CN111025528A - Imaging system, camera module and mobile terminal - Google Patents
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0055—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
- G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
- G02B13/0045—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having five or more lenses
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B3/00—Simple or compound lenses
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- G—PHYSICS
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/50—Constructional details
- H04N23/55—Optical parts specially adapted for electronic image sensors; Mounting thereof
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
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Abstract
The embodiment of the application provides an imaging system, module and mobile terminal make a video recording, relates to the technical field of shooing, and imaging system includes: the optical lens group comprises a plurality of lenses which are sequentially arranged along a light incidence direction, the image sensor is arranged on an imaging side of the optical lens group and is used for converting an optical image transmitted to the image sensor into an electric signal, the main light angle adjusting lens is arranged on a light path between the optical lens group and the image sensor, the main light angle adjusting lens is provided with a first transmission surface and a second transmission surface, the first transmission surface is an aspheric surface, a micro lens array is integrated on the second transmission surface and is opposite to a pixel unit array of the image sensor, the aspheric surface is used for converging the main light transmitted by the optical lens group towards the direction of an optical axis close to the imaging system, and the micro lens array is used for converging the main light transmitted by the aspheric surface towards the direction of the optical axis.
Description
Technical Field
The application relates to the technical field of photographing, in particular to an imaging system, a camera module and a mobile terminal.
Background
The rise and development of smart phones in recent years has placed new demands and challenges on imaging technology. In order to improve the performance of the imaging system, an antireflection film is further coated on the optical lens to eliminate stray light of the whole imaging system.
In specific imaging, in an application scenario with a high requirement on wavelength resolution, for example, in multispectral or hyperspectral imaging applications, since the receiving Angle of a multispectral or hyperspectral detector is required to be less than 15 °, the maximum value of a main light Angle (CRA) of an imaging system needs to be close to 15 °, that is, the CRA of the imaging system needs to be reduced to adapt to a detector with a small receiving Angle, and finally, the imaging quality is improved.
It should be explained that: the CRA of the imaging system refers to the angle between the optical axis and the light rays focused on the image sensor from the imaging lens to the image sensor, and referring to fig. 1, CRA1 and CRA2 are the angles between the optical axis and the two light rays focused on the image sensor. As shown in FIG. 1, the receiving angle of the image sensor
The angle between the optical axis and the incident light ray of the pixel unit on the image sensor is the best. Generally, when receiving angle
When matched with the CRA, the imaging effect is optimal. By matching is meant the CRA to the reception angle
The absolute value of the difference is less than or equal to 3Angle of reception
The imaging effect is best matched with the CRA.
Disclosure of Invention
The embodiment of the application provides an imaging system, a camera module and a mobile terminal, and mainly aims to provide an imaging system capable of reducing CRA.
In order to achieve the above purpose, the embodiment of the present application adopts the following technical solutions:
in a first aspect, the present application provides an imaging system comprising:
an optical lens group including a plurality of lenses sequentially arranged in a light incident direction;
the image sensor is positioned on the imaging side of the optical lens group and used for converting the optical image transmitted to the image sensor into an electric signal;
the main light angle adjusting lens is arranged on a light path between the optical lens group and the image sensor and is provided with a first transmission surface and a second transmission surface, the first transmission surface is an aspheric surface, a micro lens array is integrated on the second transmission surface, the micro lens array is arranged opposite to a pixel unit array of the image sensor, the aspheric surface is used for converging the main light transmitted by the optical lens group towards the direction of an optical axis close to the imaging system, and the micro lens array is used for converging the main light transmitted by the aspheric surface towards the direction of the optical axis.
The imaging system that this application embodiment provided, owing to set up chief ray angle adjusting lens between optical lens group and image sensor, and chief ray angle adjusting lens is including being used for with chief ray towards aspheric surface and the microlens array that is close to imaging system's optical axis direction convergence, when the light that follows optical lens group transmission passes through the aspheric surface, the aspheric surface can make the chief ray converge towards the optical axis direction, in order to reduce chief ray angle, when the light that follows aspheric surface transmission passes through the microlens array again, the microlens array is again to chief ray towards the optical axis direction convergence, further reduce chief ray angle, in order to make the chief ray angle that transmits to image sensor and image sensor's acceptance angle phase-match, final guarantee imaging quality. In specific implementation, the curvature radius of the aspheric surface and/or the curvature radius of the micro lens can be changed, namely the surface type of the aspheric surface and/or the surface type of the micro lens are changed, the size of a main light angle transmitted to the image sensor is adjusted, compared with the existing mode of reducing the main light angle transmitted by the optical lens group by increasing the number of lenses, the method can be realized by only changing the surface type of the aspheric surface and the surface type of the micro lens which are matched with each other, so that the Total Track Length (TTL) size of the whole imaging system can be effectively reduced on the premise of ensuring the imaging quality of the imaging system, so that the imaging system meets the miniaturization design requirement, and the application scene of the imaging system is further enlarged.
