CN109946777A - Optical filter, preparation method and the imaging device with it - Google Patents
Optical filter, preparation method and the imaging device with it Download PDFInfo
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- CN109946777A CN109946777A CN201711388221.0A CN201711388221A CN109946777A CN 109946777 A CN109946777 A CN 109946777A CN 201711388221 A CN201711388221 A CN 201711388221A CN 109946777 A CN109946777 A CN 109946777A
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Abstract
The present invention provides a kind of optical filter, preparation method and with its imaging device.The optical filter includes substrate layer and the optical adjustment layer for being set to substrate layer at least side, optical adjustment layer includes at least one set of low refractive index material layer and high refractive index material layer being stacked, since above-mentioned optical filter further includes the blue light absorption material being set in substrate layer, above-mentioned blue-light absorbers can absorb the blue light of specific band, it does not drift about with incident high angle scattered light on the left of curve to make optical filter, and then make above-mentioned optical filter under the incident light irradiation of different angle, curves shift is very small, it can satisfy requirement of the cell phone manufacturer to optical filter wide-angle drift value.
Description
Technical field
The present invention relates to optical technical field, in particular to a kind of optical filter, preparation method and with its at
As equipment.
Background technique
Optical filter is the optical device for choosing required optical region, is widely used in the imagings such as mobile phone, camera and sets
In standby, the landscape image shot under the action of optical filter can more protrude main scape.Such as want to start auction one with camera or mobile phone
Piece safflower, background are that blue sky, greenery if clapped according to usual cannot protrude " safflower " this theme, because of the image of safflower
It is not prominent enough.But if putting an optical filter before camera lens, the green light for stopping a part of greenery to scatter, blue sky are scattered
Blue light, and the feux rouges for allowing safflower to scatter largely passes through, in this way, safflower just seems fairly obvious, highlight " safflower " this
A theme.
The design and development of optical filter generally select substrate and film material according to performance requirement, with coating method in substrate
Two sides be alternatively formed multilayer with certain thickness high and low refractive index metal or metal oxide coating, to constitute one
Kind plural serial stage solid forme cloth founds-Perot interference, to realize the cut-off of specific band.
Usual people are when designing optical filter, usually primary concern is that passband center wavelengths, passband width and passband are saturating
Rate is crossed, and rejection zone depth can be reduced by improving passband transmitance generally, vice versa.It needs well-designed both saturating with upper passband
Crossing rate again has the optical filter of excellent cut-off depth.
In addition the optical filter that this method manufactures, which exists, ends the phenomenon that drifting about to large angle incidence light, and principle is light
A series of problems, such as will lead to the short shifting of passband, the reduction of passband transmitance, optical waveform drift when beam oblique incidence, it is specific as used this
Being imaged at mobile phone photograph for the optical filter of seed type is unstable, influences the in-service evaluation of consumer, brings to cell phone manufacturer very big
Puzzlement.Optical filter is thought after many experiments at present near 415nm, i.e., at half value transmitance (transmitance 50%)
Wide-angle drift value is ± 5nm, and being able to maintain mobile phone has effect of preferably taking pictures, however is extremely difficult to using traditional optical filter
This standard.
Summary of the invention
The main purpose of the present invention is to provide a kind of optical filter, preparation method and with its imaging device, with solution
Existing for the optical filter certainly in the prior art made from coating method, the optical transmittance curve of optical filter can be with incident light
The variation of incident angle and occur light cut-off drift the phenomenon that the problem of.
To achieve the goals above, according to an aspect of the invention, there is provided a kind of optical filter, including substrate layer and
It is set to the optical adjustment layer of substrate layer at least side, optical adjustment layer includes at least one set of low-index material being stacked
Layer and high refractive index material layer, optical filter further include the blue light absorption material being set in substrate layer.
Further, blue light absorption material is selected from methchlorenes dyes, azo-methchlorenes dyes, ketimide class dyestuff, ketone
Sub- amide-methchlorenes dyes, nitrodiphenylamine class dyestuff, aminoketone type dyes, anthraquinone dyes, quinolines dyestuff, triazines
Dyestuff, benzothiazoles dyestuff and Coumarins dyestuff are any one or more of.
Further, substrate layer is cyclic polyolefin layer or transparent polyimide layer.
Further, weight content of the blue light absorption material in substrate layer be 0.0001~5%, preferably 0.001~
2%.
