CN104270555B - A kind of curved surface cmos image sensor camera module - Google Patents
A kind of curved surface cmos image sensor camera module Download PDFInfo
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- CN104270555B CN104270555B CN201410479960.0A CN201410479960A CN104270555B CN 104270555 B CN104270555 B CN 104270555B CN 201410479960 A CN201410479960 A CN 201410479960A CN 104270555 B CN104270555 B CN 104270555B
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Abstract
The invention discloses a kind of curved surface cmos image sensor camera module, by using the double Gauss lens without spherical aberration correction mirror as main lens, it is corresponding with main lens that sensor cover to the opposite face of main lens is designed as concave curvatures, and the end of optical fiber two for being coupled with the color filter is coupled with light sensitive diode and main lens to conduct incident light respectively, make the incident light derived from main lens, each optical fiber can be entered in divergent shape, and light sensitive diode is arrived at after being reduced by the color filter, reflection and the pixel-level fusion of incident light can effectively be eliminated, improve light sensitivity, realize while module size is reduced, improve overall picture quality.
Description
Technical field
The present invention relates to integrated circuit fields, more particularly, to a kind of song for improving light sensitivity and simplifying main lens
Face cmos image sensor camera module.
Background technology
Cmos image sensor camera module under prior art includes two big parts：Cmos image sensor and
Main lens.
Imaging sensor is the device for converting optical signals to electric signal, DTV, face-to-face communication etc. be civilian and business
It has been widely used in industry category.According to the difference of photoelectric conversion mode, imaging sensor can be generally divided into electric charge
Coupled device image sensor (Charge-coupled Device, CCD) and cmos image sensor (CMOS IMAGE
SENSOR, CIS) two classes.
For CCD, on the one hand, scientific research and industrial circle in specialty, the CCD with high s/n ratio turn into first choice；
On the other hand, also quite favored in high-end photography and vedio recording field, the CCD that high image quality can be provided.And for CIS,
IP Camera and mobile phone photograph module are also widely applied.
CCD is compared with CIS, and the former power consumption is higher, integrated difficulty is larger, and the latter is low in energy consumption, easy of integration and resolution ratio compared with
It is high.Although CCD may be better than CIS in terms of picture quality, still, as the continuous improvement of CIS technologies and CMOS manufacture
Technological level is substantially improved, the CCD of a part of CIS picture quality already close to same specification.CIS takes in performance
Substantial progress, and by its low cost, high efficiency, transmission speed soon etc. advantage be widely used in tablet personal computer, intelligence
All kinds of emerging fields such as mobile phone.Along with promotion of the field of consumer electronics such as camera cell phone to CIS, following cmos image passes
The market prospects of sensor will be more wide.One of small size, high-performance CIS important topic for being designed to this area research.
Intuitively performance indications are exactly reproduction ability to image to imaging sensor one, and the pixel battle array of imaging sensor
Row are exactly the critical function module for being directly connected to this index.In the prior art, the pel array in CIS, which uses, source image
Plain sensor (Active Pixel Sensor, APS) is used as its photosensitive unit.One APS (i.e. a pixel cell) includes one
Individual light sensitive diode (Photo Diode, PD) and an activated amplifier (Active Amplifier).Pel array can be divided into
Front illuminated formula (Front Side Illuminated, FSI) pel array and back-illuminated type (Back Side Illuminated,
BSI) pel array.
Referring to Fig. 1, the structural profile that Fig. 1 is a kind of FSI pel arrays of cmos image sensor of prior art shows
It is intended to.As shown in figure 1, from section, pel array is divided into three flat beds of upper, middle and lower substantially, and upper strata is filter layer 6, for putting
Put lenticule (Micro-lens) 5 and the color filter (Color Filter) 4.Each lenticule 5 is a convex lens, for pair
Incident light is focused；The color filter 4 is generally arranged to make up color filter array by Bayer pattern.The lower section of filter layer 6 corresponding one
Optical channel 3, the optical channel 2 and PD1 of photosensitive layer (also known as PD layers) 9 of individual metal level 7.Middle level is metal level 7, and matrix is silica
Material, multi-layer metal wiring 8 (being illustrated as 4 layers) is placed with, and circuit structure is formed with electric connection mode, for transmitting telecommunications
Number, the space between adjacent metal wiring forms optical channel 3, and incident light can pass through PD1 from this optical channel 3.Lower floor is PD
Layer 9, host material is silicon, and for placing PD1, the optical channel 2 of PD layers 9 is connected and is aligned with the optical channel 3 of metal level 7.It is micro-
Mirror 5 is used for assembling light, and incident light (hollow arrow is signified in such as figure) sequentially enters metal level optical channel 3, PD by filter layer 6
Layer optical channel 2 reaches the PD1 of lower floor, and PD1 meets photon and photoelectric effect occurs, then spreads out of electric signal, the face in digital processing flow
The RAW data converts that color interpolation algorithm collects PD are coloured image.In the structure of FSI pel arrays, when incident light leads to
When crossing optical channel, because metal level therein has a plurality of layers metal line, some light will be reflected (filled arrows in such as figure
It is signified) so that light intensity incurs loss, and causes image quality to be affected.
