CN101452088B - Low or zero birefraction optical film and method for manufacturing same - Google Patents
Low or zero birefraction optical film and method for manufacturing same Download PDFInfo
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- CN101452088B CN101452088B CN2007101962738A CN200710196273A CN101452088B CN 101452088 B CN101452088 B CN 101452088B CN 2007101962738 A CN2007101962738 A CN 2007101962738A CN 200710196273 A CN200710196273 A CN 200710196273A CN 101452088 B CN101452088 B CN 101452088B
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Abstract
The present invention discloses a low or zero birefraction optical film and a manufacturing method thereof. The low or zero birefraction optical film comprises a plurality of layers of birefraction optical films, wherein, the long axes of the birefraction optical film are vertical and superposed with each other, and the summation of refraction ratio in x-direction is equal with the summation of refraction ratio in y-direction in the superposed birefraction optical film. The arrangement of birefraction optical films in the low or zero birefraction optical film can settle the problem that the optical grade macromolecule material can not be applied to the optical element because of the existence of birefractive property.
Description
Technical field
The present invention relates to a kind of optical thin film and manufacture method thereof, and be particularly related to a kind of low or zero birefraction optical film and manufacture method thereof.
Background technology
Macromolecular material has characteristics such as light weight, kind be various, use the application of glass material in image record, optically read first-class tradition in recent years as material, gradually be substituted because of macromolecular material tool light weight, characteristic such as shock-resistant gradually, and macromolecule is except above-mentioned characteristic, still possess the characteristic that easily shapes is arranged, process technology commonly used all can be applicable in the product processing of macromolecule material as extruding or ejection formation forming techniques such as (Extrusion or injectionmolding).For present LCD, be the glass material owing to constitute the main composition important document of LCD, along with LCD is used in the various working environments widely, the constitutive requirements of LCD also be required to possess have lighter, thinner, simultaneously also need to improve performances such as resistance to impact, if can effectively bring into play the application requirements that the above-mentioned characteristic of macromolecular material must reach LCD.
Though macromolecular material possesses above-mentioned advantageous characteristic is arranged, and the potentiality that are applied in optical element are arranged, but in fact up to the present fail fully to be used on the various optical elements, main cause is all to have birefringence (Birefringence) in response to the goods major part that the optical grade macromolecular material that is used for optical element is stated shaping process technology gained in the use, this birefringence can produce significant impact in the optical element practical application, and then influences the functional of optical element.
The birefringence of macromolecular material and formation reason thereof are widely known by the people already, in other words, usually nearly all as the employed macromolecular material of optical material, the optical anisotropy (Optically anisotropic) that its monomer (monomer) that forms high molecular polymer has refractive index, the optical anisotropy of this monomer is arranged on the polymkeric substance with certain orientation, that is to say because of orientation makes macromolecular material to produce birefringence.This orientation birefringence has the problem of especially severe in the application of polarity, write and the optical element of the laser disc of erasing type for example developed are in recent years used.Writing and wiping the reading light beam or write light beam when using light beam of polarized light of laser disc, can be because this light path having the optical characteristics of birefringence in (laser disc itself, read camera lens etc.), and influence the precision that reads or write.On the application end of lcd products, the structure of liquid crystal display cells is as everyone knows between the polariscope and analyzer as polariscope or parallel nicols, utilize liquid crystal layer to make the polarization corrugated rotation of polarisation, control printing opacity or light tight, therefore the birefringence that constitutes each above-mentioned member in the liquid crystal display cells can cause significant impact, and this problem can hinder the polymeric optical material and be widely used in liquid crystal display cells.
