CN117706738B - External long-focus lens of folding and super-mixing mobile phone - Google Patents
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Abstract
The invention discloses a folding and supermixing external tele lens of a mobile phone, which specifically comprises the following components: the two conventional refraction lenses and the two superlenses are a first refraction lens, a second refraction lens, a first superlens and a second superlens in sequence from an object plane to an image plane along the optical axis direction; through the combination of the refraction lens and the superlens, the external lens of the mobile phone is more compact and lighter in structure, meanwhile, as the superlens has higher high degree of freedom, the display effect of the lens can be further improved, the overall performance of the lens is improved, the generation difficulty can be reduced, and the production cost is reduced.
Description
Technical Field
The invention relates to the technical field of optical imaging, in particular to an external tele lens of a folding and supermixing mobile phone.
Background
A tele lens generally has a long focal length so that it can photograph a long-distance subject and enlarge it into a picture, but accordingly, the number of lenses and the total length of an optical system required for the tele lens tend to be higher than those of a normal lens, which makes miniaturization of the tele lens a difficult task.
Along with development of scientific technology, a mobile phone has become an indispensable tool in daily life, and a photographing function of the mobile phone is a very important function, however, as the mobile phone has higher requirements on portability and compactness, the design space of a mobile phone lens is not large, the focal length of a main photographing lens of the mobile phone is about 6mm, long-distance clear imaging cannot be realized under a smaller volume, but the requirement of people on photographing capability is always increased, so that a small-sized long-focus lens capable of being used for photographing of the mobile phone is gradually required for the current market, but the long-focus lens has the characteristic of having a narrow field of view, is not suitable for being used as a conventional camera of the mobile phone, and is a product which is most suitable for the market requirement of the mobile phone, and is a detachable external long-focus lens of the mobile phone.
The superlens is one of the new technologies which are emerging in recent years, the superlens with reasonable design can randomly regulate and control electromagnetic waves on a small plane, a new thought is given to miniaturization and integration of an optical system, the design theory and processing capacity of a diffraction optical element are greatly improved in recent years, the superlens has mass capacity, the superlens is combined with a conventional refraction lens, and the tele lens can be greatly miniaturized, so that a feasible thought is provided for an external tele lens of a mobile phone.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides the folded and super-mixed mobile phone external tele lens, which is more compact and lighter in structure through the mixed use of the refraction lens and the super lens, successfully reduces the number of lenses required by the tele lens into four lenses, controls the total length within 30mm, has good imaging effect, can reduce the production difficulty while improving the overall performance of the lens, reduces the production cost, and is sufficient for meeting the market demands in this aspect.
The specific technical scheme of the invention comprises a refraction and supermixing type mobile phone external tele lens, wherein the lens comprises two conventional refraction lenses, and the two superlenses are sequentially a first refraction lens, a second refraction lens, a first superlens and a second superlens from an object plane to an image plane along the optical axis direction; the first refractive lens has positive focal power, the surface of the first refractive lens close to the object plane is a convex surface, and the surface of the first refractive lens close to the image plane is a concave surface; the second refractive lens has negative focal power, the surface of the second refractive lens close to the object plane is a convex surface, and the surface of the second refractive lens close to the image plane is a concave surface; the first superlens has positive focal power, the surface of the first superlens, which is close to the object plane, is a structural plane, and the surface of the first superlens, which is close to the image plane, is a plane; the second superlens has negative focal power, the surface of the second superlens close to the object plane is a structural plane, and the surface of the second superlens close to the image plane is a plane; and the focal length of the first refractive lens is f 1 The focal length of the second refractive lens is f 2 Both satisfy |f 2 |＜f 1 ＜|2f 2 I (I); the focal length of the first superlens is f 3 The focal length of the second superlens is f 4 Both satisfy |2f 4 |＜f 3 ＜|3f 4 |。