Referring to Fig. 2, the structural profile that Fig. 2 is a kind of BSI pel arrays of cmos image sensor of prior art shows
It is intended to.As shown in Fig. 2 unlike FSI pel arrays, in the structure of BSI pel arrays, filter is followed successively by from top to bottom
16 3 layer 14, PD layers 15, metal level flat beds, metal level 16 are located at the lower section of PD layers 15.Filter layer 14 is used for placing lenticule
13 and the color filter 12, each lenticule 13 be a convex lens, below correspond to a PD layer 15 optical channel 11 and PD10.
Incident light (hollow arrow is signified in such as figure) will only need to directly reach PD10 by the optical channel 11 of PD layers 15, without passing through gold
Belong to layer 16, shorten optical channel.Therefore, the reflection of incident light and metal level 16 will not occur in the structure of BSI pel arrays
Effect.Simultaneously as optical channel need not because of metal level 16 metal line 17 and manoeuvring space, make between adjacent pixel away from
From can suitably shorten.The problem of BSI picture element array structures, is, compared to FSI pel arrays, although can be led to by the light of shortening
Road improves the light sensitivity of its pel array, but after the distance between adjacent pixel excessively shortens, the crosstalk between pixel
(crosstalk) (filled arrows are signified in such as figure) is will be apparent, causes the discolouration phenomena of coloured image.
When CIS is applied to field of photography, when camera module is designed, except that need to consider imaging sensor in itself
Outside performance, it is also contemplated that the performance of the shooting main lens of its matching.Except in the application scenario of some lens changeables, such as number
The fields such as single anti-, high-definition digital film, the design objective of more occasions is imaging sensor of the requirement using a fixed dimension
Matched with the main lens of a fixed specification, so as to obtain optimal overall performance.
Referring to Fig. 3, Fig. 3 is the comparison schematic diagram of opthalmic optics' structure and camera optical texture.As shown in figure 3, figure
Middle top half illustrates the optical texture and image-forming principle of human eye：The eyeball 19 that the reflection light on the surface of object 21 passes through people
Crystalline lens 20 reflects, and converges to the image forming surface of retina 18 of the distal end of eyeball 19.The latter half illustrates camera in figure
Optical texture and image-forming principle：The reflection light on the surface of object 21 is reflected by the main lens 23 of optical texture, is converged to
CIS22 surfaces, form digital picture.Compare the two imaging systems, it can be found that three differences：First, the view of human eye
Film 18 is spherical concave curved surface, and CIS22 is rectangle plane (refer to Fig. 1, Fig. 2)；Secondly, 20 1 mirrors of human eye Phakic
Piece, and the lens group that the main lens 23 of camera are made up of some eyeglasses (being illustrated as 6)；Again, it is if human eye is crystalline
The primary mirror of camera system is contrasted as the flange focal distance fa for being human eye, this flange focal distance fa in the rear end of body 20 to the distance of retina 18
First 23 flange focal distance fb want it is short a lot.
Referring to Fig. 4, Fig. 4 is a kind of structural profile signal of cmos image sensor camera module of the prior art
Figure.As shown in figure 4, camera module is by a main lens 31 and a cmos image sensor 24 (by taking FSI pel arrays as an example)
Composition.Main lens 31 design for typical double gauss, (contain spherical aberration correction mirror in lens group for the lens group with 6 eyeglasses
Piece).Cmos image sensor 24 designs for FSI, and its structure type is identical with the structure of the FSI pel arrays in Fig. 1, same tool
There are filter layer 32, metal level 33 and a photosensitive layer 34, metal level 33 is placed with multi-layer metal wiring 28, therefore not reinflated repetition herein
Explanation.The filter layer 32 of cmos image sensor 24 is oppositely arranged and coupled with 1 convex lens of the bottom of main lens 31.Primary mirror
First 31 flange focal distance fc be the distance of 24 upper surface of pel array filter layer 32 from lens group bottom to sensor (i.e. etc.
It is same as the flange focal distance fb of main lens 23 signified in Fig. 3).From (the hollow arrow in such as figure of incident ray derived from main lens 31
It is signified), optical axis (vertical center line of main lens is signified in such as figure) is completely parallel at optical center, at lens edge then
It is gradually at a certain angle towards optical axis direction shape.Because incident ray passes through the He of lenticule 30 of cmos image sensor 24
After the color filter 29, to pass through long and narrow metal level optical channel 27, photosensitive layer optical channel 26 could cause the PD25 of photosensitive layer to feel
Light so that the probability reflected with incident light that optical axis has certain angle is larger, thus one can be lost at image border
Fixed light intensity.The whole height H of this camera lens module is topmost to the distance of the lower surface of pel array photosensitive layer 34 from lens group.
It can be seen that lens group occupies most height space in whole camera lens module, it appears very huge.
As shown in figure 4, when cmos image sensor 24 is coupled with the lens group of main lens 31, just occur one
Individual problem, that is, the image quality of picture centre will be far better than the part of image border.Its major reason is precisely due to FSI
More long and narrow optical channel 27,26 in pel array so that it is photosensitive that the more inclined light of incidence angle can not arrive at PD25 progress.