So-called " optical isotropy (Optically isotropic) " means for the optical characteristics of certain material such as the absorbance log of refractive index and light, all has same nature, independent of direction on any direction of material.With respect to optical isotropy, " optical anisotropy " then is that optical characteristics can change with the different directions of material, so the class material has the characteristic of birefringence (Birefringence).Strictly speaking, only the material of considerably less part is to belong to optically isotropic, even transparent or the macromolecular material of partially transparent such as tygon (Polyethylene) or all non-complete optical isotropy of polymethylmethacrylate (Polymethylmethacrylate), its birefraction does not equal zero.In addition, even certain macromolecular material has optical isotropy completely, but after processing extruding or ejection formation supervisor, still can produce stress (stress) in its direction that flows to macromolecule, or owing to the deformation that stretches and produce, thereby cause molecules align to have the orthodromic, cause the birefringence of material.
Institute's variety of way of doing was to reduce or to offset aforesaid forward birefringence in the past, as international application no PCT/JP95/01635 (international publication number WO96/06370), be (as PMMA with transparent macromolecule resin, PC etc.) be base material, interpolation can be with this polymer base material through processing extruding or ejection formation (Extrusion or injection molding) supervisor low molecule organic matter forward, the birefringent characteristic that this low molecule organic matter had must be different with the birefringent characteristic of polymer base material, reduce or offset the birefringent characteristic of polymer base material by birefringent characteristic that this low molecule organic matter had, and obtain the optical grade macromolecule resin material of low or zero birefraction because of forward being produced.But adopt the prepared zero birefraction polymer base material of these means, can produce the plastic effect of macromolecular material, cause problem points such as the reduction of polymer base material thermotolerance, barrier properties for gases variation because of the interpolation of low molecule organic matter.
As United States Patent (USP) the 4th, 785, No. 053, for copolymerization (co-polymerize) possesses positive and negative birefringence monomer such as methacrylate (methyl methacrylate), styrene materials such as (Styrene), this copolymerization macromolecule is via processing ejection formation (Injection molding) supervisor, and obtains the optical grade macromolecule resin material of low-birefringence.But the prepared low-birefringence macromolecular material of the technology that adopts these means, its physical property such as glass transformation temperature (Glass transition temperature is called for short Tg) are difficult for controlling.
As international application no PCT/JP00/06880 (international publication number WO01/25364), be (as PMMA by transparent macromolecule resin, PC etc.) be base material, add fine dead matter with birefringence, these dead matter such as its representational crystallizable mineral major part all have the birefringent characteristic much larger than organic compound, particularly have its arrangement of birefringent crystallization and have anisotropy, be not to be forward just produce birefringent characteristic by extending as macromolecule, so add these dead matter reducing or to offset the birefringent characteristic of polymer base material, and then optical grade polymer base material that obtains having low or zero birefraction characteristic because of forward being produced with birefringent characteristic.Adopt the technology regular meeting of these means to be accompanied by the problem that inorganic particulate disperses and take place light scattering, a highest wisdom two material refractive index differences greater than 0.5 or the inorganic particulate size greater than 100nm promptly light scattering can take place, so the problem that also can cause the transparency to reduce.
Summary of the invention
The invention provides a kind of low or zero birefraction optical film, under above-mentioned background, for solving the birefringence problem that macromolecular material is applied in the optical element to be produced, be under the prerequisite in the rerum natura that does not influence macromolecular material simultaneously, reach and make macromolecular material be applied to birefringence that optical element produces to approach zero or be zero, and can on the practical application end, not produce harmful effect.
The present invention provides a kind of manufacture method of low or zero birefraction optical film again, can solve the optical grade macromolecular material and can't be applied in problem on the optical element because having birefringence.
The present invention proposes a kind of low or zero birefraction optical film, the birefringent film that comprises multilayer, wherein, the major axis of these birefringent films is vertically superposed mutually, and these overlapping birefringent films equal refractive index summation in the y direction in the refractive index summation of x direction.
Described according to embodiments of the invention, the number of plies of above-mentioned birefringent film for example is two-layer to six layers.
Described according to embodiments of the invention, above-mentioned each layer birefringent film for example is identical film.
