CN210072174U - Single-chip achromatic mobile phone lens - Google Patents
Single-chip achromatic mobile phone lens Download PDFInfo
- Publication number
- CN210072174U CN210072174U CN201921164847.8U CN201921164847U CN210072174U CN 210072174 U CN210072174 U CN 210072174U CN 201921164847 U CN201921164847 U CN 201921164847U CN 210072174 U CN210072174 U CN 210072174U
- Authority
- CN
- China
- Prior art keywords
- diffraction
- lens
- refraction
- achromatic
- focal length
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Lenses (AREA)
Abstract
The utility model belongs to the optics field, in particular to achromatism cell-phone camera lens, the problem that can not achromatism of single lens can not be proposed for solving conventional camera lens design in-process provides a monolithic achromatism cell-phone camera lens, there are two optical surfaces along the optical axis direction, two optical surfaces are coaxial, wherein the object side optical surface is the refracting surface, the image side optical surface is the diffraction plane, the refracting surface realizes the chromatic aberration correction through distributing focal power with the diffraction plane, combine together refracting surface or diffraction plane and phase encoding face, the sensitivity of monolithic formula refraction and diffraction mixed cell-phone camera lens to the wavelength has been reduced, the field angle of single lens has been increased, compare in traditional cell-phone camera lens and reduce volume and lens quantity, imaging quality has been guaranteed simultaneously, processing technology has been simplified, the debugging error has been reduced.
Description
Technical Field
The utility model belongs to the optics field, in particular to achromatism cell-phone camera lens.
Background
In the conventional lens design process, a single lens cannot be achromatized, usually by the dispersion characteristics of optical materials, a double cemented lens or three or more lenses are used, achromatization is realized by distributing optical power, other aberrations are corrected by using the thickness and curvature of the lens as the degrees of freedom, but the negative lens for compensating the positive lens chromatic aberration has the defect that the monochromatic aberration is enlarged and the numerical aperture is limited. Vodo et al in 2005 focused incident waves using a two-dimensional photonic crystal with equivalent negative refractive index, and a lens with negative refractive index has negative abbe number, and can realize achromatic characteristics while using the same material, but the negative refractive index materials are all artificial materials so far, and are difficult to be put into practical application in large scale.
The phase coding imaging technology is a technology for expanding the focal depth, which is proposed by Dowski and Cathey in the last 90 century, and a designed phase coding surface is added at the positions of a diaphragm, an entrance pupil and the like of an optical system to code incident light, so that a coded blurred image is obtained on an image surface, and a clear image can be obtained after restoration.
The design of the disclosed mobile phone lens adopts the principle of refraction imaging, a multi-lens structure is usually used for achromatization and field of view expansion, and the lens group is usually composed of 5 to 6 lenses, the more lenses are adopted in the mobile phone lens group, the more difficulty in processing and assembling is, and the thinner mobile phone is not facilitated.
SUMMERY OF THE UTILITY MODEL
The utility model provides a technical problem be: the problem of chromatic aberration cannot be solved by the single lens in the prior art. The technical scheme is as follows: a single-chip achromatic mobile phone lens is provided with an object side optical surface and an image side optical surface along the optical axis direction; the object side surface and the image side surface are coaxial, wherein the object side surface is a refraction surface, and the image side surface is a diffraction surface; the surface shape of the refraction surface comprises: spherical, aspherical, extended polynomial surfaces; the diffraction surface is a Fresnel ring belt structure formed by collapsing a spherical surface, an aspheric surface or a high-order aspheric surface; the refraction surface or the diffraction surface is superposed with a phase coding surface shape;
the focal power of the refraction surface and the diffraction surface satisfies:
wherein: the working wavelength range of the single-chip achromatic mobile phone lens is lambda1～λ3，λ2F' is the central wavelength of the working wavelength and is the lambda of the single-chip achromatic mobile phone lens2Of target focal length, f'difAnd f'refRespectively a diffraction surface and a refraction surface at a wavelength of lambda2The focal length of (a) is determined,
and
respectively a diffraction surface and a refraction surface at a wavelength of lambda1The focal length of (a) is determined,
and
respectively a diffraction surface and a refraction surface at a wavelength of lambda3The focal length of time.