In a possible implementation manner of the first aspect, the microlens array and the pixel unit array are both M × N arrays, and the microlenses in the microlens array and the pixel units in the pixel unit array are one-to-one, where each microlens is proximate to a corresponding pixel unit, and M and N are integers greater than 1. Through pressing close to the pixel unit with microlens, can make this microlens transmission light all refract to corresponding pixel unit on like this, avoid partial light refraction to adjacent pixel unit on to crosstalk between the pixel unit appears, and then influence the phenomenon of image quality.
In a possible implementation manner of the first aspect, the central axis of the microlens is coaxial with the central axis of the pixel unit. The central axis of the micro lens and the central axis of the pixel unit are in the same straight line, so that the light refracted by the micro lens is ensured to be close to the center of the pixel unit, the light energy receiving efficiency of the image sensor is further improved, and the imaging quality is improved.
In a possible implementation manner of the first aspect, the optical lens further includes an infrared filter, and the infrared filter is disposed on an optical path between the optical lens group and the main light angle adjusting lens. If the imaging wave band of the imaging system does not include the infrared wave band, an infrared filter is arranged on a light path between the optical lens group and the main light angle adjusting lens so as to filter the infrared wave band transmitted by the optical lens group, the main light angle is reduced through the main light angle adjusting lens, the infrared filter is arranged on the light path between the optical lens group and the main light angle adjusting lens, and the reduction effect of the main light angle adjusting lens on the main light ray is not influenced on the basis of ensuring filtering.
In a possible implementation manner of the first aspect, the main light angle adjusting lens is an integrally molded piece. In specific implementation, the method can be implemented by adopting process means such as injection molding, die pressing and the like.
In a possible implementation manner of the first aspect, the optical lens group includes a first lens element, a second lens element, a third lens element and a fourth lens element, an object-side surface of the first lens element is a convex surface, an image-side surface of the first lens element is a concave surface, an object-side surface of the second lens element is a concave surface, an image-side surface of the second lens element is a concave surface, an object-side surface of the third lens element is a concave surface, an image-side surface of the third lens element is a convex surface, an object-side surface of the fourth lens element is a concave surface, and an image-side surface of the fourth lens. Through setting up first lens, second lens, third lens and fourth lens and the main light angle adjusting lens that all have positive focal power, can ensure that imaging quality satisfies the formation of image requirement of mobile terminal such as current cell-phone, panel computer, and this imaging system not only can use the back that has great installation space at the cell-phone, also can use the front that has less installation space at the cell-phone to make the imaging quality that the front-lit made a video recording of cell-phone and the imaging quality that the back-lit made a video recording are equivalent.
In a possible implementation manner of the first aspect, the material of the main light angle adjusting lens is glass, plastic, fiber, or the like.
In a possible implementation form of the first aspect, the main light angle adjusting lens is integrated on the image sensor. That is, the main light angle adjusting lens and the image sensor are packaged as one module, so that the assembling efficiency can be improved when the imaging system is installed.
In a possible implementation manner of the first aspect, the microlens array is one of a spherical microlens array, an aspherical microlens array, a cylindrical microlens array, or a fresnel microlens array. In specific implementation, the microlens array can be selected according to application scenes.
In a second aspect, the present application further provides a camera module, including:
an imaging system according to the first aspect or any implementation form of the first aspect;
and the digital image processor is used for processing the electric signals transmitted by the image sensor to form an image.
The imaging system that this application embodiment provided, owing to provide including above-mentioned embodiment, imaging system is including the chief light angle adjusting lens who is located the light path between optical lens group and the image sensor, and chief light angle adjusting lens includes aspheric surface and microlens array, and after the chief ray that optical lens group transmitted passes through aspheric surface and microlens array in proper order, the chief light angle that transmits to the image sensor can reduce to adaptation image sensor's receiving angle, and then guarantee imaging quality.
In a third aspect, the present application further provides a mobile terminal, including:
a housing having a viewing window;
the camera module is arranged in the shell and is the camera module in the embodiment of the second aspect;
and the display screen is arranged at the visual window and used for displaying the image formed by the digital image processor.
According to the mobile terminal provided by the embodiment of the application, as the mobile terminal adopts the camera module in the implementation mode of the second aspect, the same technical problem can be solved and the same expected effect can be achieved by the mobile terminal provided by the embodiment of the application and the camera module in the technical scheme.
