WO2016060170A1 - 偏光板及びその製造方法、媒体 - Google Patents
偏光板及びその製造方法、媒体 Download PDFInfo
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- WO2016060170A1 WO2016060170A1 PCT/JP2015/079067 JP2015079067W WO2016060170A1 WO 2016060170 A1 WO2016060170 A1 WO 2016060170A1 JP 2015079067 W JP2015079067 W JP 2015079067W WO 2016060170 A1 WO2016060170 A1 WO 2016060170A1
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- WIPO (PCT)
- Prior art keywords
- resin layer
- polarizing plate
- pattern
- mold
- uneven
- Prior art date
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- 238000004519 manufacturing process Methods 0.000 title claims description 27
- 238000000034 method Methods 0.000 title claims description 15
- 229920005989 resin Polymers 0.000 claims abstract description 95
- 239000011347 resin Substances 0.000 claims abstract description 95
- 239000000758 substrate Substances 0.000 claims description 23
- 239000011342 resin composition Substances 0.000 claims description 16
- 239000002184 metal Substances 0.000 claims description 8
- 229910052751 metal Inorganic materials 0.000 claims description 8
- 229910044991 metal oxide Inorganic materials 0.000 claims description 6
- 150000004706 metal oxides Chemical class 0.000 claims description 6
- 230000001678 irradiating effect Effects 0.000 claims 1
- 239000000463 material Substances 0.000 abstract description 14
- 230000010287 polarization Effects 0.000 abstract description 10
- 239000000178 monomer Substances 0.000 description 7
- -1 polyethylene terephthalate Polymers 0.000 description 5
- 239000010408 film Substances 0.000 description 4
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 description 2
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 238000000151 deposition Methods 0.000 description 2
- 230000005684 electric field Effects 0.000 description 2
- 229910052759 nickel Inorganic materials 0.000 description 2
- 238000006116 polymerization reaction Methods 0.000 description 2
- 229920000098 polyolefin Polymers 0.000 description 2
- 239000010453 quartz Substances 0.000 description 2
- 238000001878 scanning electron micrograph Methods 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 238000004544 sputter deposition Methods 0.000 description 2
- 239000004925 Acrylic resin Substances 0.000 description 1
- 229920000178 Acrylic resin Polymers 0.000 description 1
- CERQOIWHTDAKMF-UHFFFAOYSA-M Methacrylate Chemical compound CC(=C)C([O-])=O CERQOIWHTDAKMF-UHFFFAOYSA-M 0.000 description 1
- 239000004695 Polyether sulfone Substances 0.000 description 1
- 239000004642 Polyimide Substances 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
- 230000003078 antioxidant effect Effects 0.000 description 1
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- 230000008859 change Effects 0.000 description 1
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- 125000004122 cyclic group Chemical group 0.000 description 1
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- 238000003618 dip coating Methods 0.000 description 1
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- 239000000945 filler Substances 0.000 description 1
- 239000003574 free electron Substances 0.000 description 1
- LNEPOXFFQSENCJ-UHFFFAOYSA-N haloperidol Chemical compound C1CC(O)(C=2C=CC(Cl)=CC=2)CCN1CCCC(=O)C1=CC=C(F)C=C1 LNEPOXFFQSENCJ-UHFFFAOYSA-N 0.000 description 1
- 239000003112 inhibitor Substances 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 125000005641 methacryl group Chemical group 0.000 description 1
- 239000003504 photosensitizing agent Substances 0.000 description 1
- 229920003207 poly(ethylene-2,6-naphthalate) Polymers 0.000 description 1
- 229920002492 poly(sulfone) Polymers 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 229920005668 polycarbonate resin Polymers 0.000 description 1
- 239000004431 polycarbonate resin Substances 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229920001225 polyester resin Polymers 0.000 description 1
- 239000004645 polyester resin Substances 0.000 description 1
- 229920006393 polyether sulfone Polymers 0.000 description 1
- 239000011112 polyethylene naphthalate Substances 0.000 description 1
- 229920000139 polyethylene terephthalate Polymers 0.000 description 1
- 239000005020 polyethylene terephthalate Substances 0.000 description 1
- 229920001721 polyimide Polymers 0.000 description 1
- 229920005672 polyolefin resin Polymers 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 229920002050 silicone resin Polymers 0.000 description 1
- 238000004528 spin coating Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- 239000012780 transparent material Substances 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/32—Holograms used as optical elements
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
- G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
- G02B5/3058—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state comprising electrically conductive elements, e.g. wire grids, conductive particles
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
- G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
- G03H1/02—Details of features involved during the holographic process; Replication of holograms without interference recording
Definitions
- the present invention relates to a polarizing plate, a manufacturing method thereof, and a medium having a hologram function using the polarizing plate.