Compared with FSI pel arrays, BSI pel arrays are in the outside (lower section) of photosensitive layer, therefore the light for passing through shortening because of metal level
Passage can improve the lightsensitivity of its pel array.However, BSI still can not thoroughly solve to respond during Ray obliquity incidence it is poor
Problem.
In view of the above-mentioned problems, the solution under prior art substantially has two kinds：A kind of light for being to try to optimize lens group
Learn design so that light is as far as possible incident image sensor in a perpendicular direction from center to edge derived from camera lens；The
Two kinds are to use digital means, and the light attenuation of image border is compensated in image processing stage.Both schemes, the former
The portability of system is sacrificed significantly, and the latter can only also compensate, it is impossible to really while increase calculates cost to brightness
Play a part of improving picture quality.
The content of the invention
It is an object of the invention to overcome existing for prior art, camera module portability is poor, image border image quality is poor
Drawbacks described above, there is provided a kind of curved surface cmos image sensor camera module, by using the double gauss without spherical aberration correction mirror
It is relative with main lens to be designed as concave curvatures as main lens by camera lens for the opposite face of cmos image sensor towards main lens
Should, and by being coupled with the fiber optic conduction incident light of the color filter, simplified main lens, shorten flange focal distance, can had
Effect reduces the reflection of incident light, improves light sensitivity, realizes while module size is reduced, improve overall picture quality.
To achieve the above object, technical scheme is as follows：
A kind of curved surface cmos image sensor camera module, including：
Main lens, the main lens are the double Gauss lens without spherical aberration correction mirror；
Cmos image sensor, located at the lower section of the main lens, the pel array of the sensor includes the color filter
Array, metal level and photosensitive layer, the sensor cover to the opposite face of the main lens be concave curvatures, the concave curvatures with
It is symmetrical centered on the optical axis of the main lens, and with the lower end convex surfaces of main lens opposite face each other；From the spill
Curved surface is provided inwardly with being respectively communicated with the optical channel of each light sensitive diode of the photosensitive layer, is provided with optical fiber in the optical channel, respectively
The optical fiber lower end is coupled to the light sensitive diode, and upper end couples with the corresponding color filter of the color filter array, and
Uniformly it is coupled to the opposite face of the main lens；
Wherein, the incident light derived from the main lens, each optical fiber can be entered in divergent shape, and passes through the color
After filter reduction, the light sensitive diode is arrived at along the optical fiber.
Preferably, the main lens include the first convex lens, concavees lens, the second convex lens successively from top to bottom, and described the
One convex lens, the second convex lens are single convex lens, and its convex surface is set towards the lateral direction of the main lens, and the concavees lens are
Biconcave lens, the convex surface of second convex lens and the concave curvatures of the sensor opposite face each other；It is each described
The upper end of optical fiber is coupled with described the color filter, and the opposite face of the main lens is uniformly coupled to plumbness.
Preferably, the upper end of each optical fiber is uniformly coupled to the main lens by described the color filter with plumbness
Opposite face.
Preferably, the inner couplings at the upper end proximal end face of each optical fiber have described the color filter, and with plumbness
Uniformly it is coupled to the opposite face of the main lens.
Preferably, the inner couplings of the upper end end of each optical fiber have described the color filter, and are filtered with the color
Mirror is uniformly coupled to the opposite face of the main lens with plumbness together.
Preferably, the concave curvatures of the sensor have the curvature different from the opposite face of the main lens.
Preferably, the concave curvatures of the sensor have spacing, the spacing with the opposite face of the main lens
Equal to the flange focal distance of the main lens.
Preferably, the concave curvatures of the sensor have the opposite face identical curvature with the main lens.
Preferably, the concave curvatures of the sensor and the opposite face of the main lens fit, the main lens
Flange focal distance be zero.
Preferably, opposite face from the sensor cover to the main lens for the metal level or the photosensitive layer spill
Curved surface.
From above-mentioned technical proposal it can be seen that the present invention has advantages below：
1st, 3 are reduced to, makes primary mirror as main lens, eyeglass number by using the double Gauss lens without spherical aberration correction mirror
The design of head is simplified, and has greatly reduced the size of main lens；
2nd, the filter layer of the cmos image sensor of prior art is eliminated, by cmos image sensor towards main lens
It is corresponding with the lower end convex surface of main lens that opposite face is designed as concave curvatures, as the plane of incidence of incident light, and by optical fiber and face
Color filter couples, and is in turn coupled to the lower end convex surface of main lens, instead of lenticule using main lens, highly shortened flange
Focal length；
3rd, incident light is conducted using the optical fiber rather than optical channel that are coupled with the color filter, by each fiber end face and primary mirror
The lower end convex surface of head couples in a vertical direction, and is uniformly distributed on its surface, will can be led with approximately parallel angle from main lens
The incident ray of the divergent shape gone out is almost nondestructively transferred to light sensitive diode array by optical fiber, effectively reduces incident light and exists
The reflex occurred during the incidence of main lens edge, enable with the light sensitive diode array of fiber coupling receive it is uniform,
The incident light of high light intensity, so as to while flange focal distance is greatly shortened, export and not decay from center to edge image quality
, the digital picture that imaging results uniformity is very high.
