CN106959479A - A kind of optical film - Google Patents

A kind of optical film Download PDF

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Publication number
CN106959479A
CN106959479A CN201710193830.4A CN201710193830A CN106959479A CN 106959479 A CN106959479 A CN 106959479A CN 201710193830 A CN201710193830 A CN 201710193830A CN 106959479 A CN106959479 A CN 106959479A
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CN
China
Prior art keywords
interlayer
optical film
basic unit
coating
optical
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Granted
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CN201710193830.4A
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CN106959479B (en
Inventor
薛九枝
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Suzhou Zhengdao Optoelectronic Materials Co ltd
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Jiangsu Jitri Smart Liquid Crystal Sci and Tech Co Ltd
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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
    • G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
    • G02B1/04—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of organic materials, e.g. plastics
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/02—Diffusing elements; Afocal elements
    • G02B5/0205—Diffusing elements; Afocal elements characterised by the diffusing properties
    • G02B5/021—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/02—Diffusing elements; Afocal elements
    • G02B5/0273—Diffusing elements; Afocal elements characterized by the use
    • G02B5/0278—Diffusing elements; Afocal elements characterized by the use used in transmission

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Laminated Bodies (AREA)
  • Optical Elements Other Than Lenses (AREA)

Abstract

A kind of optical film.Optical film includes basic unit, interlayer and coating：Basic unit has flat basic unit's lower surface and the basic unit upper surface relative with basic unit lower surface, and basic unit upper surface is uneven patterned surface, and basic unit has first refractive index；Interlayer has interlayer lower surface and the interlayer upper surface relative with interlayer lower surface, and interlayer lower surface is arranged on basic unit upper surface, and interlayer has the second refractive index and conforms to the uneven patterned surface of basic unit upper surface；Coating has coating lower surface and the coating upper surface relative with coating lower surface, and coating lower surface is arranged on interlayer upper surface, and coating upper surface is the flat surface parallel with basic unit lower surface, and coating has third reflect rate；First is about identical with third reflect rate, and the second refractive index is substantially greater than first and third reflect rate, and the change of thickness of interlayer is compared with average thickness in the range of ± 50%.The present invention greatly simplifies preparation technology requirement and can realize inexpensive production.

Description

A kind of optical film
Technical field
This invention relates generally to a kind of optical film, more particularly it relates to such optical film, the optical film Irreflexive while through the insignificant image of distortion to incident light progress.
The optical film can be widely used as the fenestrated membrane of building, wherein " frosted glass " outward appearance of the film will be building Certain privacy is provided in thing room.The film can also reduce the mirror-reflection of windowpane when as fenestrated membrane.The optics Film is also used as image combiner, it is allowed to which beholder observes the image for passing through film and forms the image on film simultaneously.This hair It is bright further to a kind of optical film for being used as partition wall, for providing differentiated vision to the object of the partition wall both sides Effect.
Background technology
Optically transparent film has a wide range of applications, such as the optics in the windowpane and display of building Layer.Specifically, the use of windowpane be not only for collect natural light purpose, and it is also attractive in appearance the reason for.Clearly Optical film materials (such as glass) can also be used in the inside of building as the partition wall for separating two rooms, and by with In exterior wall glass window outwardly and inwardly is separated.For the vehicles of such as automobile or aircraft, transparent glass flake can To be used as windshield, wherein the clear of environment where having the vehicles for the operator of the vehicles is regarded Open country is very crucial.Generally, inciding the light of such optical transparent film has sub-fraction to be specularly reflected.Namely Say, for each direction of incident light, basically there exist a corresponding reflection light direction.
However, often may require that the light of transparent membrane reflection can not be mirror-reflection.In particular it is desired that optical clear Film is minimum to while ignoring in the distortion through image, and reflected light can be diffusion.For building material The application of aspect, whether used as outer glass window, is also used as inner partition wall, clear glass or optical film is highly desirable to sometimes While the clear visual field is provided privacy is provided for user.For example, during interrogation in the nick, investigator wish from every One side room of wall can clearly observe suspect, and the suspect in the another side room of partition wall only sees Bai Qiang.And it is right In residential building, it is desirable to which, when watching internal from outside under normal lighting conditions, details can be shielded or fuzzy, The user in building possesses the clearly outside visual field simultaneously.For the application of the vehicles, it is desirable to which windshield can also It is used as looking squarely projection display screen, the key message so on condition of road surface, the information on the vehicles and any Order or other key messages can be shown on the windshield in the case where not weakening the clear visual field of driver.