- Patent Document 1 discloses a technique for manufacturing a wire grid polarizing plate by forming a concave / convex pattern having a very short period on a resin film on a resin base material and depositing a metal film thereon.
- Patent Document 1 since the concavo-convex pattern is formed so as to extend in a certain direction within the same plane, the polarization component transmitted through the polarizing plate of Patent Document 1 is the same over the entire surface of the polarizing plate. . However, if different polarization components can be transmitted for each region provided in the plane of the polarizing plate, the polarizing plate can be used for a wider range of applications than in the past.
- the present invention has been made in view of such circumstances, and provides a polarizing plate capable of transmitting different polarization components for each region provided in the plane of the polarizing plate.
- a polarizing plate having a plurality of uneven regions extending in different directions.
- the polarizing plate of the present invention has a plurality of concave and convex regions in which the direction of the concave and convex pattern extends, it is possible to transmit different polarization components for each region provided in the plane of the polarizing plate.
- the plurality of uneven regions are provided at different height positions.
- the concavo-convex pattern has a line and space shape.
- the polarizing layer is made of a conductive metal or metal oxide.
- the transparent resin layer is formed by curing a photocurable resin composition.
- a medium having a hologram function using the polarizing plate described above is provided.
- a photocurable resin composition is applied on a transparent substrate to form a transferred resin layer, and the transferred resin layer is transferred to the transferred resin layer.
- the transferred resin layer is irradiated with active energy rays to cure the transferred resin layer to form a transparent resin layer, and the conductive resin is formed on the transparent resin layer.
- a method for producing a polarizing plate comprising a step of forming a polarizing layer made of a conductive metal or metal oxide, wherein the mold has a plurality of reversal pattern regions in which the reversal patterns extend in different directions.
- the plurality of reverse pattern regions are provided at different height positions.
- the mold is a resin mold.
- FIG. 1 It is a perspective view of the polarizing plate 1 of one Embodiment of this invention.
- (A) to (c) are drawings corresponding to the II cross section in FIG. 1, showing a state in which the polarizing layer 9 is formed on the transparent resin layer 7.
- FIGS. 2A to 2C are cross-sectional views corresponding to the II-II cross section in FIG. However, for convenience of illustration, the shapes of the concave / convex pattern 5 and the reverse pattern 15 are schematically shown. The same applies to FIGS.
- FIG. 4 is a cross-sectional view illustrating a manufacturing process of the polarizing plate 1 continued from FIG. 3.
- 5 is a cross-sectional view showing a manufacturing process of a mold 13 used for manufacturing the polarizing plate 1.
- Polarizing plate A polarizing plate 1 includes a transparent substrate 3, a transparent resin layer 7 formed thereon and having an uneven pattern 5, and a polarizing layer 9 formed on the transparent resin layer 7.
- the transparent resin layer 7 has a plurality of concavo-convex regions 11a, 11b, and 11c in which the concavo-convex pattern 5 extends in different directions.
- the transparent substrate 3 is formed of a transparent material such as a resin substrate or a quartz substrate, and the material is not particularly limited, but is preferably a resin substrate.
- the resin constituting the resin base material include one selected from the group consisting of polyethylene terephthalate, polycarbonate, polyester, polyolefin, polyimide, polysulfone, polyethersulfone, cyclic polyolefin, and polyethylene naphthalate.
- the transparent substrate 3 is preferably in the form of a flexible film, and the thickness is preferably in the range of 25 to 500 ⁇ m.
- the concavo-convex pattern 5 is an elongated concavo-convex pattern, and the extending directions of the concavo-convex pattern 5 are different from each other in the first to third concavo-convex areas 11a to 11c.
- the uneven pattern 5 extends in the direction of arrow A in the first uneven area 11a
- the uneven pattern 5 extends in the direction of arrow B in the second uneven area 11b
- the uneven pattern in the third uneven area 11c The pattern 5 extends in the direction of arrow C.
- the arrow B direction is a direction orthogonal to the arrow A direction
- the arrow C direction is a direction shifted by 45 degrees with respect to the arrow A direction.