Therefore, curved surface cmos image sensor camera module of the invention can meet high portability and hi-vision matter simultaneously
The demand of amount, efficiently solves the shortcomings of the prior art, is truly improving the globality of camera module system
Energy.
Brief description of the drawings
Fig. 1 is a kind of structural profile illustration of the FSI pel arrays of cmos image sensor of prior art；
Fig. 2 is a kind of structural profile illustration of the BSI pel arrays of cmos image sensor of prior art；
Fig. 3 is the comparison schematic diagram of opthalmic optics' structure and camera optical texture；
Fig. 4 is a kind of structural profile illustration of cmos image sensor camera module of the prior art；
Fig. 5 is the structural profile illustration of the curved surface cmos image sensor camera module in the embodiment of the present invention one；
Fig. 6 is the structural profile illustration of the curved surface cmos image sensor camera module in the embodiment of the present invention two；
Fig. 7 is the structural profile illustration of the curved surface cmos image sensor camera module in the embodiment of the present invention three.
Embodiment
Below in conjunction with the accompanying drawings, the embodiment of the present invention is described in further detail.
It should be noted that in following embodiments, when embodiments of the present invention are described in detail, in order to clear
Ground represents the structure of the present invention in order to illustrate, special that structure in accompanying drawing is not drawn according to general proportion, and has carried out part
Amplification, deformation and simplified processing, therefore, should avoid being understood in this, as limitation of the invention.
Embodiment one
In the present embodiment, referring to Fig. 5, Fig. 5 is the curved surface cmos image sensor shooting in the embodiment of the present invention one
The structural profile illustration of module.As shown in figure 5, the curved surface cmos image sensor camera module of the present invention includes what is be coupled
35 2 parts of main lens 46 and cmos image sensor.Main lens 46 eliminate ball based on double Gauss lens
Poor correcting lens.Therefore, eyeglass number reduces 3 than the double Gauss lens being typically made up of 6 eyeglasses, its from top to bottom according to
It is secondary including the first convex lens 45, concavees lens 44, the second convex lens 43.Wherein, first convex lens 45, the second convex lens 43 are
Single convex lens, its convex surface are set towards the lateral direction of 46 groups of the main lens, and the concavees lens 44 are biconcave lens.In primary mirror
After first 46 eliminate spherical aberration correcting lens, from incident light derived from the main lens 46, you can be changed into the main lens 46
Optical axis (i.e. the vertical center lines of main lens in figure) centered on divergent shape light project (in such as figure hollow arrow signified), this
From the direction of incident ray is different derived from typical 6 eyeglass double Gauss lens in Fig. 4.Also, by using without
The double Gauss lens of spherical aberration correction mirror is reduced to 3 as main lens, eyeglass number, is simplified the design of main lens 46, phase
Than the main lens 31 of prior art in Fig. 4, the height dimension of the main lens 46 in the present embodiment substantially reduces.
Please continue to refer to Fig. 5.The pel array of cmos image sensor 35 is designed based on FSI structures, including metal
Layer 47 and photosensitive layer 48, but eliminate filter layer.Therefore, the opposite face of the sensor 35 towards the main lens 46 is metal
The surface of layer 47.Identical with traditional FSI pel arrays, metal level 47 is provided with multi-layer metal wiring 38 (being illustrated as 4 layers), gold
Category layer 47 is respectively equipped with the vertical optical channel 41 and 37 being connected, the lower end connection PD of photosensitive layer optical channel 37 with photosensitive layer 48
(light sensitive diode) 36.With the something in common of traditional FSI pel arrays, the present embodiment is not reinflated repeat specification, please be joined
Fig. 1 is examined to be understood.In the present embodiment, the surface of metal level 47 is processed to a concave curvatures 40, with the main lens
The convex surface of second convex lens 43 of 46 bottoms is corresponding, each other opposite face.The concave curvatures 40 are with the main lens 46
It is symmetrical centered on optical axis；Each optical channel 41 is machined with from the concave curvatures 40 to the inner vertical of metal level 47, with sense
Each vertical optical channel 37 of photosphere 48 is respectively communicated with alignment, and the lower section of each optical channel 41,37 connects each of the photosensitive layer 48
PD36。
Please continue to refer to Fig. 5.In order to eliminate the metal line 38 of existing FSI pel arrays metal level 47 to incident ray
Reflex, 1 optical fiber 39 is respectively equipped with each optical channel 41,37, the use of optical fiber 39 can conduct visible ray
Flexible optical fibre.The lower end of each optical fiber 39 is coupled to corresponding PD36, and is tightly engaged into PD36.Can be used binder with
And other existing applicable patterns ensure that optical fiber 39 and PD36 are mutually closely sealed and connect.The upper end of optical fiber 39 is from metal level 47
The surface of concave curvatures 40 is exposed, and the inner couplings in the end of optical fiber 39 have 1 the color filter 42；Then, each optical fiber
39 upper end end face is coupled to together with the upper surface of the color filter 42 with the state perpendicular to the surface of the second convex lens 43
The convex surface of second convex lens of bottom 43 of main lens 46, and be tightly engaged into the convex surface of second convex lens 43.Each institute
Optical fiber 39 is stated to be evenly distributed on the convex surface of second convex lens 43 with the end face that the second convex lens 43 couple.Optical fiber 39 and face
It can be coupled between color filter 42 and between the convex surface of second convex lens 43 by the way of (Fuse) is for example merged,
Index matching glue also can be used if necessary to lift fusion performance；Or use binder and other existing applicable patterns
It is coupled.During alignment when being inserted into optical fiber 39 in optical channel 41,37 and being coupled with the second convex lens 43, it can adopt
, will using micro-control position table (its motor stepping is minimum) with such as free-space coupling technology (Free Space Coupling)
Optical fiber 39 is put into optical channel 41,37 and alignd with the position of optical channel；Also, using the technology have can by optical fiber with
The advantage that arbitrary surface is spliced, optical fiber 39 and the second convex lens 43 can be attached well.