Further, substrate layer with a thickness of 2~100 μm, preferably optical filter with a thickness of 30~250 μm.
Further, low refractive index material layer and high refractive index material layer are optical coating, are preferably formed as low-refraction
The material of material layer and high refractive index material layer is independently selected from any one of silica, aluminium oxide, titanium oxide and niobium oxide
Or it is a variety of.
Further, optical filter further includes the resin layer being set between substrate layer and optical adjustment layer.
According to another aspect of the present invention, a kind of imaging device, including optical filter are provided, optical filter is above-mentioned optical filtering
Piece.
According to another aspect of the present invention, a kind of preparation method of optical filter is additionally provided, comprising the following steps: S1, it will
Raw material including substrate layer material and blue light absorption material is stirred, and obtains coating fluid；Coating fluid is coated on substrate by S2
On, it dries and removes, obtain the substrate layer formed by coating fluid；S3 forms optical adjustment layer, light in at least side of substrate layer
Learning adjustment layer includes at least one set of low refractive index material layer and high refractive index material layer being stacked.
Further, between step S2 and step S3, preparation method further includes that the step of resin layer is formed on substrate layer
Suddenly.
Further, blue light absorption material is selected from methchlorenes dyes, azo-methchlorenes dyes, ketimide class dyestuff, ketone
Sub- amide-methchlorenes dyes, nitrodiphenylamine class dyestuff, aminoketone type dyes, anthraquinone dyes, quinolines dyestuff, triazines
Dyestuff, benzothiazoles dyestuff and Coumarins dyestuff are any one or more of.
Further, substrate layer material is cyclic polyolefin or transparent polyimides.
Further, weight content of the blue light absorption material in substrate layer be 0.0001~5%, preferably 0.001~
2%.
It applies the technical scheme of the present invention, provides and a kind of including substrate layer and be set to the light of substrate layer at least side
The optical filter of adjustment layer is learned, optical adjustment layer includes at least one set of low refractive index material layer and high-index material being stacked
Layer, since above-mentioned optical filter further includes the blue light absorption material being set in substrate layer, above-mentioned blue-light absorbers can absorb spy
The blue light of standing wave section to make not drift about with incident high angle scattered light on the left of the curve of optical filter, and then makes above-mentioned optical filter
Under the incident light irradiation of different angle, curves shift is very small, can satisfy cell phone manufacturer to optical filter wide-angle drift value
Requirement.
Other than objects, features and advantages described above, there are also other objects, features and advantages by the present invention.
Below with reference to figure, the present invention is described in further detail.
Detailed description of the invention
The Figure of description for constituting a part of the invention is used to provide further understanding of the present invention, and of the invention shows
Examples and descriptions thereof are used to explain the present invention for meaning property, does not constitute improper limitations of the present invention.In the accompanying drawings:
Fig. 1 shows a kind of the schematic diagram of the section structure of optical filter provided by embodiment of the present invention；
Fig. 2 shows a kind of signals of the cross-section structure of optical filter including resin layer provided by embodiment of the present invention
Figure；
Fig. 3 is transmitance-wavelength plot of the diffusion sheet under different incident light angles in the embodiment of the present invention 5
Figure；And
Fig. 4 is completely using transmission of the optical filter after the optical curve under different incident light angles made from coating method
Rate-wavelength plot figure.
Wherein, the above drawings include the following reference numerals:
10, substrate layer；20, optical adjustment layer；30, resin layer.
Specific embodiment
It should be noted that in the absence of conflict, the feature in embodiment and embodiment in the present invention can phase
Mutually combination.The present invention will be described in detail below with reference to the accompanying drawings and embodiments.
In order to enable those skilled in the art to better understand the solution of the present invention, below in conjunction in the embodiment of the present invention
Attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is only
The embodiment of a part of the invention, instead of all the embodiments.Based on the embodiments of the present invention, ordinary skill people
The model that the present invention protects all should belong in member's every other embodiment obtained without making creative work
It encloses.
It should be noted that description and claims of this specification and term " first " in above-mentioned attached drawing, "
Two " etc. be to be used to distinguish similar objects, without being used to describe a particular order or precedence order.It should be understood that using in this way
Data be interchangeable under appropriate circumstances, so as to the embodiment of the present invention described herein.In addition, term " includes " and " tool
Have " and their any deformation, it is intended that cover it is non-exclusive include, for example, containing a series of steps or units
Process, method, system, product or equipment those of are not necessarily limited to be clearly listed step or unit, but may include without clear
Other step or units listing to Chu or intrinsic for these process, methods, product or equipment.