In a possible implementation manner of the third aspect, the mobile terminal is a mobile phone, the imaging system is disposed on a front surface of the mobile phone, the optical lens group includes a first lens, a second lens, a third lens and a fourth lens, an object-side surface of the first lens is a convex surface, an image-side surface of the first lens is a concave surface, an object-side surface of the second lens is a concave surface, an image-side surface of the second lens is a concave surface, an object-side surface of the third lens is a concave surface, an image-side surface of the third lens is a convex surface, an object-side surface of the fourth lens is a concave surface, and an image-side surface of the fourth lens is a. Because the front side of the mobile phone has a smaller installation space, the imaging system is arranged on the front side of the mobile phone, so that the space on the front side of the mobile phone can be fully utilized, and the imaging quality of the front camera can be improved.
In a possible implementation manner of the third aspect, the mobile terminal is a tablet computer.
Drawings
FIG. 1 is a schematic illustration of a chief ray angle transmitted to an image sensor and a receiving angle of the image sensor in an imaging system;
FIG. 2A is a schematic diagram of an imaging system;
FIG. 2B is the MTF graph of FIG. 2A;
FIG. 2C is the CRA graph of FIG. 2A;
FIG. 3A is a schematic structural view of another imaging system;
FIG. 3B is the MTF graph of FIG. 3A;
FIG. 3C is the CRA graph of FIG. 3A;
fig. 4 is a schematic structural diagram of an imaging system provided in an embodiment of the present application;
FIG. 5 is an enlarged view of FIG. 4 at A;
FIG. 6A is a graph of MTF using the design parameters of tables 2-1 and 2-2;
FIG. 6B is a CRA graph using the design parameters of tables 2-1 and 2-2;
FIG. 7 is a schematic view of the imaging of FIG. 4;
fig. 8 is a schematic diagram illustrating a positional relationship between a main light angle adjusting lens and an image sensor in an imaging system according to an embodiment of the present application;
fig. 9 is a schematic structural diagram of an imaging system provided in an embodiment of the present application;
FIG. 10A is a graph of MTF using the design parameters of tables 1-1 and 1-2;
FIG. 10B is a CRA graph using the design parameters of tables 1-1 and 1-2;
FIG. 11A is a graph of MTF using the design parameters of tables 3-1 and 3-2;
FIG. 11B is a CRA graph using the design parameters of tables 3-1 and 3-2.
Detailed Description
The embodiments of the present application relate to an imaging system, a camera module, and a mobile terminal, and the imaging system, the camera module, and the mobile terminal are described in detail below with reference to the accompanying drawings.
The following is a brief description of the concepts involved in the present application:
field of View (FOV);
f-number (Fno);
total Track Length (TTL);
modulation Transfer Function (MTF);
principal light Angle (CRA).
The embodiment of the application provides a mobile terminal with function of making a video recording, this mobile terminal includes the casing, makes a video recording module and display screen, and the casing is formed with visual window, and the module setting of making a video recording is in the casing, and the display screen setting is in visual window department, and the module of making a video recording is used for forming the image by the scene of will making a video recording, and the display screen is used for the image display who will form above that. By way of example, the mobile terminal may be a mobile phone, a tablet computer, or other electronic device.
In order to improve the imaging quality of the camera module in the mobile terminal, the embodiment of the application further provides a camera module, wherein the camera module comprises an imaging system and a digital image processor, the imaging system is used for imaging, and the digital image processor is used for processing the electric signal transmitted by the imaging system to form an image.
To reduce CRA, referring to fig. 4 and 5, the imaging system includes: an optical lens group 1, a main light angle adjusting lens2 and an image sensor 3, wherein the optical lens group 1 includes a plurality of lenses 101 sequentially arranged along a light incidence direction, an image sensor 3 is disposed on an imaging side of the optical lens group 1, the image sensor 3 is used for converting an optical image transmitted thereto into an electrical signal, a main light angle adjusting lens2 is disposed on an optical path between the optical lens group 1 and the image sensor 3, and in conjunction with fig. 4 and 5 and fig. 7, the main light angle adjusting lens2 is formed with a first transmission surface and a second transmission surface, the first transmission surface is an aspheric surface 201, a microlens array 202 is integrated on the second transmission surface, the microlens array 202 is disposed opposite to a pixel cell array 301 of the image sensor 3, the aspheric surface 201 is used for converging the chief ray transmitted by the optical lens group 1 towards the direction close to the optical axis of the imaging system, and the micro lens array 202 is used for converging the chief ray transmitted by the aspheric surface 201 towards the direction close to the optical axis.