- the shape and pitch of the uneven pattern 5 in the first to third uneven regions 11a to 11c may be the same or different.
- the period of the uneven pattern 5 is, for example, 10 nm to 1 ⁇ m, preferably 30 to 500 nm, and more preferably 50 to 200 nm.
- the concavo-convex pattern 5 is preferably in a line and space shape.
- the value of (space width) / (line width) is not particularly limited, but is, for example, 0.2 to 5, preferably 0.5 to 4, and more preferably 1 to 3. If it is too small, the line width is wide, and if it is too large, the space width is widened. Therefore, the polarization component perpendicular to and parallel to the extending direction of the line and space is reflected by the interaction of the electric field with free electrons in the metal. Thus, it does not function as a polarizing layer.
- the first to third uneven regions 11a to 11c may be formed so that the height positions are the same, but it is preferable that the height positions are different from each other as shown in FIG. In this case, there is an advantage that the boundary between adjacent uneven regions becomes clear.
- the transparent resin layer 7 can be formed by curing a photocurable resin composition. Details of the process will be described later.
- the polarizing layer 9 is formed on the transparent resin layer 7 as shown in FIG.
- the polarizing layer 9 may be formed so as to have a function of polarizing incident light, and the material, thickness, shape, and the like are not limited.
- the polarizing layer 9 can be formed of, for example, a conductive metal (Ni, Al, etc.) or a metal oxide (ITO, etc.).
- the polarizing layer 9 may be formed along the shape of the concavo-convex pattern 5 as shown in FIG. 2 (a), and as shown in FIG. It may be formed only on the side surface of the convex portion 7a of the concave-convex pattern 5 as shown in FIG. That is, the polarizing layer 9 may be formed in a film shape as shown in FIG. 2A, or may be formed in a thin line shape as shown in FIGS. 2B to 2C.
- the polarizing plate 1 is a wire grid polarizing plate and has a property of transmitting a polarization component having a vibration surface (surface formed by a vibrating electric field) perpendicular to the extending direction of the uneven pattern 5. Therefore, when non-polarized incident light L is incident on the polarizing plate 1, a polarized component having a vibration plane perpendicular to the arrow A is transmitted through the first uneven region 11a, and perpendicular to the arrow B in the second uneven region 11b. A polarized light component having a vibration plane perpendicular to the arrow C is transmitted through the third uneven region 11c. For this reason, when the non-polarized incident light L is incident on the polarizing plate 1, a plurality of types (three types in the present embodiment) of polarization components can be extracted at a time.
- the polarized light P having a vibration plane perpendicular to the arrow A is incident on the polarizing plate 1, almost all of the polarized light P is transmitted through the first uneven area 11a, and a part of the third uneven area 11c (indicated by the arrow C). Only the polarization component having a vertical vibration surface is transmitted, and almost all of the second uneven region 11b is blocked.
- the polarizing plate 1 is rotated 45 degrees without changing the direction of the vibration plane of the polarized light P, almost all of the polarized light P is transmitted in the third uneven area 11c, and partially in the first and second uneven areas 11a and 11b. Only becomes transparent.
- the transmission state of the polarized light P for each region can be changed only by rotating the polarizing plate 1.
- the polarizing plate 1 of the present embodiment can be efficiently manufactured by a nanoimprint method, and functions other than the polarizing function (depending on the structural color) can be formed when forming an uneven pattern for providing the polarizing function. It is possible to simultaneously form a concave / convex pattern for providing a decorative property. It is also possible to form a medium having a hologram function by forming an uneven pattern for imparting a hologram function to the polarizing plate 1 of the present embodiment.
- the manufacturing method of the polarizing plate 1 of this embodiment includes a transferred resin layer forming step, a transfer and curing step, and a polarizing layer forming step.
- a transferred resin layer forming step includes a transfer and curing step, and a polarizing layer forming step.
- each step will be described in detail with reference to FIGS.
- a photocurable resin composition is applied on the transparent substrate 3 to form a transferred resin layer 19.
- the photocurable resin composition constituting the transferred resin layer 19 contains a monomer and a photoinitiator and has a property of being cured by irradiation with active energy rays.
- Active energy rays is a general term for energy rays that can cure a photocurable resin composition, such as UV light, visible light, and electron beams.