As another implementation of the present embodiment, the color filter can optical fiber upper end close to the inside of end with
Optical fiber is coupled, and then, then the upper end end face of optical fiber is equably coupled with plumbness with the second convex lens.By such a side
Formula, there will be certain gap between the color filter and the second convex lens.In addition, also a kind of mode is, by the upper end of optical fiber
End coupling is carried out with the color filter, then, then the color filter is coupled with the second convex lens.That is, optical fiber is to pass through
The color filter is with plumbness uniformly coupled to the second convex lens.
In the present embodiment, the color filter array for the CIS pel arrays that the present invention discusses is (i.e. by whole the color filters 42
The color filter array of composition) also use Bayer pattern, the corresponding PD36 of a color filter 42 of each color.Numeral
The RAW data converts that PD36 is collected can be coloured image by the color interpolation algorithm in handling process.
The present invention makes the light path of incident light be actually formed at light by setting optical fiber in the optical channel of CIS pel arrays
In fibre, the incident light derived from main lens can be made not lose light intensity by metal layer reflection in the path for reaching photosensitive layer.
Because incident light can greatly improve almost without photosensitive region is arrived at reflectingly, the utilization rate of incident light, incident light letter can be achieved
Number high efficiency of transmission.
Please continue to refer to Fig. 5.The concave curvatures 40 of the sensor 35 have with the convex surface of the second convex lens 43 (i.e.
The opposite face of the main lens 46 and the concave curvatures 40) different curvature, i.e., the shape and primary mirror of described concave curvatures 40
The convex shape Incomplete matching of first 46 the second convex lens 43.Therefore, both described convex lens 43 of concave curvatures 40 and second
Between leave spacing, this spacing is the flange focal distance fd of the main lens 46.Curved surface cmos image of the invention in Fig. 5 is passed
The camera module of sensor camera module and the planar shaped cmos image sensor of prior art in Fig. 4 (has the primary mirror of 6 eyeglasses
Head) compare, present invention eliminates filter layer, it is corresponding with main lens that layer on surface of metal is designed as concave curvatures, as incidence
The plane of incidence of light, and optical fiber is coupled with the color filter, main lens are in turn coupled to, lenticule is instead of using main lens；And
And eyeglass number is set to be reduced to 3 as main lens by using the double Gauss lens without spherical aberration correction mirror.Therefore, it is of the invention
The flange focal distance fd of camera module main lens 46 is much smaller than the main lens flange focal distance fc of prior art, camera module of the present invention
Whole height ha almost shortens the height of half also much smaller than the whole height H of the camera module of prior art.
The present invention is exactly to be gained enlightenment as opthalmic optics' structure imaging system shown by Fig. 3, by the upper table of pel array
The retina of face mould personification eye is designed to that concave curvatures shape is corresponding with main lens, using be coupled with the optical fiber of the color filter without
It is optical channel to conduct incident light, each fiber end face is coupled in a vertical direction with primary mirror head surface, and it is equal in primary mirror head surface
Even distribution., can be with approximately parallel angle when the cmos image sensor 35 of the present invention couples with imaging main lens 46, will be from
It is several after the incident ray (hollow arrow is signified in such as figure) of divergent shape derived from main lens 46 is reduced by described the color filter 42
The array of light sensitive diode 36 is nondestructively transferred to by optical fiber 39, incident light is effectively reduced and enters in the edge of main lens 46
The reflex occurred when penetrating, the array of light sensitive diode 36 for enabling to couple with optical fiber 39 receive the incidence of uniform, high light intensity
Light.Because the oblique incidence light tolerance to shooting main lens 46 edge is higher so that the CMOS with concave curvatures 40 schemes
As sensor 35 can be as eyes imaging system, the more succinct lens design of matching optics structure --- the mirror of main lens
Piece quantity can reduce the half (i.e. such as 3 in the present embodiment) of at least a piece of, even original 6 numbers, and can protect simultaneously
The imaging demonstrate,proved under same view angle is more outstanding, so as to greatly shorten the flange focal distance of main lens and whole imaging system size
While, export digital picture do not decay from center to edge image quality, that imaging results uniformity is very high.
Therefore, curved surface cmos image sensor camera module of the invention can meet high portability and hi-vision matter simultaneously
The demand of amount, efficiently solves the shortcomings of the prior art, is truly improving the globality of camera module system
Energy.