As described in background technique, optical filter in the prior art exists to the cut-off drift of large angle incidence light
The problem of phenomenon.The present inventor studies regarding to the issue above, propose a kind of optical filter, including substrate layer 10 with
And it is set to the optical adjustment layer 20 of at least side of substrate layer 10, optical adjustment layer 20 includes at least one set of low folding being stacked
Rate material layer and high refractive index material layer are penetrated, optical filter further includes the blue light absorption material being set in substrate layer 10.
Due to further including being set to blue light absorption material in substrate layer in above-mentioned optical filter, above-mentioned blue-light absorbers can inhale
The blue light of specific band is received, to make not drift about with incident high angle scattered light on the left of the curve of optical filter, and then makes above-mentioned filter
For mating plate under the incident light irradiation of different angle, curves shift is very small, can satisfy cell phone manufacturer and floats to optical filter wide-angle
The requirement of shifting value.
In above-mentioned optical filter of the invention, the blue light absorption material being arranged in substrate layer 10 can absorb 380nm extremely
Any wave band light within the scope of 450nm plays fixed curve, prevents from ending curves shift caused by because of large angle incidence light
Phenomenon.The phenomenon that ending curves shift caused by order to be effectively prevented because of large angle incidence light, it is preferable that above-mentioned blue light absorption
Weight content of the material in substrate layer 10 is 0.0001~5%, more preferably 0.001~2%.Above-mentioned blue light absorption material
Effect is the light for absorbing blue wave band, fixes optical filter in the transmittance curve of blue wave band, no longer with incident light angle
Variation and drift about.
Due to needing that optical filter could be made through processes such as the coating of road later, plated films after obtained substrate layer 10, especially
Coating process therein needs the harsh environment of high temperature high vacuum (such as 20 DEG C, for 24 hours), to need blue light absorption material to be added
It is not decomposed under 120 DEG C or so of hot conditions, it is preferable that above-mentioned blue light absorption material is selected from methchlorenes dyes, azo-methine
Class dyestuff, ketimide class dyestuff, ketimide-methchlorenes dyes, nitrodiphenylamine class dyestuff, aminoketone type dyes, anthraquinone
Class dyestuff, quinolines dyestuff, Triazine dye, benzothiazoles dyestuff and Coumarins dyestuff are any one or more of.On
Stating blue light absorption material is not only traditional anti-blue light effect, but can play the left side of fixed curve, prevents wide-angle
The effect of the curves shift of irradiation.
It is further preferable that above-mentioned substrate layer 10 is cyclic polyolefin layer (COP) or clear polyimides layer (PI).It is above-mentioned
COP and PI material not only toughness and mechanical performance with higher, and either COP or PI material with above-mentioned preferred kind
The blue light absorption material of class has excellent compatibility, is not easy to be precipitated, to not influence subsequent coating process.
In above-mentioned optical filter of the invention, in order to guarantee that the substrate layer 10 for being provided with blue light absorption material can be effective
It can also ensure that the lightening of optical filter while the curves shift for preventing wide-angle from irradiating, it is preferable that the thickness of substrate layer 10
Be 2~100 μm, at this point, the overall thickness of optical filtering flake products is 30~250 μm, and the thickness of commercially available optical filter be usually 30~
1100 μm, i.e., there is the optical filter of blue light absorption material in the present invention and there is no the influences to thickness.
In above-mentioned optical filter of the invention, optical adjustment layer 20 includes at least one set of low-index material being stacked
Layer and high refractive index material layer, can pass through the folding of refractive index and high refractive index material layer to above-mentioned low refractive index material layer
It penetrates rate and carries out Rational choice, so that the optical film that optical adjustment layer 20 is formed can be realized optical filter to required wavelength light
Transmission, those skilled in the art can be according to required refractive index to the material for forming low refractive index material layer and high refractive index material layer
Material carries out Rational choice.In order to transmission band more effectively be adjusted to required wave band, it is preferable that optical adjustment layer 20 includes
The low refractive index material layer and high refractive index material layer of the alternately laminated setting of multiple groups.