Described according to embodiments of the invention, above-mentioned each layer birefringent film for example is different films.
Described according to embodiments of the invention, comprise identical film and different films in the above-mentioned birefringent film.
The present invention proposes a kind of method for preparing low or zero birefraction optical film in addition, the method comprises the birefringent film of overlapping multilayer, make the major axis of these birefringent films vertical mutually, and these overlapping birefringent films equal refractive index summation in the y direction in the refractive index summation of x direction.
Described according to embodiments of the invention, also comprise the multiple blooming that stretches before above-mentioned overlapping these birefringent films, cut out these bloomings more respectively, to form different birefringent films.
Described according to embodiments of the invention, also comprise the stretching blooming before above-mentioned overlapping these birefringent films, cut out this blooming again, to form identical birefringent film.
Described according to embodiments of the invention, the method for above-mentioned overlapping these birefringent films comprises direct pressing birefringent film or with bonding agent applying birefringent film.
Described according to embodiments of the invention, the number of plies of above-mentioned birefringent film for example is two-layer to six layers.
Described according to embodiments of the invention, the method for above-mentioned overlapping these birefringent films comprises three steps, at first, and at the unidirectional coating optical high molecular of substrate surface solution.Then, dry this optical high molecular solution.Then, this base material revolved turn 90 degrees, and repeat above-mentioned three steps at least once.And the number of times that repeats above-mentioned three steps can be once to five times.
Described according to embodiments of the invention, above-mentioned optical high molecular solution comprises solvent evaporates type Polymer Solution or photo-hardening type Polymer Solution.
Described according to embodiments of the invention, above-mentioned photo-hardening type Polymer Solution for example can be through the sclerosis of linear polarization type UV-irradiation, to have birefringence.
The present invention has the characteristic of refractive index complementation by storeroom, the optical thin film that two-layer or multilayer is had identical or different birefraction, in the mutual vertically superposed mode of major axis, make it produce refractive index and level off to zero effect, realize low or zero birefraction material, improve to utilize extruding or processing modes such as ejaculation when preparing the optical grade macromolecule membrane, film produces the birefringence effect that extension effect or stress distribution inequality are caused because of processing mode.
For above-mentioned and other purposes, feature and advantage of the present invention can be become apparent, embodiment cited below particularly, and conjunction with figs. are described in detail below.
Description of drawings
Fig. 1 is the schematic perspective view according to a kind of low or zero birefraction optical film of first embodiment of the invention.
Fig. 2 A is a kind of flow process vertical view for preparing low or zero birefraction optical film according to second embodiment of the invention to Fig. 2 B.
Fig. 3 A is the curve map of the anglec of rotation of zones of different among Fig. 2 B to penetration to Fig. 3 C.
Fig. 4 is a kind of process step figure for preparing low or zero birefraction optical film according to third embodiment of the invention.
Fig. 5 A then is the flow process vertical view and the partial enlarged drawing of the low or zero birefraction optical film of the 3rd embodiment to Fig. 5 C.
Fig. 6 is a kind of process step figure for preparing low or zero birefraction optical film according to fourth embodiment of the invention.
Description of reference numerals
100,202,204,500,502: birefringent film
200: base material
206,504: lap
400～404,600～604: step
n
1, n
4, n
5, n
8: the major axis refractive index
n
2, n
3, n
6, n
7: the minor axis refractive index
Embodiment
Fig. 1 is the schematic perspective view according to a kind of low or zero birefraction optical film of first embodiment of the invention.Please refer to Fig. 1, the low or zero birefraction optical film of first embodiment comprises the birefringent film 100 of multilayer, and wherein these birefringent films 100 respectively have n on major axis and minor axis
1/ n
2, n
4/ n
3, n
5/ n
6, n
8/ n
7Birefraction, the major axis of these birefringent films is vertically superposed mutually, and its refractive index summation can be cancelled out each other.That is, at the refractive index summation (n of x direction
1+ n
3+ n
5+ n
7) the refractive index summation (n that equals in the y direction
2+ n
4+ n
6+ n
8), so can form isotropy (Isotropic) optical thin film after overlapping.Low or zero birefraction optical film after this is overlapping promptly has optical isotropy in theory.And in first embodiment, the number of plies of overlapping birefringent film 100 is four layers, but also can be according to material, optical characteristics or other considerations, with the number of plies minimizing or the increase of birefringent film 100; For example consider the factor of thickness, the number of plies of birefringent film 100 can be made as two-layer to six layers.In addition, each birefringent film 100 can be the film with identical major axis refractive index and identical minor axis refractive index; It perhaps can be film with mutually different major axis refractive index and mutually different minor axis refractive index.In addition, the low or zero birefraction optical film of first embodiment is made of with different birefringent film identical birefringent film.