By arranging the chief ray angle adjusting lens2 on the light path between the optical lens group 1 and the image sensor 3, the aspheric surface 201 and the micro lens array 202 can enable chief rays to converge towards the optical axis direction, namely, when the light rays transmitted from the optical lens group 1 pass through the aspheric surface 201, the aspheric surface 201 can enable the chief rays to converge towards the optical axis direction so as to reduce the CRA, when the light rays transmitted from the aspheric surface 201 pass through the micro lens array 202 again, the micro lens array 202 converges towards the optical axis direction again for the chief rays, the CRA is further reduced, and finally the size of the CRA is reduced, so that the imaging system can adapt to the imaging requirements of multispectral or hyperspectral.
In the specific implementation, if the image sensor 3 with higher wavelength resolution is selected, and the receiving angle of the image sensor 3 is
In order to match the image sensor 3 and ensure imaging quality, the absolute value of the difference between the CRA transmitted to the pixel cell of the pixel cell array 301 of the image sensor 3 and the reception angle of the pixel cell is less than or equal to 3 °. For example, if the receiving angle of a certain pixel unit is 12 °, the CRA transmitted to the pixel unit has a value range of: CRA is more than or equal to 9 degrees and less than or equal to 15 degrees. The embodiment of the application reduces the main light angle by arranging the main light angle adjusting lens2 on the light path between the optical lens group 1 and the image sensor 3, so that the CRA transmitted to the pixel unit of the image sensor 3 is matched with the receiving angle of the image sensor 3. In order to improve the effect of the optical image transmitted to the image sensor, the CRA transmitted to the pixel cell of the image sensor 3 is smaller than the acceptance angle of the pixel cell.
In some embodiments, the aspheric surface 201 is a convex surface, and the image-side surface of the microlenses of the microlens array 202 is also a convex surface. In particular implementations, the radius of curvature of the aspheric surface and/or the radius of curvature of the microlenses may be adjusted to change the profile of the aspheric surface and/or the profile of the microlenses, ultimately adjusting the size of the CRA transmitted to the image sensor 3.
It should be noted that: adjusting the radius of curvature of the aspheric surface and/or the radius of curvature of the microlens means: only the radius of curvature of the aspheric surface may be adjusted to adjust the magnitude of the principal light angle transmitted to the image sensor 3; it is also possible to adjust only the radius of curvature of the microlens to adjust the magnitude of the chief ray angle transmitted to the image sensor 3; it is also possible to adjust the radius of curvature of the aspherical surface and the radius of curvature of the microlens at the same time to adjust the magnitude of the chief ray angle transmitted to the image sensor 3.
The size of the CRA transmitted to the image sensor 3 can be adjusted in various ways, one is by increasing the number of lenses, and another is by using the main light angle adjusting lens provided in the embodiment of the present application, for example, referring to fig. 2A, the optical lens group of the imaging system is composed of four lenses, and the optical performance parameters of the imaging system are as follows: the FOV is 84 °, Fno is 2.4, TTL is 3.995mm (H1 in fig. 2A), the MTF curve of the imaging system is shown in fig. 2B, the CRA curve is shown in fig. 2C, and as shown in fig. 2C, the maximum value of the CRA of the imaging system is 35 °, that is, the angle satisfies the receiving angle of the conventional RGB image sensor, but for some application scenarios requiring high wavelength resolution, such as multispectral or hyperspectral imaging applications, since the receiving angle of the multispectral or hyperspectral image sensor requires less than 15 °, if the imaging system is applied in the multispectral or hyperspectral imaging application scenarios, severe wavelength crosstalk is caused, so that the application fails. In order to reduce the main light angle and meet the requirement of the receiving angle of the multispectral or hyperspectral detector, the imaging system is designed as the structure shown in fig. 3A, the imaging lens group 001 of the imaging system comprises six lenses, and the optical performance parameters of the imaging system are as follows: the FOV is 82 °, the Fno is 2.4, and the TTL is 5.50mm (H2 in fig. 3A), the MTF curve of the imaging system is shown in fig. 3B, the CRA curve is shown in fig. 3C, and as can be seen from fig. 3C, the maximum CRA value of the imaging system is 13 °, which satisfies the requirement of the acceptance angle of the multispectral or hyperspectral image sensor. But since the number of optical lenses of the imaging system is increased to six compared to four lenses, the total lens height TTL (H2 in fig. 3A) is increased to 5.50mm compared to H1 in fig. 2A.