Application in terms of building material at present, privacy can be by using full window shade or the wide portion of permission Divide by but the fuzzy lace in the visual field or tulle curtain are provided.Privacy can also come real by using modern technologies It is existing, the modern technologies such as PDLC light modulation film, suspended particle device and electrochromic intelligent windowpane.So And, nowadays all current materials and technology all have the following problems, i.e. although there is provided certain privacy, simultaneously Equivalent stop or the outside visual field for having obscured user in building.In addition, the specular light of glass of building window is easy Danger is caused to outside driver.(behaviour of the vehicles wherein, is utilized for the head-up display used in automobile and aircraft It is necessary to expand the external environment condition visual field as information), implementation method generally comprises the wavelength selectivity using very narrow-band Plated film strengthens the reflection of selected wavelength.Wherein for automobile, implementation method is also including the use of holographic diffuser film, and hair recently The flush type numerical aperture expander that exhibition is got up, in flush type numerical aperture expander method, reflected image is by windshield In insertion sightless microlens array amplification.However, the realization of these solutions is expensive.
Accordingly, it is desirable to provide a kind of optical film, the optical film reflected light set in advance is carried out it is irreflexive simultaneously, The basic zero deflection of transmitted light can be achieved, such user can substantially observe the thing of the opposite side of optical film without distortions Body.Simultaneously it remains desirable that the production technology of the optical film is greatly simplified, a large amount of productions at low cost can be achieved.
The content of the invention
To meet the demand, the present invention proposes a kind of optical film of particular design, in the optical film, upper and lower surface Substantially conformal, thickness change can have larger tolerance (for example, compared to average thickness in the range of ± 50%) each other Optical material thin layer is sandwiched between two optical material layers with substantially the same refractive index, the optical material clipped Refractive index be different from the refractive index of covering layer material and base material, and the layer clipped is not flat.By so Optic film structure incident light when leaving optical film no matter incident angle how can be to not substantially change former propagation Direction, as long as and interlayer thickness it is sufficiently thin, the lateral displacement of emergent ray is insignificant.Therefore in optical film side Object can be entirely clear for the beholder in the opposite side of film.On the other hand, because interlayer is non-flat forms, sentence is changed Talk about, interlayer and the interface of coating and basic unit are such as wavy textures (being still, substantially conformal), so, take The position on interface is certainly incident in light, reflected light can be different directions caused by being mismatched due to the refractive index at interface. That is, reflected light is diffusion.
Below by way of illustrating and combining system, tool and method, embodiment of the present invention and its purpose are described And explanation.These illustrations are only exemplary and illustrative and nonrestrictive.In various embodiments, said one Or more market demand be met by the present invention, and other embodiments are then improved for other.
The main object of the present invention is to provide a kind of transparent optical film, and the optical film is diffusing or obscured reflection It is that transparent and through image distortion is insignificant while object.
It is a further object to provide a kind of transparent optical film, the optical film is in reflected light in a direction model Place distribution and be that transparent and through image distortion is insignificant while around predetermined reflection direction.
The exemplary of such transparent diffusing reflection optical thin film can be produced it is a further object to provide a kind of Manufacturing process.
Another main purpose of the present invention is to provide a kind of transparent diffusing reflection optical film based on plastic sheeting, and the film is Easily mass produce.
The transparent diffusing reflection optics of clear substrate can easily be attached to it is a further object to provide a kind of Film.
It is a further object to provide the windscreen construction for the vehicles, the windscreen construction allows Operator and user can show projection real image on the windshield, while the surrounding's ring that can be watched by windshield Border.
The present invention further objective is that provide a kind of windowpane or glass partition, the windowpane or glass partition can be with Allow user in building that there is outside or the substantially undistorted visual field of partition wall opposite side, while the viewing in opposite side Person is only capable of seeing fuzzy or dim wall or surface.
