CN207557565U - A kind of mobile lens module using annular aperture diffraction optics - Google Patents

Abstract

The utility model belongs to optical image technology field, discloses a kind of mobile lens module using annular aperture diffraction optics, including：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 set as 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 utility model, it is far from aperture diaphragm, it is insensitive to build-up tolerance and face type error, even if the machining accuracy of diffraction surfaces micro-structure, there are slight errors, the influence to whole 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

A kind of mobile lens module using annular aperture diffraction optics

Technical field

The utility model belongs to optical image technology field, is related to a kind of mobile lens using annular aperture diffraction optics Module.

Background technology

With the fast development of smart mobile phone industry, mobile phone imaging lens module from initial hundreds of thousands pixel develop to 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 is also continuously improved, and the requirement of assembly precision and concentricity is also higher and 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.It is different according to sensor used, at present Up to 80 °~90 °, aperture 2.8~2.1 or so, camera lens overall length is less than 6mm at more than 10000000 pixel mobile phone lens full filed angles, It is shortest or even 4 points several.Existing 10,000,000 pixel mobile phone lens use 5P (plastics), 2G (Glass) 3P more Or more (Plastics), the structure of eyeglass.Eyeglass number is more, and structure is complex.

Compared to all using the optical system of refractor, the use of diffraction optical lens in imaging systems can be into one 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.The diffraction optical lens are on aspherical or spherical surface surface, pass through ultraprecise Processing or the method for etching carve out periodic distribution, size in the other single order of wavelength level or multistage saw tooth like microstructures, For introducing additive phase, aberration and wave difference to optical system compensate, and especially aberration and off-axis aberration are corrected special It is effective.

Patent US9341857B2 proposes a kind of mobile lens module of 4 glass lens for being provided with diffraction optical lens, As shown in Figure 1.Its second face r2 surface in first lens is provided with diffraction optics face (DOE, i.e. diffractive Optical element), optics overall length is substantially reduced, greatly improves image quality and modulation transfer function, design knot Fruit is very perfect.But this structure there are it is fairly obvious the problem of：1. the hole of the diffraction optics identity distance from forefront in second face Diameter diaphragm (Stop) is too near, to build-up tolerance (as it is eccentric, tilt, thickness error) and face type error susceptibility very Height, any rigging error can all generate the imaging of entire visual field and seriously affect.2. since diffraction surfaces are filled with entire optics table Face, the face type error of any saw tooth like microstructures, zigzag micro- knot very harsh to the requirement on machining accuracy of diffraction surfaces micro-structure The local misalignment of the slight rounding in structure edge or saw tooth like microstructures can all introduce veiling glare, zero-order terms and twin-image (such as image planes There is bright spot in centre) or other multiorder diffractive hot spots (for example ghost image occur in image planes), amplify it using several eyeglasses below Afterwards, the influence to entire optical system imaging is extremely serious.3. diffraction optics face employs Advanced Diffraction coefficient, B1~B7 Coefficient all has setting, and from the axle center of lens to edge, the phase fluctuation of diffraction surfaces is very fast, causes diffraction surfaces zigzag micro- The period of structure and sawtooth Level Change are very fast, the difficulty of micro-structure processing are increased, even if the design result of optical system It is very perfect, but the limitation of precision is subject to processing, cause its yield rate very low, imaging effect is deteriorated instead.

In addition the patent US7375907B2 of Hong Hai groups also proposed a kind of 3 plastics for being provided with diffraction optical lens Eyeglass.Diffraction optics face is provided on its concave surface in first face of second, there is also it is also significant that problem：1. the The concave surface of two mirrors is closer from nearly aperture diaphragm, to processing and build-up tolerance (such as eccentric, inclination, thickness error and face Type error) susceptibility it is very high, any rigging error all can to the imaging of entire visual field generate seriously affect.2. diffraction surfaces fill Entire optical surface is expired, the face type of any saw tooth like microstructures very harsh to the requirement on machining accuracy of diffraction surfaces micro-structure Error, the rounding of jagged edges or dislocation can all introduce veiling glare, zero-order terms and twin-image or other multiorder diffractive hot spots.3. spread out It penetrates optical surface and employs Advanced Diffraction coefficient, p2~p10 term coefficients all have setting, the i.e. phase fluctuation of diffraction surfaces very Soon, period and the sawtooth Level Change for leading to diffraction surfaces saw tooth like microstructures are very fast, even if the design result of optical system is non- It is often perfect, but the limitation of precision is subject to processing, its yield rate is caused to be also can be very low.

