CN105842961B - A kind of optical filter, camera module and its manufacturing method - Google Patents
A kind of optical filter, camera module and its manufacturing method Download PDFInfo
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- CN105842961B CN105842961B CN201510019726.4A CN201510019726A CN105842961B CN 105842961 B CN105842961 B CN 105842961B CN 201510019726 A CN201510019726 A CN 201510019726A CN 105842961 B CN105842961 B CN 105842961B
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Abstract
The present invention provides a kind of optical filter that can prevent camera module from generating stray light and the camera module using the optical filter, while also providing its manufacturing method.The camera module includes a camera lens, one bracket of fixed lens, an optical filter below camera lens, and the image sensor below optical filter, wherein optical filter includes a cutoff filter and a light-shielding film, and light-shielding film is set to cutoff filter, has a windowing among light-shielding film, it is able to form a transmission region among cutoff filter, forms a light blocking region except transmission region.
Description
Technical field
The present invention relates to camera module fields, more particularly to a kind of effectively interception to be incident to the gold on image sensor periphery
The optical filter of the light of the inner wall of the light and lens bracket on line surface and the camera module for using the optical filter.
Background technique
As mobile phone camera module develops to high pixel, large aperture, ultrathin direction, consumer is to camera module at image quality
The requirement of amount is also higher and higher.Existing mobile phone camera module is as shown in Figure 1, include a camera lens 10, the bracket of fixed lens 10
11, the optical filter 12 set on 10 lower section of camera lens, the image sensor 13 set on 12 lower section of optical filter, and and image sensing
The wiring board 14 that device 13 electrically connects.Optical filter 12 is mainly cutoff filter, and effect is infrared in filtering light
Light makes camera module imaging effect close to eyes imaging effect.
But also frequently there is the problem of stray light when shooting in existing camera module.Fig. 2 is shown when light source moves
Out 35 °~40 ° of imaging surface when, the stray light of aubergine is presented in the edge of imaging surface corresponding position, this problem affects mobile phone
The image quality of camera module.The main reason for being researched and analysed, causing this problem is that high angle scattered light is incident on image sensing
The stray light that reflection generates, which occurs, for the gold thread surface or 11 inner wall of bracket that device 13 and wiring board 14 connect causes.As shown in Figure 1, light
Line is reflected at the elevated regions 111 at the windowing edge of bracket 11, or is connect with wiring board 14 and image sensor 13
Enter inside camera module after being reflected at the surface region 141 of several gold threads and be imaged by image sensor 13, to cause
Stray light.
Summary of the invention
The main purpose of the present invention is to provide a kind of camera module, which can effectively intercept and be incident to shadow
As the light of the inner wall of the light and lens bracket on the gold thread surface of sensor perimeter, this part interference light is prevented to be reflected onto
The effective coverage of image sensor is to form stray light in imaging.
It is another object of the present invention to provide a kind of camera module, the camera module by an optical filter will likely
Interference light stops, and avoids in the other elements that this some light is incident in camera module, is passed by multiple reflections to image
The effective coverage of sensor, influences image quality.
It is another object of the present invention to provide a kind of optical filters, can be with when which is installed on a camera module
The interference light for being possible to cause stray light is intercepted, is avoided in the other elements that this some light is incident in camera module,
Stray light is formed by the effective coverage of multiple reflections to image sensor.
To achieve the above objectives, the present invention provides a kind of camera module mould group, including a camera lens, fixes the one of the camera lens
Bracket, the optical filter below the camera lens, and the image sensor below the optical filter, wherein described
Optical filter includes a cutoff filter and a light-shielding film, and the light-shielding film is set to the cutoff filter, described
There is a windowing among light-shielding film, be able to form a transmission region among the cutoff filter, in the transparent area
A light blocking region is formed except domain.
Preferably, the light-shielding film is annular, and the inside casing of the light-shielding film forms the windowing, and the light-shielding film is along institute
The edge for stating cutoff filter is set to the upper surface of the cutoff filter.
Preferably, the inside casing size of the light-shielding film is calculated by following steps: according to each of the camera module
Parameter calculates the simulation image height of each visual field chief ray, glazed thread and lower light, using the maximum analog image height in each visual field as institute
State the inside casing size of light-shielding film.
Preferably, the bracket extends inwardly an erecting bed, forms a window, the optical filter among the erecting bed
It is installed on the erecting bed, the upright projection of the light-shielding film outline border is on the erecting bed.
Preferably, the light-shielding film is coated on the cutoff filter by yellow light process technique or silk screen printing process,
When using the yellow light process technique, the shape of the light shield used is identical as the light-shielding film, when using the silk screen printing process,
The shape of the saturating inked areas of the screen printing forme used is identical as the light-shielding film.