The working principle is as follows: the diffraction surface and the refraction surface realize achromatism by distributing focal power, the phase coding surface is added on the basis of the single refraction and diffraction mixed lens to make up the defect that the focal depth of the single refraction and diffraction mixed lens is short and the field of view is small, and meanwhile, in order to not increase the number of lenses, the phase coding surface is combined with the diffraction surface to construct a phase coding refraction and diffraction mixed lens, so that the field of view is enlarged while chromatic aberration is eliminated.
Optionally, a single-piece achromatic mobile phone lens includes an object-side surface and an image-side surface; wherein the object side optical surface is a refraction surface, and the image side optical surface is a diffraction surface; the surface shape of the refraction surface comprises: spherical, aspherical, extended polynomial surfaces; the diffraction surface is a Fresnel ring belt structure formed by collapsing a spherical surface, an aspheric surface or a high-order aspheric surface; and the refraction surface or the diffraction surface is superposed with a phase coding surface shape.
Optionally, the phase encoding surface is a cubic encoding surface, where the surface equation of the cubic encoding surface is Z- ξ (x)3+y3)/R3Wherein ξ is a cubic phase encoding coefficient, R is an encoding element radius, x, y are base coordinates of a phase encoding plane, ξ > 10 λ2. In a traditional optical system, the spatial information is lost due to the defocusing amount, and the insensitivity of the optical system to defocusing can be greatly weakened by adding the phase coding surface, so that the focal depth and the field of view of the system are enlarged.
Optionally, the surface shape equation of the refraction surface is:
wherein: r is the distance from any point on the refracting surface to the optical axis, k is the conic coefficient, c is the curvature of the vertex of the refracting surface, N is the maximum order of the polynomial, AiIs coefficient of an expansion polynomial of the i-th term, x1，y1Is the base coordinate of the refracting surface, Ei(x1，y1) Is at x1，y1The directional power series can combine the phase coding surface with the refraction surface shape by using an expansion aspheric surface shape, and the achromatic mobile phone lens of single-chip phase coding is realized.
Optionally, the refraction surface is an even aspheric surface, and a surface equation thereof is:
r is the distance from any point on the refracting surface to the optical axis, k is the conic coefficient, c is the curvature of the aspheric vertex α1、α2、α3、α4、α5、α6、α7、α8The even-order aspheric surface is a parameter of the even-order aspheric surface, and compared with the spherical surface, the even-order aspheric surface can correct aberration, so that the final imaging quality is improved, the image quality is ensured, and meanwhile, the field angle of the mobile phone lens is enlarged.
Optionally, the sagittal height equation of the diffraction surface is
Wherein f isdifIs the focal length of the diffraction surface, n is the refractive index of the diffraction surface material, p is the Fresnel zone number, λ2For the incident center wavelength, p is 1,2,3, … …, x2，y2The base coordinates of the diffraction surface zones.
Optionally, the diffraction surface is a combination of a phase encoding surface and a fresnel zone surface, and the surface rise equation is
Wherein R is1Is the radius of the diffraction surface, n is the refractive index of the diffraction surface material, fdifIs the focal length of the diffraction plane, λ2The Fresnel zone can be combined with the phase coding surface to realize the single-chip achromatic mobile phone lens with a large field of view.
Due to the application of the technology, compared with the prior art, the utility model has the following advantages:
1. the utility model discloses a monolithic formula achromatism cell-phone camera lens passes through refracting surface and diffraction surface distribution focal power, because the negative power of diffraction surface can realize the achromatism of monolithic camera lens in F, d, C wave band.
2. The utility model discloses a monolithic formula achromatism cell-phone camera lens is through adding the phase coding face, through carrying out the phase coding regulation and control to the incident light, can make the camera lens insensitive to the wavelength, although MTF (transfer modulation function) of camera lens reduce, the phase coding image that obtains is fuzzy, but as long as be greater than 0 just can restore into clear image through using appropriate filter function with the image that obtains, has enlarged the angle of view simultaneously.
