring annular region in footpath, it is 0.7 or more than 0.8 region of eyeglass full aperture.
- 4. the mobile lens module of annular aperture diffraction optics is used as claimed in claim 2, it is characterised in that including：From 5 lens that object space is sequentially coaxially arranged to image space, be designated as respectively the 1st lens, the 2nd lens, the 3rd lens, the 4th thoroughly Mirror, the 5th lens, for the described the 1st lens until the 4th lens section is non-spherical lens, the described the 1st lens are convex-concave Lens；The 2nd described lens are concavo-concave lens；The 3rd described lens are that two faces in left and right are the saturating of wavy curved surface Mirror；The 4th described lens are concave-convex lens, and the described the 5th lens are middle concave, centre gradually becomes convex spread out to edge Penetrate lens.
- 5. the mobile lens module of annular aperture diffraction optics is used as claimed in claim 4, it is characterised in that the described 5th One face of piece lens is non-diffraction face, and another face is the diffraction optics face with annular aperture；Spreading out with annular aperture Penetrate on optical surface, the outer ring annular region in outer aperture is more than 0.8 region of eyeglass full aperture.
- 6. the mobile lens module of annular aperture diffraction optics is used as claimed in claim 4, it is characterised in that described to have On the diffraction optics face of annular aperture, the outer ring annular region is periodic micro-structural diffraction surfaces, only two phase systems Number：P2^2 phase coefficient β21, and p2^4 phase coefficient β22, other advanced coefficients all 0.
- 7. the mobile lens module of annular aperture diffraction optics is used as claimed in claim 4, it is characterised in that the described 1st Piece lens, the 2nd lens, the 3rd lens, the 4th lens, the 5th lens are altogether plastic lens in mutual piece lens, or Two panels is glass lens, and three are plastic lens.
- 8. the mobile lens module of annular aperture diffraction optics is used as claimed in claim 2, it is characterised in that including：From 6 lens that object space is sequentially coaxially arranged to image space, be designated as respectively the 1st lens, the 2nd lens, the 3rd lens, the 4th thoroughly Mirror, the 5th lens, the 6th lens, the described the 1st lens are until the 4th lens and the 6th lens are all aspherical Mirror, the described the 1st lens are convex-convex lens；The 2nd described lens are meniscus；The 3rd described lens are close to thing First face of side is wavy curved surface, and second face of opposite side is convex surface；The 4th described lens are concave-convex lens, institute The 6th lens stated are middle concave, centre gradually becomes convex non-spherical lens to edge, and the described the 5th lens are close to thing First face of side is recessed optical aspherical surface, and second face of opposite side is diffraction optics face that is convex, having annular aperture.
- 9. the mobile lens module of annular aperture diffraction optics is used as claimed in claim 8, it is characterised in that the described 5th One face of piece lens is non-diffraction face, and another face is the diffraction optics face with annular aperture, has spreading out for annular aperture Penetrate on optical surface；The outer ring annular region in outer aperture is more than 0.7 region of eyeglass full aperture.
- 10. the mobile lens module of annular aperture diffraction optics is used as claimed in claim 8, it is characterised in that the tool Have on the diffraction optics face of annular aperture, the outer ring annular region is periodic micro-structural diffraction surfaces, is only provided with one Phase coefficient：P2^2 phase coefficient β21, other advanced coefficients all 0.
- 11. the mobile lens module of annular aperture diffraction optics is used as claimed in claim 8, it is characterised in that the described 1st Piece lens, the 2nd lens, the 3rd lens, the 4th lens, the 5th lens, the 6th lens are altogether plastics in six-element lens Lens, or two panels are glass lens, and four are plastic lens.
- 12. the mobile lens module of annular aperture diffraction optics is used as claimed in claim 2, it is characterised in that including：From 7 lens that object space is sequentially coaxially arranged to image space, be designated as respectively the 1st lens, the 2nd lens, the 3rd lens, the 4th thoroughly Mirror, the 5th lens, the 6th lens, the 7th lens, the described the 1st lens are until the 5th lens and the 7th lens section For non-spherical lens, the described the 1st lens are meniscus；The 2nd described lens are meniscus；Described the 3rd Lens are wavy curved surface close to first face of object space, and second face of opposite side is convex surface；The 4th described lens are recessed Convex lens, the described the 5th lens are concave-convex lens, the described the 7th lens be middle concave, it is middle gradually become to edge it is convex Non-spherical lens, the described the 6th lens are the recessed diffraction optics face with annular aperture close to first face of object space, Second face of opposite side is convex optical aspherical surface.
- 13. the mobile lens module of annular aperture diffraction optics is used as claimed in claim 12, it is characterised in that described the One face of 6 lens is non-diffraction face, and another face is the diffraction optics face with annular aperture；Spreading out with annular aperture Penetrate on optical surface, the outer ring annular region in outer aperture is more than 0.7 region of eyeglass full aperture.
- 14. the mobile lens module of annular aperture diffraction optics is used as claimed in claim 12, it is characterised in that the tool Have on the diffraction optics face of annular aperture, the outer ring annular region is periodic micro-structural diffraction surfaces, and there is provided two phases Potential coefficient：P2^2 phase coefficient β21, and p2^4 phase coefficient β22, other advanced coefficients all 0.
- 15. the mobile lens module of annular aperture diffraction optics is used as claimed in claim 12, it is characterised in that described the 1 lens, the 2nd lens, the 3rd lens, the 4th lens, the 5th lens, the 6th lens, the 7th lens totally seven lens In, it is plastic lens, or four are glass lens, three are plastic lens.
- 16. the mobile lens module using annular aperture diffraction optics as any one of claim 1-15, its feature It is, described infrared filter material is glass, and its front and rear surfaces is plated with dielectric film, and it passes through visible ray, and will be red Outside line is filtered；Described sensor is cmos image sensor.
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| CN201711088341.9A CN107894655B (en) | 2017-11-07 | 2017-11-07 | Mobile phone lens module adopting annular aperture diffraction optics |
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|---|---|---|---|
| CN201711088341.9A CN107894655B (en) | 2017-11-07 | 2017-11-07 | Mobile phone lens module adopting annular aperture diffraction optics |
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| WO2021170417A1 (en) | 2020-02-27 | 2021-09-02 | Carl Zeiss Ag | Compact telephoto lens having diffractive optical element |
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