Embodiment two
In the present embodiment, referring to Fig. 6, Fig. 6 is the curved surface cmos image sensor shooting in the embodiment of the present invention two
The structural profile illustration of module.As shown in fig. 6, the curved surface cmos image sensor camera module of the present invention includes what is be coupled
49 2 parts of main lens 46 and cmos image sensor.The design and implementation example one of main lens 46 is identical (therefore
Use identical numeral mark), equally based on double Gauss lens, but spherical aberration correcting lens is eliminated, eyeglass number is same
For 3.Main lens 46 include the first convex lens 45, concavees lens 44, the second convex lens 43 successively from top to bottom.Wherein, described
One convex lens 45, the second convex lens 43 are single convex lens, and its convex surface is set towards the lateral direction of 46 groups of the main lens, described
Concavees lens 44 are biconcave lens.After main lens 46 eliminate spherical aberration correcting lens, from incident light derived from the main lens 46,
The divergent shape light centered on the optical axis of the main lens 46 (i.e. the vertical center lines of main lens in figure) can be changed into penetrate
Go out (in such as figure hollow arrow signified), this with the direction of incident ray is derived from typical 6 eyeglass double Gauss lens in Fig. 4
Different.Also, 3 are reduced to, is made as main lens 46, eyeglass number by using the double Gauss lens without spherical aberration correction mirror
The design of main lens 46 is simplified, compared to the main lens 31 of prior art in Fig. 4, the height of the main lens 46 in the present embodiment
Size substantially reduces.
Please continue to refer to Fig. 6.The pel array of cmos image sensor 49 is designed based on BSI structures, including photosensitive
Layer 56 and metal level 57, but eliminate filter layer.Therefore, the opposite face of the sensor 49 towards the main lens 46 is photosensitive
The surface of layer 56.Identical with traditional BSI pel arrays, metal level 57 is provided with multi-layer metal wiring 50 (being illustrated as 4 layers), sense
Photosphere 56 is communicated with PD (light sensitive diode) 51 vertical optical channel 52.With the something in common of traditional BSI pel arrays, sheet
Embodiment is not reinflated repeat specification, refer to Fig. 2 and is understood.In the present embodiment, the surface of photosensitive layer 56 is processed
It is corresponding with the convex surface of the second convex lens 43 of the bottom of main lens 46 into a concave curvatures 53, opposite face each other.Institute
It is symmetrical centered on the optical axis of the main lens 46 to state concave curvatures 53；From the concave curvatures 53 into photosensitive layer 56
Portion is machined with each optical channel 52 vertically, and the lower section of each optical channel 52 correspondingly connects each PD51 of the photosensitive layer 56.
Please continue to refer to Fig. 6.Show to effectively suppress existing crosstalk between the pixel cell of existing BSI pel arrays
As being respectively equipped with 1 optical fiber 54 in each optical channel 52, the use of optical fiber 54 can conduct the flexible optical fibre of visible ray.
The lower end of each optical fiber 54 is coupled to corresponding PD51, and is tightly engaged into PD51.Binder can be used and other are existing
Applicable pattern ensure that optical fiber 54 and PD51 are mutually closely sealed and connect.The upper end of optical fiber 54 is bent from the spill of photosensitive layer 56
The surface of face 53 is exposed, and the inner couplings in the end of optical fiber 54 have 1 the color filter 55；Then, the upper end end of each optical fiber 54
Face is together with the upper surface of the color filter 55 to be coupled to the main lens perpendicular to the state on the surface of the second convex lens 43
The convex surface of 46 the second convex lens of bottom 43, and be tightly engaged into the convex surface of second convex lens 43.Each optical fiber 54 with
The end face of second convex lens 43 coupling is evenly distributed on the convex surface of second convex lens 43.Optical fiber 54 and the color filter 55 it
Between and can be coupled by the way of (Fuse) is for example merged between the convex surface of second convex lens 43, may be used also if necessary
Using index matching glue lifting fusion performance；Or it is coupled using binder and other existing applicable patterns.
When optical fiber 54 is inserted into the alignment in optical channel 52 and when being coupled with the second convex lens 43, it can use for example freely empty
Between coupling technique (Free Space Coupling), optical fiber 54 is put into light using micro-control position table (its motor stepping is minimum)
Passage 52 is simultaneously alignd with the position of optical channel；Also, optical fiber and arbitrary surface can be spelled using what the technology had
The advantage connect, optical fiber 54 and the second convex lens 43 can be attached well.
As another implementation of the present embodiment, the color filter can optical fiber upper end close to the inside of end with
Optical fiber is coupled, and then, then the upper end end face of optical fiber is equably coupled with plumbness with the second convex lens.By such a side
Formula, there will be certain gap between the color filter and the second convex lens.In addition, also a kind of mode is, by the upper end of optical fiber
End coupling is carried out with the color filter, then, then the color filter is coupled with the second convex lens.That is, optical fiber is to pass through
The color filter is with plumbness uniformly coupled to the second convex lens.