One aspect of the present invention provides a kind of optical film, and the optical film includes：Basic unit, the basic unit has flat Basic unit's lower surface and the basic unit upper surface relative with basic unit's lower surface, the basic unit upper surface are uneven structuring tables Face, and the basic unit has first refractive index n1, interlayer, the interlayer have interlayer lower surface and with the interlayer lower surface Relative interlayer upper surface, the interlayer lower surface is arranged on the basic unit upper surface, and the interlayer has the second refractive index n2, and the interlayer substantially conforms to the uneven patterned surface of the basic unit upper surface, and coating, The coating has under coating lower surface and the coating upper surface relative with the coating lower surface, the coating Surface is arranged on the interlayer upper surface, and the coating upper surface is and substantially parallel flat of basic unit's lower surface Surface, and the coating has third reflect rate n3, wherein, the first refractive index n1With third reflect rate n3Substantially Upper identical, the second refractive index n2Substantially greater than described first refractive index n1With the third reflect rate n3, and the folder The change of the thickness d of layer and average thicknessCompared in the range of ± 50%.
In preferred embodiments, the change of the thickness d of the interlayer and average thicknessCompared to can be ± 20% In the range of.In further preferred embodiment, the change of the thickness d of the interlayer and average thicknessCompared to can ± In the range of 10%.
In preferred embodiments, the uneven patterned surface can be wavy texture surface.
In preferred embodiments, the characteristic length L between the adjacent peaks of the interlayer or adjacent trough1Can be little In 2mm.In further preferred embodiment, the characteristic length L between the adjacent peaks of the interlayer or adjacent trough1Can be with No more than 0.5mm.In still more preferably embodiment, the feature between the adjacent peaks of the interlayer or adjacent trough is long Spend L10.1mm can be not more than.
In preferred embodiments, the adjacent peaks or adjacent trough of the change curve of the thickness d of the interlayer it Between characteristic length L22mm can be not more than.In further preferred embodiment, the change of the thickness d of the interlayer Characteristic length L between the adjacent peaks of curve or adjacent trough20.5mm can be not more than.In still more preferably embodiment party In case, the characteristic length L between the adjacent peaks or adjacent trough of the change curve of the thickness d of the interlayer2Can not More than 0.1mm.
In preferred embodiments, the difference in height between the crest and trough of the interlayer can be not more than 200 μm.Entering In one step preferred embodiment, the difference in height between the crest and trough of the interlayer can be not more than 100 μm.Further In preferred embodiment, the difference in height between the crest and trough of the interlayer can be not more than 50 μm.
In preferred embodiments, the average thickness of the interlayer1 μm can be not more than.Further preferred real Apply in scheme, the average thickness of the interlayer0.5 μm can be not more than.In still more preferably embodiment, institute State the average thickness of interlayer0.1 μm can be not more than.
In preferred embodiments, the interlayer can two layers or more layer mutually substantially conformal sublayer is constituted Sandwich construction.Also, it is many that the interlayer can also be that the mutually substantially conformal sublayer of two or more materials is constituted Rotating fields.
In preferred embodiments, the basic unit can be composite construction, and the composite construction can include substantially thick Spend uniform substrate, and adhesion over the substrate and upper surface be the wavy texture surface top layer.It is described The material of substrate can be clear glass, or deformable flexible plastic film material such as PET material.The top layer can be logical Cross light or thermal polymerization, solidification Optical transparent adhesive material layer.
In preferred embodiments, the basic unit can by PET substrate with polymerize after Optical transparent adhesive skin-material structure Into, the coating can by polymerizeing after optical clear glue material constitute, and the interlayer can be by TiO2Material is constituted. In interchangeable embodiment, the basic unit can be made up of PET substrate with the Optical transparent adhesive skin-material after polymerizeing, institute State coating can by polymerizeing after optical clear glue material constituted with PET film material, and above and below the interlayer can be clipped in Between Optical transparent adhesive material layer after two layers of polymer and by TiO2Material is constituted.
In preferred embodiments, the third reflect rate n3About 1.51, the sandwich material is TiO2, and institute The average thickness d for stating interlayer can be about 55nm.In preferred embodiments, the interlayer can include metal level, described Metal level can be aluminium lamination or silver layer.The thickness of the metal level can be about 10nm to about 50nm.
Other objects and advantages will be significant according to the following description of this invention.
Brief description of the drawings
Exemplary is illustrated in accompanying drawing is with reference to figure.It is intended that embodiment disclosed herein It is considered as illustrative and not restrictive with accompanying drawing.
Fig. 1 is that the core texture and its operating principle of transparent diffusing reflection optical film schematically illustrate figure.
Fig. 2 is that the transparent diffusing reflection optical film that can be applied to glass substrate schematically illustrates figure.
Fig. 3 is the schematic of the transparent diffusing reflection optical film of reflection direction centered on diffusing at a predetermined angle wherein Illustrate figure.