Preferably, the light-shielding film with a thickness of 2 μm~12 μm.
Preferably, the light-shielding film is a kind of black absorbing material, 95% or more luminous energy is can absorb, less than 0.2%
Light-transmissive, the luminous energy less than 3.5% reflected.
Preferably, the camera module further comprises a wiring board, and the wiring board passes through with the image sensor
The electrical connection of several gold threads.
The present invention also provides a kind of optical filter, the optical filter is adapted to be mounted to a camera module, the camera module packet
The camera lens being set to above the optical filter is included, a bracket of the camera lens, and one below the optical filter are fixed
Image sensor, the optical filter include a cutoff filter and a light-shielding film, and the light-shielding film is set to described infrared
Edge filter, the light-shielding film centre have a windowing, are able to form a transparent area among the cutoff filter
Domain forms a light blocking region except the transmission region.
The present invention also provides a kind of manufacturing method of the optical filter of camera module, the method includes the steps: (a) it is arranged one
Cyclic annular light-shielding film is able to form a light transmission among the cutoff filter in the cutoff filter of a camera module
Region forms a light blocking region except the transmission region.
Preferably, the light-shielding film is set to a camera lens opposite one of the cutoff filter with the camera module
The surface of side.
It preferably, further include step (b) and/or (c) before the step (a), wherein step (b) are as follows: determine described light-blocking
The inside casing size of film obtains so as to be directly entered an image sensing of the camera module by the light of the light-shielding film inside casing
Device；Step (c) are as follows: the frame size for determining the light-shielding film obtains so that the upright projection of the light-shielding film outline border is in installation
On one erecting bed of the optical filter.
Preferably, the inside casing size of the light-shielding film is determined in step (b) the following steps are included:
(b1) according to the optical path situation of the camera lens internal optics simulate to obtain each visual field chief ray, on
The angle of light and lower light；
(b2) radius of curvature, the camera lens to the optical filter of the last face lens of the camera lens are obtained
Distance, the refractive index of the distance of the optical filter to the image sensor and the optical filter and
Thickness；
(b3) the simulation image height of each visual field chief ray, glazed thread and lower light is calculated according to above-mentioned parameter, with
Inside casing size of the maximum analog image height as the light-shielding film in each visual field.
Preferably, further include the steps that the correction window size after step (b3): when (b4) is according to processing procedure
Assembling deviation increases corresponding offset in the size of the windowing obtained in step (b3), and what is corrected described opens
The size of window.
Preferably, in step (a), the light-shielding film is coated on by the IR cut filter using yellow light process technique
Piece surface, specifically includes the following steps: cleaning and drying the cutoff filter；It is applied on aforementioned cutoff filter
Bottom；The spin coating photoresist on aforementioned cutoff filter；To the soft baking of aforementioned cutoff filter；Aforementioned infrared cutoff is filtered
Mating plate carries out alignment exposure；It is dried after being carried out to aforementioned cutoff filter；Develop to aforementioned cutoff filter；It is right
Aforementioned cutoff filter is dried firmly；Aforementioned cutoff filter is etched to form the optical filter.The light
Photoresist is black absorbing material, can absorb 95% or more luminous energy, the light-transmissive less than 0.2%, the luminous energy less than 3.5%
It is reflected.
Preferably, in step (a), the light-shielding film is coated on by the cutoff filter table using silk screen printing process
Face, specifically includes the following steps: ink is coated on the cutoff filter by screen printing forme；Toast aforementioned infrared section
Only optical filter obtains the optical filter.The ink is black absorbing material, can absorb 95% or more luminous energy, is less than
0.2% light-transmissive, the luminous energy less than 3.5% are reflected.
Detailed description of the invention
Fig. 1 is the cross-sectional view of existing camera module.
Fig. 2 is the simulation schematic diagram that existing camera module generates interference light phenomenon when there is high angle scattered light incidence.
Fig. 3 is the cross-sectional view of a preferred embodiment of camera module according to the present invention.
Fig. 4 is the schematic diagram of a preferred embodiment of optical filter according to the present invention.
Shown in fig. 5 is optical path simulation drawing when calculating the size of light-shielding film of the invention.
Shown in fig. 6 is camera module of the invention and traditional camera module in comparison diagram in actual work.
Specific embodiment
It is described below for disclosing the present invention so that those skilled in the art can be realized the present invention.It is excellent in being described below
Embodiment is selected to be only used as illustrating, it may occur to persons skilled in the art that other obvious modifications.It defines in the following description
Basic principle of the invention can be applied to other embodiments, deformation scheme, improvement project, equivalent program and do not carry on the back
Other technologies scheme from the spirit and scope of the present invention.