3. The utility model discloses a monolithic formula achromatism cell-phone camera lens satisfies the parameter requirement of present mainstream cell-phone camera lens, adopts the design of monolithic structure to compare and has reduced camera lens quantity in prior art, has reduced the installation degree of difficulty, has realized the big visual field achromatism's of broadband characteristic simultaneously.
Drawings
FIG. 1 is a schematic diagram of a single piece achromatic handset lens;
FIG. 2 is a diagram of a dot arrangement of an F optical band of a mobile phone lens with a phase encoding surface combined with an even aspheric surface;
FIG. 3 is a diagram showing a dot arrangement of the optical band of a mobile phone lens in which a phase encoding surface is combined with an even aspheric surface;
FIG. 4 is a diagram of a dot arrangement of the optical band of a mobile phone lens C with a phase encoding surface combined with an even aspheric surface;
FIG. 5 is a radial cross-sectional view of a phase Fresnel zone;
fig. 6 is a radial cross-sectional view of a phase encoding surface in combination with a fresnel zone.
Detailed Description
The invention will be further described with reference to the following drawings and examples:
the first embodiment is as follows:
a single-piece achromatic mobile phone lens, as shown in FIG. 1, includes an object-side surface 1 and an image-side surface 2; wherein the object side optical surface is a refraction surface, and the image side optical surface is a diffraction surface; the surface shape of the refraction surface comprises: spherical, aspherical, extended polynomial surfaces; the diffraction surface is a Fresnel ring belt structure formed by plane, spherical surface, aspheric surface or high-order aspheric surface collapse; and the refraction surface or the diffraction surface is superposed with a phase coding surface shape.
The specific single-chip achromatic mobile phone lens is designed on the basis of the above disclosure, and comprises a refraction surface and a diffraction surface, wherein the refraction surface is a combination of an even aspheric surface and a phase encoding surface, the refraction surface is an extended polynomial surface, the diffraction surface is a Fresnel zone, and the design parameters of the mobile phone lens are that the focal length f is 5.4mm, and the caliber D is 3 mm.
In order to obtain parameters of the refraction surface and the diffraction surface, the design wavelengths are F (486nm) and d (587nm)) And C (656nm) wavelength, the requirement of using refraction-diffraction mixing achromatization is
Wherein f isdifIs the focal length of the diffraction surface at the time of d light incidence, frefIs the focal length of the refracting surface at the time of d-ray incidence, gammadifIs the Abbe number of the diffraction surface, is prepared fromλ1Is F light, λ2Is d light, λ3Is C light to obtain gammadif-3.45, the refractive surface material is BK7, refractive index n1＝1.5168，γref63.167, the focal length f of the refractive surfaceref5.69mm, and the focal length of the diffraction surface is fref＝105.84mm。
The surface shape formula of the cubic phase plate isWherein
α is the coding coefficient, in this shot we take α ═ 40 pi, λ2At incident central wavelength, λ2Since n is 0.000587, n is the refractive index of the phase encoding element substrate material, n is 1.5168, R is the encoding element radius, and R is 1.5, the coefficient of the cubic phase plate is set to
Combining the cubic phase plate with the refraction surface, and after optimization, the formula of the surface shape of the refraction surface is as follows:
wherein x1And y1Respectively the base coordinates of the refracting surfaces.
The rise equation for the diffraction plane is:
Table 1 shows the lens design parameter table of the first embodiment
Fig. 2 to 4 are graphs of point spread functions at different incidence angles when the incident wavelengths are respectively an F-band (486nm), a d-band (587nm) and a C (656nm), and it can be seen that the shapes of the point spread functions are not changed basically until a half field angle is 15 degrees, which verifies that the phase coding refraction and diffraction hybrid mobile phone lens can realize monolithic large-field imaging.
FIG. 5 is a radial cross-sectional view of a Fresnel zone, resulting in a Fresnel lens having a height of 1.14 μm and a centrally symmetric configuration.