In a preferred embodiment, above-mentioned low refractive index material layer and above-mentioned high refractive index material layer are optics
Coating, it can above-mentioned low refractive index material layer and high refractive index layer are formed by the conventional coating process such as sputtering, evaporating, due to
Conventional coating process needs the harsh environment of high temperature high vacuum (such as 20 DEG C, for 24 hours), and is set in substrate layer 10 in the present invention
Blue light absorption material due to that can not be decomposed under 120 DEG C or so of hot conditions, to ensure that optical filter prevents big angle
Spend the effect of the curves shift of irradiation.Preferably, the material of above-mentioned low refractive index material layer and above-mentioned high refractive index material layer is formed
Expect any one or more of independently selected from silica, aluminium oxide, titanium oxide and niobium oxide.
In above-mentioned optical filter of the invention, optical filter further includes being set between substrate layer 10 and optical adjustment layer 20
Resin layer 30.Above-mentioned resin layer 30 can not only improve the mechanical performance of optical filter, additionally it is possible to effectively improve the scratch resistance of optical filter
Property.Preferably, the material for forming above-mentioned resin layer 30 includes acrylic resin and/or methyl iso-butyl ketone (MIBK).
According to another aspect of the present invention, a kind of imaging device, including optical filter are provided, and the optical filter is above-mentioned
Optical filter.Due to including being set to blue light absorption material in substrate layer in above-mentioned optical filter, above-mentioned blue-light absorbers can absorb
The blue light of specific band to make not drift about with incident high angle scattered light on the left of the curve of optical filter, and then makes above-mentioned optical filtering
For piece under the incident light irradiation of different angle, curves shift is very small, can satisfy cell phone manufacturer and drifts about to optical filter wide-angle
The requirement of value.
According to another aspect of the present invention, a kind of preparation method of optical filter is additionally provided, comprising the following steps: S1, it will
Raw material including substrate layer material and blue light absorption material is stirred, and obtains coating fluid；Coating fluid is coated on substrate by S2
On, it dries and removes, obtain the substrate layer 10 formed by coating fluid；S3 forms pH effect in at least side of substrate layer 10
Layer 20, optical adjustment layer 20 include at least one set of low refractive index material layer and high refractive index material layer being stacked, and are prepared into
The structure of the optical filter arrived is as shown in Figure 1.
In a preferred embodiment, between above-mentioned steps S2 and above-mentioned steps S3, above-mentioned preparation of the invention
Method further includes the steps that formation resin layer 30, the structure for the optical filter being prepared are as shown in Figure 2 on substrate layer.
In above-mentioned preparation method of the invention, substrate layer material, solvent and blue light absorption material can be stirred together
Coating fluid is obtained, substrate layer material and stirring solvent first can also be obtained into mixing liquid, then blue light absorption material is added and is mixed
It closes stirring to dissolution in liquid and obtains coating fluid, coating fluid coating obtains wet film on the glass substrate, and coating fluid wet-film thickness is 5
It~250 μm, dries again later, the coating liquid layer of drying is removed, as coating liquid layer is formed by substrate layer 10.Using such
Mode, blue light absorption material can be more preferable with the compatibility of substrate layer material, and blue light absorption material is not precipitated, and does not influence plated film.
Blue light absorption material is set to substrate layer 10, thus make not drift about with incident high angle scattered light on the left of the curve of optical filter, into
And make above-mentioned optical filter different angle incident light irradiation under, curves shift is very small, can satisfy cell phone manufacturer to optical filtering
The requirement of piece wide-angle drift value.
Above-mentioned blue light absorption material can absorb any wave band light within the scope of 380nm to 450nm, play fixed song
Line prevents the phenomenon that ending curves shift caused by because of large angle incidence light.In order to be effectively prevented because of large angle incidence light guide
The phenomenon that cut-off curves shift of cause, it is preferable that weight content of the above-mentioned blue light absorption material in substrate layer 10 is 0.0001
~5%, more preferably 0.001~2%.The effect of above-mentioned blue light absorption material is the light for absorbing blue wave band, makes optical filter
It fixes in the transmittance curve of blue wave band, no longer drifts about with the variation of incident light angle.