Shown in Fig. 3 is a kind of camera module of the invention.The camera module includes a camera lens 20, the fixed camera lens
20 bracket 21, the optical filter 22 set on 20 lower section of camera lens, the image sensing set on 22 lower section of optical filter
Device 23, and the wiring board 24 electrically connected with the image sensor 23.Several gold threads 25 are provided on the wiring board 24.
As shown in Figure 3 and Figure 4, the optical filter 22 includes a cutoff filter 221 and a light-shielding film 222, institute
Light-shielding film 222 is stated above or below the cutoff filter 221, there is a windowing among the light-shielding film 222
2221, it is able to form a transmission region among the cutoff filter 221, forms a gear except the transmission region
Light region.The transmission region is to be and 222 phase of light-shielding film with 2221 opposite regions of the windowing, the light blocking region
Pair region can pass through the optical filter 22 when light is incident to the transmission region, when light is incident to the light-blocking region
When domain, light is stopped by the light-shielding film 222, cannot penetrate the optical filter 22.
The cutoff filter 221 is mainly used for intercepting the infrared light in incident ray, prevents infrared in light
Light is incident on the image sensor 23, influences the quality of image color.
The light-shielding film 222 is ring-type, and the inside casing of the light-shielding film 222 forms the windowing 2221, due to described light-blocking
Film 222 is ring-type, therefore the light-shielding film is set to the edge of the cutoff filter 221, is filtered in the infrared cutoff
The edge of mating plate 221 forms the light blocking region, forms the transmission region among the cutoff filter 221.Institute
It states light-shielding film 222 to prepare using light-proof material, therefore the light-shielding film 222 makes the edge of the optical filter 22 opaque,
The light for being incident to 22 edge of optical filter is avoided through the optical filter 22.In the cutoff filter 221
The purpose that the light-shielding film 222 is arranged in edge is: cause spuious optical phenomenon interference light be largely wide-angle incidence
Light, the interference light is mainly incident to the marginal position of the optical filter 22 after through the camera lens 20, if described
Interference light can penetrate the optical filter 22, and the interference light may be incident to the inner wall or the gold of the bracket 21
The surface of line 25 generates stray light in imaging then by being reflected into the image sensor 23.Therefore in the optical filtering
The edge of piece 22 is arranged the light-shielding film 222 and is conducive to prevent the interference light through the optical filter 22.
The light-shielding film 222 may be disposed above or below the cutoff filter 221, and playing prevents from being incident to
The interference light at 22 edge of optical filter penetrates the function of the optical filter 22.Preferably, the light-shielding film 222
It is set to the top of the cutoff filter 221, namely is set to the cutoff filter 221 and 20 phase of camera lens
Pair side, be able to incident ray enter the cutoff filter 221 before just the interference light is stopped.
The optical filter 22 can be set to the lower section of the camera lens 20 by the bracket 21, can also be supported by other elements
Set on the lower section of the camera lens 20.Preferably, the optical filter 22 stays at the lower section of the camera lens 20 by 21, the bracket.
Preferably, the bracket 21 extends inwardly an erecting bed 211, and the optical filter 22 is consolidated by the erecting bed 211
Due between the camera lens 20 and the image sensor 23, forming a window, the optical filter 22 among the erecting bed 211
The windowing 2221 be located in the region of the window, the optical filter 22 can pass through the edge of upper surface and the erecting bed
211 connections so that the erecting bed 211 is in the top of the optical filter 22, can also by the edge of lower surface with it is described
Erecting bed 211 connects, so that the erecting bed 211 is in the lower section of the optical filter 22.The optical filter 22 passes through splicing
Mode is fixed on the erecting bed 211, and the part that the optical filter 22 is connect with the erecting bed 211 is to draw glue region.True
When the frame size of the fixed light-shielding film 222, need to consider the size of the size for drawing glue region namely the erecting bed,
Particular content is introduced in the part below.
In addition, the optical filter 22 can not also be fixed in the bracket 21 by the erecting bed 211, the optical filtering
Piece 22 is directly glued by its lateral edge in the inner wall of the bracket 21, at this point, the frame size of the light-shielding film 222 is not required to
Consider described stroke of glue region, the frame size of the light-shielding film 222 is identical as the size of the cutoff filter 221.
The light-shielding film 222 can be lighttight self-supporting material, can be supported by the bracket 21 and be set to institute
State the upper surface or lower surface of optical filter 22.The light-shielding film 222 can also be covered in the cutoff filter 221, and
The light-shielding film 222 is fixed on 221 surface of cutoff filter by bonding agent.