When the imaging system provided by the embodiment of the present application is adopted, that is, the main light angle adjusting lens2 is added under the condition that the four lenses as shown in fig. 2A are not changed, and finally, the optical performance parameters of the imaging system are as follows: FOV 84 °, Fno 2.4, TTL 4.083mm (H3 in fig. 4), the MTF curve of the imaging system is shown in fig. 6A, the CRA curve is shown in fig. 6B, and the curve distribution of the CRA shown in fig. 6B is compared with the curve distribution of the CRA shown in fig. 3C, the curve distribution of the CRA obtained by the imaging system provided by the embodiment of the present application is consistent with the curve distribution of the CRA shown in fig. 3C, and the MTF profile shown in fig. 6A is compared with the MTF profile shown in fig. 3B, the MTF profile obtained by the imaging system provided by the embodiment of the present application is consistent with the MTF profile shown in fig. 3B, further the imaging quality of the imaging system using the embodiments of the present application remains substantially the same as the imaging quality of the imaging system using figure 3A, however, the total lens height of 4.083mm is significantly reduced compared to the total lens height of 5.50 mm. Therefore, when the main light angle is reduced by using the combined aspheric lens 201 and the microlens array 202 provided by the embodiment of the present application, the TTL value of the whole imaging system can be significantly reduced compared with that by increasing the number of lenses, so that the whole imaging system meets the design requirement of miniaturization. For example, the imaging system shown in fig. 4 can be applied not only to the Back of a mobile phone to form Back Side Illumination (BSI) photography, but also to the front of a mobile phone with a smaller installation space to form Front Side Illumination (FSI) photography, so that there is no need to increase the space for installing the imaging system on the front of the mobile phone, and the photographic effect of the Back Side photography and the front Side photography is equivalent, thereby improving the user experience of the front Side photography.
The realization of different principal light angles by adjusting the surface shape of the aspherical surface and/or adjusting the surface shape of the microlenses is demonstrated below by three examples.
It should be noted that: the following parameters referred to in tables 1-1, 2-1 and 3-1 are:
surface is the Surface; radius is the Radius of curvature; thickness is lens Thickness; material is the lens Material (the front numbers represent the refractive index of the lens Material and the rear numbers represent the abbe number of the lens Material, e.g. the refractive index of lens1 is 1.54 or the abbe number is 56.0); Semi-Diameter is the lens radius; stop is a diaphragm; infinity is the radius of curvature of Infinity; micro lenses are Micro lens arrays; glass is Glass (as a carrier for aspheric surfaces and microlens arrays); the lenses 1 to 4 are four lenses arranged in order along the light incidence direction; lens5 is an aspheric lens; the Sensor is an image Sensor; 1 ═ Micro applied on each cell on sensor represents that one pixel unit of the image sensor corresponds to one microlens.
The following tables 1-2 show aspheric conic coefficients of the object-side surface and the image-side surface of each lens in table 1-1, the following tables 2-2 show aspheric conic coefficients of the object-side surface and the image-side surface of each lens in table 2-1, the following tables 3-2 show aspheric conic coefficients of the object-side surface and the image-side surface of each lens in table 3-1, and the parameters referred to in tables 1-2, 2-2, and 3-2 are:
r1 represents the object side of the lens; r2 represents the image side of the lens; conic represents the aspheric Conic coefficient, and the following is an expression for the aspheric ordinate value:
wherein: z represents the ordinate value of the aspherical surface:
c is a Radius value in Table 1-1, Table 2-1 and Table 3-1;
k is the Conic value in tables 1-2, 2-2 and 3-2:
x is an abscissa value;
A1is a first order aspheric coefficient, A2Is a second order aspheric coefficient, A10Is a tenth order aspheric coefficient;
A3to A10To the corresponding values of 3 to 10 in tables 1 to 2, tables 2 to 2 and tables 2 to 3, A1And A2Generally, 0 is taken out of tables 1-2, tables 2-2 and tables 3-2Now;
TABLE 1-1
Tables 1 to 2
When the parameters shown in tables 1-1 and 1-2 are adopted for the first Lens (Lens1), the second Lens (Lens2), the third Lens (Lens2), the fourth Lens (Lens4) and the main light angle adjusting Lens (Lens5, Glass and Micro Lens, where Glass is a carrier of Lens5 and Micro Lens) of the imaging system provided in the embodiment of the application, the optical performance parameters of the imaging system are as follows: FOV 84 °, Fno 2.4, TTL 4.08, and CRA maximum 23 °.
TABLE 2-1
Tables 2 to 2
When the parameters shown in tables 2-1 and 2-2 are adopted for the first Lens (Lens1), the second Lens (Lens2), the third Lens (Lens3), the fourth Lens (Lens4) and the main light angle adjusting Lens (Lens5, Glass and Micro Lens, where Glass is a carrier of Lens5 and Micro Lens) of the imaging system provided in the embodiment of the application, the optical performance parameters of the imaging system are as follows: FOV 84 °, Fno 2.4, TTL 4.08, and CRA maximum 13 °.