- Monomers include photopolymerizable monomers for forming (meth) acrylic resins, styrene resins, olefin resins, polycarbonate resins, polyester resins, epoxy resins, silicone resins, etc., and photopolymerizable (meth) acrylic.
- System monomers are preferred.
- (meth) acryl means methacryl and / or acryl
- (meth) acrylate means methacrylate and / or acrylate.
- the photoinitiator is a component added to promote the polymerization of the monomer, and is preferably contained in an amount of 0.1 part by mass or more with respect to 100 parts by mass of the monomer.
- the upper limit of content of a photoinitiator is not prescribed
- the photocurable resin composition is a range in which components such as a solvent, a polymerization inhibitor, a chain transfer agent, an antioxidant, a photosensitizer, a filler, and a leveling agent do not affect the properties of the photocurable resin composition. May be included.
- the photocurable resin composition can be produced by mixing the above components by a known method.
- the photocurable resin composition can be applied onto the transparent substrate 3 by a method such as spin coating, spray coating, bar coating, dip coating, die coating, and slit coating to form the transferred resin layer 19. .
- the transferred resin layer 19 has an inverted pattern 15 of the concavo-convex pattern 5 transferred to the transferred resin layer 19.
- the transferred resin layer 19 is irradiated with active energy rays 21 to cure the transferred resin layer 19 to form a transparent resin layer.
- the mold 13 has the reversal pattern 15 on the resin layer 31 on the transparent substrate 23.
- the transparent base material 23 consists of a resin base material, a quartz base material, a silicone base material, etc., and a resin base material is preferable.
- the mold 13 is preferably a resin mold. Details of the method of manufacturing the mold 13 will be described later.
- the reverse pattern 15 has a shape obtained by inverting the concave / convex pattern 5 shown in FIG. 1, a plurality of directions in which the reverse pattern 15 extends are different from each other so as to correspond to the first to third concave / convex regions 11a to 11c.
- Inverted pattern areas (first to third inverted pattern areas) 17a to 17c are provided.
- the first to third inversion pattern regions 17a to 17c are provided at different height positions, like the first to third uneven regions 11a to 11c.
- the pressure for pressing the mold 13 against the transferred resin layer 19 may be any pressure that can transfer the shape of the reversal pattern 15 to the transferred resin layer 19.
- the active energy ray 21 irradiated to the transferred resin layer 19 may be irradiated with an integrated light amount sufficient to sufficiently cure the transferred resin layer 19, and the integrated light amount is, for example, 100 to 10,000 mJ / cm 2 .
- the transferred resin layer 19 is cured by irradiation with the active energy ray 21.
- the active energy ray 21 since the light shielding pattern 25 is formed on the transparent base material 23 of the mold 13, the active energy ray 21 is irradiated from the transparent base material 3 side. When using a mold having no pattern, the active energy ray 21 may be irradiated from the mold side.
- the mold 13 is removed, and the uncured photocurable resin composition is washed away with a solvent, whereby the transparent resin layer 7 having the uneven pattern 5 on the transparent substrate 3 is formed as shown in FIG. A formed structure is obtained.
- the polarizing layer 9 is formed on the transparent resin layer 7 to complete the manufacture of the polarizing plate 1.
- the polarizing layer 9 can be formed, for example, by depositing a conductive metal or metal oxide as a material on the transparent resin layer 7 by sputtering.
- Method for Manufacturing Mold A method for manufacturing the mold 13 that is preferably used for manufacturing the polarizing plate 1 of the present embodiment will be described.
- the mold 13 can be formed by repeating the formation of the resin layer to be transferred and the pattern transfer and curing process a plurality of times.
- the description of the formation of the resin layer to be transferred, the transfer of the pattern and the curing step is the same as that described above for the “manufacturing method of the polarizing plate”, and the description thereof will be omitted as appropriate.
- a photocurable resin composition is applied on a transparent substrate 23 on which a light shielding pattern 25 is formed to form a transferred resin layer 27.
- the transfer resin layer 27 is irradiated with the active energy rays 21 in a state where the mold 29 having the concave and convex pattern 5c is pressed against the transfer resin layer 27.
- the transfer resin layer 27 is cured to form a transparent resin layer 31a having a reversal pattern 15c.
- the active energy ray 21 is irradiated from the mold 29 side to cure the entire surface of the transferred resin layer 27.
- the concave / convex pattern 5c has the same shape as the concave / convex pattern 5 formed in the third concave / convex region 11c, and the reverse pattern 15c has the same shape as the reverse pattern 15 formed in the third reverse pattern region 17c.