The light-shielding film 222 can also be lighttight coating, and the light-shielding film 222 is filtered coated on the infrared cutoff
The upper surface or lower surface of mating plate 22.Can simplify when the light-shielding film 222 is using impermeable optical coating the camera module and
The structure of the optical filter 22, while better light blocking effect can also be played.Preferably, the light-shielding film 222 is using impermeable
Optical coating, the light-shielding film 222, which is coated on the cutoff filter 221, can be used a variety of coating methods, presented below
Two kinds of embodiments by the light-shielding film 222 coated on the cutoff filter 221.
Embodiment 1.
The light-shielding film 222 is coated on the surface of the cutoff filter 221, photolithography method by the method for photoetching
Namely traditional yellow light process technique.
The photoresist that yellow light process technique uses is photosensitive material, and photoresist has unique characteristic, in the effect of UV light
Under, it may occur that chemical change becomes the substance for being soluble in acid or alkali.Photoresist is applied on substrate, the shape needed according to product
Shape provides corresponding light shield, and light shield is covered on photoresist, is then exposed to photoresist, so that not covered by light shield
Chemical change occurs for photoresist region, and then this part photoresist acid or alkali are dissolved or retained, is formed and light shield shape
The identical or complementary figure of shape.
The photoresist that the present invention uses is that impermeable optical coating also has in addition to the photobehavior with traditional photoresist
Lighttight characteristic.
Light shield of the invention can also be used and institute using cyclic annular light shield identical with 222 shape of photomask
The identical light shield of 2221 shape of the windowing for stating photomask 222, the region for only needing to dissolve after exposure is different, needs
The solvent of use is also different.Preferably, the light shield is being made of cyclic annular light shield identical with 222 shape of photomask
Shi Suoshu photoresist is applied to the cutoff filter 221, and the light shield is covered on the photoresist and is exposed, and is exposing
It needs the intermediate photoresist removal that chemical change occurs forming the light-shielding film by the covered region of the light shield after light
222, the frame size of the light shield is the frame size of the photomask 222, and the inside casing size of the light shield is described
The inside casing size of photomask 222.
Specific yellow light process technique can comprise the following steps that 1. surface treatments, including clean and dry described infrared section
Only optical filter 221；2. linging；3. spin coating photoresist, the photoresist is equably coated on the infrared cutoff and filtered by this step
Mating plate surface；4. soft baking；5. alignment exposure；It is dried after 6.；7. development；8. hard dry；9. etching.
It can reach 25 μm using the precision that the yellow light technique coats the light-shielding film 222, be amplified to 85 under the microscope
Times when, the edge of the light-shielding film 222 is smoother, and corner squareness is preferable.When using the yellow light technique, the light-shielding film
222 thickness can accomplish 2 μm~3 μm.
Embodiment 2.
The light-shielding film 222 is coated on the cutoff filter 221 by silk screen printing process.The oil used when silk-screen
Ink is light-proof material, and the ink is coated on to the light blocking region of the cutoff filter 221 by silk screen printing process, from
And form the light-shielding film 222.The silk screen printing process can by the saturating ink of mesh of screen printing forme blacking position, transmission region
The basic principle of the impermeable ink of mesh is printed.
The shape of the black part permeable to oil of the screen printing forme and the shape of the light-shielding film 222 should be consistent, are one cyclic annular.
The impermeable ink of the other parts of the screen printing forme.In production, first by the screen printing forme and the IR cut filter
Piece 221 is aligned, and the ink is poured on the screen printing forme, applies certain pressure to the ink with scraper plate is scraped, makes
The ink is expressed on the cutoff filter 221 by the mesh of the screen printing forme, so that the ink be applied
It is layed onto 221 surface of cutoff filter.Subsequent step further includes baking etc..
It can reach 35 μm using the precision that the silk screen printing process coats the light-shielding film 222, be amplified to 85 under the microscope
Times when, the edge of the light-shielding film 222 is rougher, and corner right angle is shown as arc-shaped, but overall to the camera module performance
Influence it is little.When using the silk screen printing process, the thickness of the light-shielding film 222 can accomplish 7 μm~12 μm.
The silk screen printing process is compared with the yellow light technique, and manufacture craft is simple, and cost is relatively low, although precision is poor,
It is the required precision for being also sufficient for general camera module.Therefore, it can be selected according to required precision of the camera module etc.
Select suitable technique.Yellow light process technique, general mould can be selected for high-precision module group procedure and ultra-thin scheme mould group
Group process requirements can select silk screen printing process.
Both examples above is directed to described when light-proof material is coated on the cutoff filter 221
The size shape of light-shielding film 222.The size for determining the light-shielding film 222 determines the inside casing size of the light-shielding film 222 and outer
Frame size.