In the present embodiment, the color filter array for the CIS pel arrays that the present invention discusses is (i.e. by whole the color filters 55
The color filter array of composition) also use Bayer pattern, the corresponding PD51 of a color filter 55 of each color.Numeral
The RAW data converts that PD51 is collected can be coloured image by the color interpolation algorithm in handling process.
The present invention makes the actual shape of light path of incident light by setting optical fiber in the optical channel of CIS pel array photosensitive layers
Into in optical fiber, can not only making derived from main lens incident light not lose light intensity in the path for reaching photosensitive layer, moreover,
Using the shielding action of optical fiber, it can effectively suppress existing crosstalk phenomenon between pixel cell.
Please continue to refer to Fig. 6.The concave curvatures 53 of the sensor 49 have with the convex surface of the second convex lens 43 (i.e.
The opposite face of the main lens 46 and the concave curvatures 53) different curvature, i.e., the shape and primary mirror of described concave curvatures 53
The convex shape Incomplete matching of first 46 the second convex lens 43.Therefore, both described convex lens 43 of concave curvatures 53 and second
Between leave spacing, this spacing is the flange focal distance fe of the main lens 46.Curved surface cmos image of the invention in Fig. 6 is passed
The camera module of sensor camera module and the planar shaped cmos image sensor of prior art in Fig. 4 (has the primary mirror of 6 eyeglasses
Head) compare, present invention eliminates filter layer, it is corresponding with main lens that photosensitive layer surface is designed as concave curvatures, as incidence
The plane of incidence of light, and optical fiber is coupled with the color filter, main lens are in turn coupled to, lenticule is instead of using main lens；And
And eyeglass number is set to be reduced to 3 as main lens by using the double Gauss lens without spherical aberration correction mirror.Therefore, it is of the invention
The flange focal distance fe of camera module main lens 46 is much smaller than the main lens flange focal distance fc of prior art, camera module of the present invention
Whole height hb almost shortens the height of half also much smaller than the whole height H of the camera module of prior art.
In the present embodiment, the present invention simulates the photosensitive layer upper surface of pel array the retina design concavity of human eye
Curve form is corresponding with main lens, conducts incident light, Jiang Geguang using the optical fiber rather than optical channel that are coupled with the color filter
Fine end face couples in a vertical direction with primary mirror head surface, and is uniformly distributed in primary mirror head surface.When the cmos image of the present invention passes
, can be with approximately parallel angle, by from the incidence of divergent shape derived from main lens 46 when sensor 49 couples with shooting main lens 46
After light (hollow arrow is signified in such as figure) is reduced by described the color filter 55, sense is nondestructively almost transferred to by optical fiber 54
The array of optical diode 51, the reflex that incident light occurs in 46 edge incidence of main lens is effectively reduced, so as to disappear
Except BSI arrays can not thoroughly solve the problems, such as to respond during Ray obliquity incidence poor, it can also make photosensitive two with fiber coupling
Pole pipe array can receive the incident light of light intensity be more uniformly distributed, high.Moreover, using the shielding action of optical fiber, can effectively suppress
Existing crosstalk phenomenon between BSI pixel cells.Because the oblique incidence light tolerance to shooting main lens 46 edge is higher, make
There must be the cmos image sensor 49 of concave curvatures 53 can be as eyes imaging system, matching optics structure is more succinct
Lens design --- the number of lenses of main lens can reduce the half of at least a piece of, even original 6 numbers (i.e. such as this reality
Apply 3 in example), and can ensure that the imaging under same view angle is more outstanding simultaneously, so as to greatly shorten the flange of main lens
While focal length and whole imaging system size, do not decay from center to edge image quality, imaging results one are exported
The very high digital picture of cause property.
Embodiment three
In the present embodiment, referring to Fig. 7, Fig. 7 is the curved surface cmos image sensor shooting in the embodiment of the present invention three
The structural profile illustration of module.As shown in fig. 7, the present embodiment is another implementation of embodiment one.The present embodiment with
It is in place of the difference of embodiment one, the surface of the concave curvatures 40 of the metal level 47 of the sensor 35 has and institute
State the convex surface identical curvature of the second convex lens 43 of main lens 46, i.e., the of the shapes of described concave curvatures 40 and main lens 46
The convex shape of two convex lens 43 matches completely.Therefore, the concave curvatures 40 fit between the two with the second convex lens 43
Coupling, completely without spacing.That is, now the flange focal distance of the main lens 46 is zero.Accordingly, the optical fiber 39
Upper end no longer expose, but be retracted the optical channel 41 on the surface of the concave curvatures 40 of the metal level 47, and each light
The upper end end face of fibre 39, the upper surface of described the color filter 42 of its end face inner couplings and the surface of concave curvatures 40 are formed altogether
The curved surface in face, and the convex surface with second convex lens 43 fits simultaneously.
Therefore, in the case of curved surface cmos image sensor height identical, the curved surface cmos image in the present embodiment passes
The whole height of sensor camera module has further reduction relative to embodiment one.
Other structures and the function realization of the present embodiment are identical with embodiment one, therefore not reinflated explanation, refer to implementation
Example one is understood.