- a photocurable resin composition is applied on the transparent resin layer 31 a to form a transferred resin layer 33.
- the active resin 21 is irradiated with the active energy ray 21 in a state where the mold 35 having the uneven pattern 5b is pressed against the transferred resin layer 33.
- the transfer resin layer 33 is cured to form a transparent resin layer 31b having the inversion patterns 15b and 15c as shown in FIG. 6C.
- the concave / convex pattern 5b has the same shape as the concave / convex pattern 5 formed in the second concave / convex region 11b, and the reverse pattern 15b has the same shape as the reverse pattern 15 formed in the second reverse pattern region 17b.
- the active energy ray 21 is irradiated from the transparent base material 23 side to the transferred resin layer 33 through the light shielding pattern 25, only the region of the transferred resin layer 33 that is not covered with the light shielding pattern 25 is cured. Since the light shielding pattern 25 has the same shape as the third inversion pattern region 17c, as shown in FIG. 6C, the inversion pattern 15c remains as it is in the third inversion pattern region 17c.
- the transparent resin layer 31b in which the reverse pattern 15b is formed at a position higher than the three reverse pattern region 17c is formed.
- the active energy ray 21 is irradiated through the light shielding pattern 25 in a state where another transparent substrate having the light shielding pattern 25 is superimposed on the transparent substrate 23. May be.
- the mold 13 without the light shielding pattern 25 can be formed.
- a photocurable resin composition is applied on the transparent resin layer 31 b to form a transferred resin layer 37.
- the transfer resin layer 37 is irradiated with the active energy rays 21 in a state where the mold 39 having the concave / convex pattern 5a is pressed against the transfer resin layer 37.
- the transfer resin layer 37 is cured to form the transparent resin layer 31 having the inversion patterns 15a, 15b, and 15c as shown in FIG.
- the concave / convex pattern 5a has the same shape as the concave / convex pattern 5 formed in the first concave / convex region 11a, and the reverse pattern 15a has the same shape as the reverse pattern 15 formed in the first reverse pattern region 17a.
- the active energy ray 21 is irradiated to the transferred resin layer 33 from the transparent substrate 41 side through the light shielding patterns 43 and 25 in a state where another transparent substrate 41 having the light shielding pattern 43 is superimposed on the transparent substrate 23. Therefore, only the region of the transferred resin layer 33 that is not covered with the light shielding patterns 43 and 25 is cured. Since the light shielding pattern 43 has the same shape as the second inversion pattern region 17b, the inversion patterns 15b and 15c are left as they are in the second and third inversion pattern regions 17b and 17c, as shown in FIG. 7C. In the remaining areas, the transparent resin layer 31 in which the reverse pattern 15a is formed at a position higher than the second reverse pattern area 17b is formed. A region where the reverse pattern 15a is formed becomes the first reverse pattern region 17a.
- the manufacture of the mold 13 is completed through the above steps.
- the concave and convex shapes of the reverse patterns 15a to 15c may be the same or different.
- the concavo-convex shapes of the reversal patterns 15a to 15c are the same, they can be used as the molds 29, 35, and 39 by rotating one mold.
- the method for manufacturing the mold 13 having the reversal pattern 15 having the three-stage configuration has been described.
- What is necessary is just to repeat the process of forming a resin layer, transferring a desired reverse pattern, and curing only a desired region.
- a mold 13 was produced by the method described in “3. Production method of mold”. In the first to third inversion pattern regions 17a to 17c, the inversion patterns 15 having the same line and space shape are formed so as to be shifted from each other by 45 degrees.
- a transfer product was produced by UV nanoimprinting using the produced mold 13 by the method described in “2. Production method of polarizing plate”. SEM images of the obtained transfer product are shown in FIGS. As shown in FIGS. 8A and 8B, proper transfer in a line and space shape was confirmed. In the cross-sectional view of FIG. 8A, the period, line width, and shape height of the line and space shape were measured, and were 117.0 nm, 33.5 nm, and 142.9 nm, respectively.
- a nickel thin film (20 nm) was formed on the pattern surface of the obtained transfer product using a sputtering apparatus.