Fig. 4 is that generation schematically illustrates figure as the technique of the basic unit of a part for transparent diffusing reflection optical film.
Fig. 5 is that generation schematically illustrates figure as the alternative techniques of the basic unit of a part for transparent diffusing reflection optical film.
Fig. 6 be generated since the basic unit with desired surface texture transparent diffusing reflection optical film technique it is schematic Illustrate figure.
Fig. 7 is the structural representation of the optical film according to one embodiment of this invention.
Fig. 8 is the schematic diagram of thickness of interlayer change curve.
Fig. 9 be transparent diffusing reflection optical film in windowpane or partition wall application how for optical film opposite side user There is provided asymmetric visual effect schematically illustrates figure.
Figure 10 is schematically illustrating of how being used in the projection display system of transparent diffusing reflection optical film in the car Figure.
Embodiment
In the following description, illustrated to reach purpose of explanation with there is a comprehensively understanding to the present invention Substantial amounts of detail, however, it will be apparent that to those skilled in the art, without these details can also be real The existing present invention.In other examples, known construction and device is shown in square frame chart.In this respect, that is lifted is illustrative Example embodiment only for explanation, not to the present invention cause limitation.Therefore, protection scope of the present invention is not by above-mentioned Specific embodiment is limited, and only the scope by appending claims is defined.
As used herein, " one " (" a " or " an ") means one or more.
As used herein, " μm " means micron, and length is the 1/1000000 of one meter.
As used herein, " nm " means nanometer, and length is the 1/1000000000 of one meter.
As used herein, " optical film " and " optical layer " means generally to transmit most of light incided on film The optical material thin slice of line.
As used herein, " light " means the electromagnetic radiation in visible or infra-red range.
As used herein, " thin slice ", " sheeting " and " film " can be used interchangeably and refer to same class Very thin object, is particularly very thin optical material.
Embodiment disclosed herein is related to a kind of optical film being made up of multilayer optical material, wherein being transmitted through The light of the film is propagated substantially in the direction substantially the same direction incided with it on film, and with insignificant horizontal stroke To displacement；Meanwhile, the position on optical film surface is incided depending on particular light ray, relative to the identical incident direction of embrane method line Reflected light different directions can be presented.Specifically, in a preferred embodiment herein disclosed, multilayer optical Film is made up of optically transparent basic unit, interlayer and coating.Basic unit has flat lower surface, and basic unit relatively on Surface is structuring, namely the uneven surface with the figuratrix roughness preferably in 100 micrometer ranges, and It is the patterned surface can with predetermined shape and pattern.The interlayer of the preferred embodiment of multilayer film, which has, is different from basic unit Refractive index, and be deposited over the structured side of basic unit, comply with the uneven surface structure of basic unit and with generally small In one micron of thickness.Coating is that have the optical material substantially with the refractive index identical refractive index of basic unit, and by It is deposited on interlayer, complies with surface texture, and its surface away from interlayer is substantially optically smooth.Such optical film Object positioned at the opposite side of film is clearly shown, while light of the diffusing reflection from beholder side.Such film It is used as being attached to the projection screen on the windshield of the vehicles, the windshield causes vehicle operator Can be with the clearly environment visual field, while can be observed to project to the image on windshield.Such film can also by with Make the privacy screen of windowpane, the wherein user in building is by with the outside clear visual field, and outside building People at most can only see the blurred picture of interior of building object under generally brighter external condition.
As shown in fig. 1, according to one embodiment of the invention, the basic knot of optical film 100 disclosed herein Structure includes three layers of optical material：Basic unit 110, interlayer 120 and coating 130.The lower surface 111 of the remote interlayer 120 of basic unit 110 Substantially flat surface, and the upper surface 112 relative with lower surface 111 is the wavy texture surface with peak and valley. In preferred embodiments, wavy profile can take randomly shaped, and specific pattern, and wavy profile can be not present It is two-dimentional.That is, the cross-sections surfaces tomography of basic unit 110 in any direction can have the structure shown in Fig. 1. In preferred embodiment, the characteristic length between peaks or valleys be by millimeter or it is smaller in units of, it is therefore preferable to 2mm or smaller, And the difference in height between adjacent peak and valley is in micrometer range, preferably 100 microns or smaller.Basic unit 110 can be any Optical material, including glass, transparent optical polymer film (such as polymethyl methacrylate, makrolon, polyester, poly- to benzene Dioctyl phthalate second diester (PET) film).