Further, the radius of curvature of the surface of the first refractive lens close to the object side is R 1011 The curvature radius of the surface near the image side is R 1012 Both are full ofFoot relationship:
4.0＜R 1012 /R 1011 ＜8.2。
further, the radius of curvature of the surface of the second refractive lens close to the object side is R 1021 The curvature radius of the surface near the image side is R 1022 The two satisfy the relation:
2.3＜R 1021 /R 1022 ＜2.8。
further, the first refractive lens has a thickness d 1 After which the air distance is a 1 The second refractive lens has a thickness d 2 After which the air distance is a 2 These parameters satisfy the relationship:
（d 1 +a 1 ）＞（d 2 +a 2 ）。
further, the first superlens has a thickness d 3 After which the air distance is a 3 The thickness of the second superlens is d 4 After which the air distance is a 4 These parameters satisfy the relationship:
（a 3 +d 3 ）＞（d 4 +a 4 ）
further, the relation between the system focal length F and the system total length L is as follows:
1.5F＜L＜2.5F。
further, the first refractive lens has a refractive index n 1 The refractive index of the second refractive lens is n 2 The refractive index of the first super lens is n 3 The refractive index of the second superlens is n 4 These parameters satisfy:
1.50＜n 1 ＜1.75；1.50＜n 3 ＜1.75；1.70＜n 2 ＜2.0；1.70＜n 4 ＜2.0。
the invention has the following beneficial effects: compared with the prior art, the invention has the advantages that the system has higher degree of freedom, the lens can realize better display effect, the volume can be made more compact, the quality is lighter, the cost is lower after the mass production of the superlens, and the stability is better, so that the additional lens is lighter, the price is lower, and the market demand is met.
Drawings
Fig. 1 is a lens schematic diagram of an external tele lens of a hybrid mobile phone described in the application.
Fig. 2 is a light path diagram of an external tele lens of a mobile phone according to a first embodiment of the present disclosure.
Fig. 3 is an MTF diagram of an external tele lens of a mobile phone disclosed in the first embodiment of the present application.
Fig. 4 is a speckle size diagram of an external tele lens of a mobile phone according to a first embodiment of the present disclosure.
Fig. 5 is a vertical axis chromatic aberration diagram of an external tele lens of a mobile phone disclosed in the first embodiment of the present application.
Fig. 6 is a light path diagram of an external tele lens of a mobile phone according to a second embodiment of the present disclosure.
Fig. 7 is an MTF diagram of an external tele lens of a mobile phone according to a second embodiment of the present disclosure.
Fig. 8 is a speckle size diagram of an external tele lens of a mobile phone according to a second embodiment of the present disclosure.
Fig. 9 is a vertical axis chromatic aberration diagram of an external tele lens of a mobile phone according to a second embodiment of the present disclosure.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The imaging quality of the lens can be judged through the MTF value and the speckle size diagram, as shown in fig. 3 and 7, the MTF is a modulation transfer function of the lens, the X-axis of the MTF represents the spatial frequency, namely, how many black-white line pairs are contained in each mm scale, the Y-axis of the MTF represents the function value corresponding to the transfer function, and when the function value is greater than 0.2, the black-white line pairs can be obviously distinguished under the corresponding spatial frequency, namely, the imaging effect is good. Fig. 4 and 8 are graphs of diffuse spot sizes, which show the sizes of light converging points in different fields of view on a reference plane, wherein RMS is a root mean square size, and represents the calculated value of root mean square for all the light falling points, GEO is a geometric maximum size, and represents the farthest size of the light from the center position, wherein RMS size is more accurate than GEO size, and when RMS size is smaller than 2 pixels, it means that the light in the same field of view can be better converged on one pixel, that is, the imaging effect is good.
Referring to fig. 1, the present invention includes 2 refractive lenses and 2 superlenses, which are sequentially a first refractive lens 101, a second refractive lens 102, a first superlens 201, a second superlens 202, a lens entrance pupil 301, and a mobile phone sensor302 along the optical axis direction from the object plane to the image plane. After passing through the four lenses 101-202, external light enters the lens of the mobile phone through the entrance pupil 301 of the mobile phone, and finally forms a clear image on the sensor302.
Assuming a cell phone detector size of 1/2. Inch, 1220 ten thousand pixels, a pixel pitch of 1.55um, using the method of the present invention provides a tele lens with a focal length of 12mm and a FOV of 50 °.