Invention content

(1) goal of the invention

The purpose of this utility model is：A kind of mobile lens module using annular aperture diffraction optics is provided, in structure On the basis of simplification, yield rate and imaging effect are improved.

(2) technical solution

In order to solve the above-mentioned technical problem, the utility model provides a kind of mobile lens using annular aperture diffraction optics Module, including：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, the diffraction with annular aperture is set as close to the last a piece of lens of image space or a side surface of second from the bottom lens Optical surface.

(3) advantageous effect

The mobile lens module using annular aperture diffraction optics that above-mentioned technical proposal is provided has following apparent Advantage：

1. since diffractive optical surfaces are disposed in proximity on last a piece of or second from the bottom lens of image planes, far from hole Diameter diaphragm, it is insensitive to build-up tolerance (such as eccentric, inclination, thickness error) and face type error, even if diffraction surfaces micro-structure Machining accuracy is there are slight errors, and the slight rounding of face type error, jagged edges such as saw tooth like microstructures or dislocation are right The influence of whole imaging effect is also little.

2. under normal circumstances, 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.It is missed to ensure that the visual field within 0.7 band is not processed by diffraction micro structural The influence of difference, for example veiling glare or zero-order terms and twin-image, diffraction optical lens used by the utility model, aperture is set as Inside and outside two regions, the two regions are believed with the position of 0.7 or 0.8 ratio of full aperture for line of demarcation, internal aperture border circular areas, Remain common optical aspherical surface (non-diffraction face)；And a circle annular region in outer aperture is then set as diffraction surfaces, is served only for Image space 0.7 is corrected with off-axis aberration in addition.The mismachining tolerance susceptibility in diffraction optics face can be greatly reduced in this way, improved The yield rate of mobile phone imaging lens module.

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 utility model embodiment 1.

Fig. 3 is the index path of mobile lens module in the utility model embodiment 1.

Fig. 4 is the point range figure of mobile lens module in the utility model embodiment 1.

Fig. 5 is the curvature of field and distortion figure of mobile lens module in the utility model embodiment 1.

Fig. 6 is the modulation transfer function curve of mobile lens module in the utility model embodiment 1.

Fig. 7 is axial MTF curve (depth of focus) figure of mobile lens module in the utility model embodiment 1.

Fig. 8 is the cut away view in kind of mobile lens module in the utility model embodiment 1.

Fig. 9 is the structure principle chart of mobile lens module in the utility model embodiment 2.

Figure 10 is the structure principle chart of mobile lens module in the utility model embodiment 3.

Figure 11 is the index path of mobile lens module in the utility model embodiment 3.

Figure 12 is the point range figure of mobile lens module in the utility model embodiment 3.

Figure 13 is the curvature of field and distortion figure of mobile lens module in the utility model embodiment 3.

Figure 14 is the modulation transfer function curve of mobile lens module in the utility model embodiment 3.

Figure 15 is axial MTF curve (depth of focus) figure of mobile lens module in the utility model embodiment 3.

Figure 16 is the structure principle chart of mobile lens module in the utility model embodiment 4.

Figure 17 is the index path of mobile lens module in the utility model embodiment 4.

Figure 18 is the point range figure of mobile lens module in the utility model embodiment 4.

Figure 19 is the curvature of field and distortion figure of mobile lens module in the utility model embodiment 4.

Figure 20 is the modulation transfer function curve of mobile lens module in the utility model embodiment 4.