When the optical filter 22 is installed on the erecting bed 211, the vertical throwing of the outline border of the light-shielding film 222 should be made
Shadow is located on the erecting bed namely edge of the erecting bed 211 and is within the drop shadow spread of the light-shielding film 222, institute
Stating between the edge of erecting bed 211 and the upright projection of the light-shielding film 222 does not have gap, so that it is described to avoid light from penetrating into
The inner wall of the bracket 21 is incident at interval between the outline border of light-shielding film 222 and the erecting bed 211.
The inside casing size of the light-shielding film 222 is the size of the windowing 2221.If the windowing 2221 is too small,
The dark angle of imaging region can be generated, if the windowing is 2221 excessive, may holiday interference light, to cause spuious
Optical phenomenon.The optimum size of the windowing 2221 can be tested by optical path or sunykatuib analysis obtains.A kind of calculating presented below
The method of 2221 sizes of the windowing:
A) according to the optical path situation of 20 internal optics of camera lens simulate to obtain each visual field chief ray, glazed thread and
The angle of lower light；
B) radius of curvature, the camera lens 20 to the optical filter 22 of the last face lens of the camera lens 20 are obtained
Distance, the optical filter 22 arrive the image sensor 23 distance, the refractive index and thickness of the optical filter 22；
C) the simulation image height of each visual field chief ray, glazed thread and lower light is calculated, according to above-mentioned parameter with main in each visual field
Size of the maximum simulation image height of light, glazed thread and lower light as the windowing 2221.
It is illustrated in figure 5 the simulation drawing for calculating size of the windowing 2221 in wide direction.The camera lens is simulated first
20 in the chief ray in each visual field direction, the angle of glazed thread and lower light, as figure in a visual field chief ray, glazed thread and under
The angle of light is (θ1、θ2、θ3), the angle of chief ray, glazed thread and lower light is (θ in another visual field4、θ5、θ6)；Then
Simulation obtains the radius of curvature (r) of the last one side of the camera lens 20；Then it according to each parameter of the camera module, obtains described
Camera lens 20 arrives the distance (L of the optical filter 221), the distance (L of the optical filter to the image sensor 232), the optical filtering
The thickness (t) of the refractive index (n) of piece 22 and the optical filter 22；According to key light in above each each visual field of parameter calculating simulation
The simulation image height of line, glazed thread and lower light, the photofit picture height in a visual field are respectively (H1、H2、H3), another visual field
In photofit picture height be respectively (H4、H5、H6), compare H1、H2、H3、H4、H5、H6Size, maximum simulation image height HmaxAs institute
Windowing 2221 is stated in the size in the visual field direction.High direction and the diagonal of the windowing 2221 are calculated with same method
Size, thus obtain the size of the windowing 2221, it should be having a size of the size for not influencing the camera module real scene shooting imaging.
When the size of the windowing 2221 is the minimum dimension that above-mentioned simulation obtains, the interference light is blocked in institute
It states except windowing 2221, namely the interference light on 25 surface of 21 inner wall of bracket and the gold thread may be incident on by the gear
Light film 222 stops, and the optical filter 22 cannot be penetrated, so as to avoid stray light.
Above-mentioned simulation process is with the center at the center of the optical filter 22 and the camera lens 20 and the image sensor 23
Premised on same optical axis namely the center of the windowing 2221 of the photomask 222 and the camera lens 20 and the shadow
As the center of sensor 23 is in same optical axis.It is contemplated that can have assembling deviation in actual manufacturing process, such as
The optical filter 22 and the bracket 21 attach offset, the bracket 21 and the wiring board 24 and attach offset, the camera lens 20
Attaching offset etc., at this moment if the photomask 222 is arranged according further to the size that above-mentioned simulation calculates, may result in omission
Part interference light leads to that dark angle is imaged, accordingly, it is determined that when the size of the photomask 222 and position, it is contemplated that
This partial offset amount, offset is added in size design, to obtain the size of the optimal windowing 2221.
By calculating the size of the optimal windowing 2221, so that being incident on the optical filter 22 by the camera lens 20
The light of the transmission region can enter the image sensor 23 directly, without barrier and be imaged, and the interference light
Line is then stopped by the light-shielding film 222.
The light-shielding film 222, which can will be incident to the interference light thereon, to be stopped, but if only described will be done
Disturb light reflection, the multiple reflections of interference light other elements in the camera module, it is also possible to be incident to described
Transmission region is imaged hence into the image sensor 23, influences image quality.Therefore, it is preferable to will be incident to described light-blocking
The interference light of film 222 absorbs, it is prevented to be again incident on the transmission region by reflection.
Preferably, the light-shielding film 222 is a kind of black material, 95% or more luminous energy can be effectively absorbed, less than 0.2%
Light-transmissive, the luminous energy less than 3.5% reflected.Since the energy for penetrating and reflecting is relatively small, it is contemplated that optical path stroke
In energy loss, therefore be incident on the energy of 23 effective coverage of image sensor through the light-shielding film 222 and can neglect
Slightly disregard.Therefore the light for being incident to the light-shielding film 222 is substantially stopped by the light-shielding film 222.