Fig. 2 A then is a kind of flow process vertical view for preparing low or zero birefraction optical film according to second embodiment of the invention to Fig. 2 B.
At first, please refer to Fig. 2 A, one deck birefringent film 202 is provided on base material 200, wherein base material 200 for example is a glass baseplate.As for, the material of birefringent film 202 for example is general macromolecular material or is added with liquid crystal or the polymeric membrane of other organic or inorganic materials, can make film via the anisotropy stretch process, and its formation method for example is coating, bonding or other methods that are fit to birefraction.
Then, please refer to Fig. 2 B, the birefringent film 204 of overlapping another layer makes birefringent film 202 vertical mutually with 204 major axis, and overlapping birefringent film 202 and the 204 refractive index summations in the x direction must equal the refractive index summation in the y direction.Thus, by the prepared low or zero birefraction optical film of second embodiment, be the lap 206 of two-layer birefringent film 202 and 204.
Fig. 3 A is the curve map of the anglec of rotation of zones of different among Fig. 2 B to penetration (Rotated angleversus Transmittance) to Fig. 3 C.
At first, please refer to Fig. 3 A, it is without any the overlapping zone (as the upper left side of lap 206) thereon of birefringent film among Fig. 2 B.Therefore under the state of parallel polarisation, be 0 when spending in the anglec of rotation, present the high-penetration degree, and when the anglec of rotation be 90 when spending, then change the low penetration degree into.
Then, please refer to Fig. 3 B, it is for having only the zone (as the top of lap 206) of simple layer birefringent film among Fig. 2 B.Therefore under the state of parallel polarisation, be 0 when spending in the anglec of rotation, present the material of low penetration degree, and when the anglec of rotation be 90 when spending, present the high-penetration degree.At this moment because the optical characteristics of birefringent film itself, the variation that causes penetration just with have only the regional opposite of base material.
Then, please refer to Fig. 3 C, it is the overlapping region (being lap 206) of two-layer birefringent film among Fig. 2 B.Therefore under the state of parallel polarisation, be 0 when spending in the anglec of rotation, present the material of high-penetration degree, and when the anglec of rotation be 90 when spending, present the low penetration degree.
Comparison chart 3A and Fig. 3 C can find that both anglecs of rotation are the same to the curve map of penetration; That is to say that the penetration performance of the lap 206 of Fig. 2 B is consistent with the penetration performance of having only base material 200 merely.In brief, has optically isotropic optical characteristics according to the prepared low or zero birefraction optical film of second embodiment.
Fig. 4 is a kind of process step figure for preparing low or zero birefraction optical film according to third embodiment of the invention.
Please refer to Fig. 4, carry out step 400 earlier, the stretching blooming, its technology for example is with transparent macromolecular material or is added with liquid crystal or other organic and polymeric membranes inorganic material, via the anisotropy stretch process, and can stretch single kind of blooming or multiple different blooming.
Then, carry out step 402, cut out blooming, to form the multilayer birefringent film.When blooming has only a kind ofly, then after cutting out, can form identical multilayer birefringent film; And work as blooming is different types of, then need cut out respectively, to form different multilayer birefringent films.