Due to needing (i.e. to form optics tune in step S2 through processes such as the coating of road later, plated films after obtained substrate layer 10
The step of functional layers such as flood 20) optical filter could be made, coating process especially therein needs high temperature high vacuum (such as 20
DEG C, for 24 hours) harsh environment, it is excellent so that blue light absorption material to be added be needed not decompose under 120 DEG C or so of hot conditions
Selection of land, above-mentioned blue light absorption material are selected from methchlorenes dyes, azo-methchlorenes dyes, ketimide class dyestuff, ketimide-
Methchlorenes dyes, nitrodiphenylamine class dyestuff, aminoketone type dyes, anthraquinone dyes, quinolines dyestuff, Triazine dye, benzene
And thiazoles dyestuff and Coumarins dyestuff are any one or more of.Above-mentioned blue light absorption material is not only traditional anti-indigo plant
Light action, but the left side of fixed curve can be played the role of, the curves shift for preventing wide-angle from irradiating.
Preferably, substrate layer material is cyclic polyolefin (COP) or clear polyimides (PI).Above-mentioned COP and PI material
Not only toughness and mechanical performance with higher, and either COP or PI material is inhaled with above-mentioned preferred class of blue light
Receiving material has excellent compatibility, is not easy to be precipitated, to not influence subsequent coating process.
In the preparation of optical filter, pass through at least a side surface sequential aggradation low-index material and the height in substrate layer 10
Refraction materials, to form at least one set of low refractive index material layer and high refractive index material layer being stacked, to be set
It is placed in the optical adjustment layer 20 of at least side of substrate layer 10.Above-mentioned depositing operation can be the conventional coating process such as sputtering, evaporation.
Preferably, the material of above-mentioned low refractive index material layer and above-mentioned high refractive index material layer is formed independently selected from silica, oxidation
Aluminium, titanium oxide and niobium oxide are any one or more of.
Optical filter provided by the invention and preparation method thereof is further illustrated below in conjunction with embodiment.
Embodiment 1
Optical filter provided in this embodiment includes substrate layer and the optical adjustment layer for being set to substrate layer side, optics tune
Flood includes one group of low refractive index material layer and high refractive index material layer being stacked, and optical filter further includes being set to substrate layer
Middle blue light absorption material.
The preparation method of above-mentioned optical filter includes: by 100g clear polyimides (APS company, C-1 type) and 1000g
MIBK is added together to be uniformly mixed, and stirring is to clear colorless liquid, by weight content is clear polyimides weight 0.9%
Blue-light absorbers (Qingdao Jie get Jia, BL1226) are added in above-mentioned colourless liquid, stir 1h to blue light absorption and after being completely dissolved
PI coating fluid is obtained, which is coated on glass for coating fluid using Slow die coating process after standing or vacuum defoamation
On glass substrate, it is then placed in baking oven drying, the coating liquid layer of drying is removed, obtains being formed by substrate layer by coating liquid layer,
The substrate layer containing blue light absorption material with a thickness of 18 μm is obtained, the blue-light absorbers in the substrate layer can absorb specific band
Blue light curve, fix light transmittance curve in the wave band；On the surface of substrate layer, sequence plates high-refraction material and low refraction material
Material is to form optical adjustment layer, and above-mentioned low refractive material is silica, and above-mentioned high-refraction material is titanium oxide.
Embodiment 2
Optical filter provided in this embodiment includes substrate layer and the optical adjustment layer for being set to substrate layer side, optics tune
Flood includes two groups of low refractive index material layers and high refractive index material layer being stacked, and optical filter further includes being set to substrate layer
Middle blue light absorption material.
The preparation method of above-mentioned optical filter includes: that 100g COP particle (JSR company) is added together with 500g cyclopentanone
It is uniformly mixed, stirring is to clear colorless liquid, and by blue-light absorbers that weight content is COP particle weight 1.1%, (Qingdao is outstanding
It is good, BL1205) it is added in above-mentioned colourless liquid, stirring 1h obtains COP coating fluid to blue light absorption and after being completely dissolved, the COP
Coating fluid uses small flat accurate spreader (the contactless painting that the small flat accurate production of Japan is made after standing or vacuum defoamation
Cloth) it is coated on the glass substrate, it is then placed in baking oven drying, the coating liquid layer of drying is removed, is obtained by coating liquid layer institute shape
At substrate layer, be made with a thickness of 30 μm of the substrate layer containing blue light absorption material, the blue-light absorbers in the substrate layer can
The blue light curve for absorbing specific band, fixes light transmittance curve in the wave band；On the surface of substrate layer, sequence plates high refraction material
Material and low refractive material are to form optical adjustment layer, and above-mentioned low refractive material is silica, and above-mentioned high-refraction material is titanium oxide.