In preferred embodiments, interlayer 120 is the thin coating of the optical material above the running surface of basic unit, and this covers Layer complies with running surface structure.The refractive index of interlayer 120 is different from the refractive index of basic unit 110.Interlayer 120 can be any optics Material, including titanium dioxide, silica, aluminum oxide or metal (such as silver and aluminium).It is micro- that the thickness of interlayer 120 can be less than one Rice, it is preferable that less than 0.5 micron.Interlayer 120 can also be the multilayer knot for two or more optical materials being sequentially deposited Structure.
In preferred embodiments, coating 130 is placed in the top of interlayer 120, and its following table with sandwich contact Face has the wavy profile coordinated with basic unit 110, and the wavy profile is transformed by interlayer 120.Coating 130 it is upper Surface is substantially flat.The refractive index of coating 130 is identical substantially with the refractive index of basic unit 110.In the side of being preferable to carry out In case, the material composition of basic unit 110 and coating 130 can be identical, to ensure the optics of basic unit 110 and coating 130 Property tight fit.
When on the incident optical film 100 herein disclosed of light, fresnel's law determines that transmitted light will be with entering The substantially the same side of light is penetrated to travel upwardly.The object of the side of optical film 100 is therefore by by the sight of the opposite side in the optical film The person of examining is no faintly clearly to be seen.In preferred embodiment herein disclosed, due to the lateral displacement foot of light Distortion that is enough small and causing the image for being transmitted through optical film is insignificant.
As shown in fig. 1, according to fresnel's law, due to basic unit 110 and interlayer 120 and interlayer 120 and coating 130 Between interface caused by reflected light a series of direction is presented, therefore reflected light is diffusion, and depending on thickness and For the material of interlayer 120, different colors can be shown by diffusing.Optical film 100 disclosed herein can be by Coating as windowpane is attached on windowpane, so that windowpane can show as frosted glass for outside beholder Glass window, but can provide the clearly outside visual field on daytime for user in building simultaneously.Optical film 100 is also used as From projection display formation and the screen of the entirely different real image of the virtual image.
According to the present invention, the basic unit 110 have flat basic unit's lower surface 111 and with the phase of basic unit's lower surface 111 To basic unit upper surface 112, the basic unit upper surface 112 is uneven patterned surface, and the basic unit 110 has the One refractive index n1.The interlayer 120 has interlayer lower surface 121 and the interlayer upper surface relative with the interlayer lower surface 121 122, the interlayer lower surface 121 is arranged on the basic unit upper surface 112, and the interlayer 120 has the second refractive index n2, and And the interlayer 120 substantially conforms to the uneven patterned surface of the basic unit upper surface 112.The coating 130 have coating lower surface 131 and the coating upper surface 132 relative with the coating lower surface 131, the coating Lower surface 131 is arranged on the interlayer upper surface 122, and the coating upper surface 132 is and the base of basic unit's lower surface 111 Parallel flat surface in sheet, and the coating has third reflect rate n3。
According to the present invention, the first refractive index n1With third reflect rate n3It is substantially the same, for example difference be less than 2% or 5%.Also, the second refractive index n2Substantially greater than described first refractive index n1With the third reflect rate n3, such as difference More than 30% or 60%.
In a preferred embodiment as shown in Figure 2, except basic unit 110 as shown in Figure 1, the and of interlayer 120 Outside the basic structure of coating 130, optical film 100 may further include substantial transparent, be attached to optical film 100 The adhesive layer 150 of side.Adhesive layer 150 is provided is attached to substrate (glass, partition wall or the friendship of such as windowpane by optical film 100 The windshield of logical instrument) easy mode.Optical film 100, which may further include, can reduce from basic unit 110 or covering The reflecting layer 140 that disappears of the first surface reflection of surface/Air Interface of layer 130.Disappearing reflecting layer 140 can be in manufacture optical film Get on during basic structure as outer covering layer deposition, or can be after manufacture optical film basic structure by business anti-reflective film Attachment is got on.
In alternate embodiment as shown in Figure 3, except being occupied as shown in Figure 1 in the plane of optical film 100 In surface wavy profile outside, wavy texture in basic unit 110 and can be had by the structure of its interlayer 120 determined relative In the overall tilt angle [alpha] of the plane of optical film 100.In this case, can still it be kept by the transmitted light of optical film 100 With the direction identical direction of incident light, however, the direction of reflected light can be as shown in Figure 3 around being determined by inclined angle alpha Center position is distributed.