Comparing the parameters shown in tables 1-1 and 2-1, the radii of curvature of Lens1, Lens2, Lens3 and Lens4 are substantially constant, the Lens thickness is substantially constant, the Lens material is constant, and the Lens radius is substantially constant; the curvature radius of Glass is unchanged, the thickness of the lens is unchanged, the material of the lens is unchanged, and the radius of the lens is basically unchanged; only the radius of curvature of Lens5 was changed (from-9.67 to 27.06), the Lens thickness was substantially unchanged, and the Lens radius was substantially unchanged; and the radius of curvature of the Micro lens (R ═ 0.005 to R ═ 0.008) and the conic constant K ' (K ' ═ -312 to K ' ═ 0) were changed.
FIG. 10A is an MTF curve of the imaging system using the parameters shown in tables 1-1 and 1-2, FIG. 6A is an MTF curve of the imaging system using the parameters shown in tables 2-1 and 2-2, in which curve P1 represents the contrast of an out-of-plane arc at a frequency of 500lp/mm, curve Q1 represents the contrast of a meridional plane at a frequency of 500lp/mm, curve P2 represents the contrast of an out-of-plane arc at a frequency of 100lp/mm, curve Q2 represents the contrast of a meridional plane at a frequency of 100lp/mm, as compared with FIG. 10A and FIG. 6A, the contrast of a meridional plane is substantially constant at a frequency of 500lp/mm and a frequency of 100lp/mm, and the contrast of an out-plane arc is substantially constant at a frequency of 500lp/mm and a frequency of 100lp/mm, thereby illustrating that the imaging system of fig. 10A is imaging of comparable quality to the imaging system of fig. 6A.
Fig. 10B is a CRA curve of the imaging system using the parametric imaging systems shown in tables 1-1 and 1-2, and fig. 6B is a CRA curve of the imaging system using the parametric imaging systems shown in tables 2-1 and 2-2, the CRA is significantly reduced compared to fig. 10B and 6B, and the maximum value of the CRA is reduced from 23 ° to 13 °, and the TTL is kept unchanged.
TABLE 3-1
TABLE 3-2
When the first Lens (Lens1), the second Lens (Lens2), the third Lens (Lens3), the fourth Lens (Lens4) and the main light angle adjusting Lens (Lens5, Glass and Micro Lens, where Glass is a carrier of Lens5 and Micro Lens) of the imaging system provided in the embodiment of the present application adopt the parameters shown in tables 3-1 and 3-2, the optical performance parameters of the imaging system are as follows: FOV 84, Fno 2.4, TTL 4.08, and CRA maximum 7 °.
Comparing the parameters shown in tables 2-1 and 3-1, the radii of curvature of Lens1, Lens2, Lens3 and Lens4 are substantially constant, the Lens thickness is substantially constant, the Lens material is constant, and the Lens radius is substantially constant; the curvature radius of Glass is unchanged, the thickness of the lens is unchanged, the material of the lens is unchanged, and the radius of the lens is basically unchanged; only the radius of curvature of Lens5 (from 27.06 to 8.64), the Lens thickness and the Lens radius were changed, and the radius of curvature of Micro Lens (R ═ 0.008 to R ═ 0.003) and the conic constant K' (K ═ 0 to K ═ 3.19) were changed.
FIG. 6A is an MTF curve of the imaging system at the parameters shown in tables 2-1 and 2-2, FIG. 11A is an MTF curve of the imaging system at the parameters shown in tables 3-1 and 3-2, curve P1 represents a contrast of an out-of-plane at a frequency of 500lp/mm, curve Q1 represents a contrast of a meridional plane at a frequency of 500lp/mm, curve P2 represents a contrast of an out-of-plane at a frequency of 100lp/mm, curve Q2 represents a contrast of a meridional plane at a frequency of 100lp/mm, the contrast of a meridional plane is substantially constant at a frequency of 500lp/mm and a frequency of 100lp/mm, the contrast of an out-of-plane is substantially constant at a frequency of 500lp/mm and a frequency of 100lp/mm as compared with FIGS. 11A and 6A, thereby illustrating that the imaging system of fig. 11A is imaging of comparable quality to the imaging system of fig. 6A.
Fig. 6B is a CRA curve of the imaging system using the parametric imaging system shown in tables 2-1 and 2-2, and fig. 11B is a CRA curve of the imaging system using the parametric imaging system shown in tables 3-1 and 3-2, the CRA is significantly reduced and the maximum value of the CRA is reduced from 13 ° to 7 ° and the TTL is kept constant, as compared with fig. 11B and 6B.