Embodiment 3
Optical filter provided in this embodiment includes substrate layer and the optical adjustment layer for being set to substrate layer side, optics tune
Flood includes two groups of low refractive index material layers and high refractive index material layer being stacked, and optical filter further includes being set to substrate layer
Middle blue light absorption material.
The preparation method of above-mentioned optical filter includes: that 100g COP particle (JSR company) is added together with 500g cyclopentanone
It is uniformly mixed, stirring is to clear colorless liquid, and by blue-light absorbers that weight content is COP particle weight 1.3%, (Qingdao is outstanding
It is good, BL1205) it is added in above-mentioned colourless liquid, stirring 1h obtains COP coating fluid to blue light absorption and after being completely dissolved, the COP
Coating fluid uses small flat accurate spreader (the contactless painting that the small flat accurate production of Japan is made after standing or vacuum defoamation
Cloth) it is coated on the glass substrate, it is then placed in baking oven drying, the coating liquid layer of drying is removed, is obtained by coating liquid layer institute shape
At substrate layer, be made with a thickness of 25 μm of the substrate layer containing blue light absorption material, the blue-light absorbers in the substrate layer can
The blue light curve for absorbing specific band, fixes light transmittance curve in the wave band；On the surface of substrate layer, sequence plates high refraction material
Material and low refractive material are to form optical adjustment layer, and above-mentioned low refractive material is silica, and above-mentioned high-refraction material is titanium oxide.
Embodiment 4
Optical filter provided in this embodiment includes substrate layer and the optical adjustment layer for being set to substrate layer side, optics tune
Flood includes at least one set of low refractive index material layer and high refractive index material layer being stacked, and optical filter further includes being set to base
Blue light absorption material in material layer.
The preparation method of above-mentioned optical filter includes: that 100g COP particle (JSR company) is added together with 500g cyclopentanone
Be uniformly mixed, stirring to clear colorless liquid, by blue-light absorbers that weight content is COP particle weight 1.1% (BASF, 970
Type) it is added in above-mentioned colourless liquid, stirring 1h obtains COP coating fluid to blue light absorption and after being completely dissolved, COP coating fluid warp
It is coated with after standing or vacuum defoamation using small flat accurate spreader (contact-free applicator) made by the small flat accurate production of Japan
On the glass substrate, it is then placed in baking oven drying, the coating liquid layer of drying is removed, obtains being formed by substrate by coating liquid layer
Layer, is made the substrate layer containing blue light absorption material with a thickness of 30 μm, and the blue-light absorbers in the substrate layer can absorb specific
The blue light curve of wave band, fixes light transmittance curve in the wave band；On the surface of substrate layer, sequence plates high-refraction material and low folding
Material is penetrated to form optical adjustment layer, above-mentioned low refractive material is silica, and above-mentioned high-refraction material is titanium oxide.
Embodiment 5
Optical filter provided in this embodiment includes substrate layer, is set to the resin layer of substrate layer two sides, and is set to tree
Optical adjustment layer of the rouge layer far from substrate layer two sides, optical adjustment layer include three groups of low refractive index material layers being stacked and height
Refractive index material, optical filter further include being set to blue light absorption material in substrate layer.
The preparation method of above-mentioned optical filter includes: to add the transparent PI particle of 100g (APS company, the U.S.) with 1000g MIBK
To being mixed together uniformly, stirring to clear colorless liquid, by 1.1% blue-light absorbers that weight content is PI weight (BASF,
970 types) it is added in above-mentioned colourless liquid, stirring 1h obtains PI coating fluid to blue light absorption and after being completely dissolved, the PI coating fluid
Coating fluid is coated on the glass substrate using Slow die coating process after standing or vacuum defoamation, is then placed in baking oven baking
It is dry, the coating liquid layer of drying is removed, obtains being formed by substrate layer by coating liquid layer, is made and to contain blue light with a thickness of 2 μm
The substrate layer of absorbing material, the blue-light absorbers in the substrate layer can absorb the blue light curve of specific band, make light transmittance curve
It is fixed in the wave band；Resin layer is formed on the surface of substrate layer, the mechanical performance and scratch resistance of optical filter can be improved in resin layer；
In two sides of the resin layer far from substrate layer, sequentially plating high-refraction material and low refractive material are above-mentioned to form optical adjustment layer later
Low refractive material is silica, and above-mentioned high-refraction material is titanium oxide.