In addition, it is noted that since the black material for manufacturing the light-shielding film 222 is organic material, in practical system
Unusable acid, alkali soluble agent in journey, alcohol, acetone and other organic solvent wiping, the light-shielding film 222 is otherwise be easy to cause to dissolve,
Situations such as diluting, falling off.Since the light-shielding film 222 is convex-type colloid, the unavailable sharp objects in practical processing procedure
It touches, otherwise be easy to cause scuffing that colloid is caused to fall off, light leakage is imaged so as to cause camera module.
As shown in Fig. 6 the optical filter 22 of the invention and traditional optical filter are in comparison diagram in actual work.
The upper surface of the optical filter 22 is provided with the light-shielding film 222, and traditional optical filter does not have a light-shielding film, it is shown in figure enter
Penetrating light is that will form the interference light.
When the interference light is incident on the fringe region of traditional optical filter, entered by light a part of optical filter
It is mapped to the inner wall of the bracket 21, the image sensor 23 is reflected by 21 inner wall of bracket, due to this part
Light is the light by secondary reflection, so will affect image quality；Another part light is incident on the gold thread 25
Surface is reflected into the lower surface of the optical filter by the gold thread 25, using being reflected into for traditional optical filter lower surface
The image sensor 23, since this some light is also the light by multiple reflections, so image quality can finally be influenced.
When interference light is incident on the fringe region of the optical filter 22, since the fringe region of the optical filter 22 covers
Have the light-shielding film 222, the light-shielding film 222 blocks the interference light so that the interference light cannot pass through it is described
Optical filter 22.
The present invention also provides a kind of manufacturing methods of the optical filter of camera module comprising step: a cyclic annular gear (a) is arranged
Light film 222 is able to form one among the cutoff filter 221 in the cutoff filter 221 of a camera module
Transmission region forms a light blocking region except the transmission region.
Preferably, in step (a), the ring-type light-shielding film 222 is set to the cutoff filter 221 and the mirror
The surface of first 20 opposite sides.
Preferably, it is further comprised the steps of: before step (a)
(b) the inside casing size for determining the light-shielding film 222 obtains so that straight by the light of the inside casing of the light-shielding film 222
Tap into the image sensor into the camera module；
(c) frame size for determining the light-shielding film 222 obtains so that at the upright projection of the outline border of the light-shielding film 222
Within the scope of the erecting bed 211 for installing the optical filter 22.
In step (b), determine the method for the inside casing size of the light-shielding film 222 the following steps are included:
(b1) according to the optical path situation of 20 internal optics of camera lens simulate to obtain each visual field chief ray, glazed thread with
And the angle of lower light；
(b2) radius of curvature of the last face lens of the camera lens 20 is obtained, the camera lens 20 arrives the optical filter 22
The refractive index and thickness of distance, the distance of the optical filter 22 to the image sensor 23 and the optical filter 22；
(b3) the simulation image height that each visual field chief ray, glazed thread and lower light are calculated according to above-mentioned parameter, in each visual field
Maximum analog image height as it is described windowing 2221 size.
Preferably, further include the steps that a correction 2221 sizes of the windowing after step (b3): (b4) is according to processing procedure
When assembling deviation, increase corresponding offset in the size of the windowing 2221 obtained in step (b3), corrected
The windowing 2221 size.
Preferably, in step (a), the light-shielding film 222 is coated to by the infrared cutoff using yellow light process technique
On optical filter 221, the photoresist in the yellow light process technique is black absorbing material.
Preferably, when coating the light-shielding film 222 using yellow light process technique, comprising the following steps: clean and dry institute
State cutoff filter 221；The linging on the cutoff filter 221；It is revolved on aforementioned cutoff filter 221
Resist coating；To the soft baking of aforementioned cutoff filter 221；Alignment exposure is carried out to aforementioned cutoff filter 221；To preceding
It states after cutoff filter 221 carries out and dries；Develop to aforementioned cutoff filter 221；Aforementioned infrared cutoff is filtered
Mating plate 221 is dried firmly；Aforementioned cutoff filter 221 is etched to form the optical filter 22.
Preferably, in step (a), the light-shielding film 222 is coated to by the IR cut filter using silk screen printing process
On piece 221, the ink in the silk screen printing process is black absorbing material.
Preferably, when coating the light-shielding film 222 using silk screen printing process, comprising the following steps: by screen printing forme by institute
Ink is stated coated on the cutoff filter 221；It toasts aforementioned cutoff filter 221 and obtains the optical filter 22.