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Abstract
Description
好ましくは、前記複数の凹凸領域は、互いに異なる高さ位置に設けられる。
好ましくは、前記凹凸パターンは、ラインアンドスペース形状である。
好ましくは、前記偏光層は、導電性の金属又は金属酸化物からなる。
好ましくは、前記透明樹脂層は、光硬化性樹脂組成物を硬化させて形成される。
好ましくは、前記複数の反転パターン領域は、互いに異なる高さ位置に設けられる。
好ましくは、前記モールドは、樹脂製モールドである。
本発明の一実施形態の偏光板1は、透明基材3と、その上に形成され且つ凹凸パターン5を有する透明樹脂層7と、透明樹脂層7に形成された偏光層9を備え、透明樹脂層7は、凹凸パターン5が延びる方向が互いに異なる複数の凹凸領域11a,11b,11cを有する。
透明基材3は、樹脂基材、石英基材などの透明材料で形成され、その材質は、特に限定されないが、樹脂基材であることが好ましい。樹脂基材を構成する樹脂としては、例えば、ポリエチレンテレフタレート、ポリカーボネート、ポリエステル、ポリオレフィン、ポリイミド、ポリサルフォン、ポリエーテルサルフォン、環状ポリオレフィンおよびポリエチレンナフタレートからなる群から選ばれる1種からなるものである。また、透明基材3は可撓性を有するフィルム状であることが好ましく、その厚さは25~500μmの範囲であることが好ましい。
図1に示すように、透明樹脂層7には凹凸パターン5が形成されている。凹凸パターン5は、細長い形状の凹凸パターンであり、第1~第3凹凸領域11a~11cでは、凹凸パターン5が延びる方向が互いに異なっている。具体的には、第1凹凸領域11aでは凹凸パターン5は、矢印A方向に延びており、第2凹凸領域11bでは凹凸パターン5は、矢印B方向に延びており、第3凹凸領域11cでは凹凸パターン5は、矢印C方向に延びている。矢印B方向は、矢印A方向に直交する方向であり、矢印C方向は、矢印A方向に対して45度ずれた方向である。第1~第3凹凸領域11a~11cでの凹凸パターン5の形状やピッチは、同一であってもよく、異なっていてもよい。
偏光層9は図2に示すように、透明樹脂層7上に形成される。偏光層9は、入射光を偏光させる機能を有するように形成すればよく、その材料、厚さ、形状などは限定されない。偏光層9は、例えば、導電性の金属(Ni,Alなど)又は金属酸化物(ITOなど)で形成することができる。偏光層9は、図2(a)に示すように、凹凸パターン5の形状に沿うように形成してもよく、図2(b)に示すように、凹凸パターン5の凸部7aの上部にのみ形成してもよく、図2(c)に示すように、凹凸パターン5の凸部7aの側面にのみ形成してもよい。つまり、偏光層9は、図2(a)に示すように、膜状に形成してもよく、図2(b)~(c)に示すように細線状に形成してもよい。
次に、偏光板1の製造方法について説明する。本実施形態の偏光板1の製造方法は、被転写樹脂層形成工程、転写及び硬化工程、及び偏光層形成工程を備える。
以下、図3~図4を用いて、各工程について詳細に説明する。
まず、図3(a)に示すように、透明基材3上に光硬化性樹脂組成物を塗布して被転写樹脂層19を形成する。
被転写樹脂層19を構成する光硬化性樹脂組成物は、モノマーと、光開始剤を含有し、活性エネルギー線の照射によって硬化する性質を有する。「活性エネルギー線」は、UV光、可視光、電子線などの、光硬化性樹脂組成物を硬化可能なエネルギー線の総称である。
次に、図3(a)~(b)に示すように、被転写樹脂層19に対して、被転写樹脂層19に転写する凹凸パターン5の反転パターン15を有するモールド13を押し付けた状態で被転写樹脂層19に活性エネルギー線21を照射して被転写樹脂層19を硬化させて透明樹脂層を形成する。
本実施形態の偏光板1の製造に好適に用いられるモールド13の製造方法について説明する。モールド13は、被転写樹脂層の形成とパターンの転写及び硬化工程を複数回繰り返すことによって形成することができる。被転写樹脂層の形成とパターンの転写及び硬化工程の説明は、「偏光板の製造方法」について上述したものと同様であり、説明は、適宜省略する。
まず、図5(a)に示すように、遮光パターン25が形成された透明基材23上に光硬化性樹脂組成物を塗布して被転写樹脂層27を形成する。