It should be noted that in the case where designing needs, the another of such as form of embodiment three can also be used to embodiment two
A kind of implementation, even if the concave curvatures surface of the photosensitive layer of the sensor has the with the main lens
The convex surface identical curvature of two convex lens, makes the concave curvatures be fitted between the two with the second convex lens and couples, the master
The flange focal distance of camera lens is similarly zero.Those skilled in the art can be implemented with reference to the above embodiment of the present invention, therefore not
Expansion explanation is carried out again.
Above-described is only the preferred embodiments of the present invention, the embodiment and the patent guarantor for being not used to the limitation present invention
Scope, therefore the equivalent structure change that every specification and accompanying drawing content with the present invention is made are protected, similarly should be included in
In protection scope of the present invention.
Claims (10)
- A kind of 1. curved surface cmos image sensor camera module, it is characterised in that including：Main lens, the main lens are the double Gauss lens without spherical aberration correction mirror；Cmos image sensor, located at the lower section of the main lens, the pel array of the sensor include color filter array, Metal level and photosensitive layer, the sensor cover are concave curvatures to the opposite face of the main lens, and the concave curvatures are with described It is symmetrical centered on the optical axis of main lens, and with the lower end convex surfaces of main lens opposite face each other；From the concave curvatures It is provided inwardly with being respectively communicated with the optical channel of each light sensitive diode of the photosensitive layer, optical fiber is provided with the optical channel, it is each described Optical fiber lower end is coupled to the light sensitive diode, and upper end couples with the corresponding color filter of the color filter array, and uniformly Coupled to the opposite face of the main lens；Wherein, the incident light derived from the main lens, each optical fiber can be entered in divergent shape, and passes through described the color filter After reduction, the light sensitive diode is arrived at along the optical fiber.
- 2. curved surface cmos image sensor camera module according to claim 1, it is characterised in that the main lens are from upper Including the first convex lens, concavees lens, the second convex lens under and successively, first convex lens, the second convex lens are single convex lens, Its convex surface is set towards the lateral direction of the main lens, and the concavees lens are biconcave lens, second convex lens it is described The concave curvatures of convex surface and sensor opposite face each other；The upper end of each optical fiber couples with described the color filter, And the opposite face of the main lens is uniformly coupled to plumbness.
- 3. curved surface cmos image sensor camera module according to claim 1 or 2, it is characterised in that each optical fiber Upper end by described the color filter with plumbness uniformly be coupled to the main lens opposite face.
- 4. curved surface cmos image sensor camera module according to claim 1 or 2, it is characterised in that each optical fiber Upper end proximal end face at inner couplings have described the color filter, and with plumbness uniformly coupled to the relative of the main lens Face.
- 5. curved surface cmos image sensor camera module according to claim 1 or 2, it is characterised in that each optical fiber The inner couplings of upper end end have described the color filter, and be uniformly coupled to plumbness together with described the color filter The opposite face of the main lens.
- 6. curved surface cmos image sensor camera module according to claim 1 or 2, it is characterised in that the sensor The concave curvatures there is the curvature different from the opposite face of the main lens.
- 7. curved surface cmos image sensor camera module according to claim 6, it is characterised in that the institute of the sensor The opposite face for stating concave curvatures and the main lens has spacing, and the spacing is equal to the flange focal distance of the main lens.
- 8. curved surface cmos image sensor camera module according to claim 1 or 2, it is characterised in that the sensor The concave curvatures there is opposite face identical curvature with the main lens.
- 9. curved surface cmos image sensor camera module according to claim 8, it is characterised in that the institute of the sensor State concave curvatures and the opposite face of the main lens fits, the flange focal distance of the main lens is zero.
- 10. curved surface cmos image sensor camera module according to claim 1, it is characterised in that the sensor cover To the concave curvatures that the opposite face of the main lens is the metal level or the photosensitive layer.
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| CN104965294B (en) * | 2015-08-03 | 2017-06-16 | 江苏南大五维电子科技有限公司 | A kind of big visual field miniaturization imaging system |
| CN105185800B (en) * | 2015-08-19 | 2017-08-25 | 启芯瑞华科技（武汉）有限公司 | Cmos image sensor and its manufacture method |
| CN106973203B (en) * | 2017-04-21 | 2020-11-17 | 华为机器有限公司 | Camera module |
| CN208063324U (en) | 2017-04-27 | 2018-11-06 | 爱佩仪光电技术有限公司 | The lens control device of configuration in an imaging device |
| CN108111732A (en) * | 2017-12-27 | 2018-06-01 | 信利光电股份有限公司 | A kind of camera module |
| CN108769477A (en) * | 2018-06-07 | 2018-11-06 | 信利光电股份有限公司 | A kind of camera module |
| CN109151273B (en) * | 2018-08-27 | 2020-09-04 | 彭波 | Fan stereo camera and stereo measurement method |
| CN110049218A (en) * | 2019-04-19 | 2019-07-23 | 信利光电股份有限公司 | Imaging method, device, system and the readable storage medium storing program for executing of flexible sensor |
| CN110579858A (en) * | 2019-08-12 | 2019-12-17 | 西北大学 | Mobile phone lens and preparation method thereof |
| CN113766097A (en) * | 2020-06-05 | 2021-12-07 | 中兴通讯股份有限公司 | Camera, camera control method, terminal, electronic device and storage medium |
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