The basic technology of basic unit 110 of Fig. 4 diagram manufactures with predetermined running surface structure.First by with it is any with The template 116 of machine shape or the predetermined surface micro-structural of some patterns, one layer of optical material of deposition is (such as optically transparent poly- Polymer resin).Optical clear resin will comply with the micro-structural of template, and its surface away from template can be plane.It Afterwards, deposited film can be cured via the combination of light-initiated technique, heat curing process or both curing process. After optical film solidification, the film is stripped to obtain the basic unit 110 with predetermined grade micro-surface structure from template.
Several optical material is used as optical clear resin.Specifically, optical resin can be based on propylene The polymer of acid.Optical resin can also be the polymer based on urethane or based on dimethyl silicone polymer.Optical resin Can be deposited on by using any one wet coating process in template 116, including rotary coating, offset printing, concave surface apply coated with And slit die paint-on technique.
Another method is, the basic unit 110 with a surface wavy profile can be by flat upper of its original Surface 112 is handled to obtain.The treatment technology can include brute-force mechanical wear, such as using any sand paper or abrasive material Object is mechanically polished to surface.Preferably, as shown in Figure 5, the post-processing technology of generation basic unit 110 includes pre- with having The roller for determining surface micro-structure carries out nip drum to film.Such technique can include the heating technique for softening optical film, and such as Shown in Fig. 5, basic unit 110 can include substrate 160 and top layer 170.
Fig. 6 diagrams make transparent diffusing reflection optics disclosed herein from the basic unit 110 with predetermined surface micro-structural A kind of illustrative processes of film 100.As shown in Figure 6, depositing operation passes through in basic unit 110, and wherein interlayer 120 includes such as TiO2 Optical material.Coating can be held in vacuum environment by using such as sputter coating technology or physical gas phase deposition technology OK.Coating can also be performed outside vacuum chamber by using the technique of such as former base layer deposition techniques.It is exemplary at one In coating processes, TiO thick 55nm2Layer be applied to above the glass of surface roughening to strengthen the light from the surface Diffusing reflection.After the deposition of interlayer 120, by using wet coating process deposit optical transparent resin formation coating 130.Light Learn resin can be material that refractive index is matched with basic unit 110 or substantially with the material phase for making basic unit 110 Same material.Coating processes can use any wet application technology, including rotary coating, Meyer bar coatings, concave surface coating, Offset printing or slot coating techniques.Then coated coating 130 is properly cured to obtain transparent diffusing reflection optical film 100。
Fig. 7 is the structural representation of the optical film 100 according to one embodiment of this invention.Wherein, thickness as described herein Spend the thickness that d is the normal direction of interlayer 120.As shown in fig. 7, the interlayer 120 of optical film 100 is wavy texture surface.Wherein, The distance between adjacent peaks or adjacent trough of the interlayer 120, i.e. characteristic length L1, no more than 2mm.Preferably, it is described Characteristic length L between the adjacent peaks of interlayer 120 or adjacent trough1No more than 0.5mm.It is highly preferred that the phase of the interlayer Characteristic length L between adjacent wave peak or adjacent trough1No more than 0.1mm.
Fig. 8 is the schematic diagram of the thickness profiles of interlayer 120 corresponding with Fig. 7.As shown in figure 8, the institute of the interlayer 120 State the distance between adjacent peaks or adjacent trough of the change curve of thickness d, i.e. characteristic length L2, no more than 2mm.It is preferred that Ground, the characteristic length L between the adjacent peaks or adjacent trough of the change curve of the thickness d of the interlayer2No more than 0.5mm.It is highly preferred that the feature between the adjacent peaks or adjacent trough of the change curve of the thickness d of the interlayer is long Spend L2No more than 0.1mm.
Wherein, the average thickness of the interlayer 120No more than 1 μm.Preferably, the interlayer 120 is described average ThicknessNo more than 0.5 μm.It is highly preferred that the average thickness of the interlayerNo more than 0.1 μm.
According to the present invention, the change of the thickness d of the interlayer 120 and average thicknessCompared to can ± 50% scope Interior, research is it is also shown that can control the mist degree of optical film within 5% in such scope.Preferably, the interlayer The change of thickness d and average thicknessCompared to can be studied in the range of ± 20% it is also shown that permissible in such scope The mist degree of optical film is controlled within 2%.It is highly preferred that change and the average thickness of the thickness d of the interlayerCompared to can With in the range of ± 10%.Due to the perfect parallelism of the upper and lower surface that need not detect and control the interlayer 120 and heavy The strict conformance of the thickness of interlayer of product or plating, enormously simplify the preparation technology of optical film 100 so that optical film 100 is with low Cost large-scale production is possibly realized.