Example 1
The FOV of this lens is 50 °, the focal length F is 12mm, and the total length of the system is 20mm.
The parameters of each surface of the lens are shown in table 1:
TABLE 1
It should be noted that the "thickness" represents the distance from each face to the next, and this value represents the lens thickness between the left and right surfaces of the same lens; this value represents the distance between the two lenses between the surfaces of the different lenses.
Table 1 describes the microstructured side of the superlens in binary terms, which is equivalent from the principle that: the phase change that occurs after light passes through the entire surface is represented by a polynomial:，
wherein the phase difference is accumulated for the light rays, N is the number of polynomial coefficients in the series, is the coefficient of the power of ρ, ρ is the normalized radial aperture coordinates, and M is the diffraction order. Binary face polynomial parameter A of example 1 i Listed in table 2:
TABLE 2
Specifically, the focal length f of the first refractive lens 101 1 =42.96 mm, focal length f of second refractive lens 102 2 = -34.28mm, focal length f of first superlens 3 The focal length f of the second superlens = 310.87mm 4 =-113.02mm，|f 1 /f 2 |=1.25，|f 3 /f 4 |=2.75；
Specifically, the radius of curvature of the surface of the first refractive lens near the object side is R 1011 =19.72 mm, the radius of curvature of the surface near the image side is R 1012 =161.12mm，R 1012 /R 1011 =8.17；
Specifically, the radius of curvature of the surface of the second refractive lens close to the object side is R 1021 =43.41 mm, the radius of curvature of the surface near the image side is R 1022 =17.65mm，R 1021 /R 1022 =2.46；
Specifically, the first refractive lens has a thickness d 1 =5 mm, after which the air distance is a 1 =5.65 mm, second refractive lens thickness d 2 =5 mm, after which the air distance is a 2 =0.54mm，d 1 +a 1 =10.65mm，d 2 +a 2 =5.54mm；
Specifically, the thickness of the first superlens is d 3 =1 mm, after which the air distance is a 3 =1.18 mm, a second superlens thickness d 4 =1 mm, after which the air distance is a 4 =0.56mm，a 3 +d 3 =2.28mm，d 4 +a 4 =1.56mm；
Specifically, the focal length of the system is f=12 mm, and the total length of the system is l=20 mm;
specifically, the refractive lens surface is spherical, wherein the first refractive lens material has a refractive index n 1 Optical glass=1.52, the second refractive lens material is refractive index n 2 Optical glass=1.96, the first superlens material is refractive index n 3 Optical glass=1.72, the second superlens material is refractive index n 4 Optical glass=1.85.
Further, fig. 3 is an MTF chart of the present embodiment, in which the abscissa indicates the spatial frequency, and the ordinate indicates the modulus value at the corresponding spatial frequency, and it can be seen from the chart that the MTF value is greater than 0.5 when the spatial frequency is 60, and greater than 0.2 when the spatial frequency is 100, which indicates that the lens has better MTF at high frequency or low frequency, i.e. the lens has better imaging quality at both high frequency and low frequency.
Further, fig. 4 is a plot of the size of the diffuse spots in this example, and the specific values of the size of the diffuse spots are shown in table 3:
TABLE 3 Table 3
As can be seen from fig. 4 and table 3, the RMS size of the root mean square at the central view field is smaller than 1.7um, which is equivalent to the pixel size, and the RMS size of the root mean square at the full view field is smaller than 5um and smaller than 4 pixel sizes, which indicates that the lens has better light converging effect, i.e. the lens imaging quality is excellent.
Further, fig. 5 is a vertical chromatic aberration diagram of the embodiment, wherein curves on the left and right sides are boundaries of the eichwan, and three curves in the middle represent vertical chromatic aberration of light rays with different wavelengths. As can be seen from the figure, the vertical axis chromatic aberration of all wavelengths is smaller than Yu Aili spot size, which shows that the lens has better light converging effect of different wavelengths and better imaging effect on complex light environment.
Example 2
The lens FOV was 50, the focal length F was 12mm, and the total system length was 24.3mm.
The parameters of each surface of the lens are shown in Table 4:
TABLE 4 Table 4
It should be noted that the "thickness" represents the distance from each face to the next, and this value represents the lens thickness between the left and right surfaces of the same lens; this value represents the distance of the lens between the surfaces of the different lenses.
Table 4 describes the microstructured side of the superlens in binary terms, which is equivalent from the principle that: the phase change that occurs after light passes through the entire surface is represented by a polynomial:，
wherein the phase difference is accumulated for the light rays, N is the number of polynomial coefficients in the series, is the coefficient of the power of ρ, ρ is the normalized radial aperture coordinates, and M is the diffraction order. Binary face polynomial parameter A of example 2 i Listed in table 5:
TABLE 5
Specifically, the focal length f of the first refractive lens 101 1 48.85mm, focal length f of second refractive lens 102 2 = -38.11mm, focal length f of first superlens 3 The focal length f of the second superlens = 317.0mm 4 =-141.28mm，|f 1 /f 2 |=1.25，|f 3 /f 4 |=2.75；
Specifically, the radius of curvature of the surface of the first refractive lens near the object side is R 1011 =27.51mm, the radius of curvature of the surface near the image side is R 1012 =110.90mm，R 1012 /R 1011 =4.03；
Specifically, the radius of curvature of the surface of the second refractive lens close to the object side is R 1021 =57.24 mm, the radius of curvature of the surface near the image side is R 1022 =21.50mm，R 1021 /R 1022 =2.66；
Concrete embodimentsIn the first refractive lens having a thickness d 1 =5 mm, after which the air distance is a 1 =8.27 mm, second refractive lens thickness d 2 =4.23 mm, after which the air distance is a 2 =2.2mm，d 1 +a 1 =13.27mm，d 2 +a 2 =6.43mm；
Specifically, the thickness of the first superlens is d 3 =1 mm, after which the air distance is a 3 =1.56 mm, second superlens thickness d 4 =1 mm, after which the air distance is a 4 =1.03mm，a 3 +d 3 =2.56mm，d 4 +a 4 =2.03mm；
Specifically, the focal length of the system is f=12 mm, and the total length of the system is l=24.3 mm;
specifically, the refractive lens surface is spherical, wherein the first refractive lens has refractive index n 1 Optical glass=1.73, the second refractive lens is refractive index n 2 Optical glass=1.96, the first superlens is refractive index n 3 Optical glass=1.69, the second superlens is refractive index n 4 Optical glass=1.70.
Further, fig. 7 is an MTF chart of the present embodiment, in which the abscissa indicates the spatial frequency, and the ordinate indicates the modulus value at the corresponding spatial frequency, and it can be seen from the chart that the MTF value is greater than 0.6 when the spatial frequency is 60, and greater than 0.3 when the spatial frequency is 100, which indicates that the lens has better MTF at both high frequency and low frequency, i.e., the lens has better imaging quality at both high frequency and low frequency.
Further, fig. 8 is a plot of the size of the diffuse spots in this example, and the specific values of the size of the diffuse spots are shown in table 6:
TABLE 6
As can be seen from fig. 8 and table 6, the RMS size of the root mean square at the central field of view is smaller than 1.6um, which is equivalent to the pixel size, and the RMS size of the root mean square at the full field of view is smaller than 4um and smaller than 4 pixel sizes, which indicates that the lens has better light converging effect, i.e. the lens imaging quality is excellent.
Further, fig. 9 is a vertical chromatic aberration diagram of the embodiment, wherein curves on the left and right sides are boundaries of the eichwan, and three curves in the middle represent vertical chromatic aberration of light rays with different wavelengths. As can be seen from the figure, the vertical axis chromatic aberration of all wavelengths is smaller than Yu Aili spot size, which shows that the lens has better light converging effect of different wavelengths and better imaging effect on complex light environment.
The total length of the long-focus lens is generally more than 50mm, about 5 lenses are used, and two embodiments prove that the lens can reduce the lenses into four lenses on the premise that the focal length meets the long-focus requirement of a mobile phone, the total length of an optical system is controlled to be 30mm, and the overall performance meets the display effect requirement of the external long-focus lens of the mobile phone.
In summary, the folded and super-mixed mobile phone external tele lens provides excellent display effect, simultaneously greatly reduces the total length and weight of the system, ensures that the whole structure is more stable, realizes better stability and lower cost, and ensures that the mobile phone external lens is more convenient and meets market demands.
In addition, in the invention, the lens material, thickness, focal length, distance between lenses and the like can be adjusted in the range, and a practical foundation is provided for external lenses with various index requirements.
It should be noted that in the description of the present specification, the descriptions of the terms "one embodiment," "example," "specific example," and the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Those of ordinary skill in the art will recognize that the embodiments described herein are for the purpose of aiding the reader in understanding the principles of the present invention and should be understood that the scope of the invention is not limited to such specific statements and embodiments. Those of ordinary skill in the art can make various other specific modifications and combinations from the teachings of the present disclosure without departing from the spirit thereof, and such modifications and combinations remain within the scope of the present disclosure.
Claims (7)
1. The refraction and super-mixing type external tele lens of the mobile phone is characterized by comprising two conventional refraction lenses and two super-lenses, wherein a first refraction lens, a second refraction lens, a first super-lens and a second super-lens are sequentially arranged from an object plane to an image plane along the optical axis direction; the first refractive lens has positive focal power, the surface of the first refractive lens close to the object plane is a convex surface, and the surface of the first refractive lens close to the image plane is a concave surface; the second refractive lens has negative focal power, the surface of the second refractive lens close to the object plane is a convex surface, and the surface of the second refractive lens close to the image plane is a concave surface; the first superlens has positive focal power, the surface of the first superlens, which is close to the object plane, is a structural plane, and the surface of the first superlens, which is close to the image plane, is a plane; the second superlens has negative focal power, the surface of the second superlens close to the object plane is a structural plane, and the surface of the second superlens close to the image plane is a plane; and the focal length of the first refractive lens is f 1 The focal length of the second refractive lens is f 2 Both satisfy |f 2 |＜f 1 ＜|2f 2 I (I); the focal length of the first superlens is f 3 The focal length of the second superlens is f 4 Both satisfy |2f 4 |＜f 3 ＜|3f 4 |。
2. The external tele lens of claim 1, wherein the surface of the first refractive lens adjacent to the object side has a radius of curvature R 1011 The curvature radius of the surface near the image side is R 1012 The two satisfy the relation: r is more than 4.0 and less than 1012 /R 1011 ＜8.2。
3. The external tele lens of claim 1, wherein the surface of the second refractive lens adjacent to the object side has a radius of curvature R 1021 The curvature radius of the surface near the image side is R 1022 The two satisfy the relation: r is more than 2.3 1021 /R 1022 ＜2.8。
4. The external tele lens of claim 1, wherein the first refractive lens has a thickness d 1 After which the air distance is a 1 The second refractive lens has a thickness d 2 After which the air distance is a 2 These parameters satisfy the relationship: (d) 1 +a 1 ）＞（d 2 +a 2 ）。
5. The external tele lens of claim 1, wherein the first superlens has a thickness d 3 After which the air distance is a 3 The thickness of the second superlens is d 4 After which the air distance is a 4 These parameters satisfy the relationship: (a) 3 +d 3 ）＞（d 4 +a 4 ）。
6. The external tele lens of claim 1, wherein the system focal length F and the system total length L satisfy the relationship: l is more than 1.5F and less than 2.5F.
7. The external tele lens of claim 1, wherein the first refractive index is n 1 The refractive index of the second refractive lens is n 2 The refractive index of the first super lens is n 3 The refractive index of the second superlens is n 4 These parameters satisfy: n is more than 1.50 1 ＜1.75；1.50＜n 3 ＜1.75；1.70＜n 2 ＜2.0；1.70＜n 4 ＜2.0。
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| KR20230060436A (en) * | 2021-10-27 | 2023-05-04 | 삼성전자주식회사 | Lens assembly, imaging apparatus and electronic apparatus employing the same |
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