Therefore, it is shown by the three embodiments described above: the size of the chief ray angle transmitted to the image sensor can be changed by changing the curvature radius of the aspheric surface and/or changing the curvature radius of the micro lens under the condition that the TTL is not changed basically. The benefits thus achieved are: compared with the whole lens, the imaging system has the advantages that the main light angle is reduced, the TTL is basically not changed, the application scene of the imaging system is obviously enlarged, the existing electronic equipment is developed towards the direction of miniaturization design, and the imaging system not only effectively improves the imaging quality, but also meets the requirement of miniaturization design.
When the imaging system provided by the embodiment of the application adopts the main light angle adjusting lens2 formed by the aspheric lens and the micro lens array, the smaller the main light angle transmitted to the image sensor is, the smaller the wavelength crosstalk between different pixel units of the image sensor is, and thus the performance requirement of the image sensor can be correspondingly reduced; meanwhile, the smaller the wavelength drift and crosstalk after being transmitted to the filter in the image sensor, the convenience is brought to the subsequent correction of the whole imaging system.
In order to improve the imaging quality, in some embodiments, referring to fig. 5, one microlens of the microlens array 202 is disposed opposite to one pixel unit of the pixel unit array 301 of the image sensor 3, the microlens is proximate to the corresponding pixel unit, that is, the microlens array 202 and the pixel unit array 301 are both M × N arrays, and the microlens in the microlens array 202 and the pixel unit in the pixel unit array 301 are one-to-one, wherein each microlens is proximate to the corresponding pixel unit, and M and N are integers greater than 1.
It should be noted that: the microlens being close to the pixel unit means that the surface of the microlens is close to the pixel unit, or the surface of the microlens is close to the pixel unit (i.e., the distance between the surface of the microlens and the pixel unit 301 is less than or equal to 20 μm). Through pressing close to rather than the corresponding pixel unit with the microlens, the light that the microlens transmission is on basically all refracting to corresponding pixel unit like this, compare and have great interval between microlens and the pixel unit, avoid the light that the microlens transmission is on transmitting to adjacent pixel unit, so that the phenomenon of wavelength crosstalk appears between the pixel unit, improve the luminous intensity of transmission to image sensor's pixel unit, be favorable to improving the SNR of image sensor received signal, therefore, press close to rather than corresponding pixel unit with the microlens, can effectively ensure imaging performance.
In order to further improve the imaging quality of the imaging system, in other embodiments, referring to fig. 5, the central axis P1 of the microlens is coaxial with the central axis P2 of the pixel cell. Namely, the central axis P1 of the micro lens is in the same line with the central axis P2 of the pixel unit, so the technical effects achieved are as follows: most of the light refracted from the micro lens is close to the center of the pixel unit, so that more light energy refracted from the micro lens is transmitted to the center of the pixel unit, the light energy receiving efficiency of the image sensor 3 is further improved, and finally the imaging quality of the whole imaging system, such as imaging illumination, imaging color and the like, is improved.
The light angle adjusting lens2 has various implementations, and in some implementations, the aspheric surface 201 is formed by nanoimprinting on one side of the transparent substrate 202, and the microlens array 202 is formed by nanoimprinting on the other side opposite to the aspheric surface 201, that is, the transparent substrate 203 is used as a carrier, and the aspheric surface 201 and the microlens array 202 are carried on the transparent substrate 203. By adopting the structure, on the premise of ensuring that the main light angle can be reduced, the structure is simple, the manufacture is convenient, and the TTL of the whole imaging system can not be increased more. In other embodiments, referring to fig. 8, the aspheric surface 201 and the microlens array 202 are integrally formed by injection molding or die pressing, i.e., without a transparent substrate, for example, a photopolymer layer is deposited, a high temperature reflow process is applied to one side of the photopolymer layer to form the microlens array, a high temperature reflow process is also applied to the other side of the photopolymer layer to form the aspheric surface, or a mask exposure may be used to form the microlens array and the aspheric surface. Of course, the aspheric surface 201 and the microlens array 202 may be implemented in other ways, and any structure is within the protection scope of the present application.
The material of the light angle adjusting lens2 can be transparent plastic, transparent glass or other transparent polymer materials.
The microlens array has various realizable structures, and for example, the microlens array can be one of a spherical microlens array, an aspherical microlens array, a cylindrical microlens array or a fresnel microlens array.
The structure of the image sensor 3 has various cases, and the image sensor 3 includes, but is not limited to, a Charge-coupled Device (CCD), a Complementary Metal Oxide Semiconductor (CMOS), and so on. In specific implementation, parameters such as pixel resolution, pixel size, quantum efficiency, sensitivity or dynamic range of the image sensor can be selected according to requirements.