It should be understood by those skilled in the art that foregoing description and the embodiment of the present invention shown in the drawings are only used as illustrating
And it is not intended to limit the present invention.The purpose of the present invention has been fully and effectively achieved.Function and structural principle of the invention exists
It shows and illustrates in embodiment, under without departing from the principle, embodiments of the present invention can have any deformation or modification.
Claims (21)
1. a kind of camera module, which is characterized in that including a camera lens, a bracket of the fixed camera lens is set under the camera lens
One optical filter of side, and the image sensor below the optical filter, wherein the optical filter includes one infrared section
Only optical filter and a light-shielding film, the light-shielding film are coated on the cutoff filter surface, tool among the light-shielding film
There is a windowing, is able to form a transmission region among the cutoff filter, forms one except the transmission region
Light blocking region, wherein the light-shielding film is annular, and the inside casing of the light-shielding film forms the windowing, and the light-shielding film is along institute
The edge for stating cutoff filter is set to the upper surface of the cutoff filter, wherein the inside casing ruler of the light-shielding film
It is very little to be calculated by following steps: each visual field chief ray, glazed thread and lower light are calculated according to each parameter of the camera module
The simulation image height of line, using the maximum analog image height in each visual field as the inside casing size of the light-shielding film, wherein the camera shooting mould
Each parameter of group include simulated to obtain according to the optical path situation of the camera lens internal optics each visual field chief ray, glazed thread with
And the angle of lower light, the radius of curvature of last face lens of the camera lens, the distance of the camera lens to the optical filter, institute
State optical filter to the image sensor distance, and, the refractive index and thickness of the optical filter.
2. camera module as described in claim 1, wherein the bracket extends inwardly an erecting bed, among the erecting bed
A window is formed, the optical filter is installed on the erecting bed, and the upright projection of the light-shielding film outline border is in the erecting bed
In range.
3. camera module as described in claim 1, wherein the light-shielding film is coated by yellow light process technique or silk screen printing process
In the cutoff filter, when using the yellow light process technique, the phase of the shape of the light shield used and the light-shielding film
When together, using the silk screen printing process, the shape of the saturating inked areas of the screen printing forme used is identical as the light-shielding film.
4. camera module as described in claim 1, wherein the light-shielding film with a thickness of 2 μm ~ 12 μm.
5. camera module as claimed in claim 3, wherein the light-shielding film with a thickness of 2 μm ~ 12 μm.
6. camera module as described in claim 1 can absorb 95% wherein the light-shielding film is a kind of black absorbing material
Above luminous energy, the light-transmissive less than 0.2%, the luminous energy less than 3.5% are reflected.
7. camera module as claimed in claim 5 can absorb 95% wherein the light-shielding film is a kind of black absorbing material
Above luminous energy, the light-transmissive less than 0.2%, the luminous energy less than 3.5% are reflected.
8. camera module as claimed in claim 1, wherein the camera module further comprises a wiring board, it is described
Wiring board is electrically connected with the image sensor by several gold threads.
9. a kind of optical filter, the optical filter is adapted to be mounted to a camera module, and the camera module includes being set to the optical filtering
A camera lens above piece, a bracket of the fixed camera lens, and the image sensor below the optical filter, it is special
Sign is that the optical filter includes a cutoff filter and a light-shielding film, and the light-shielding film is coated on described infrared section
Only optical filter surface, the light-shielding film centre have a windowing, are able to form a light transmission among the cutoff filter
Region forms a light blocking region except the transmission region, wherein the light-shielding film is annular, the inside casing of the light-shielding film
The windowing is formed, the light-shielding film is set to the upper of the cutoff filter along the edge of the cutoff filter
Surface, wherein the inside casing size of the light-shielding film is calculated by following steps: according to each parameter meter of the camera module
The simulation image height for calculating each visual field chief ray, glazed thread and lower light, using the maximum analog image height in each visual field as described light-blocking
The inside casing size of film, wherein each parameter of the camera module includes the optical path situation according to the camera lens internal optics
Simulation obtain the angle of each visual field chief ray, glazed thread and lower light, the camera lens last face lens radius of curvature,
The camera lens to the distance of the optical filter, the distance of the optical filter to the image sensor, and, the optical filter
Refractive index and thickness.
10. optical filter as claimed in claim 9, wherein the bracket of the camera module extends inwardly an erecting bed,
A window is formed among the erecting bed, the optical filter is installed on the erecting bed, the upright projection of the light-shielding film outline border
Within the scope of the erecting bed.
11. optical filter as claimed in claim 9, wherein the light-shielding film is coated on by yellow light process technique or silk screen printing process
The cutoff filter, when using the yellow light process technique, the shape of the light shield used is identical as the light-shielding film,
When using the silk screen printing process, the shape of the saturating inked areas of the screen printing forme used is identical as the light-shielding film.