Above-mentioned obtained optical substrate, using lambda1050 type spectrophotometer, test sample is in 0 °, 30 ° of item respectively
Transmitance-wavelength plot under part, especially made from the embodiment 5 for substrate sample, test results are shown in figure 3,
Under the incident light irradiation of incidence angles degree, the optical transmittance curve measured is consistent substantially, and uses plated film completely
Optical filter made from method is under different incident light angles, and the optical curve measured with spectrophotometric is as shown in figure 4, can be with from figure
Find out that there are bigger differences for two curves.
It can be seen from the above description that the above embodiments of the present invention realized the following chievements: due to filtering
Piece includes being set to blue light absorption material in substrate layer, and above-mentioned blue-light absorbers can absorb the blue light of specific band, to make
It does not drift about with incident high angle scattered light on the left of the curve of optical filter, and then shines above-mentioned optical filter in the incident light of different angle
It penetrates down, curves shift is very small, can satisfy requirement of the cell phone manufacturer to optical filter wide-angle drift value.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field
For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, made any to repair
Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (13)
1. a kind of optical filter, which is characterized in that including substrate layer (10) and be set to the substrate layer (10) at least side
Optical adjustment layer (20), the optical adjustment layer (20) include at least one set of low refractive index material layer being stacked and high refraction
Rate material layer, the optical filter further include the blue light absorption material being set in the substrate layer (10).
2. optical filter according to claim 1, which is characterized in that the blue light absorption material is selected from methchlorenes dyes, idol
Nitrogen-methchlorenes dyes, ketimide class dyestuff, ketimide-methchlorenes dyes, nitrodiphenylamine class dyestuff, aminoketones dye
Any one of material, anthraquinone dyes, quinolines dyestuff, Triazine dye, benzothiazoles dyestuff and Coumarins dyestuff or
It is a variety of.
3. optical filter according to claim 2, which is characterized in that the substrate layer (10) is cyclic polyolefin layer or transparent
Polyimide layer.
4. optical filter according to claim 1, which is characterized in that the blue light absorption material is in the substrate layer (10)
Weight content be 0.0001~5%, preferably 0.001~2%.
5. optical filter according to claim 1, which is characterized in that the substrate layer (10) with a thickness of 2~100 μm, it is excellent
Select the optical filter with a thickness of 30~250 μm.
6. optical filter according to claim 1, which is characterized in that the low refractive index material layer and the high refractive index material
The bed of material is optical coating, and the material for being preferably formed as the low refractive index material layer and the high refractive index material layer independently selects
Autoxidation silicon, aluminium oxide, titanium oxide and niobium oxide are any one or more of.
7. optical filter according to claim 1, which is characterized in that the optical filter further includes being set to the substrate layer
(10) resin layer (30) between the optical adjustment layer (20).
8. a kind of imaging device, including optical filter, which is characterized in that the optical filter is described in any one of claims 1 to 7
Optical filter.
9. a kind of preparation method of optical filter, which comprises the following steps:
Raw material including substrate layer material and blue light absorption material is stirred, obtains coating fluid by S1；
The coating fluid is coated on substrate by S2, is dried and is removed, and the substrate layer (10) formed by the coating fluid is obtained；
S3 forms optical adjustment layer (20) in at least side of the substrate layer (10), and the optical adjustment layer (20) includes extremely
Few one group of low refractive index material layer and high refractive index material layer being stacked.
10. preparation method according to claim 9, which is characterized in that between the step S2 and the step S3, institute
Preparation method is stated to further include the steps that forming resin layer (30) on the substrate layer (10).
11. preparation method according to claim 9, which is characterized in that the blue light absorption material be selected from methchlorenes dyes,
Azo-methchlorenes dyes, ketimide class dyestuff, ketimide-methchlorenes dyes, nitrodiphenylamine class dyestuff, aminoketones
Any one of dyestuff, anthraquinone dyes, quinolines dyestuff, Triazine dye, benzothiazoles dyestuff and Coumarins dyestuff
Or it is a variety of.
12. preparation method according to claim 10, which is characterized in that the substrate layer material is for cyclic polyolefin or thoroughly
Bright polyimides.
13. preparation method according to claim 9, which is characterized in that the blue light absorption material is in the substrate layer
(10) weight content in is 0.0001~5%, preferably 0.001~2%.
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