Figure 21 is axial MTF curve (depth of focus) figure of mobile lens module in the utility model embodiment 4.

Specific embodiment

To make the purpose of this utility model, content and advantage clearer, with reference to the accompanying drawings and examples, to this reality It is described in further detail with novel specific embodiment.

Based on the shortcomings of the prior art, the utility model proposes a kind of hands using annular aperture diffraction optical element Machine camera lens module is made of 5 or more lens, 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, for 3 type of binary face (Binary 3), aperture are set Two regions are set as, the border circular areas of internal aperture is common optical aspherical surface (non-diffraction face)；One circle in its outer aperture Annular region is then diffraction surfaces.The annular region in outer aperture, for the region other than the 0.7 or 0.8 of eyeglass full aperture.Looping pit The diffraction optics face of diameter is mainly used to correct peripheral field 0.7 with off-axis aberration (dispersion, astigmatism, coma) in addition, improves and adjusts Modulation trnasfer function (MTF) increases 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 by the utility model, 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, respectively by 5 plastic lens, respectively the 1st lens 110, the 2nd lens 120, the 3rd lens 130, the 4th lens 140th, 150,1 infrared filter 160 of the 5th lens and sensor 170 form.

From the object side to the image side, the 1st lens 110 are until the 4th lens 140 are all non-spherical lens.Described 1st lens 110, are meniscus；2nd lens 120 are concavo-concave lens；3rd lens 130, It is the lens that two faces in left and right are all wavy curved surface；4th lens 140, are concave-convex lens.

5th lens 150 for middle concave, slowly become convex diffraction lens 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., set close to the right curved surface 152 of image space The diffraction optics face of annular aperture is set to, is 3 type of binary face (Binary 3), aperture is set there are two region：Diameter D1 with Interior border circular areas 152A and diameter D1 to the outer ring annular region 152B between diameter D2.Within the diameter D1 Border circular areas 152A is the border circular areas within radial coordinate 1.848mm, accounts for the ratio of the full aperture size of the curved surface 152 It is 0.8, is common optical aspherical surface (non-diffraction face).The outer ring annular region 152B, is radial coordinate Annular region other than 1.848mm is diffraction surfaces, micro- in the other single order zigzag of wavelength level for periodic distribution, size Structure is used for introducing additive phase, the aberration and off-axis aberration of the peripheral field of optical system is corrected, make entirely to draw The imaging in face is all than more visible.

The infrared filter 160, material are glass, and front and rear surfaces are plated with dielectric film, through visible Light, and infrared ray is filtered；The sensor 170 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, the optics System, the parameters such as type, radius of curvature, optical thickness, material, diameter and the circular cone coefficient in each of which face such as table 1 below It is shown：

1. optical system parameter of table

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 table 2.~151

The face of 111 face~115 it is aspherical, curved surface rise is as described in the following formula (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, is the inverse of radius of curvature.

5th lens 150, close to image space the right curved surface 152 be annular aperture diffraction optics face, face Type is 3 type of binary face (Binary 3), and a circle annular region in outer aperture is then wavelength level, periodic micro-structure diffraction Described in face, diffraction term coefficient and the following table 3 of aspherical surface data：

The 5th lens 150 described in table 3., the diffraction term coefficient (phase coefficient) and aspheric of the right curved surface 152 Face coefficient：

3 type of binary face (Binary 3), curved surface rise and phase distribution refer to following formula (2)~public affairs Formula (5)：

Border circular areas 152A within the diameter D1, aspherical rise are represented by lower change formula (2)：

In formula, z₁Curved surface rise for the border circular areas 152A within diameter D1；R is radial coordinate；a_1iRespectively even Item r²ⁱCoefficient, shown in detailed data reference table 3；k₁Circular cone coefficient for border circular areas 152A；c₁For border circular areas The curvature of 152A 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, curved surface rise：

In formula, z₁For diameter D1 to the curved surface rise of the outer ring annular region 152B between diameter D2；z₀For initial rise, It is the z that is obtained in formula (2) as r=A1₁Value；R is radial coordinate；a_2iRespectively even order terms r²ⁱCoefficient, in detail number According to shown in reference table 3；k₂Circular cone coefficient for annular region 152B；c₂It is curvature for the curvature of outer ring annular region 152B The inverse of radius.

The right curved surface 152, the border circular areas 152A and outer ring annular region 152B within diameter D1 have independent Phase distribution, for the border circular areas 152A within diameter D1, phase distribution such as the following formula (4) represents：

In formula, Φ₁Phase distribution for the border circular areas 152A within diameter D1；ρ₁For normalized radial coordinate, i.e. phase Position；β_1iFor even order terms phase multinomial ρ₁ ²ⁱCoefficient, shown in detailed data reference table 3；M₁For spreading out for border circular areas 152A Series is penetrated, since the region is not provided with diffraction optics face, only common aspherical, which is set as 0.

For diameter D1 to the outer ring annular region 152B between diameter D2, the phase distribution in diffraction optics face is for example following Formula (5) represents：

In formula, Φ₂For diameter D1 to the phase distribution of the outer ring annular region 152B between diameter D2；δ₀It is initial for phase Value is when radial coordinate r is in A₁The Φ obtained during position according to formula (4)₁Value；ρ₂For normalized radial coordinate, i.e. phase Position, here normalized radial coordinate A₂It is set as 10；β_2iRespectively even order terms multinomial ρ₂ ²ⁱCoefficient, detailed data ginseng It examines shown in table 3；M₂For the diffraction progression of outer ring annular region 152B, this specific embodiment setting M₂Be 1, i.e. its wavelength Only there are one steps for the zigzag micro-structure of grade.

It can be seen that from table 3：The right curved surface 152, the outer ring annular region 152B, periodic micro- knot Structure diffraction surfaces, only two phase coefficients：The phase coefficient β of p2^2₂₁：39484.163 the and phase coefficient β of p2^4₂₂：- 499328.92, and other advanced coefficients all 0, it can ensure the phase fluctuation of its diffraction surfaces in this way than shallower, so as to really Period and the sawtooth Level Change for protecting diffraction surfaces saw tooth like microstructures are all relatively more continuous and slow, it is ensured that diffraction lens ultraprecise adds Work and the yield rate of injection.

A kind of mobile lens module using annular aperture diffraction optical element involved by the utility model, embodiment 1 design index path is 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 such as Shown in Fig. 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, 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 by the utility model, embodiment 5 plastic lens 110,120,130,140,150 as shown in figure 8, described, flange are schemed in cuing open for 1 installation diagram in kind Widen, and make step, while corresponding atomization process is done on flange, added black gasket between adjacent lens flange Or spacer ring eliminates veiling glare.The 180 black lens barrel for assembling in figure；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 by the utility model, annulus The left side curved surface that the diffractive optical surfaces in domain can also be disposed in proximity to the last a piece of lens of image space position (does not consider infrared Filter plate, the face second from the bottom of last a piece of lens) on, 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-structure there are error (the slight rounding in saw tooth like microstructures edge or Person misplaces), the influence to whole 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, structure and embodiment 1 are substantially similar, only Diffraction optics face is positioned close on the left side curved surface of last piece lens of image space position.It by 5 plastic lens, divides respectively Not Wei the 1st lens 210, the 2nd lens 220, the 3rd lens 230, the 4th lens 240, the 5th lens it is 250,1 infrared Filter plate 260 and sensor 270 form.

From the object side to the image side, the 1st lens 210 are until the 4th lens 240 are all non-spherical lens.Described 1st lens 210, are meniscus；2nd lens 220 are concavo-concave lens；3rd lens 230, It is the lens that two faces in left and right are all wavy curved surface；4th lens 240, are concave-convex lens.

5th lens 250 are middle concave that is, close to the last a piece of lens of image space position, to edge slowly Become convex diffraction lens.Its first face close to object space, i.e. left side curved surface 251 are set as the diffraction optics of annular aperture Face, is 3 type of binary face (Binary 3), and aperture is set there are two region：Border circular areas 251A, Yi Jizhi within diameter D1 Diameter D1 to the outer ring annular region 251B between diameter D2.Border circular areas 251A within the diameter D1, radially to sit The border circular areas within 1.575mm is marked, the ratio for accounting for the full aperture size of the left side curved surface 251 is 0.8, is common optics Aspherical (non-diffraction face).The outer ring annular region 251B is the annular region other than radial coordinate 1.575mm, For diffraction surfaces, be periodic distribution, size in the other single order saw tooth like microstructures of wavelength level, be used for introducing additive phase, The aberration and off-axis aberration of the peripheral field of optical system are corrected, make the imaging of entire picture all than more visible.It is right While the last one the right curved surface 252 close to image planes is common optical aspherical surface；

The infrared filter 260, material are glass, and front and rear surfaces are plated with dielectric film, through visible Light, and infrared ray is filtered；The sensor 270 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, the optics System, the parameters such as type, radius of curvature, optical thickness, material, diameter and the circular cone coefficient in each of which face such as table 4 below It is shown：

The optical system parameter of 4. embodiment 2 of table

The asphericity coefficient in the face of 211 faces described in the present embodiment 2~242 and 252 faces is as shown in following table 5：

The face of 211 faces described in table 5.~242 and 252 asphericity coefficient

5th lens 250, left side curved surface 251, the diffraction term coefficient of 3 type of binary face (Binary 3) and Described in the following table 6 of aspherical surface data：

The 5th lens 250 described in table 6., the left side 251, the diffraction term system of 3 type of binary face (Binary 3) Number (phase coefficient) and asphericity coefficient：

It can be seen that from table 6：The left side curved surface 251, the outer ring annular region 251B, periodic micro- knot Structure diffraction surfaces are only provided with a phase coefficient：The phase coefficient β of p2^2₂₁：- 3798.3803, and other advanced coefficients are whole Be 0, can ensure the phase fluctuation of its diffraction surfaces in this way than shallower, so that it is guaranteed that the period 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

A kind of mobile lens module using annular aperture diffraction optical element involved by the utility model, the light System can be the optical system of 6 plastic lens.The diffractive optical surfaces of its annular region can also be disposed in proximity to The right curved surface of second from the bottom lens of image space position (does not consider infrared filter, second from the bottom lens of image space are most One side afterwards) on, it is also insensitive to build-up tolerance (such as eccentric, inclination, thickness error) and face type error, even if diffraction surfaces are micro- The machining accuracy of structure is there are error (the slight rounding in saw tooth like microstructures edge or dislocation), to the shadow of whole imaging effect Sound is also little, as described in the present embodiment 3.

A kind of mobile lens module using annular aperture diffraction optical element involved by the utility model, embodiment 3 structure chart is as shown in Figure 10.From the object side to the image side, respectively by 6 plastic lens, respectively the 1st lens 310, the 2nd 360,1 lens 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 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.

1st lens 310, are convex-convex lens；2nd lens 320, are meniscus；It is described The 3rd lens 330, be the 1st face be wavy curved surface, the 2nd face is convex surface；4th lens 340, for bumps Lens；6th lens 360 are that centre is recessed, slowly becomes convex non-spherical lens to edge.

5th lens 350, close to the 1st face of object space, i.e. left side curved surface 351 is recessed optical aspherical surface； Its 2nd face, i.e. the right curved surface 352 are convex, annular aperture diffraction optics face, are 3 type of binary face (Binary 3), Aperture is set there are two region：Border circular areas 352A and diameter D1 within diameter D1 are to the outer ring annulus between diameter D2 Domain 352B.Border circular areas 352A within the diameter D1 is the border circular areas within radial coordinate 1.3083878mm, The ratio for accounting for the full aperture size of the right curved surface 352 is about 0.7, is common optical aspherical surface (non-diffraction face).It is described Outer ring annular region 352B, be radial coordinate 1.3083878mm other than annular region, be diffraction surfaces, be the period Property distribution, size in the other single order saw tooth like microstructures of wavelength level, be used for introducing additive phase, the edge of optical system regarded The aberration and off-axis aberration of field are corrected, and make the imaging of entire picture all than more visible.