Then, carry out step 404, overlapping birefringent film makes the major axis of birefringent film vertical mutually, and overlapping birefringent film must equal refractive index summation in the y direction in the refractive index summation of x direction.Wherein, the number of plies of overlapping birefringent film for example is two-layer to six layers.And the method for overlapping birefringent film is the direct above-mentioned birefringent film of pressing or with the bonding agent above-mentioned birefringent film of fitting for example, and makes the optical grade high molecular film material with low or zero birefraction characteristic.In addition, therefore the dried thickness of bonding agent can't influence the refractivity of blooming because of very little.
Fig. 5 A then is the flow process vertical view and the partial enlarged drawing of the low or zero birefraction optical film of the 3rd embodiment to Fig. 5 C.
At first, please refer to Fig. 5 A, the left side is one deck birefringent film 500, and the right side is its partial enlarged drawing, can find out that by partial enlarged drawing the draw direction of this birefringent film 500 is for to advance along x direction both sides.That is to say that the long axis direction of this birefringent film 500 is the x direction, its short-axis direction is y direction (not illustrating).
Then, please refer to Fig. 5 B, the left side is another layer birefringent film 502, and the right side is its partial enlarged drawing, can find out that by partial enlarged drawing the draw direction of this birefringent film 502 is for to advance along y direction both sides.That is to say that the long axis direction of this birefringent film 502 is the y direction, its short-axis direction is x direction (not illustrating).
Then, please refer to Fig. 5 C, when birefringent film 500 and birefringent film 502 were overlapping, the partial enlarged drawing of its lap 504 can find out that by partial enlarged drawing this lap is the isotropy optical thin film on the right side of figure.
Fig. 6 is a kind of process step figure for preparing low or zero birefraction optical film according to fourth embodiment of the invention.Please refer to Fig. 6, carry out step 600 earlier, at the unidirectional coating optical high molecular of substrate surface solution.This optical high molecular solution is solvent evaporates type Polymer Solution or photo-hardening type Polymer Solution for example.When optical high molecular solution was photo-hardening type Polymer Solution, it can be through the sclerosis of linear polarization type UV-irradiation, to have birefringence.
Then, carry out step 602, dry this optical high molecular solution.Drying means is natural air drying, baking or other modes that is fit to.Then, carry out step 604, this base material is revolved turn 90 degrees.Afterwards, repeating step 600 to step 604 at least once.In the 4th embodiment, its repeating step 600 arrives the number of times of step 604 for example once to five times.
The 4th embodiment is to use the unidirectional mode of filming basically, and membrane material is coated on the base material, after the drying base material is rotated an angle of 90 degrees, once more the coated film material.During unidirectional class coating material, the directivity that will form membrane material is arranged, and causes having birefringence, and the material of coated film once more of rotation an angle of 90 degrees, as tensioning system as described in the 3rd embodiment, can cancel out each other in theory, and make low or zero birefraction optical film.
In sum, the present invention is by the mode of overlapping two-layer or two-layer above birefringent film, make it form low or zero birefraction optical film, the method that it adopted has to be simplified technology, do not influence the physical characteristics of polymer base material and not to have the advantage of adding the material dispersing uniformity, and there is not the problem that the light scattering and the transparency reduce, can make simultaneously the transparent polymer base material reach the characteristic of the low or zero birefraction of tool again, be the means with commercialization value and competitive edge.
Though the present invention discloses as above with preferred embodiment; right its is not in order to limit the present invention; those skilled in the art without departing from the spirit and scope of the present invention, when can doing a little change and retouching, so protection scope of the present invention is when looking being as the criterion that accompanying Claim defines.
Claims (15)
1. low or zero birefraction optical film comprises:
The birefringent film of multilayer, wherein
The major axis of this birefringent film is vertically superposed mutually; And
Overlapping described birefringent film equals refractive index summation in the y direction in the refractive index summation of x direction.