次に、図5(a)~(b)に示すように、凹凸パターン5cを有するモールド29を被転写樹脂層27に押し付けた状態で被転写樹脂層27に活性エネルギー線21を照射して被転写樹脂層27を硬化させて、図5(c)に示すように、反転パターン15cを有する透明樹脂層31aを形成する。活性エネルギー線21は、モールド29側から照射して、被転写樹脂層27の全面を硬化させる。
次に、図6(a)に示すように、透明樹脂層31a上に光硬化性樹脂組成物を塗布して被転写樹脂層33を形成する。
次に、図6(a)~(b)に示すように、凹凸パターン5bを有するモールド35を被転写樹脂層33に押し付けた状態で被転写樹脂層33に活性エネルギー線21を照射して被転写樹脂層33を硬化させて、図6(c)に示すように、反転パターン15b,15cを有する透明樹脂層31bを形成する。
次に、図7(a)に示すように、透明樹脂層31b上に光硬化性樹脂組成物を塗布して被転写樹脂層37を形成する。
次に、図7(a)~(b)に示すように、凹凸パターン5aを有するモールド39を被転写樹脂層37に押し付けた状態で被転写樹脂層37に活性エネルギー線21を照射して被転写樹脂層37を硬化させて、図7(c)に示すように、反転パターン15a,15b,15cを有する透明樹脂層31を形成する。
「3.モールドの製造方法」で説明した方法でモールド13を作製した。第1~第3反転パターン領域17a~17cには、同一のラインアンドスペース形状からなる反転パターン15を互いに45度ずつずらして形成した。
作製したモールド13を用いて「2.偏光板の製造方法」で説明した方法で、UVナノインプリントにより転写品を作製した。得られた転写品のSEM像を図8(a)~(b)に示す。図8(a)~(b)に示すように、ラインアンドスペース形状の適切な転写が確認された。図8(a)の断面図において、ラインアンドスペース形状の周期、ライン幅、及び形状高さを測定したところ、それぞれ、117.0nm、33.5nm、142.9nmであった。
直線偏光された偏光を発する偏光光源として、液晶ディスプレイを用意した。偏光光源が無い場合とある場合での面内で回転したときの外観像を観察した。なお、偏光を偏光板1の裏面(凹凸パターン5がない面)から照射した。偏光板1を面内で回転させると、第1~第3凹凸領域11a~11cの外観の変化が観察された。これは、偏光板1の回転により各凹凸領域でのワイヤグリッドパターンの向きの変化に応じて、各凹凸領域での偏光の透過性が変わったためであると考えられる。この結果により、同一面内の任意の位置と向きで偏光子を配置したナノインプリント用モールドとその転写品から作製した偏光板の開発に成功したと考える。
Claims (9)
- 透明基材と、その上に形成され且つ凹凸パターンを有する透明樹脂層と、前記透明樹脂層上に形成された偏光層を備え、
前記透明樹脂層は、前記凹凸パターンが延びる方向が互いに異なる複数の凹凸領域を有する、偏光板。 - 前記複数の凹凸領域は、互いに異なる高さ位置に設けられる、請求項1に記載の偏光板。
- 前記凹凸パターンは、ラインアンドスペース形状である、請求項1又は請求項2に記載の偏光板。
- 前記偏光層は、導電性の金属又は金属酸化物からなる、請求項1~請求項3の何れか1つに記載の偏光板。
- 前記透明樹脂層は、光硬化性樹脂組成物を硬化させて形成される、請求項1~請求項4の何れか1つに記載の偏光板。
- 請求項1~請求項5の何れか1つに記載の偏光板を用いたホログラム機能を有する媒体。
- 透明基材上に光硬化性樹脂組成物を塗布して被転写樹脂層を形成し、
前記被転写樹脂層に対して、前記被転写樹脂層に転写する凹凸パターンの反転パターンを有するモールドを押し付けた状態で前記被転写樹脂層に活性エネルギー線を照射して前記被転写樹脂層を硬化させて透明樹脂層を形成し、
前記透明樹脂層上に導電性の金属又は金属酸化物からなる偏光層を形成する工程を備え、
前記モールドは、前記反転パターンが延びる方向が互いに異なる複数の反転パターン領域を有する、偏光板の製造方法。 - 前記複数の反転パターン領域は、互いに異なる高さ位置に設けられる、請求項7に記載の偏光板の製造方法。
- 前記モールドは、樹脂製モールドである、請求項7又は請求項8に記載の偏光板の製造方法。
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