According to an embodiment, the basic unit 110 by PET substrate 160 with polymerize after the structure of Optical transparent adhesive top layer 170 Into, the coating 130 by polymerizeing after optical clear glue material constituted with PET film material, and the interlayer 120 is clipped in Between Optical transparent adhesive material layer after lower two layers of polymer and by TiO2Material is constituted.Wherein, the first refractive index n1And institute State third reflect rate n3It is about 1.51, the second refractive index n2For 2.55-2.76, itself and n1Or n3Contrast it is more big more It is good, and the average thickness of the interlayer 120It is about 55nm.According to another embodiment, the interlayer 120 includes gold Belong to layer, the metal level is aluminium lamination or silver layer.Wherein, the thickness of the metal level is about 10nm to about 50nm.
Fig. 9 illustrates one of transparent diffusing reflection optical film 100 disclosed herein and exemplary used.Optical film 100 is attached On the penetrating glass for two rooms of separation.In a room, police personnel or public security official question a suspect, and And using another room where the official than observing, light irradiates more brightly in the room.The official's energy observed Suspect and interrogation process are enough seen clearly that, and suspect can not be aware of the presence of the official observed.When such When glass is used as installing a part for windowpane between floors, user can be with clearly without barrier in building The outside visual field hindered, and the beholder outside building only can see that the window of scattering, and at most only see in building The fuzzy image of the object in portion.
Figure 10 illustrates another in amplification vehicles display of transparent diffusing reflection optical film and exemplary used.Optics Film 100 is attached on the windshield of the vehicles, and projecting apparatus by image projection on optical film.Optical film 100 it is saturating Bright property, which allows vehicle operator to have, includes the accessible surrounding environment visual field of condition of road surface.Meanwhile, optical film 100 Diffusing reflection property enable projecting apparatus to form image on the windshield and display information so that vehicle operator will It can be seen that on the key message of the situation of the vehicles, GPS information or any crucial letter that can be expanded over the display Breath.
Although the disclosure mainly describes the embodiment party of the present invention with three layers of (basic unit, interlayer and coating) core texture Case, it will be appreciated by those skilled in the art that within the scope of the present invention, however not excluded that can be with the either side of optical film There are other layers, for example, binder course, adhesive linkage, enhancement layer, the reflecting layer that disappears, absorbed layer, antireflection layer etc., also, art technology Personnel should be appreciated that these layers are understood to be a part for basic unit or coating.
In addition, it will be appreciated by those skilled in the art that within the scope of the present invention, however not excluded that described in optical film There can also be other layers between any two layers of three layers (basic unit, interlayer and coating), for example, binder course, adhesive linkage, reinforcement Layer, enhancement layer, the reflecting layer that disappears, absorbed layer, antireflection layer etc., and it will be appreciated by those skilled in the art that these layers can be by It is not understood as a part for interlayer, basic unit or coating.
Above the description to disclosed embodiment is provided so that any person skilled in the art can make Or use the present invention.What the various modifications to these embodiments will be readily apparent that for those skilled in the art, and In the case of not departing from the spirit or scope of the present invention, generic principles defined herein goes for other embodiment party Case.Therefore, the present invention is not intended to be limited to embodiment shown herein, but to be given and original disclosed herein The reason widest range consistent with novel feature.It is intended that appended claims and its claim quilt introduced later It is construed to be included in all such changes, modification, displacement, addition and sub-portfolio in their true spirit and scope.

Claims (28)

1. a kind of optical film, the optical film includes：
Basic unit, the basic unit has flat basic unit's lower surface and the basic unit upper surface relative with basic unit's lower surface, described Basic unit upper surface is uneven patterned surface, and the basic unit has first refractive index n1,
Interlayer, the interlayer has under interlayer lower surface and the interlayer upper surface relative with the interlayer lower surface, the interlayer Surface is arranged on the basic unit upper surface, and the interlayer has the second refractive index n2, and the interlayer substantially conforms to The uneven patterned surface of the basic unit upper surface, and
Coating, the coating has coating lower surface and the coating upper surface relative with the coating lower surface, The coating lower surface is arranged on the interlayer upper surface, and the coating upper surface is basic with basic unit's lower surface Upper parallel flat surface, and the coating has third reflect rate n3,
Wherein, the first refractive index n1With third reflect rate n3It is substantially the same, the second refractive index n2Substantially greater than institute State first refractive index n1With the third reflect rate n3, and change and the average thickness of the thickness d of the interlayerCompared to ± In the range of 50%.