The infrared filter 370, material are glass, and front and rear surfaces are plated with dielectric film, through visible Light, and infrared ray is filtered；The sensor 380 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, the optics System, the parameters such as type, radius of curvature, optical thickness, material, diameter and the circular cone coefficient in each of which face such as table 7 below It is shown：

The optical system parameter of 7. embodiment 3 of table

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 8. embodiment 3 of table~351 and the asphericity coefficient in 361,362 faces

5th lens 350, the right curved surface 352, the diffraction term coefficient of 3 type of binary face (Binary 3) and Described in the following table 9 of aspherical surface data：

The 5th lens 350 described in embodiment 3 of table 9., the right curved surface 352,3 type of binary face (Binary 3) Diffraction term coefficient (phase coefficient) and asphericity coefficient：

Curved surface type：	3 type of binary face
		2 radius of curvature of region	-3.70577
2 circular cone coefficient of region	0.561317
		1 radial coordinate of region (A1)	1.308388
2 radial coordinate of region	10
		1 diffraction progression of region	0
2 diffraction progression of region	1
		Sine(delta 0)	-0.00448
Offset	0
		Maximal term	4
Asphericity coefficient (a of r1^211)	0.008886
		Phase coefficient (the β of p1^211)	0
Asphericity coefficient (a of r2^221)	0.008755
		Phase coefficient (the β of p2^221)	8618.318
Asphericity coefficient (a of r1^412)	-0.0077
		Phase coefficient (the β of p1^412)	0
Asphericity coefficient (a of r2^422)	-0.00352
		Phase coefficient (the β of p2^422)	-203260
Asphericity coefficient (a of r1^613)	0.004268
		Phase coefficient (the β of p1^613)	0
Asphericity coefficient (a of r2^623)	0.000714
		Phase coefficient (the β of p2^623)	0
Asphericity coefficient (a of r1^814)	-0.00065
		Phase coefficient (the β of p1^814)	0
Asphericity coefficient (a of r2^824)	0.000173
		Phase coefficient (the β of p2^824)	0

It can be seen that from table 9：A kind of hand using annular aperture diffraction optical element involved by the utility model Machine camera lens module, left side curved surface 351 described in embodiment 3, the border circular areas 351A within the diameter D1 are common aspheric Face is not provided with diffraction term coefficient, the coefficient all 0 of all phase coefficients, i.e. p1^2~p1^8.

The outer ring annular region 351B, periodic micro-structure diffraction surfaces are only provided with two phase coefficients：p2^2 Phase coefficient β₂₁：8618.318 the and phase coefficient β of p2^4₂₂：- 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 period of diffraction surfaces saw tooth like microstructures and sawtooth are high It is all relatively more continuous and slow to spend change, it is ensured that diffraction lens Ultra-precision Turning and the yield rate of injection.

The asphericity coefficient in other two region is also only provided with 4：a₁₁~a₁₄And a₂₁~a₂₄.Entire curved surface compares Gently, it close to spherical surface, greatly reduces by quick caused by diffraction surfaces saw tooth like microstructures mismachining tolerance and rigging error Sensitivity, so as to improve the yield rate of mobile lens module.

A kind of mobile lens module using annular aperture diffraction optical element involved by the utility model, embodiment 3 design index path is as shown in figure 11, and optics overall length is 4.61804mm.Its point range figure is as shown in figure 12；Its curvature of field and distortion 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 by the utility model, the light System can be the optical system of 7 plastic lens.The diffractive optical surfaces of its annular region can also be disposed in proximity to Second from the bottom lens of image space position left side curved surface (do not consider infrared filter, the of second from the bottom lens of image space It is also insensitive to build-up tolerance (such as eccentric, inclination, thickness error) and face type error on one side), even if the micro- knot of diffraction surfaces The machining accuracy of structure is there are error (the slight rounding in saw tooth like microstructures edge or dislocation), the influence to whole imaging effect Also less, as described in the present embodiment 4.

A kind of mobile lens module using annular aperture diffraction optical element involved by the utility model, embodiment 4 structure chart is as shown in figure 16.From the object side to the image side, respectively by 7 plastic lens, respectively the 1st lens 410, the 2nd Lens 420, the 3rd lens 430, the 4th lens 440, the 5th lens 450, the 6th lens 460, the 7th 470,1, lens Infrared filter 480 and sensor 490 form.

From the object side to the image side, the 1st lens 410 are until the 5th lens 450 and the 7th lens 470 are all Non-spherical lens；6th lens 460 are then the diffraction optical lens of annular aperture.

1st lens 410, are meniscus；2nd lens 420, are meniscus；It is described The 3rd lens 430, be wavy curved surface for the 1st face, the 2nd face is convex surface；4th lens 440, for bumps Lens；5th lens 450, are concave-convex lens；6th lens 460, for concave-convex diffraction lens；Institute The 7th lens 470 stated for middle concave, slowly become convex non-spherical lens to edge.

6th lens 460, the 1st face, i.e. left side curved surface 461 are the diffraction optics face of recessed annular aperture, It is 3 type of binary face (Binary 3), and aperture is set there are two region：Border circular areas 461A and diameter within diameter D1 D1 to the outer ring annular region 461B between diameter D2.Border circular areas 461A within the diameter D1, 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, is common light It learns in aspherical (non-diffraction face).The outer ring annular region 461B is the annulus other than radial coordinate 1.0665116mm Domain is diffraction surfaces, be periodic distribution, size in the other single order saw tooth like microstructures of wavelength level, be used for introducing additional Phase corrects the aberration and off-axis aberration of the peripheral field of optical system, makes the imaging of entire picture all than more visible. 6th lens 460, the right curved surface 462 are convex aspherical.

The infrared filter 480, material are glass, and front and rear surfaces are plated with dielectric film, through visible Light, and infrared ray is filtered；The sensor 490 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, the optics System, the parameters such as 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 10. embodiment 4 of table

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 11. embodiment 4 of table~452 and the asphericity coefficient in 471,472 faces：

6th lens 460, left side curved surface 461, the diffraction term coefficient of 3 type of binary face (Binary 3) and Described in the following table 12 of aspherical surface data：

The 6th lens 460 described in table 12., the left side curved surface 461, the diffraction of 3 type of binary face (Binary 3) Term coefficient (phase coefficient) and asphericity coefficient：

It can be seen that from table 12：The left side curved surface 461, the outer ring annular region 461B are periodically micro- Structure diffraction face is only provided with two phase coefficients：The phase coefficient β of p2^2₂₁：The phase coefficient of -1168.97 and p2^4 β₂₂：40971.46, and other advanced coefficients all 0, it can ensure the phase fluctuation of its diffraction surfaces in this way than shallower, so as to Ensure that period 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 by the utility model, embodiment 4 design index path is as shown in figure 17, and optics overall length is 4.68078mm.Its point range figure is as shown in figure 18；Its curvature of field and distortion 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 direction MTF is bent Line (i.e. depth of focus) is as shown in figure 21.

The above is only the preferred embodiment of the utility model, it is noted that for the common skill of the art For art personnel, under the premise of the utility model technical principle is not departed from, several improvement and deformation can also be made, these change The scope of protection of the utility model is also should be regarded as into deformation.

Claims (16)

1. a kind of mobile lens module using annular aperture diffraction optics, which is characterized 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 set as the diffraction optics face with annular aperture.

2. the mobile lens module of annular aperture diffraction optics is used as described in claim 1, which is characterized in that the tool There is the diffraction optics face of annular aperture, be 3 type of binary face, aperture is set as two regions, the border circular areas of internal aperture For non-diffraction face, the outer ring annular region in outer aperture is diffraction surfaces.