2. low or zero birefraction optical film as claimed in claim 1, wherein the number of plies of this birefringent film is two-layer to six layers.
3. low or zero birefraction optical film as claimed in claim 1, wherein each layer birefringent film is identical film.
4. low or zero birefraction optical film as claimed in claim 1, wherein each layer birefringent film is different films.
5. low or zero birefraction optical film as claimed in claim 1 wherein comprises identical film and different films in this birefringent film.
6. method for preparing low or zero birefraction optical film, comprise: the birefringent film of overlapping multilayer, make the major axis of this birefringent film vertical mutually, and overlapping described birefringent film equal refractive index summation in the y direction in the refractive index summation of x direction.
7. also comprise before the method for the low or zero birefraction optical film of preparation as claimed in claim 6, wherein overlapping this birefringent film:
Multiple blooming stretches; And
Cut out this blooming respectively, to form this different birefringent films.
8. the method for the low or zero birefraction optical film of preparation as claimed in claim 7, wherein the method for overlapping this birefringent film comprises this birefringent film of direct pressing or with bonding agent this birefringent film of fitting.
9. also comprise before the method for the low or zero birefraction optical film of preparation as claimed in claim 6, wherein overlapping this birefringent film:
The stretching blooming; And
Cut out this blooming, to form this identical birefringent film.
10. the method for the low or zero birefraction optical film of preparation as claimed in claim 9, wherein the method for overlapping this birefringent film comprises this birefringent film of direct pressing or with bonding agent this birefringent film of fitting.
11. preparation as claimed in claim 6 is low or the method for zero birefraction optical film, wherein the number of plies of this birefringent film is two-layer to six layers.
12. preparation as claimed in claim 6 is low or the method for zero birefraction optical film, wherein the method for overlapping this birefringent film comprises:
A) at the unidirectional coating optical high molecular of substrate surface solution;
B) dry this optical high molecular solution;
C) this base material is revolved turn 90 degrees; And
Repeating step a to step c at least once.
13. preparation as claimed in claim 12 is low or the method for zero birefraction optical film, wherein repeating step a to the number of times of step c for once to five times.
14. preparation as claimed in claim 12 is low or the method for zero birefraction optical film, wherein this optical high molecular solution comprises solvent evaporates type Polymer Solution or photo-hardening type Polymer Solution.
15. preparation as claimed in claim 14 is low or the method for zero birefraction optical film, wherein this photo-hardening type Polymer Solution is through the sclerosis of linear polarization type UV-irradiation, to have birefringence.
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| CN2007101962738A CN101452088B (en) | 2007-12-07 | 2007-12-07 | Low or zero birefraction optical film and method for manufacturing same |
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| CN103706549A (en) * | 2014-01-02 | 2014-04-09 | 三菱重工东方燃气轮机（广州）有限公司 | Method for coating metal surface with oil paint |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4785053A (en) * | 1984-11-02 | 1988-11-15 | Sumitomo Chemical Company, Limited | Optical resin material having improved birefringence |
| US6201045B1 (en) * | 1994-08-18 | 2001-03-13 | Yasuhiro Koike | Non-birefringence optical resin material, a production process therefor and a member for a liquid crystal device using the optical resin material |
| CN1141604C (en) * | 1998-01-13 | 2004-03-10 | 美国3M公司 | Optical film with sharpened bandedge |
-
2007
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4785053A (en) * | 1984-11-02 | 1988-11-15 | Sumitomo Chemical Company, Limited | Optical resin material having improved birefringence |
| US6201045B1 (en) * | 1994-08-18 | 2001-03-13 | Yasuhiro Koike | Non-birefringence optical resin material, a production process therefor and a member for a liquid crystal device using the optical resin material |
| CN1141604C (en) * | 1998-01-13 | 2004-03-10 | 美国3M公司 | Optical film with sharpened bandedge |
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