2. optical film as claimed in claim 1, wherein, the change of the thickness d of the interlayer and average thicknessCompared to ± In the range of 20%.
3. optical film as claimed in claim 1, wherein, the change of the thickness d of the interlayer and average thicknessCompared to ± In the range of 10%.
4. the optical film as described in one of claims 1 to 3, wherein, the uneven patterned surface is wavy texture Surface.
5. optical film as claimed in claim 4, wherein, the characteristic length between the adjacent peaks of the interlayer or adjacent trough L1No more than 2mm.
6. optical film as claimed in claim 4, wherein, the characteristic length between the adjacent peaks of the interlayer or adjacent trough L1No more than 0.5mm.
7. optical film as claimed in claim 4, wherein, the characteristic length between the adjacent peaks of the interlayer or adjacent trough L1No more than 0.1mm.
8. optical film as claimed in claim 4, wherein, the adjacent peaks of the change curve of the thickness d of the interlayer or Characteristic length L between adjacent trough2No more than 2mm.
9. optical film as claimed in claim 4, wherein, the adjacent peaks of the change curve of the thickness d of the interlayer or Characteristic length L between adjacent trough2No more than 0.5mm.
10. optical film as claimed in claim 4, wherein, the adjacent peaks of the change curve of the thickness d of the interlayer or Characteristic length L between adjacent trough2No more than 0.1mm.
11. optical film as claimed in claim 4, wherein, the difference in height between the crest and trough of the interlayer is not more than 200 μm。
12. optical film as claimed in claim 4, wherein, the difference in height between the crest and trough of the interlayer is not more than 100 μm。
13. optical film as claimed in claim 4, wherein, the difference in height between the crest and trough of the interlayer is not more than 50 μ m。
14. optical film as claimed in claim 4, wherein, the average thickness of the interlayerNo more than 1 μm.
15. optical film as claimed in claim 4, wherein, the average thickness of the interlayerNo more than 0.5 μm.
16. optical film as claimed in claim 4, wherein, the average thickness of the interlayerNo more than 0.1 μm.
17. optical film as claimed in claim 4, wherein, the interlayer is two layers or more layer mutually substantially conformal son The sandwich construction that layer is constituted.
18. optical film as claimed in claim 4, wherein, the interlayer is the mutually substantially guarantor of two or more materials The sandwich construction that the sublayer of shape is constituted.
19. optical film as claimed in claim 4, wherein, the basic unit is composite construction, and the composite construction is included substantially Substrate in uniform thickness, and adhesion over the substrate and upper surface be the wavy texture surface top layer.
20. optical film as claimed in claim 19, wherein, the material of the substrate is clear glass.
21. optical film as claimed in claim 19, wherein, the material of the substrate is deformable flexible plastic film material.
22. optical film as claimed in claim 21, wherein, the flexible plastic film material is PET material.
23. optical film as claimed in claim 19, wherein, the top layer is by light or thermal polymerization, the optics of solidification Transparent adhesive tape material layer.
24. optical film as claimed in claim 19, wherein, the basic unit by PET substrate with polymerize after Optical transparent adhesive table Layer material is constituted, the coating by polymerizeing after optical clear glue material constitute, and the interlayer is by TiO2Material is constituted.
25. optical film as claimed in claim 19, wherein, the basic unit by PET substrate with polymerize after Optical transparent adhesive table Layer material is constituted, the coating by polymerizeing after optical clear glue material constituted with PET film material, and the interlayer is clipped in Up and down between the Optical transparent adhesive material layer after two layers of polymer and by TiO2Material is constituted.
26. optical film as claimed in claim 25, wherein, the refractive index n of the Optical transparent adhesive material layer3About 1.51, And the TiO2The average thickness of interlayerIt is about 55nm.
27. the optical film as described in claim 1,2,3,17, one of 18, wherein, the interlayer includes metal level, the metal Layer can be aluminium lamination or silver layer.
28. optical film as claimed in claim 27, wherein, the thickness of the metal level is about 10nm to about 50nm.
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