12. optical filter as claimed in claim 9, wherein the light-shielding film with a thickness of 2 μm ~ 12 μm.
13. optical filter as claimed in claim 11, wherein the light-shielding film with a thickness of 2 μm ~ 12 μm.
14. the optical filter as described in any in claim 9-13, wherein the light-shielding film is a kind of black absorbing material, it can
95% or more luminous energy, the light-transmissive less than 0.2% are absorbed, the luminous energy less than 3.5% is reflected.
15. a kind of manufacturing method of the optical filter of camera module, which is characterized in that the method includes the steps: (a) coat one
Cyclic annular light-shielding film is able to form a light transmission among the cutoff filter in the cutoff filter of a camera module
Region forms a light blocking region except the transmission region, and wherein in step (a), the light-shielding film is set to described infrared
The surface of one camera lens opposite side of edge filter and the camera module, wherein before step (a) further include step
(b) and/or (c), wherein step (b) are as follows: the inside casing size for determining the light-shielding film obtains so that by the light-shielding film inside casing
Light is directly entered an image sensor of the camera module；Step (c) are as follows: the frame size for determining the light-shielding film obtains
So that the upright projection of the light-shielding film outline border is within the scope of the erecting bed for installing the optical filter, wherein in step
Suddenly the inside casing size of the light-shielding film is determined in (b) the following steps are included:
(b1) according to the optical path situation of the camera lens internal optics simulate to obtain each visual field chief ray, glazed thread and under
The angle of light；
(b2) radius of curvature of the last face lens of the camera lens, distance of the camera lens to the optical filter, described is obtained
Optical filter is to the distance of the image sensor and the refractive index and thickness of the optical filter；And
(b3) according to the curvature of the angle of each visual field chief ray, glazed thread and lower light, the last face lens of the camera lens
Radius, the distance of the camera lens to the optical filter, the distance of the optical filter to the image sensor, and, the filter
The refractive index and thickness of mating plate calculate the simulation image height of each visual field chief ray, glazed thread and lower light, with the maximum in each visual field
Simulate inside casing size of the image height as the light-shielding film.
16. method as claimed in claim 15, wherein further including the one of the correction light-shielding film opening after step (b3)
The step of window size: assembling deviation when (b4) is according to processing procedure increases in the size of the windowing obtained in step (b3)
Corresponding offset, the size of the windowing corrected.
17. the method as described in claim 15 or 16 is applied the light-shielding film using yellow light process technique in step (a)
It is overlying on the cutoff filter surface, specifically includes the following steps: cleaning and drying the cutoff filter；Preceding
State linging on cutoff filter；The spin coating photoresist on aforementioned cutoff filter；To aforementioned cutoff filter
Soft baking；Alignment exposure is carried out to aforementioned cutoff filter；It is dried after being carried out to aforementioned cutoff filter；To aforementioned infrared
Edge filter develops；Aforementioned cutoff filter is dried firmly；Aforementioned cutoff filter is etched
Form the optical filter.
18. method as claimed in claim 17 can absorb 95% or more wherein the photoresist is black absorbing material
Luminous energy, the light-transmissive less than 0.2%, the luminous energy less than 3.5% are reflected.
19. the light-shielding film is coated in step (a) using silk screen printing process by the method as described in claim 15 or 16
The cutoff filter surface, specifically includes the following steps: ink is coated on the infrared cutoff by screen printing forme
Optical filter；It toasts aforementioned cutoff filter and obtains the optical filter.
20. method as claimed in claim 19 can absorb 95% or more light wherein the ink is black absorbing material
Can, the light-transmissive less than 0.2%, the luminous energy less than 3.5% is reflected.
21. the method as described in claim 15 or 16, wherein the light-shielding film is a kind of black absorbing material, it is described light-blocking
The luminous energy of film absorbable 95% or more, the light-transmissive less than 0.2%, the luminous energy less than 3.5% are reflected.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510019726.4A CN105842961B (en) | 2015-01-15 | 2015-01-15 | A kind of optical filter, camera module and its manufacturing method |
| PCT/CN2016/070862 WO2016112856A1 (en) | 2015-01-15 | 2016-01-14 | Optical filter, camera module and manufacturing method thereof |
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| CN201510019726.4A CN105842961B (en) | 2015-01-15 | 2015-01-15 | A kind of optical filter, camera module and its manufacturing method |
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| CN105842961B true CN105842961B (en) | 2019-08-30 |
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| CN110646875A (en) * | 2019-09-26 | 2020-01-03 | 东莞市微科光电科技有限公司 | Optical filter manufacturing method |
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