3. the mobile lens module of annular aperture diffraction optics is used as claimed in claim 2, which is characterized in that the exit orifice The outer ring annular region of diameter is 0.7 or more than 08 region of eyeglass full aperture.

4. the mobile lens module of annular aperture diffraction optics is used as claimed in claim 2, which is characterized in that including：From 5 lens that object space is sequentially coaxially arranged to image space, be denoted 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 are all non-spherical lens, the described the 1st lens are convex-concave Lens；2nd lens are concavo-concave lens；3rd lens are that two faces in left and right are all the saturating of wavy curved surface Mirror；4th lens are concave-convex lens, and the described the 5th lens are middle concave, centre becomes convex by wash rice to edge and spreads out Penetrate lens.

5. the mobile lens module of annular aperture diffraction optics is used as claimed in claim 4, which is characterized in that the described 5th One face of piece lens is non-diffraction face, another face is the diffraction optics face with annular aperture；Spreading out with annular aperture It penetrates 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, which is characterized in that described to have On the diffraction optics face of annular aperture, the outer ring annular region be periodic micro-structure diffraction surfaces, only two phase systems Number：The phase coefficient β of p2^2₂₁And the phase coefficient β of p2^4₂₂, other advanced coefficients all 0.

7. the mobile lens module of annular aperture diffraction optics is used as claimed in claim 4, which is characterized in that the described 1st Piece lens, the 2nd lens, the 3rd lens, the 4th lens, the 5th lens are in totally five lens, be plastic lens or Two panels is glass lens, and three pieces are plastic lens.

8. the mobile lens module of annular aperture diffraction optics is used as claimed in claim 2, which is characterized in that including：From 6 lens that object space is sequentially coaxially arranged to image space, be denoted 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；2nd lens are meniscus；3rd lens are close to object First face of side is wavy curved surface, and second face of opposite side is convex surface；4th lens be 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 object 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, which is characterized in that the described 5th One face of piece lens is non-diffraction face, another face is the diffraction optics face with annular aperture, has spreading out for annular aperture It penetrates 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, which is characterized in that the tool Have on the diffraction optics face of annular aperture, the outer ring annular region is periodic micro-structure diffraction surfaces, is only provided with one Phase coefficient：The phase coefficient β of p2^2₂₁, other advanced coefficients all 0.

11. the mobile lens module of annular aperture diffraction optics is used as claimed in claim 8, which is characterized in that the described 1st Piece lens, the 2nd lens, the 3rd lens, the 4th lens, the 5th lens, the 6th lens are total in six-element lens, are plastics 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, which is characterized in that including：From 7 lens that object space is sequentially coaxially arranged to image space, be denoted 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 until the 5th lens and the 7th lens all For non-spherical lens, the described the 1st lens are meniscus；2nd 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；4th lens are recessed Convex lens, the described the 5th lens are concave-convex lens, the described the 7th lens are middle concave, it is intermediate gradually become to edge it is convex Non-spherical lens, the described the 6th lens close to first face of object space be the recessed diffraction optics face with annular aperture, 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, which is characterized in that described the One face of 6 lens is non-diffraction face, another face is the diffraction optics face with annular aperture；Spreading out with annular aperture It penetrates 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, which is characterized in that the tool Have on the diffraction optics face of annular aperture, the outer ring annular region is periodic micro-structure diffraction surfaces, and there is provided two phases Potential coefficient：The phase coefficient β of p2^2₂₁And the phase coefficient β of p2^4₂₂, other advanced coefficients all 0.

15. the mobile lens module of annular aperture diffraction optics is used as claimed in claim 12, which is characterized 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, be plastic lens or four it is glass lens, three pieces are plastic lens.

16. the mobile lens module using annular aperture diffraction optics as described in any one of claim 1-15, feature It is, the infrared filter material is glass, and front and rear surfaces are plated with dielectric film, through visible ray, and will be red Outside line is filtered；The sensor is cmos image sensor.