Example two:
the specific single-chip achromatic mobile phone lens is designed on the basis of the above disclosure, and comprises a refraction surface and a diffraction surface, wherein the refraction surface is an even aspheric surface, the diffraction surface is formed by combining a Fresnel zone and a phase coding surface, and the design parameters of the mobile phone lens are that the focal length f is 5.4mm, and the caliber D is 3 mm.
The requirement of obtaining parameters of refraction surface and diffraction surface and using refraction-diffraction mixing achromatization under the designed wavelengths of F (486nm), d (587nm) and C (656nm) is that
Wherein f isdifIs the focal length of the diffraction plane, frefIs the focal length of the refracting surface, gammaaifIs the Abbe number of the diffraction surface,
λ1is F light, λ2Is d light, λ3Is C light to obtain gammadif-3.45, the refractive surface material is BK7, refractive index n1＝1.5168，γref63.167, the focal length of the refracting surfacefref5.69mm, and the focal length of the diffraction surface is fref＝105.84mm。
The surface shape formula of the even aspheric surface is as follows:
The diffraction surface is formed by combining a Fresnel zone and a phase encoding surface, and the rise of the Fresnel zone is as follows:
FIG. 6 is a radial cross-sectional view of the phase encoding surface combined with the Fresnel zone, wherein the axial cross-sectional view of the phase encoding surface combined with the Fresnel zone is asymmetric because the third order phase plate is asymmetric, and the height of the diffraction surface is 1.14 μm, which meets the condition of the photolithography process.
Monolithic formula achromatism cell-phone camera lens be based on phase coding's refraction and diffraction mix cell-phone camera lens, the chromatic aberration of visible light wave band has been eliminated through refracting and diffracting mixed structure design, add phase coding face on this basis, it is insensitive to make lens formation of image out of focus, enlarge the formation of image angle of vision, the mode that the simultaneous design combined together phase coding face and refracting surface or diffraction face, realize the formation of image of big visual field when monolithic camera lens achromatism under the condition that does not influence the formation of image result, compare in the quantity that traditional cell-phone camera lens has reduced the camera lens, the production equipment degree of difficulty has been reduced, be favorable to the frivolous design of future cell-phone.
Claims (6)
1. A single-chip achromatic mobile phone lens is provided with an object side optical surface and an image side optical surface along the optical axis direction; the object side surface and the image side surface are coaxial, and the optical system is characterized in that: wherein the object side optical surface is a refraction surface, and the image side optical surface is a diffraction surface; the surface shape of the refraction surface comprises: spherical, aspherical, extended polynomial surfaces; the diffraction surface is a Fresnel ring belt structure formed by collapsing a spherical surface, an aspheric surface or a high-order aspheric surface; the refraction surface or the diffraction surface is superposed with a phase coding surface shape;
the focal power of the refraction surface and the diffraction surface satisfies:wherein: the working wavelength range of the single-chip achromatic mobile phone lens is lambda1～λ3，λ2F' is the central wavelength of the working wavelength and is the lambda of the single-chip achromatic mobile phone lens2Of target focal length, f'difAnd f'refRespectively a diffraction surface and a refraction surface at a wavelength of lambda2The focal length of the lens when in use,
and
respectively a diffraction surface and a refraction surface at a wavelength of lambda1The focal length of (a) is determined,
and
respectively a diffraction surface and a refraction surface at a wavelength of lambda3The focal length of time.
2. The single-piece achromatic handset lens of claim 1, wherein said phase-coded surface equation is Z- ξ (x)3+y3)/R3Where ξ is the phase encoding coefficient, R is the phase encoding radius, x, y are the phase encoded base coordinates, ξ>10λ2。
3. The monolithic achromatic handset lens of claim 1, wherein: the surface shape equation of the refraction surface is as follows:
wherein: r is the distance from any point on the refracting surface to the optical axis, k is the conic coefficient, c is the curvature of the vertex of the refracting surface, N is the maximum order of the polynomial, AiIs coefficient of an expansion polynomial of the i-th term, x1，y1Is the base coordinate of the refracting surface, Ei(x1,y1) Is at x1，y1Power series of directions.