In some embodiments, when the light wave of the imaging system does not include the infrared band, as shown in fig. 9, an infrared filter 4 is disposed on the light path between the optical lens group 1 and the main light angle adjusting lens2, that is, the light passes through the infrared filter 4 to transmit the near infrared cut visible light; in other embodiments, when the light wave of the imaging system includes an infrared band but not a visible band, a visible light filter is disposed on the light path between the optical lens group 1 and the main light angle adjusting lens2, that is, the visible light filter is passed through to cut off the near infrared light passing through the visible light. The choice of filter is therefore chosen according to the wavelength band to be transmitted by the imaging system.
The main light angle adjusting lens2 can be packaged with the image sensor 3 to form a module, and the main light angle adjusting lens2 and the image sensor 3 can be two independent modules, if the main light angle adjusting lens2 and the image sensor 3 are packaged together by adopting a packaging structure, the main light angle adjusting lens is convenient to mount and adjust when an imaging system is specifically assembled.
In some embodiments, referring to fig. 4, the optical lens assembly includes a first lens element, a second lens element, a third lens element and a fourth lens element sequentially disposed along an incident light beam, wherein an object-side surface of the first lens element is a convex surface, an image-side surface of the first lens element is a concave surface, an object-side surface of the second lens element is a concave surface, an object-side surface of the third lens element is a concave surface, an image-side surface of the third lens element is a convex surface, an object-side surface of the fourth lens element is a concave surface, and an image-side surface of the fourth lens element is a concave surface. Namely, the first lens, the second lens, the third lens, the fourth lens and the main light angle adjusting lens with positive focal power, and the imaging system formed in the way can meet the imaging requirements of the existing mobile phones and tablet computers. Particularly, the imaging system can be arranged on the front side of the mobile phone and combined with the digital image processor to form the front camera module, so that the space on the front side of the mobile phone can be fully utilized, and the imaging performance of the front camera module can be effectively improved.
In the description herein, particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (11)
1. An imaging system, comprising:
an optical lens group including a plurality of lenses sequentially arranged in a light incident direction;
the image sensor is positioned on the imaging side of the optical lens group and used for converting the optical image transmitted to the image sensor into an electric signal;
the primary light angle adjusting lens is arranged on a light path between the optical lens group and the image sensor and is provided with a first transmission surface and a second transmission surface, the first transmission surface is an aspheric surface, a micro lens array is integrated on the second transmission surface, the micro lens array is arranged opposite to a pixel unit array of the image sensor, the aspheric surface is used for enabling primary light transmitted by the optical lens group to be close to the optical axis direction of the imaging system to be converged, and the micro lens array is used for enabling the primary light transmitted by the aspheric surface to be close to the optical axis direction to be converged.
2. The imaging system of claim 1, wherein the microlens array and the pixel cell array are each an M x N array, and wherein the microlenses within the microlens array and the pixel cells within the pixel cell array are one-to-one, wherein each microlens is proximate to a corresponding pixel cell, and wherein M and N are integers greater than 1.
3. The imaging system of claim 2, wherein a central axis of each microlens is coaxial with a central axis of a corresponding pixel cell.
4. The imaging system of any of claims 1-3, further comprising an infrared filter disposed in an optical path between the optical lens group and the chief ray angle adjusting lens.
5. The imaging system of any of claims 1-4, wherein the chief ray angle adjusting lens is an integrally formed piece.
6. The imaging system of any of claims 1-5, wherein the chief ray angle adjusting lens is made of glass, plastic, or fiber.
7. The imaging system of any of claims 1-6, wherein the image sensor is a charge coupled device or a complementary metal oxide semiconductor device.
8. The imaging system of any of claims 1-7, wherein the optical lens group comprises a first lens element, a second lens element, a third lens element, and a fourth lens element, wherein an object-side surface of the first lens element is convex, an image-side surface of the first lens element is concave, an object-side surface of the second lens element is concave, an image-side surface of the second lens element is concave, an object-side surface of the third lens element is concave, an image-side surface of the third lens element is convex, an object-side surface of the fourth lens element is concave, and an image-side surface of the fourth lens element is concave.
9. The utility model provides a module of making a video recording which characterized in that includes:
an imaging system as claimed in any one of claims 1 to 8;
a digital image processor for processing the electrical signals transmitted by the image sensor to form an image.
10. A mobile terminal, comprising:
a housing having a viewing window;
the camera module is arranged in the shell and the camera module is the camera module according to claim 9;
and the display screen is arranged at the visual window and used for displaying the image formed by the digital image processor.
11. The mobile terminal of claim 10, wherein the mobile terminal is a mobile phone and the imaging system is disposed on a front surface of the mobile phone.
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Application publication date: 20200417 |