4. The monolithic achromatic handset lens of claim 3, wherein: the refraction surface is an even aspheric surface, and the surface equation is as follows:
r is the distance from any point on the refracting surface to the optical axis, k is the conic coefficient, c is the curvature of the aspheric vertex α1、α2、α3、α4、α5、α6、α7、α8Are parameters of even aspheric surfaces.
5. The monolithic achromatic handset lens of claim 1, wherein: the sagittal height equation of the diffraction surface is
Wherein f isdifIs the focal length of the diffraction surface, n is the refractive index of the diffraction surface material, p is the Fresnel zone number, λ2For the incident center wavelength, p is 1,2,3, … …, x2，y2The base coordinates of the diffraction surface zones.
6. The monolithic achromatic handset lens of claim 1, wherein: superimposing a phase-encoded surface profile on said diffraction surface, the surface thereofThe plane rise equation is
Wherein R is1Radius of the diffraction plane, fdifIs the focal length of the diffraction plane, λ2And p is the number of fresnel zones on the diffraction surface, p is 1,2,3, … …, and x and y are the base coordinates of the diffraction surface in the zone.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921164847.8U CN210072174U (en) | 2019-07-23 | 2019-07-23 | Single-chip achromatic mobile phone lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921164847.8U CN210072174U (en) | 2019-07-23 | 2019-07-23 | Single-chip achromatic mobile phone lens |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210072174U true CN210072174U (en) | 2020-02-14 |
Family
ID=69429582
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921164847.8U Active CN210072174U (en) | 2019-07-23 | 2019-07-23 | Single-chip achromatic mobile phone lens |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210072174U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110286473A (en) * | 2019-07-23 | 2019-09-27 | 苏州大学 | A kind of one chip achromatism mobile lens |
| CN111561682A (en) * | 2020-05-18 | 2020-08-21 | 广东烨嘉光电科技股份有限公司 | Automobile headlamp lens and design method thereof |
| CN113281830A (en) * | 2021-05-19 | 2021-08-20 | 烟台艾睿光电科技有限公司 | Lens and optical lens |
-
2019
- 2019-07-23 CN CN201921164847.8U patent/CN210072174U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110286473A (en) * | 2019-07-23 | 2019-09-27 | 苏州大学 | A kind of one chip achromatism mobile lens |
| CN111561682A (en) * | 2020-05-18 | 2020-08-21 | 广东烨嘉光电科技股份有限公司 | Automobile headlamp lens and design method thereof |
| CN113281830A (en) * | 2021-05-19 | 2021-08-20 | 烟台艾睿光电科技有限公司 | Lens and optical lens |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN210072174U (en) | Single-chip achromatic mobile phone lens | |
| CN104297901B (en) | Image capturing lens assembly and image capturing device | |
| CN103592740B (en) | Image capturing system set | |
| TWI801635B (en) | Optical imaging lens | |
| CN103676098B (en) | Optical image capturing lens assembly | |
| CN107272144A (en) | Optical imaging system | |
| CN107272143A (en) | Optical imaging system | |
| CN107797226A (en) | Optical imaging system | |
| CN107765407A (en) | Optical imaging system | |
| CN106680967A (en) | Optical imaging system | |
| CN107153250A (en) | Optical imaging system | |
| CN107632379A (en) | Small-sized ultra-large aperture starlight level ultra-wide angle zoom lens | |
| CN103502869A (en) | Objective optical system | |
| CN107765395A (en) | Optical imaging system | |
| CN217639612U (en) | Compound lens, optical system comprising same, imaging device and electronic equipment | |
| CN106338810A (en) | Optical imaging system | |
| CN107656355A (en) | Optical imaging system | |
| CN106842498A (en) | Optical imaging system | |
| CN107272145A (en) | Optical imaging system | |
| CN107797227A (en) | Optical imaging system | |
| CN107153253A (en) | Optical imaging system | |
| WO2021007930A1 (en) | Micro imaging lens for short-distance imaging | |
| CN110286473A (en) | A kind of one chip achromatism mobile lens | |
| CN107272146A (en) | Optical imaging system | |
| CN117331194A (en) | Optical imaging lens |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |