WO2022260134A1 - 光学用積層体、積層光学フィルム、光学物品、仮想現実表示装置 - Google Patents

光学用積層体、積層光学フィルム、光学物品、仮想現実表示装置 Download PDF

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Publication number
WO2022260134A1
WO2022260134A1 PCT/JP2022/023315 JP2022023315W WO2022260134A1 WO 2022260134 A1 WO2022260134 A1 WO 2022260134A1 JP 2022023315 W JP2022023315 W JP 2022023315W WO 2022260134 A1 WO2022260134 A1 WO 2022260134A1
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Prior art keywords
layer
liquid crystal
reflective
light
laminated
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Ceased
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PCT/JP2022/023315
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English (en)
French (fr)
Japanese (ja)
Inventor
竜二 実藤
雄二郎 矢内
洋平 ▲濱▼地
輝 丸山
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Fujifilm Corp
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Fujifilm Corp
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Priority to CN202280041188.7A priority Critical patent/CN117460976A/zh
Priority to JP2023527923A priority patent/JPWO2022260134A1/ja
Publication of WO2022260134A1 publication Critical patent/WO2022260134A1/ja
Priority to US18/514,471 priority patent/US12345907B2/en
Anticipated expiration legal-status Critical
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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G02B5/3016—Polarising elements involving passive liquid crystal 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
    • G02B5/3033—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid
    • G02B5/3041—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid comprising multiple thin layers, e.g. multilayer stacks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/02—Physical, chemical or physicochemical properties
    • B32B7/023—Optical properties
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/02—Viewing or reading apparatus
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/08—Mirrors
    • G02B5/0816—Multilayer mirrors, i.e. having two or more reflecting layers
    • 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
    • G02F1/133502—Antiglare, refractive index matching layers
    • 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
    • G02F1/13363—Birefringent elements, e.g. for optical compensation
    • G02F1/133635—Multifunctional compensators
    • 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
    • G02F1/13363—Birefringent elements, e.g. for optical compensation
    • G02F1/133638—Waveplates, i.e. plates with a retardation value of lambda/n
    • 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
    • G02F1/137—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 characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering
    • G02F1/13718—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 characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering based on a change of the texture state of a cholesteric liquid crystal
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/40—Properties of the layers or laminate having particular optical properties
    • B32B2307/416—Reflective
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/0018—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 with means for preventing ghost images
    • 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
    • G02F1/133528—Polarisers
    • G02F1/133533—Colour selective polarisers
    • 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
    • G02F1/133528—Polarisers
    • G02F1/133536—Reflective polarizers
    • 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
    • G02F1/133528—Polarisers
    • G02F1/133541—Circular polarisers
    • 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
    • G02F1/133528—Polarisers
    • G02F1/133543—Cholesteric polarisers
    • 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
    • G02F2201/00—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00
    • G02F2201/34—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00 reflector
    • G02F2201/343—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00 reflector cholesteric liquid crystal reflector
    • 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
    • G02F2413/00—Indexing scheme related to G02F1/13363, i.e. to birefringent elements, e.g. for optical compensation, characterised by the number, position, orientation or value of the compensation plates
    • G02F2413/13—Positive birefingence

Definitions

  • the present invention relates to optical laminates, laminated optical films, optical articles, and virtual reality display devices.
  • a reflective polarizer is a polarizer that has the function of reflecting one polarized light of incident light and transmitting the other polarized light.
  • the light reflected by the reflective polarizer and the transmitted light have mutually orthogonal polarization states.
  • the mutually orthogonal polarization states are polarization states located at the antipodal points of each other on the Poincare sphere. correspond to
  • a reflective linear polarizer in which transmitted light and reflected light are linearly polarized is, for example, a film obtained by stretching a dielectric multilayer film as described in Patent Document 1, or a wire grid polarized light as described in Patent Document 2. child is known.
  • a reflective circular polarizer in which transmitted light and reflected light are circularly polarized for example, a film having a light reflecting layer in which a cholesteric liquid crystal phase is fixed, as described in Patent Document 3, is known.
  • a reflective polarizer is used for the purpose of extracting only specific polarized light from incident light or separating incident light into two polarized light.
  • a liquid crystal display device it is used as a brightness enhancement film that enhances light utilization efficiency by reflecting and reusing unnecessary polarized light from a backlight.
  • a liquid crystal projector it is also used as a beam splitter that splits light from a light source into two linearly polarized light beams and supplies each to a liquid crystal panel.
  • Patent Literature 4 discloses an in-vehicle rearview mirror that reflects light from the rear using a reflective polarizer.
  • Patent Document 5 discloses a method of generating a virtual image by reflecting light between a reflective polarizer and a half mirror and reciprocating it in order to reduce the size and thickness of a display unit in a virtual reality display device, an electronic viewfinder, or the like. is disclosed.
  • the conventional reflective polarizers described in Documents 1 and 2 when the reflective polarizer reflects part of the external light and the light from the image display device to generate a virtual image or a real image, the conventional reflective polarizers described in Documents 1 and 2 However, it has been found that the image sharpness may be degraded in some cases. On the other hand, it was found that good image sharpness can be obtained by using a reflective circular polarizer having a light reflecting layer in which a cholesteric liquid crystal phase is fixed. The reason for this is that a reflective circular polarizer with a high degree of polarization can be realized with a thin film by having a light-reflecting layer in which the cholesteric liquid crystal phase is fixed. The inventors believe that this is the reason. Furthermore, according to the studies of the present inventors, virtual reality display devices, electronic viewfinders, etc., use not only reflected light but also transmitted light. is important. In the conventional reflective circular polarizer described in Document 3, ghost suppression was observed and there was room for further improvement.
  • the present invention has been made in view of the above problems, and the problem to be solved by the present invention is to provide an optical system that can be used for a reflective circular polarizer that produces less ghost when used in a virtual reality display device, an electronic viewfinder, or the like. It is another object of the present invention to provide a laminate for optical applications, a laminated optical film comprising the reflective circular polarizer, an optical article comprising the laminate for optical applications, and a virtual reality display device including the optical articles.
  • the laminated reflective layer includes at least one cholesteric liquid crystal layer formed using a first liquid crystal compound substantially composed of a rod-shaped liquid crystal compound, and using a second liquid crystal compound substantially composed of a discotic liquid crystal compound.
  • a reflective layer A that does not include a formed cholesteric liquid crystal layer
  • a cholesteric liquid crystal comprising at least one cholesteric liquid crystal layer formed using the second liquid crystal compound substantially composed of a discotic liquid crystal compound and formed using the first liquid crystal compound substantially composed of a rod-like liquid crystal compound a reflective layer B that does not contain a liquid crystal layer, and Among the two or more laminated reflective layers, when the reflective layers A are opposed to each other in the two laminated reflective layers adjacent in the lamination direction, the The central wavelengths of reflected light from the reflective layers A are different, Among the two or more laminated reflective layers, when the reflective layers B are opposed to each other in the two laminated reflective layers adjacent in the lamination direction, the An optical laminated body in which the center wavelengths of the reflected lights of the reflective layers B are different.
  • the laminated reflective layer is configured by directly contacting one reflective layer A and one reflective layer B, or one reflective layer A and one reflective layer B,
  • [6] comprising a first layer, a second layer, a third layer and a fourth layer in this order; All of the first to fourth layers are cholesteric liquid crystal layers, Each of the first layer to the fourth layer has light reflectivity, The center wavelength of the reflected light from the first layer to the fourth layer is in the range of 430 to 480 nm, 520 to 570 nm, 570 to 620 nm and 620 to 670 nm, respectively; The sign of the retardation in the thickness direction of the first layer at a wavelength of 550 nm and the sign of the retardation in the thickness direction of the second layer at a wavelength of 550 nm are opposite, An optical laminate, wherein the sign of retardation in the film thickness direction of the third layer at a wavelength of 550 nm is opposite to the sign of retardation in the film thickness direction of the fourth layer at a wavelength of 550 nm.
  • One of the first layer and the second layer is a cholesteric liquid crystal layer formed using a rod-like liquid crystal compound, and the other is a cholesteric liquid crystal layer formed using a discotic liquid crystal compound.
  • One of the third layer and the fourth layer is a cholesteric liquid crystal layer formed using a rod-like liquid crystal compound, and the other is a cholesteric liquid crystal layer formed using a discotic liquid crystal compound.
  • One of the first layer and the fourth layer has a center wavelength of the reflected light within the range of 430 to 480 nm, and the other has a center wavelength of the reflected light of 620 to 670 nm.
  • the center wavelength of the reflected light of the second layer is in the range of 520 to 570 nm,
  • the center wavelength of the reflected light of the third layer is in the range of 570 to 620 nm,
  • [10] comprising a first layer, a second layer and a third layer in this order; All of the first to third layers are cholesteric liquid crystal layers,
  • the second layer is a pitch gradient layer in which the helical pitch changes in the film thickness direction,
  • Each of the first layer to the third layer has light reflectivity, the center wavelength of the light reflected from the first layer to the third layer is in the range of 430 to 480 nm, 520 to 620 nm, and 620 to 670 nm, respectively;
  • the sign of the retardation in the thickness direction of the first layer at a wavelength of 550 nm and the sign of the retardation in the thickness direction of the second layer at a wavelength of 550 nm are opposite,
  • An optical laminate wherein the sign of retardation in the thickness direction of the second layer at a wavelength of 550 nm and the sign of the retardation of the third layer in the thickness direction at a wavelength of 550 nm are opposite to each other.
  • the first layer is a cholesteric liquid crystal layer formed using a rod-like liquid crystal compound
  • the second layer is a cholesteric liquid crystal layer formed using a discotic liquid crystal compound
  • the third layer is the layer is a cholesteric liquid crystal layer formed using a rod-like liquid crystal compound
  • the first layer is a cholesteric liquid crystal layer formed using a discotic liquid crystal compound
  • the second layer is a cholesteric liquid crystal layer formed using a rod-like liquid crystal compound
  • the third layer is a discotic liquid crystal layer.
  • the optical laminate according to [10] which is a cholesteric liquid crystal layer formed using a liquid crystal compound.
  • the central wavelength of the reflected light of the first layer is in the range of 430 to 480 nm;
  • the center wavelength of the reflected light of the second layer is in the range of 520 to 620 nm,
  • the optical layered product according to [10] or [11], wherein the center wavelength of light reflected by the third layer is in the range of 620 to 670 nm.
  • a laminated optical film comprising at least a reflective circular polarizer, a retardation layer for converting circularly polarized light into linearly polarized light, and a linear polarizer in this order,
  • a laminated optical film, wherein the reflective circular polarizer is the optical laminate according to any one of [1] to [12].
  • the laminated optical film of [16], wherein the antireflection layer is a moth-eye film or an AR film.
  • An optical article comprising the optical laminate according to any one of [1] to [12].
  • a virtual reality display device comprising the optical article according to [19].
  • an optical laminate that can be used for a reflective circular polarizer that produces little ghost when used in a virtual reality display device, an electronic viewfinder, or the like. Further, according to the present invention, it is possible to provide a laminated optical film including the reflective circular polarizer, an optical article including the optical laminate, and a virtual reality display including the optical article.
  • BRIEF DESCRIPTION OF THE DRAWINGS It is the schematic which shows an example of the laminated body for optics of 1st embodiment of this invention.
  • BRIEF DESCRIPTION OF THE DRAWINGS It is the schematic which shows an example of the laminated body for optics of 1st embodiment of this invention.
  • FIG. 3 is a schematic diagram showing an example of an optical laminate according to the third embodiment of the present invention; It is an example of a virtual reality display device using the laminated optical film of the present invention. It is an example of a virtual reality display device using the laminated optical film of the present invention.
  • BRIEF DESCRIPTION OF THE DRAWINGS It is the schematic which shows an example of the laminated optical film of this invention.
  • perpendicular does not mean exactly 90°, but 90° ⁇ 10°, preferably 90° ⁇ 5°.
  • parallel does not strictly represent 0°, but represents 0° ⁇ 10°, preferably 0° ⁇ 5°.
  • 45° does not mean exactly 45°, but 45° ⁇ 10°, preferably 45° ⁇ 5°.
  • the "absorption axis” means the polarization direction in which the absorbance is maximized in the plane when linearly polarized light is incident.
  • the “reflection axis” means the polarization direction in which the reflectance is maximized in the plane when linearly polarized light is incident.
  • the “transmission axis” means a direction perpendicular to the absorption axis or the reflection axis in the plane.
  • the “slow axis” means the direction in which the refractive index is maximized in the plane.
  • the retardation means in-plane retardation and is represented as Re( ⁇ ), unless otherwise specified.
  • Re( ⁇ ) represents the in-plane retardation at the wavelength ⁇
  • the wavelength ⁇ is 550 nm unless otherwise specified.
  • the retardation in the thickness direction at the wavelength ⁇ is described as Rth( ⁇ ) in this specification.
  • Re( ⁇ ) and Rth( ⁇ ) values measured at wavelength ⁇ using AxoScan OPMF-1 (manufactured by Optoscience) can be used.
  • the optical laminate of the present invention includes a first embodiment, a second embodiment, and a third embodiment.
  • a first embodiment, a second embodiment, and a third embodiment of the optical layered body of the present invention will be described below.
  • the optical laminate of the first embodiment of the present invention has two or more laminated reflective layers,
  • the laminated reflective layer includes at least one cholesteric liquid crystal layer (hereinafter also referred to as "liquid crystal layer 1") formed using a first liquid crystal compound substantially composed of a rod-like liquid crystal compound, and is substantially a disk.
  • liquid crystal layer 1 cholesteric liquid crystal layer
  • a reflective layer A that does not include a cholesteric liquid crystal layer (hereinafter also referred to as “liquid crystal layer 2”) formed using a second liquid crystal compound made of a liquid crystal compound; including at least one liquid crystal layer 2 and a reflective layer B that does not include the liquid crystal layer 1,
  • liquid crystal layer 2 cholesteric liquid crystal layer
  • the central wavelengths of reflected light from the reflective layers A are different
  • the reflective layers B are opposed to each other in the two laminated reflective layers that are adjacent in the lamination direction
  • the central wavelengths of the reflected lights of the reflective layers B are different.
  • FIG. 1 is a schematic cross-sectional view showing an example of the configuration of the optical laminate 10 of the first embodiment.
  • the optical laminate 10 is composed of a first laminated reflective layer 25 and a second laminated reflective layer 26, and the first laminated reflective layer 25 consists of a reflective layer A21a and a reflective layer B22b.
  • the second laminated reflective layer 26 is composed of a reflective layer A 23a and a reflective layer B 24b.
  • the reflective layer A21a, the reflective layer B22b, the reflective layer A23a, and the reflective layer B24b are laminated in this order.
  • the optical laminate of the first embodiment of the present invention can be used in a reflective circular polarizer.
  • the reflective layer A has a positive Rth
  • the reflective layer B has a negative Rth. It is thought that the generation of ghosts can be suppressed even if A first embodiment of the present invention will be described in detail below.
  • the optical laminate of the first embodiment of the present invention has two or more laminated reflective layers each including one reflective layer A and one reflective layer B, which will be described later in detail. That is, the optical layered body of the first embodiment of the present invention includes two or more reflective layers A and two or more reflective layers B, respectively.
  • the reflective layer A and the reflective layer B may be in direct contact with each other, or the reflective layer A and the reflective layer B may be laminated via another layer.
  • other layers include, but are not limited to, adhesion layers (eg, adhesive layers, adhesive layers, etc.), refractive index adjusting layers, resin films, positive C plates, orientation layers, and the like.
  • the laminated reflective layer may be configured such that one reflective layer A and one reflective layer B are in direct contact with one reflective layer A, one reflective layer B, the reflective layer A and the reflective layer B. and an adhesion layer disposed between.
  • the laminated reflective layer is preferably configured such that one reflective layer A and one reflective layer B are in direct contact with each other.
  • the laminated reflective layer may be laminated such that the reflective layer A and the reflective layer B are alternately arranged in the optical laminated body, or may be laminated so that the reflective layers A face each other.
  • the reflective layers B may be laminated so as to face each other.
  • the reflective layer A, the reflective layer B, the reflective layer A and the reflective layer B may be laminated in this order.
  • reflective layer B, reflective layer B, and reflective layer A may be laminated in this order, or reflective layer B, reflective layer A, reflective layer A, and reflective layer B may be laminated in this order.
  • the center wavelengths of the reflected light of the reflective layers A included in the two adjacent laminated reflective layers are different, and among the two or more laminated reflective layers, the two adjacent in the lamination direction
  • the reflective layers B face each other for example, when the reflective layer A, the reflective layer B, the reflective layer B, and the reflective layer A are laminated in this order
  • two adjacent reflective layers The center wavelengths of the reflected lights of the reflective layers B included in the two laminated reflective layers are different.
  • the optical laminate 11 shown in FIG. 2 is composed of a first laminated reflective layer 25 and a second laminated reflective layer 26.
  • the first laminated reflective layer 25 is composed of a reflective layer B21b and a reflective layer A22a.
  • the two-laminate reflective layer 26 is composed of a reflective layer A23a and a reflective layer B24b.
  • the reflective layer B21b, the reflective layer A22a, the reflective layer A23a, and the reflective layer B24b are laminated in this order.
  • the central wavelength of the reflected light from the reflective layer A22a is different from the central wavelength of the reflected light from the reflective layer A23a.
  • the reflective layer A22a is included in the first laminated reflective layer 25, and the reflective layer A23a is included in the second laminated reflective layer .
  • the reflective layer A may include two or more liquid crystal layers 1 having different central wavelengths of reflected light. When they are arranged continuously, the reflective layer A and the laminated reflective layer are arranged so that the number of laminated reflective layers is maximized.
  • the reflective layer B may include two or more liquid crystal layers 2 having different central wavelengths of reflected light.
  • the reflective layer B and the laminated reflective layers are taken so as to maximize the number of laminated reflective layers.
  • the mode of lamination of the laminated reflective layer is preferably a mode in which the reflective layer A and the reflective layer B are laminated so as to be alternately arranged. That is, it is preferable that the reflective layer A and the reflective layer B are alternately arranged in the thickness direction of the optical laminate.
  • the optical laminate of the first embodiment contains two or more laminated reflective layers, but may contain three or more laminated reflective layers, or four or more laminated reflective layers. That is, the optical laminate includes two or more of each of the reflective layers A and B, but may include three or more of each of the reflective layers A and B, or four or more of each.
  • the total number of laminated reflective layers included in the optical laminate is preferably 30 layers or less, more preferably 20 layers or less, and even more preferably 10 layers or less. That is, the total number of layers of the reflective layer A and the reflective layer B of the optical laminate is preferably 60 layers or less, preferably 40 layers or less, and more preferably 20 layers or less.
  • the thickness of the laminated reflective layer is preferably 0.2 ⁇ m or more, more preferably 0.4 ⁇ m or more, and even more preferably 0.6 ⁇ m or more. Moreover, the thickness of the laminated reflective layer is preferably 20.0 ⁇ m or less, more preferably 14.0 ⁇ m or less, and even more preferably 10.0 ⁇ m or less. The thickness of the laminated reflective layer can be measured by the same method as for the reflective layers A and B described below.
  • the reflective layer A and the reflective layer B will be described below.
  • the laminated reflective layer included in the optical laminate of the first embodiment of the present invention includes at least one liquid crystal layer 1 and a reflective layer A that does not include the liquid crystal layer 2 .
  • the liquid crystal layer 1 is a cholesteric liquid crystal layer formed using a first liquid crystal compound substantially composed of a rod-like liquid crystal compound, and substantially composed of a rod-like liquid crystal compound.
  • a cholesteric liquid crystal layer formed using a first liquid crystal compound substantially composed of a rod-shaped liquid crystal compound means that the first liquid crystal compound is a cholesteric liquid crystal phase, and the alignment state of the cholesteric liquid crystal phase is fixed. refers to layers.
  • the phrase “substantially composed of a rod-shaped liquid crystal compound” means that the rod-shaped liquid crystal compound accounts for 95% by mass or more of the liquid crystal compound (first liquid crystal compound) included in the liquid crystal layer 1 .
  • the first liquid crystal compound consisting essentially of a rod-like liquid crystal compound means that the content of the rod-like liquid crystal compound is 95% by mass or more with respect to the total mass of the first liquid crystal compound.
  • the first liquid crystal compound consists only of a rod-like liquid crystal compound.
  • the liquid crystal layer 2 is a cholesteric liquid crystal layer formed using a second liquid crystal compound substantially composed of a discotic liquid crystal compound, and is substantially composed of a discotic liquid crystal compound.
  • a cholesteric liquid crystal layer formed using a second liquid crystal compound substantially composed of a discotic liquid crystal compound means that the second liquid crystal compound is a cholesteric liquid crystal phase, and the alignment state of the cholesteric liquid crystal phase is fixed. refers to layers.
  • substantially composed of a discotic liquid crystal compound means that the liquid crystal compound (second liquid crystal compound) contained in the liquid crystal layer 2 is 95 mass % or more of the discotic liquid crystal compound.
  • the second liquid crystal compound substantially composed of a discotic liquid crystal compound means that the content of the discotic liquid crystal compound is 95% by mass or more with respect to the total mass of the second liquid crystal compound. .
  • the second liquid crystal compound consists only of a discotic liquid crystal compound.
  • the reflective layer A may include one or more layers of the liquid crystal layer 1, and may include two or more layers.
  • layers other than the liquid crystal layer 2 may or may not be included between the two or more liquid crystal layers 1 .
  • other layers include, but are not limited to, adhesion layers (eg, adhesive layers, adhesive layers, etc.), refractive index adjusting layers, resin films, positive C plates, and alignment layers.
  • the number of layers of the liquid crystal layer 1 included in the reflective layer A is preferably 5 layers or less, more preferably 3 layers or less, and even more preferably 2 layers or less. It is also preferable that the number of layers of the liquid crystal layer 1 included in the reflective layer A is one.
  • liquid crystal layers 1 when two liquid crystal layers 1 have different central wavelengths of reflected light, they are regarded as two liquid crystal layers 1 . If the central wavelengths of the reflected light from two or more liquid crystal layers 1 are the same, the liquid crystal layer 1 can be formed as one layer even if the liquid crystal layers 1 are formed by successive coating or are separated by other layers. Consider layer 1.
  • the central wavelength of the reflected light of the reflective layer A is the central wavelength of the reflected light of the reflective layer A as a whole.
  • a method for measuring the center wavelength of the reflected light will be described later.
  • the thickness of the reflective layer A is preferably 0.1 ⁇ m or more, more preferably 0.2 ⁇ m or more, and even more preferably 0.3 ⁇ m or more.
  • the thickness of the reflective layer A is preferably 10.0 ⁇ m or less, more preferably 7.0 ⁇ m or less, and even more preferably 5.0 ⁇ m or less, in order to further suppress ghosting.
  • the thickness of the reflective layer A can be measured by preparing a cross section of the optical laminate and observing it with a scanning electron microscope.
  • the thickness of the reflective layer A is a value obtained by averaging the thickness of the reflective layer A at arbitrary five points in the cross section of the optical laminate.
  • the area of the reflective layer A and the area of the reflective layer B which will be described later, can be distinguished from each other by the difference in the contrast of the photographed images. Also, by using composition analysis in the film thickness direction by time-of-flight-secondary ion mass spectrometry (TOF-SIMS), the region between the reflective layer A and the reflective layer B can be distinguished.
  • TOF-SIMS time-of-flight-secondary ion mass spectrometry
  • Rth of the reflective layer A is preferably 8 to 800 nm, more preferably 16 to 560 nm, and even more preferably 24 to 400 nm at a wavelength of 550 nm.
  • the Rth of the reflective layer A may be measured by taking out only the reflective layer A from the optical laminate, or by measuring the Rth of a layer produced under the same conditions as in producing the reflective layer A. good.
  • the rod-shaped liquid crystal compound contained in the liquid crystal layer 1 is not particularly limited, and known rod-shaped liquid crystal compounds can be used.
  • the liquid crystal layer 1 may be a layer in which the orientation of the rod-like liquid crystal compound in the cholesteric liquid crystal phase is maintained. After aligning the cholesteric liquid crystal phase by a method such as addition, it is polymerized and cured by ultraviolet irradiation, heating, or the like to form a layer having no fluidity.
  • the liquid crystal layer 1 formed as described above may be a layer that is changed into a state in which the orientation is not changed by an external field, an external force, or the like.
  • the rod-like liquid crystal compound in the liquid crystal layer 1 may no longer exhibit liquid crystallinity.
  • the polymerizable rod-like liquid crystal compound may be polymerized by a curing reaction and no longer have liquid crystallinity.
  • the center wavelength of the reflected light from the liquid crystal layer 1 can be obtained as follows.
  • a spectrum having a peak where the transmittance decreases is obtained in the region near the center wavelength of the reflected light. be done.
  • the wavelength on the short wavelength side is ⁇ l (nm)
  • the wavelength on the long wavelength side is ⁇ h ( nm)
  • the pitch of the cholesteric liquid crystal phase changes depending on the type of chiral agent used together with the polymerizable rod-like liquid crystal compound and its additive concentration, and the desired pitch of the cholesteric liquid crystal phase can be obtained by adjusting one or more of the above.
  • the spiral direction and pitch measurement method see “Introduction to Liquid Crystal Chemistry Experiments” edited by the Japanese Liquid Crystal Society, published by Sigma Publishing in 2007, p. method can be used.
  • the laminated reflective layer included in the optical laminate of the first embodiment of the present invention includes at least one liquid crystal layer 2 and a reflective layer B that does not include the liquid crystal layer 1 .
  • the definitions of the liquid crystal layer 2 and the liquid crystal layer 1 are as described above.
  • the reflective layer B may include one or more layers of the liquid crystal layer 2, and may include two or more layers.
  • layers other than the liquid crystal layer 1 may or may not be included between the two or more liquid crystal layers 2 .
  • other layers include, but are not limited to, adhesion layers (eg, adhesive layers, adhesive layers, etc.), refractive index adjusting layers, resin films, positive C plates, and alignment layers.
  • the number of layers of the liquid crystal layer 2 included in the reflective layer B is preferably 5 layers or less, more preferably 3 layers or less, and even more preferably 2 layers or less. It is also preferable that the number of layers of the liquid crystal layer 2 included in the reflective layer B is one.
  • liquid crystal layers 2 when two liquid crystal layers 2 have different central wavelengths of reflected light, they are regarded as two liquid crystal layers 2 . If the center wavelengths of the reflected light from two or more liquid crystal layers 2 are the same, the liquid crystal layer 2 can be formed as one liquid crystal layer, for example, even if the liquid crystal layers 2 are formed by successive coating or are separated by the above-mentioned other layers.
  • layer 2 If layer 2.
  • the central wavelength of the reflected light of the reflective layer B is the central wavelength of the reflected light of the reflective layer B as a whole.
  • the central wavelength of the reflected light from each liquid crystal layer 2 is measured according to the method for measuring the central wavelength of the reflected light from the liquid crystal layer 1 described above.
  • the thickness of the reflective layer B is preferably 0.1 ⁇ m or more, more preferably 0.2 ⁇ m or more, and even more preferably 0.3 ⁇ m or more.
  • the thickness of the reflective layer B is preferably 10.0 ⁇ m or less, more preferably 7.0 ⁇ m or less, and even more preferably 5.0 ⁇ m or less, in order to further suppress ghosting.
  • the thickness of the reflective layer B can be measured by preparing a cross section of the optical laminate and observing it with a transmission electron microscope.
  • Rth of the reflective layer B is preferably ⁇ 8 to ⁇ 800 nm, more preferably ⁇ 16 to ⁇ 560 nm, and even more preferably ⁇ 24 to ⁇ 400 nm at a wavelength of 550 nm.
  • the Rth of the reflective layer B may be measured by taking out only the reflective layer B from the optical laminate, or by measuring the Rth of a layer produced under the same conditions as in producing the reflective layer B. good.
  • the discotic liquid crystal compound contained in the liquid crystal layer 2 is not particularly limited, and known discotic liquid crystal compounds can be used.
  • the liquid crystal layer 2 may be any layer as long as the orientation of the discotic liquid crystal compound in the cholesteric liquid crystal phase is maintained. After aligning the cholesteric liquid crystal phase by adding an agent or the like, it is polymerized and cured by ultraviolet irradiation, heating, or the like to form a layer having no fluidity.
  • the liquid crystal layer 2 formed as described above may be a layer that is changed into a state in which the orientation state is not changed by an external field, an external force, or the like.
  • the optical properties of the cholesteric liquid crystal phase are maintained in the layer, and the discotic liquid crystal compound in the liquid crystal layer 2 may no longer exhibit liquid crystallinity.
  • the polymerizable discotic liquid crystal compound may be polymerized by a curing reaction and no longer have liquid crystallinity.
  • the central wavelength ⁇ of the reflected light from the liquid crystal layer 2 depends on the pitch of the helical structure in the cholesteric liquid crystal phase, can be defined in the same manner as in the case of the liquid crystal layer 1, and can be measured by the same method.
  • the pitch of the cholesteric liquid crystal phase varies depending on the type of chiral agent used together with the polymerizable discotic liquid crystal compound and its additive concentration, and the desired pitch of the cholesteric liquid crystal phase can be obtained by adjusting one or more of the above.
  • the above-mentioned literature can be referred to.
  • the optical laminate of the first embodiment of the present invention preferably has a reflectance of 40% or more and less than 50% for light having a wavelength of 400 to 700 nm.
  • the reflectance is 40% or more, it is easier to suppress ghosts.
  • the light with a wavelength of 400 to 700 nm refers to non-polarized light.
  • the reflectance of light having a wavelength of 400 to 700 nm of the optical laminate was measured under the following conditions.
  • An automatic absolute reflectance measurement system consisting of a UV-visible-near-infrared spectrophotometer V-750 manufactured by JASCO Corporation is used. Polarized S and P waves with wavelengths of 350 to 900 nm are incident on the optical laminate at an incident angle of 5°.
  • a reflectance spectrum is obtained by measuring the absolute reflectance for each of the S wave and the P wave and calculating the average value for each wavelength. From the obtained reflectance spectrum, the average reflectance for light with a wavelength of 400 to 700 nm is calculated, and this is taken as the reflectance for light with a wavelength of 400 to 700 nm of the optical laminate.
  • the optical laminate of the first embodiment of the present invention includes the reflective layer A and the reflective layer B, and at least a blue light reflective layer having a reflectance of 40% or more at a wavelength of 460 nm and It preferably includes a green light reflective layer with a reflectance of 40% or more, a yellow light reflective layer with a reflectance of 40% or more at a wavelength of 600 nm, and a red light reflective layer with a reflectance of 40% or more at a wavelength of 650 nm.
  • the blue light reflecting layer, the green light reflecting layer, the yellow light reflecting layer, and the red light reflecting layer may correspond to any one of the reflecting layer A and the reflecting layer B, respectively.
  • the central wavelength of the reflected light of the reflective layer A may be adjusted to about 460 nm by the method described above.
  • the central wavelength of the reflected light of the reflective layer B may be adjusted by the method described above to set the central wavelength of the reflected light to about 460 nm.
  • the above reflectance is the reflectance when non-polarized light is incident on the reflective layer at each wavelength.
  • the optical laminate may have two or more blue light reflective layers. It may have a green light reflecting layer, may have two or more yellow light reflecting layers, and may have two or more red light reflecting layers.
  • the center wavelength of the light reflected by the blue light reflecting layer is preferably in the range of 430 to 480 nm.
  • the center wavelength of the light reflected by the green light reflecting layer is preferably in the range of 520 to 570 nm.
  • the center wavelength of the light reflected by the yellow light reflecting layer is preferably in the range of 570 to 620 nm.
  • the central wavelength of the light reflected by the red light reflecting layer is preferably in the range of 620 to 670 nm.
  • the method for measuring the center wavelength of reflected light is as described above.
  • the reflective layer A and the The center wavelength of the light reflected by the reflective layer B may be adjusted.
  • the optical layered body is formed by laminating the blue light reflecting layer, the green light reflecting layer, the yellow light reflecting layer, and the red light reflecting layer in this order.
  • the reflective layer on the long wavelength side for example, the red light reflective layer
  • the required thickness of the reflective layer increases, and the influence of the Rth of the reflective layer itself on the light transmitted through the reflective layer increases. blue light reflective layer).
  • the reflective layer A has a positive Rth
  • the reflective layer B has a negative Rth, so that the Rths cancel each other.
  • SRth i be the sum of the Rth of each layer from L 1 to the reflective layer L i (i is an integer equal to or less than n).
  • SRth i is represented as follows.
  • the absolute values of all SRth i are preferably 0.3 ⁇ m or less, more preferably 0.2 ⁇ m or less, and even more preferably 0.1 ⁇ m or less.
  • Rth i of each layer in the above formula is determined by the formula for calculating Rth described above.
  • the orientation direction (slow It is preferable to dispose so that the phase axis direction) changes continuously at the interface.
  • a coating liquid containing a rod-shaped liquid crystal compound is directly applied onto the reflective layer B, and the discotic liquid crystal compound contained in the reflective layer B is coated directly on the reflective layer B. It is also possible to orient the slow axis direction so that it is continuous at the interface by the orientation regulating force of .
  • the thickness of the optical laminate of the first embodiment of the present invention is preferably 30 ⁇ m or less, more preferably 15 ⁇ m or less.
  • the lower limit is not particularly limited, it may be, for example, 1 ⁇ m or more, preferably 5 ⁇ m or more.
  • the optical laminate of the second embodiment of the present invention comprises a first layer, a second layer, a third layer and a fourth layer in this order, All of the first to fourth layers are cholesteric liquid crystal layers, Each of the first layer to the fourth layer has light reflectivity, The center wavelength of the reflected light from the first layer to the fourth layer is in the range of 430 to 480 nm, 520 to 570 nm, 570 to 620 nm, and 620 to 670 nm, respectively; The sign of Rth at a wavelength of 550 nm of the first layer and the sign of Rth at a wavelength of 550 nm of the second layer are opposite, The sign of Rth at a wavelength of 550 nm in the third layer is opposite to the sign of Rth in the fourth layer at a wavelength of 550 nm.
  • FIG. 3 is a schematic cross-sectional view showing an example of the configuration of the optical laminate 12 of the second embodiment.
  • the optical laminate 12 includes a first layer 31, a second layer 32, a third layer 33, and a fourth layer 34, which are laminated in this order.
  • the sign of Rth of the first layer 31 and the sign of Rth of the second layer 32 are opposite, and the sign of Rth of the third layer 33 and the sign of Rth of the fourth layer 34 are opposite. is the opposite.
  • the optical laminate of the second embodiment of the invention can be used in a reflective circular polarizer.
  • the optical laminate has the above structure, the Rth of the first layer and the Rth of the second layer offset each other, and the Rth of the third layer and the Rth of the fourth layer offset each other. Since it is canceled, it is thought that the occurrence of ghost can be suppressed even for incident light from an oblique direction.
  • the second embodiment of the present invention will now be described in detail.
  • the optical laminate of the second embodiment of the present invention comprises a first layer, a second layer, a third layer and a fourth layer in this order.
  • the first to fourth layers are light reflective cholesteric liquid crystal layers.
  • the cholesteric liquid crystal layer is a layer formed by fixing a liquid crystal compound to a cholesteric liquid crystal phase.
  • a known cholesteric liquid crystal layer can be used, and for example, one described in JP-A-2020-060627 can be used.
  • the cholesteric liquid crystal layer is preferably a cholesteric liquid crystal layer formed using a rod-like liquid crystal compound or a cholesteric liquid crystal layer formed using a discotic liquid crystal compound.
  • a cholesteric liquid crystal layer formed using a rod-like liquid crystal compound tends to have a positive Rth value
  • a cholesteric liquid crystal layer formed using a discotic liquid crystal compound tends to have a negative Rth value.
  • the central wavelengths of reflected light from the first layer to the fourth layer are within the ranges of 430 to 480 nm, 520 to 570 nm, 570 to 620 nm, and 620 to 670 nm, respectively. It is also preferable that the central wavelengths of the reflected light from the first layer to the fourth layer are different from each other.
  • the layer can correspond to the blue light reflecting layer described in the first embodiment. In this case, the reflectance at the center wavelength of the reflected light is preferably 40% or more and less than 50%.
  • the central wavelength of the reflected light is 520-570 nm
  • the layer can correspond to the green light reflecting layer described in the first embodiment.
  • the reflectance at the center wavelength of the reflected light is preferably 40% or more and less than 50%.
  • the layer can correspond to the yellow light reflecting layer described in the first embodiment.
  • the reflectance at the center wavelength of the reflected light is preferably 40% or more and less than 50%.
  • the layer can correspond to the red light reflecting layer described in the first embodiment.
  • the reflectance at the center wavelength of the reflected light is preferably 40% or more and less than 50%.
  • the reflectance measurement method is as described above.
  • the center wavelength of the reflected light from the first to fourth layers may be within any of the above wavelength ranges. It is preferable that the central wavelength of the reflected light is in the range of 430-480 nm and the central wavelength of the other reflected light is in the range of 620-670 nm. Further, the center wavelength of the reflected light of the first layer is within the range of 430 to 480 nm, the center wavelength of the reflected light of the second layer is within the range of 520 to 570 nm, and the center wavelength of the reflected light of the third layer is within the range of 430 to 480 nm.
  • the central wavelength is in the range of 570-620 nm and the central wavelength of the reflected light of the fourth layer is in the range of 620-670 nm. That is, the first layer corresponds to the blue light reflecting layer, the second layer corresponds to the green light reflecting layer, the third layer corresponds to the yellow light reflecting layer, and the fourth layer corresponds to the red light reflecting layer. It is also preferable to correspond to each. Further, in the case where the optical laminate having the layering order as described above is applied to a reflective circular polarizer, which will be described later, the reflective layer on the long wavelength side (for example, the red light reflective layer) is required to obtain a sufficient reflectance. The required thickness of the reflective layer increases, and the influence of the Rth of the reflective layer itself on the light transmitted through the reflective layer increases. blue light reflective layer).
  • the sign of Rth at a wavelength of 550 nm in the first layer is opposite to the sign of Rth at a wavelength of 550 nm in the second layer
  • the wavelength of the third layer is The sign of Rth at 550 nm and the sign of Rth at wavelength 550 nm of the fourth layer are opposite.
  • the method of reversing the sign of Rth between the first layer and the second layer as described above is not particularly limited, but as an aspect of such a relationship of Rth, for example, the first layer and the second layer
  • One of the layers is a cholesteric liquid crystal layer formed using a rod-like liquid crystal compound, and the other is a cholesteric liquid crystal layer formed using a discotic liquid crystal compound.
  • the method of reversing the sign of Rth between the third layer and the fourth layer as described above is not particularly limited, but as an aspect of such a relationship of Rth, for example, the third layer and One of the fourth layers is a cholesteric liquid crystal layer formed using a rod-like liquid crystal compound, and the other is a cholesteric liquid crystal layer formed using a discotic liquid crystal compound. Further, it is also preferable that the sign of Rth is opposite between the second layer and the third layer. As an aspect of such a relationship of Rth, for example, the first layer and the third layer are cholesteric liquid crystal layers formed using a rod-like liquid crystal compound, and the second layer and the fourth layer are disk-shaped.
  • the thickness of each of the first to fourth layers is preferably 0.1 ⁇ m or more, more preferably 0.2 ⁇ m or more, and still more preferably 0.3 ⁇ m or more.
  • the thickness of each of the first to fourth layers is preferably 10.0 ⁇ m or less, more preferably 7.0 ⁇ m or less, and even more preferably 5.0 ⁇ m or less, in terms of further suppressing ghosting.
  • the thicknesses of the first to fourth layers can be measured by preparing a cross section of the optical laminate and observing it with a transmission electron microscope.
  • the absolute values of SRth i described in the optical layered body of the first embodiment are within the ranges described above.
  • n is read as 4.
  • the absolute value of SRth i is preferably 0.3 ⁇ m or less, more preferably 0.2 ⁇ m or less, and even more preferably 0.1 ⁇ m or less.
  • the first to fourth layers may be laminated in direct contact with each other, or may be laminated via other layers.
  • other layers include, but are not limited to, adhesion layers (eg, adhesive layers, adhesive layers, etc.), refractive index adjusting layers, resin films, positive C plates, and alignment layers.
  • adhesion layers eg, adhesive layers, adhesive layers, etc.
  • refractive index adjusting layers e.g., refractive index adjusting layers
  • resin films e.g., positive C plates, and alignment layers.
  • the first to fourth layers are preferably laminated in direct contact with each other.
  • a liquid crystal compound ( It is preferable to dispose so that the orientation direction (slow axis direction) of the rod-like liquid crystal compound or discotic liquid crystal compound) changes continuously at the interface.
  • a second layer of a cholesteric liquid crystal layer formed using a rod-like liquid crystal compound is formed on a first layer that is a cholesteric liquid crystal layer formed using a discotic liquid crystal compound.
  • a coating solution containing a rod-shaped liquid crystal compound is directly applied onto the first layer, and the orientation control force of the discotic liquid crystal compound contained in the first layer is applied so that the slow axis direction is continuous at the interface. It can also be oriented.
  • the thickness of the optical laminate of the second embodiment of the present invention is preferably 30 ⁇ m or less, more preferably 15 ⁇ m or less.
  • the lower limit is not particularly limited, it may be, for example, 1 ⁇ m or more, preferably 5 ⁇ m or more.
  • the optical laminate of the third embodiment of the present invention comprises a first layer, a second layer and a third layer in this order, All of the first to third layers are cholesteric liquid crystal layers,
  • the second layer is a pitch gradient layer in which the helical pitch changes in the film thickness direction,
  • Each of the first layer to the third layer has light reflectivity, the center wavelength of the light reflected from the first layer to the third layer is in the range of 430 to 480 nm, 520 to 620 nm, and 620 to 670 nm, respectively;
  • the sign of the retardation in the thickness direction of the first layer at a wavelength of 550 nm and the sign of the retardation in the thickness direction of the second layer at a wavelength of 550 nm are opposite,
  • the sign of the retardation in the film thickness direction at a wavelength of 550 nm of the second layer is opposite to the sign of the retardation in the film thickness direction of the third layer at a wavelength of 550 nm.
  • FIG. 4 is a schematic cross-sectional view showing an example of the configuration of the optical laminate 13 of the third embodiment.
  • the optical layered body 13 has a first layer 27, a second layer 28, and a third layer 29 laminated in this order, each of which satisfies the requirements described above.
  • the sign of Rth of the first layer 27 and the sign of Rth of the second layer 28 are opposite, and the sign of Rth of the second layer 28 and the sign of Rth of the third layer 29 are opposite. is the opposite.
  • the optical laminate of the third embodiment of the present invention can be used in a reflective circular polarizer.
  • the optical laminate has the above structure, the Rth of the first layer and the Rth of the second layer cancel each other, and the Rth of the second layer and the Rth of the third layer offset each other. Since it is canceled, it is considered possible to suppress the generation of a ghost even for incident light from an oblique direction.
  • the third embodiment of the present invention will now be described in detail.
  • the optical laminate of the third embodiment of the present invention comprises a first layer, a second layer and a third layer in this order.
  • the first to third layers are light reflective cholesteric liquid crystal layers.
  • the cholesteric liquid crystal layer is a layer formed by fixing a liquid crystal compound to a cholesteric liquid crystal phase.
  • the cholesteric liquid crystal layers used in the first to fourth layers of the second embodiment can be used.
  • the cholesteric liquid crystal layer is preferably a cholesteric liquid crystal layer formed using a rod-like liquid crystal compound or a cholesteric liquid crystal layer formed using a discotic liquid crystal compound.
  • a cholesteric liquid crystal layer formed using a rod-like liquid crystal compound tends to have a positive Rth value
  • a cholesteric liquid crystal layer formed using a discotic liquid crystal compound tends to have a negative Rth value.
  • the second layer is a pitch gradient layer in which the helical pitch changes in the film thickness direction.
  • the pitch gradient layer can be produced by a known method, for example, with reference to JP-A-2020-060627.
  • the pitch gradient layer since the helical pitch changes in the film thickness direction, light in a plurality of wavelength ranges can be reflected.
  • the center wavelengths of the reflected light from the first layer to the third layer are within the ranges of 430 to 480 nm, 520 to 620 nm, and 620 to 670 nm, respectively. It is also preferable that the central wavelengths of the reflected light from the first layer to the third layer are different from each other.
  • the layer can correspond to the blue light reflecting layer described in the first embodiment.
  • the reflectance at the center wavelength of the reflected light is preferably 40% or more and less than 50%.
  • the layer can correspond to the green light reflecting layer or the yellow light reflecting layer described in the first embodiment.
  • the reflectance at the center wavelength of the reflected light is preferably 40% or more and less than 50%.
  • the layer can correspond to the red light reflecting layer described in the first embodiment.
  • the reflectance at the center wavelength of the reflected light is preferably 40% or more and less than 50%.
  • the reflectance measurement method is as described above.
  • the central wavelength of the reflected light from the first layer to the third layer may be within any of the above wavelength ranges, but the central wavelength of the reflected light from the first layer is in the range of 430 to 480 nm.
  • the center wavelength of the reflected light of the other layer is within the range of 620 to 670 nm
  • the center wavelength of the reflected light of the second layer is within the range of 520 to 620 nm
  • the center wavelength of the reflected light of the third layer is within the range of 520 to 620 nm. It is also preferred that the center wavelength is within the range of 620-670 nm.
  • the first layer corresponds to the blue light reflecting layer
  • the second layer corresponds to the green light reflecting layer and the yellow light reflecting layer
  • the third layer corresponds to the red light reflecting layer. Since the second layer is a pitch gradient layer, a single layer can exhibit the functions of the green light reflecting layer and the yellow light reflecting layer.
  • the reflective layer on the long wavelength side for example, the red light reflective layer
  • the reflective layer on the long wavelength side is required to obtain a sufficient reflectance.
  • the required thickness of the reflective layer increases, and the Rth of the reflective layer itself has a greater effect on the light transmitted through the reflective layer. blue light reflective layer).
  • the sign of Rth at a wavelength of 550 nm in the first layer is opposite to the sign of Rth at a wavelength of 550 nm in the second layer
  • the wavelength of the second layer is
  • the sign of Rth at 550 nm and the sign of Rth at the wavelength of 550 nm of the third layer are opposite.
  • the method of reversing the sign of Rth between the first layer and the second layer and reversing the sign of Rth between the second layer and the third layer as described above is not particularly limited.
  • the first layer is a cholesteric liquid crystal layer formed using a rod-like liquid crystal compound
  • the second layer is a cholesteric liquid crystal layer formed using a discotic liquid crystal compound
  • the third layer is a cholesteric liquid crystal layer formed using a rod-like liquid crystal compound.
  • the first layer is a cholesteric liquid crystal layer formed using a discotic liquid crystal compound
  • the second layer is formed using a rod-like liquid crystal compound.
  • it is a cholesteric liquid crystal layer
  • the third layer is a cholesteric liquid crystal layer formed using a discotic liquid crystal compound.
  • the absolute values of SRth i described in the optical layered body of the first embodiment are within the ranges described above.
  • n is read as 3.
  • the absolute value of SRth i is preferably 0.3 ⁇ m or less, more preferably 0.2 ⁇ m or less, and even more preferably 0.1 ⁇ m or less.
  • the first to third layers may be laminated in direct contact with each other, or may be laminated via other layers.
  • other layers include, but are not limited to, adhesion layers (eg, adhesive layers, adhesive layers, etc.), refractive index adjusting layers, resin films, positive C plates, and alignment layers.
  • adhesion layers eg, adhesive layers, adhesive layers, etc.
  • refractive index adjusting layers e.g., refractive index adjusting layers
  • resin films e.g., positive C plates, and alignment layers.
  • the first to third layers are preferably laminated in direct contact with each other.
  • a liquid crystal compound ( It is preferable to dispose so that the orientation direction (slow axis direction) of the rod-like liquid crystal compound or discotic liquid crystal compound) changes continuously at the interface.
  • a second layer of a cholesteric liquid crystal layer formed using a rod-like liquid crystal compound is formed on a first layer that is a cholesteric liquid crystal layer formed using a discotic liquid crystal compound.
  • a coating solution containing a rod-shaped liquid crystal compound is directly applied onto the first layer, and the orientation control force of the discotic liquid crystal compound contained in the first layer is applied so that the slow axis direction is continuous at the interface. It can also be oriented.
  • the thickness of the optical laminate of the third embodiment of the present invention is preferably 30 ⁇ m or less, more preferably 15 ⁇ m or less.
  • the lower limit is not particularly limited, it is, for example, 1 ⁇ m or more, preferably 5 ⁇ m or more.
  • optical laminate of the present invention (first embodiment, second embodiment and third embodiment) can be produced by a known method, and the method is not particularly limited.
  • a composition containing a rod-like liquid crystal compound is applied on a substrate to form a cholesteric liquid crystal phase, and then the alignment state of the cholesteric liquid crystal phase is obtained.
  • a composition containing a discotic liquid crystal compound is applied on the first cholesteric liquid crystal layer to form a cholesteric liquid crystal phase, and then the alignment state of the cholesteric liquid crystal phase is fixed.
  • the first cholesteric liquid crystal layer and the third cholesteric liquid crystal layer correspond to the reflective layer A of the first embodiment
  • the second cholesteric liquid crystal layer and the fourth cholesteric liquid crystal layer correspond to the first embodiment.
  • the first to fourth cholesteric liquid crystal layers correspond to the first to fourth layers of the second embodiment, respectively.
  • the first cholesteric liquid crystal layer is formed on the base material in the same manner as described above, and then the first cholesteric liquid crystal layer is formed on the first cholesteric liquid crystal layer with reference to the above method.
  • a method of forming a second cholesteric liquid crystal layer (pitch gradient layer) and forming a third cholesteric liquid crystal layer on the second cholesteric liquid crystal layer in the same manner as the first cholesteric liquid crystal layer can be mentioned.
  • the first to third cholesteric liquid crystal layers correspond to the first to third layers of the second embodiment, respectively.
  • the optical laminate of the present invention when used as a reflective circular polarizer, when the reflective circular polarizer is stretched or molded, the reflection wavelength range of the reflective circular polarizer shifts to the short wave side. Therefore, it is preferable to manufacture the optical laminated body with the shift of the wavelength in the reflection wavelength range taken into consideration in advance.
  • the optical layered body including a layer formed by fixing a cholesteric liquid crystal phase when used as a reflective circular polarizer, the optical layered body is elongated by stretching or molding, and the helical pitch of the cholesteric liquid crystal phase becomes smaller. Therefore, it is preferable to set the helical pitch of the cholesteric liquid crystal phase large in advance.
  • the optical layered product preferably has an infrared light reflecting layer having a reflectance of 40% or more at a wavelength of 800 nm.
  • an appropriate reflection wavelength range is selected according to the wavelength shift due to stretching at each place in the plane of the optical laminate. may be manufactured. That is, there may be regions having different reflection wavelength ranges in the plane of the optical laminate.
  • a method of forming a cholesteric liquid crystal layer by applying the above composition directly on each cholesteric liquid crystal layer was shown, but the cholesteric liquid crystal layer is formed by applying each of the cholesteric liquid crystal layers on different substrates, forming an adhesion layer (for example, , an adhesive layer, an adhesive layer) may be interposed between the cholesteric liquid crystal layers.
  • an adhesion layer for example, , an adhesive layer, an adhesive layer
  • the adhesive used for the adhesive layer a commercially available adhesive can be arbitrarily used, but from the viewpoint of thinning and reducing the surface roughness Ra, the thickness is preferably 25 ⁇ m or less. , more preferably 15 ⁇ m or less, and most preferably 6 ⁇ m or less. In addition, it is preferable that the adhesive is less likely to outgas. In particular, when drawing or molding is performed, a vacuum process or a heating process may be performed, and it is preferable that outgassing does not occur even under these conditions.
  • a commercially available adhesive or the like can be arbitrarily used, and for example, an epoxy resin-based adhesive or an acrylic resin-based adhesive can be used.
  • the thickness of the adhesive is preferably 25 ⁇ m or less, more preferably 5 ⁇ m or less, from the viewpoint of thinning and from the viewpoint of reducing the surface roughness Ra of the reflective circular polarizer using the optical laminate. , 1 ⁇ m or less.
  • the adhesive preferably has a viscosity of 300 cP or less, more preferably 100 cP or less, from the viewpoints of thinning the adhesive layer and coating the adherend with a uniform thickness.
  • the pressure-sensitive adhesive or adhesive is used to reduce the surface roughness Ra of the reflective circular polarizer using the optical laminate. Appropriate viscoelasticity or thickness can also be selected so that irregularities can be embedded.
  • the pressure-sensitive adhesive or adhesive have a viscosity of 50 cP or more.
  • the thickness is preferably greater than the height of the surface unevenness.
  • Methods for adjusting the viscosity of the adhesive include, for example, a method using an adhesive containing a solvent. In this case, the viscosity of the adhesive can be adjusted by adjusting the solvent ratio. Further, by drying the solvent after applying the adhesive to the adherend, the thickness of the adhesive can be further reduced.
  • the pressure-sensitive adhesive or adhesive used for bonding each layer is different from the adjacent layer. is preferably small. Since the cholesteric liquid crystal layer has birefringence, the refractive indices in the fast axis direction and the slow axis direction are different. When the average refractive index of the layer is nave , the difference between the refractive index of the adjacent adhesive layer or adhesive layer and nave is preferably 0.075 or less, more preferably 0.05 or less, and 0.025 or less. More preferred.
  • the refractive index of the pressure-sensitive adhesive or adhesive can be adjusted by mixing fine particles of titanium oxide, fine particles of zirconia, or the like, for example.
  • the adhesive layer between each layer has a thickness of 100 nm or less.
  • the thickness of the adhesive layer is 100 nm or less, light in the visible range is less sensitive to difference in refractive index, and unnecessary reflection can be suppressed.
  • the thickness of the adhesive layer is more preferably 50 nm or less, and even more preferably 30 nm or less.
  • a method for forming an adhesive layer having a thickness of 100 nm or less for example, there is a method of vapor-depositing a ceramic adhesive such as silicon oxide (SiOx layer) on the bonding surface.
  • the bonding surface of the bonding member can be subjected to surface modification treatment such as plasma treatment, corona treatment, saponification treatment, etc., or can be provided with a primer layer before bonding.
  • the type and thickness of the adhesive layer can be adjusted for each bonding surface.
  • an adhesive layer having a thickness of 100 nm or less can be provided by the procedures shown in (1) to (3) below.
  • a layer to be laminated is attached to a temporary support made of a glass substrate.
  • a SiOx layer having a thickness of 100 nm or less is formed by vapor deposition or the like on both the surface of the layer to be laminated and the surface of the layer to be laminated.
  • Vapor deposition can be performed using SiOx powder as a vapor deposition source, for example, using a vapor deposition apparatus (model ULEYES) manufactured by ULVAC, Inc., or the like. Moreover, it is preferable to subject the surface of the formed SiOx layer to a plasma treatment. (3) After bonding the formed SiOx layers together, the temporary support is peeled off. It is preferable to perform lamination at a temperature of 120° C., for example.
  • the application, adhesion, or lamination of each layer may be performed by a roll-to-roll method or a sheet-fed method.
  • the roll-to-roll method is preferable from the viewpoint of improving productivity and reducing misalignment of each layer.
  • the single-wafer method is preferable because it is suitable for small-lot production of a wide variety of products, and because it allows selection of a special bonding method such that the thickness of the bonding layer is 100 nm or less.
  • methods for applying an adhesive to an adherend include roll coating, gravure printing, spin coating, wire bar coating, extrusion coating, direct gravure coating, reverse gravure coating, and die coating. well-known methods such as a method, a spray method, and an inkjet method.
  • the reflective circular polarizer using the optical laminate of the present invention may contain a support, an alignment layer, etc., but the support and the alignment layer are peeled off when producing a laminated optical film described later, It may be a temporary support that is removed.
  • the laminated optical film can be made thinner by transferring the reflective circular polarizer to another laminate and then removing the temporary support by peeling it off. It is preferable because the retardation has an adverse effect on the degree of polarization of transmitted light.
  • the type of support is not particularly limited, but it is preferably transparent to visible light. , and films such as polyester can be used. Among them, cellulose acylate film, cyclic polyolefin, polyacrylate, or polymethacrylate is preferred.
  • the support is a temporary support
  • a support with high tear strength is preferable from the viewpoint of preventing breakage during peeling.
  • polycarbonate and polyester films are preferred.
  • the support preferably has a small retardation from the viewpoint of suppressing adverse effects on the degree of polarization of transmitted light.
  • the magnitude of Re at 550 nm is preferably 10 nm or less
  • the absolute value of the magnitude of Rth is preferably 50 nm or less.
  • the temporary support may be used for quality inspection of the reflective circular polarizer and other laminates in the manufacturing process of the laminated optical film described later. is preferably small.
  • a reflective circular polarizer using an optical laminate used in the laminated optical film is preferably transparent to near-infrared light.
  • the laminated optical film of the present invention has at least a reflective circular polarizer, a retardation layer for converting circularly polarized light into linearly polarized light, and a linear polarizer in this order.
  • the reflective circular polarizer the above-described optical layered body (first embodiment, second embodiment, or third embodiment) is used. Preferred aspects of the optical laminate (first embodiment, second embodiment, or third embodiment) are as described above.
  • FIG. 5 is a schematic diagram of a virtual reality display device using the laminated optical film of the present invention.
  • laminated optical film 100 having a reflective circular polarizer using the optical laminate, half mirror 300, circular polarizer 400, and image display A panel 500 is arranged.
  • a light ray 1000 emitted from the image display panel 500 is transmitted through the circularly polarizing plate 400 to be circularly polarized, and is transmitted through the half mirror 300 .
  • the light enters the laminated optical film 100 of the present invention from the reflective circular polarizer side, is totally reflected, is reflected again by the half mirror 300, and enters the laminated optical film 100 again.
  • the light ray 1000 is reflected by the half-mirror, so that the light ray 1000 is circularly polarized in a direction opposite to the circularly polarized light when it first enters the laminated optical film 100 . Therefore, the light ray 1000 passes through the laminated optical film 100 and is visually recognized by the user. Furthermore, when the light ray 1000 is reflected by the half mirror 300, the image displayed on the image display panel 500 is magnified because the half mirror has the shape of a concave mirror, and the user visually recognizes the magnified virtual image. be able to.
  • the mechanism described above is called a reciprocating optical system, a folding optical system, or the like.
  • FIG. 6 is a schematic diagram for explaining a case where a ghost occurs in the virtual reality display device shown in FIG. More specifically, in the virtual reality display device, when the light ray 2000 enters the laminated optical film 100 for the first time, it is transmitted without being reflected, resulting in leakage light. As shown in FIG. 6, when a light ray 2000 is incident on the laminated optical film 100 for the first time, it is transmitted without being reflected, and leakage light occurs. As can be seen from FIG. Visually recognize an image that does not exist. This image is called a ghost or the like, and is required to be reduced.
  • the laminated optical film 100 of the present invention Since the laminated optical film 100 of the present invention has a high degree of polarization, it is possible to reduce leakage of transmitted light (that is, ghost) when light rays first enter the laminated optical film 100 . In addition, since the laminated optical film 100 of the present invention also has a high degree of polarization with respect to transmitted light, the transmittance can be increased when light rays enter the laminated optical film 100 for the second time, and a virtual image can be generated. The brightness of the virtual image can be improved, and further, the tint of the virtual image can be suppressed.
  • the laminated optical film 100 may be formed on a curved surface such as a lens, as shown in FIGS. 5 and 6.
  • the reflective circular polarizer does not have an optical axis, so that the degree of polarization is less likely to decrease due to stretching or molding. Therefore, even when the laminated optical film 100 is formed into a curved shape, the degree of polarization is less likely to decrease.
  • FIG. 7 shows an example of the layer structure of the laminated optical film 100 of the present invention.
  • an antireflection layer 101, a positive C plate 102, a reflective circular polarizer 103, a positive C plate 104, a retardation layer 105 and a linear polarizer 106 are arranged in this order.
  • the optical laminate is used for the reflective circular polarizer 103 .
  • the antireflection layer 101, the positive C plate 102, and the positive C plate 104 are used in the embodiment shown in FIG. 7, part or all of the above configuration may be omitted.
  • the laminated optical film of the present invention has the reflective circular polarizer 103, the retardation layer 105 that converts circularly polarized light into linearly polarized light, and the linear polarizer 106 in this order. After conversion to polarized light, it can be absorbed by a linear polarizer. Therefore, the degree of polarization of transmitted light can be increased.
  • the laminated optical film is stretched or molded, there is a concern that the slow axis of the retardation layer and the absorption axis of the linear polarizer may be distorted. , still have a high degree of polarization, and the amount of leaked light from the reflective circular polarizer is small, so the increase in leaked light is kept to a small amount.
  • the laminated optical film of the present invention preferably has a surface roughness Ra of 100 nm or less. If the Ra is small, for example, when the laminated optical film is used in a virtual reality display device or the like, the sharpness of the image can be improved.
  • the present inventors presume that, when light is reflected on the laminated optical film, if there is unevenness, the angle of the reflected light is distorted, leading to image distortion and blurring.
  • Ra of the laminated optical film is more preferably 50 nm or less, still more preferably 30 nm or less, and particularly preferably 10 nm or less.
  • the laminated optical film of the present invention is produced by laminating a large number of layers.
  • Ra is preferably small for all layers.
  • Each layer of the laminated optical film of the present invention preferably has an Ra of 50 nm or less, more preferably 30 nm or less, and even more preferably 10 nm or less.
  • Ra of the reflective circular polarizer is small.
  • the surface roughness Ra can be measured using, for example, a non-contact surface/layer cross-sectional shape measurement system VertScan (manufactured by Ryoka System Co., Ltd.).
  • Vertscan is a surface profile measurement method that uses the phase of reflected light from a sample. Reflected light from the inside may be superimposed and the surface shape may not be accurately measured. In this case, a metal layer may be formed on the surface of the sample in order to increase the reflectance of the surface and further suppress reflection from the inside.
  • a method of forming a metal layer on the surface of a sample for example, a sputtering method is used. Materials to be sputtered include Au, Al, and Pt.
  • the laminated optical film of the present invention preferably has a small number of point defects per unit area. Since the laminated optical film of the present invention is produced by laminating a large number of layers, the number of point defects in each layer is preferably small in order to reduce the number of point defects in the entire laminated optical film. Specifically, the number of point defects in each layer is preferably 20 or less, more preferably 10 or less, and even more preferably 1 or less per square meter. For the laminated optical film as a whole, the number of point defects per square meter is preferably 100 or less, more preferably 50 or less, and even more preferably 5 or less. A small number of point defects is preferable because it leads to a decrease in the degree of polarization of transmitted light and a decrease in image sharpness.
  • the point defect includes a foreign substance, a scratch, a stain, a variation in film thickness, an alignment defect of a liquid crystal compound, and the like.
  • the laminated optical film of the present invention is preferably transparent to near-infrared light.
  • the retardation layer used in the laminated optical film of the present invention has a function of converting the emitted light into approximately linearly polarized light when circularly polarized light is incident thereon.
  • a retardation layer in which Re is approximately 1/4 wavelength at any wavelength in the visible region is preferably 120 nm to 150 nm, more preferably 125 nm to 145 nm, even more preferably 135 nm to 140 nm.
  • a retardation layer having an Re of about 3/4 wavelength or about 5/4 wavelength is also preferable because it can convert linearly polarized light into circularly polarized light.
  • the retardation layer used in the laminated optical film of the present invention preferably has reverse dispersion with respect to wavelength. Having reverse dispersion is preferable because circularly polarized light can be converted into linearly polarized light over a wide wavelength range in the visible region.
  • having reverse dispersion with respect to wavelength means that the value of the phase difference at that wavelength increases as the wavelength increases.
  • the retardation layer having reverse dispersion can be produced by, for example, referring to JP-A-2017-049574 and the like, and uniaxially stretching a polymer film such as a modified polycarbonate resin film having reverse dispersion. Further, the retardation layer having reverse dispersion may have substantially reverse dispersion, for example, as disclosed in Japanese Patent No.
  • Re is about 1/4 wavelength.
  • a retardation layer and a retardation layer in which Re is about 1/2 wavelength can also be produced by stacking them so that their slow axes form an angle of about 60°.
  • the 1/4 wavelength retardation layer and the 1/2 wavelength retardation layer each have normal dispersion (as the wavelength increases, the value of the retardation at the wavelength decreases), even in the visible range
  • circularly polarized light can be converted into linearly polarized light over a wide wavelength range of , and can be regarded as having substantially reverse dispersion.
  • the laminated optical film of the present invention preferably has a reflective circular polarizer, a quarter-wave retardation layer, a half-wave retardation layer, and a linear polarizer in this order.
  • the retardation layer used in the laminated optical film of the present invention preferably has a layer formed by fixing a uniformly aligned liquid crystal compound.
  • a layer in which a rod-like liquid crystal compound is uniformly aligned horizontally to the in-plane direction, or a layer in which a discotic liquid crystal compound is uniformly aligned perpendicular to the in-plane direction can be used.
  • a retardation layer having reverse dispersion can be produced by uniformly aligning and fixing a rod-shaped liquid crystal compound having reverse dispersion. can.
  • the retardation layer used in the laminated optical film of the present invention preferably has a layer formed by immobilizing a liquid crystal compound twisted with the thickness direction as the helical axis.
  • a retardation having a layer formed by fixing a rod-like liquid crystal compound or a discotic liquid crystal compound twisted with the thickness direction as a helical axis can also be used, in which case the retardation layer can be considered to have substantially reverse dispersion properties, which is preferred.
  • the thickness of the retardation layer is not particularly limited, it is preferably 0.1 to 8 ⁇ m, more preferably 0.3 to 5 ⁇ m, from the viewpoint of thinning.
  • the retardation layer of the present invention may contain a support, an orientation layer, etc., and the support and orientation layer may be a temporary support that is peeled off and removed when producing a laminated optical film. good.
  • the support and orientation layer may be a temporary support that is peeled off and removed when producing a laminated optical film. good.
  • the laminated optical film can be made thinner, and the temporary support has This is preferable because the retardation can eliminate adverse effects on the degree of polarization of transmitted light.
  • the type of support is not particularly limited, but it is preferably transparent to visible light.
  • Examples include cellulose acylate, polycarbonate, polysulfone, polyethersulfone, polyacrylate, polymethacrylate, cyclic polyolefin, polyolefin, polyamide, polystyrene. , and films such as polyester can be used. Among them, cellulose acylate film, cyclic polyolefin, polyacrylate, or polymethacrylate is preferred. In addition, commercially available cellulose acetate films (for example, “TD80U” and “Z-TAC” manufactured by FUJIFILM Corporation) can also be used. When the support is a temporary support, a support with high tear strength is preferred from the viewpoint of preventing breakage during peeling. For example, polycarbonate and polyester films are preferred.
  • the support preferably has a small retardation from the viewpoint of suppressing adverse effects on the degree of polarization of transmitted light.
  • the magnitude of Re is preferably 10 nm or less
  • the absolute value of the magnitude of Rth is preferably 50 nm or less.
  • the phase difference of the temporary support may be used in quality inspection of the retardation layer and other laminates in the manufacturing process of the laminated optical film. is preferably small.
  • the retardation layer used in the laminated optical film of the invention is preferably transparent to near-infrared light.
  • the linear polarizer used in the laminated optical film of the present invention is preferably an absorption linear polarizer.
  • An absorption-type linear polarizer absorbs linearly polarized light in the direction of the absorption axis and transmits linearly polarized light in the direction of the transmission axis out of incident light.
  • a general polarizer can be used.
  • a polarizer obtained by dyeing polyvinyl alcohol or other polymer resin with a dichroic substance and stretching the dichroic substance may be used.
  • a polarizer in which a dichroic substance is oriented using the orientation of a liquid crystal compound may also be used.
  • a polarizer obtained by dyeing polyvinyl alcohol with iodine and stretching is preferred.
  • the thickness of the linear polarizer is preferably 10 ⁇ m or less, more preferably 7 ⁇ m or less, and even more preferably 5 ⁇ m or less.
  • the linear polarizer is thin, it is possible to prevent the film from cracking or breaking when the laminated optical film is stretched or molded.
  • the single plate transmittance of the linear polarizer is preferably 40% or more, more preferably 42% or more.
  • the degree of polarization is preferably 90% or more, more preferably 95% or more, and even more preferably 99% or more.
  • the single-plate transmittance and the degree of polarization of the linear polarizer are measured using an automatic polarizing film measuring device: VAP-7070 (manufactured by JASCO Corporation).
  • VAP-7070 automatic polarizing film measuring device
  • the direction of the transmission axis of the linear polarizer preferably coincides with the direction of the polarization axis of the light converted into linearly polarized light by the retardation layer.
  • the angle formed by the transmission axis of the linear polarizer and the slow axis of the retardation layer is preferably approximately 45°.
  • the linear polarizer used in the laminated optical film of the invention is also preferably a light absorption anisotropic layer containing a liquid crystal compound and a dichroic substance.
  • a linear polarizer containing a liquid crystal compound and a dichroic substance is preferable because it can be made thin and is less likely to crack or break even when stretched or molded.
  • the thickness of the light absorption anisotropic layer is not particularly limited, it is preferably 0.1 to 8 ⁇ m, more preferably 0.3 to 5 ⁇ m, from the viewpoint of thinning.
  • a linear polarizer containing a liquid crystal compound and a dichroic substance can be produced, for example, with reference to Japanese Unexamined Patent Application Publication No. 2020-023153. From the viewpoint of improving the degree of polarization of the linear polarizer, the degree of orientation of the dichroic substance in the light absorption anisotropic layer is preferably 0.95 or more, more preferably 0.97 or more.
  • the liquid crystal compound contained in the light absorption anisotropic layer-forming composition for forming the light absorption anisotropic layer is preferably a liquid crystal compound that does not exhibit dichroism in the visible region.
  • the liquid crystal compound both a low-molecular-weight liquid crystal compound and a high-molecular-weight liquid crystal compound can be used.
  • the term "low-molecular-weight liquid crystal compound” refers to a liquid crystal compound having no repeating unit in its chemical structure.
  • polymeric liquid crystal compound refers to a liquid crystal compound having a repeating unit in its chemical structure.
  • Polymer liquid crystal compounds include, for example, thermotropic liquid crystal polymers described in JP-A-2011-237513.
  • the polymer liquid crystal compound preferably has a crosslinkable group (for example, an acryloyl group and a methacryloyl group) at its terminal.
  • a liquid crystal compound may be used individually by 1 type, and may use 2 or more types together. It is also preferable to use a high-molecular-weight liquid crystal compound and a low-molecular-weight liquid crystal compound together.
  • the content of the liquid crystal compound is preferably 25 to 2000 parts by mass, more preferably 33 to 1000 parts by mass, and further 50 to 500 parts by mass with respect to 100 parts by mass of the content of the dichroic substance in the present composition. preferable. When the content of the liquid crystal compound is within the above range, the degree of orientation of the polarizer is further improved.
  • the dichroic substance contained in the light absorption anisotropic layer-forming composition for forming the light absorption anisotropic layer is not particularly limited, and includes a visible light absorbing substance (dichroic dye), an ultraviolet absorbing substance, Infrared absorption substances, nonlinear optical substances, carbon nanotubes, etc. can be mentioned, and conventionally known dichroic substances (dichroic dyes) can be used.
  • dichroic dyes conventionally known dichroic substances
  • two or more dichroic substances may be used in combination. For example, from the viewpoint of obtaining a high degree of polarization over a wider wavelength range, at least one substance having a maximum absorption wavelength in the wavelength range of 370 to 550 nm. and at least one dichroic substance having a maximum absorption wavelength in the wavelength range of 500 to 700 nm.
  • the linear polarizer of the present invention comprises a light absorption anisotropic layer containing a liquid crystal compound and a dichroic substance
  • the linear polarizer may contain a support, an alignment layer and the like.
  • the carrier and alignment layers may be temporary supports that are peeled off and removed in making the laminated optical film.
  • the laminated optical film can be made thinner by transferring the light absorption anisotropic layer to another laminate and then peeling off the temporary support. This is preferable because the phase difference of the body can eliminate the adverse effect on the degree of polarization of transmitted light.
  • the type of support is not particularly limited, but it is preferably transparent to visible light, and for example, the same support as the support used as the retardation layer can be used.
  • Preferred aspects of the support used for the linear polarizer are the same as the preferred aspects of the support used as the retardation layer.
  • the linear polarizer used in the laminated optical film of the invention is preferably transparent to near-infrared light.
  • the laminated optical film of the present invention may have other functional layers in addition to the reflective circular polarizer, retardation layer, and linear polarizer.
  • the functional layer is preferably transparent to near-infrared light.
  • the laminated optical film of the present invention further has a positive C plate.
  • the positive C plate is a retardation layer in which Re is substantially zero and Rth has a negative value.
  • a positive C plate can be obtained, for example, by vertically aligning a rod-like liquid crystal compound.
  • the positive C plate functions as an optical compensation layer for increasing the degree of polarization of transmitted light with respect to obliquely incident light.
  • the positive C-plate can be installed at any position on the laminated optical film, and a plurality of positive C-plates may be installed.
  • the positive C plate may be placed adjacent to the reflective circular polarizer or inside the reflective circular polarizer.
  • the reflective layer has a positive Rth.
  • the polarization states of the reflected light and the transmitted light change due to the action of Rth, and the degree of polarization of the transmitted light may decrease.
  • the positive C plate is preferably placed on the opposite side of the blue light reflective layer to the green reflective layer, but may be placed elsewhere.
  • Re of the positive C plate is preferably approximately 10 nm or less, and Rth is preferably ⁇ 600 to ⁇ 100 nm, more preferably ⁇ 400 to ⁇ 200 nm.
  • the positive C plate may be placed adjacent to the retardation layer or inside the retardation layer.
  • the retardation layer has a positive Rth.
  • the polarization state of the transmitted light may change due to the action of Rth, and the degree of polarization of the transmitted light may decrease.
  • It is preferable to have a positive C plate inside or near the retardation layer because it is possible to suppress changes in the polarization state of obliquely incident light and to suppress a decrease in the degree of polarization of transmitted light.
  • the positive C plate is preferably placed on the side of the retardation layer opposite to the linear polarizer, but may be placed elsewhere.
  • Re of the positive C plate is preferably about 10 nm or less, and Rth is preferably -90 to -40 nm.
  • the laminated optical film of the present invention also preferably has an antireflection layer on its surface.
  • the laminated optical film of the present invention has a function of reflecting specific circularly polarized light and transmitting circularly polarized light orthogonal thereto. may reduce the degree of polarization of transmitted light. Therefore, the laminated optical film preferably has an antireflection layer on its surface.
  • the antireflection layer may be provided only on one surface of the laminated optical film, or may be provided on both surfaces.
  • the type of the antireflection layer is not particularly limited, a moth-eye film or an AR (Anti-Reflective) film is preferable from the viewpoint of lowering the reflectance. Known moth-eye films and AR films can be used.
  • the laminated optical film is stretched or molded
  • a moth-eye film is preferable because high antireflection performance can be maintained even if the film thickness varies due to stretching.
  • the Tg peak temperature of the support should be 170° C. or less from the viewpoint of facilitating the stretching or molding. It is preferably 130° C. or lower, and more preferably 130° C. or lower. Specifically, for example, a PMMA film or the like is preferable.
  • the laminated optical film of the present invention further has a second retardation layer.
  • a reflective circular polarizer, a retardation layer, a linear polarizer, and a second retardation layer may be included in this order.
  • the second retardation layer preferably converts linearly polarized light into circularly polarized light, and is preferably a retardation layer having Re of 1/4 wavelength, for example. The reason is explained below.
  • the light incident on the laminated optical film from the reflective circular polarizer side and transmitted through the reflective circular polarizer, the retardation layer, and the linear polarizer is linearly polarized, and part of it is on the linear polarizer side.
  • the second retardation layer that converts linearly polarized light into circularly polarized light
  • the light reaching the outermost surface on the side of the linear polarizer becomes circularly polarized light
  • the light is orthogonally polarized.
  • the second retardation layer when the light is transmitted through the second retardation layer again and reaches the linear polarizer, it becomes linearly polarized light with the absorption axis direction of the linear polarizer and is absorbed by the linear polarizer. Therefore, unnecessary reflection can be prevented.
  • the second retardation layer preferably has substantially reverse dispersion.
  • the laminated optical film of the invention may further have a support.
  • the support can be placed at any location.
  • the support is used as the transfer destination.
  • the type of support is not particularly limited, but it is preferably transparent to visible light. Examples include cellulose acylate, polycarbonate, polysulfone, polyethersulfone, polyacrylate, polymethacrylate, cyclic polyolefin, polyolefin, polyamide, polystyrene , and films such as polyester can be used.
  • the support preferably has a small retardation from the viewpoint of suppressing adverse effects on the degree of polarization of transmitted light and from the viewpoint of facilitating optical inspection of the laminated optical film.
  • the magnitude of Re is preferably 10 nm or less
  • the absolute value of the magnitude of Rth is preferably 50 nm or less.
  • the support When the laminated optical film of the present invention is to be stretched or molded, the support preferably has a tan ⁇ peak temperature of 170°C or less. From the viewpoint of enabling molding at low temperatures, the peak temperature of tan ⁇ is preferably 150° C. or lower, more preferably 130° C. or lower.
  • Sample 5 mm, length 50 mm (gap 20 mm) Measurement conditions: Tensile mode Measurement temperature: -150°C to 220°C Temperature rising conditions: 5°C/min Frequency: 1Hz Generally, in optical applications, a stretched resin base material is often used, and the peak temperature of tan ⁇ often becomes high due to the stretching process.
  • a TAC (triacetyl cellulose) substrate TG40, manufactured by Fujifilm Corporation
  • Various resin substrates can be used for the support having a peak temperature of tan ⁇ of 170°C or less without particular limitation.
  • Polyolefins such as polyethylene, polypropylene, and norbornene-based polymers; cyclic olefin-based resins; polyvinyl alcohol; polyethylene terephthalate; acrylic resins such as polymethacrylates and polyacrylates; polyether ketones; polyphenylene sulfides and polyphenylene oxides.
  • cyclic olefin resins, polyethylene terephthalate, and acrylic resins are preferable, and cyclic olefin resins and polymethacrylates are particularly preferable, because they are readily available on the market and have excellent transparency. is.
  • resin substrates include Technoloy S001G, Technoloy S014G, Technoloy S000, Technoloy C001, Technoloy C000 (Sumika Acrylic Sales Co., Ltd.), Lumirror U type, Lumirror FX10, Lumirror SF20 (Toray Industries, Inc.), HK-53A ( Higashiyama Film Co., Ltd.), Teflex FT3 (Teijin DuPont Films Co., Ltd.), Escina” and SCA40 (Sekisui Chemical Co., Ltd.), Zeonor Film (Optes Co., Ltd.), Arton Film (JSR Co., Ltd.), etc. be done.
  • the thickness of the support is not particularly limited, it is preferably 5 to 300 ⁇ m, more preferably 5 to 100 ⁇ m, even more preferably 5 to 30 ⁇ m.
  • the laminated optical film may have layers other than the layers described above.
  • layers other than those described above include an adhesive layer formed with an adhesive described later, an adhesive layer formed with an adhesive described later, and a refractive index adjustment layer.
  • a refractive index adjustment layer having a smaller difference in refractive index between the fast axis direction and the slow axis direction than the reflective circular polarizer is provided.
  • the refractive index adjusting layer preferably has a layer formed by fixing the alignment state of the cholesteric liquid crystal.
  • the average refractive index of the refractive index adjusting layer is more preferably smaller than the average refractive index of the reflective circular polarizer.
  • the center wavelength of the reflected light from the refractive index adjusting layer may be smaller than 430 nm or larger than 670 nm, more preferably smaller than 430 nm.
  • the laminated optical film of the present invention is a laminate composed of multiple layers.
  • Each layer can be adhered by any adhesion method, for example, a pressure sensitive adhesive or an adhesive can be used.
  • the adhesive any commercially available adhesive can be used, but from the viewpoint of thinning and reducing the surface roughness Ra of the laminated optical film, the thickness is preferably 25 ⁇ m or less, and 15 ⁇ m. It is more preferably 6 ⁇ m or less, and most preferably 6 ⁇ m or less. In addition, it is preferable that the adhesive is less likely to outgas.
  • the adhesive when drawing or molding is performed, a vacuum process or a heating process may be performed, and it is preferable that outgassing does not occur even under these conditions.
  • a commercially available adhesive or the like can be arbitrarily used, and for example, an epoxy resin-based adhesive or an acrylic resin-based adhesive can be used.
  • the thickness of the adhesive is preferably 25 ⁇ m or less, more preferably 5 ⁇ m or less, and preferably 1 ⁇ m or less, from the viewpoint of thinning and the viewpoint of reducing the surface roughness Ra of the laminated optical film. Most preferred.
  • the adhesive preferably has a viscosity of 300 cP or less, more preferably 100 cP or less, and 10 cP or less from the viewpoint of thinning the adhesive layer and applying the adhesive to the adherend with a uniform thickness. is more preferred.
  • the pressure-sensitive adhesive or the adhesive is used to embed the surface irregularities of the layer to be adhered from the viewpoint of reducing the surface roughness Ra of the laminated optical film. Appropriate viscoelasticity or thickness can also be selected. From the viewpoint of embedding surface irregularities, it is preferable that the pressure-sensitive adhesive or adhesive have a viscosity of 50 cP or more.
  • the thickness is preferably greater than the height of the surface unevenness.
  • Methods for adjusting the viscosity of the adhesive include, for example, a method using an adhesive containing a solvent.
  • the viscosity of the adhesive can be adjusted by adjusting the solvent ratio. Further, by drying the solvent after applying the adhesive to the adherend, the thickness of the adhesive can be further reduced.
  • the pressure-sensitive adhesive or adhesive used for bonding each layer should have a refractive index difference between adjacent layers. Small is preferred. Specifically, the difference in refractive index between adjacent layers is preferably 0.1 or less, more preferably 0.05 or less, and even more preferably 0.01 or less.
  • the refractive index of the pressure-sensitive adhesive or adhesive can be adjusted by, for example, mixing fine particles of titanium oxide, fine particles of zirconia, or the like.
  • the reflective circular polarizer, the retardation layer, and the linear polarizer may have in-plane refractive index anisotropy. It is preferably 0.05 or less. Therefore, the pressure-sensitive adhesive or the adhesive may have in-plane refractive index anisotropy.
  • the adhesive layer between each layer has a thickness of 100 nm or less.
  • the thickness of the adhesive layer is more preferably 50 nm or less.
  • a method for forming an adhesive layer having a thickness of 100 nm or less for example, there is a method of vapor-depositing a ceramic adhesive such as silicon oxide (SiOx layer) on the bonding surface.
  • the bonding surface of the bonding member can be subjected to surface modification treatment such as plasma treatment, corona treatment, saponification treatment, etc., or can be provided with a primer layer before bonding.
  • the type and thickness of the adhesive layer can be adjusted for each bonding surface.
  • an adhesive layer having a thickness of 100 nm or less can be provided by the procedures shown in (1) to (3) below.
  • (1) A layer to be laminated is attached to a temporary support made of a glass substrate.
  • a SiOx layer having a thickness of 100 nm or less is formed by vapor deposition or the like on both the surface of the layer to be laminated and the surface of the layer to be laminated.
  • Vapor deposition can be performed using SiOx powder as a vapor deposition source, for example, using a vapor deposition apparatus (model ULEYES) manufactured by ULVAC, Inc., or the like. Moreover, it is preferable to subject the surface of the formed SiOx layer to a plasma treatment. (3) After laminating the formed SiOx layers, the temporary support is peeled off. It is preferable to perform lamination at a temperature of 120° C., for example.
  • Each layer may be applied, adhered, or laminated by a roll-to-roll method or a sheet-by-sheet method.
  • the roll-to-roll method is preferable from the viewpoint of improving productivity and reducing misalignment of each layer.
  • the single-wafer method is preferable because it is suitable for small-lot production of a wide variety of products, and because it allows selection of a special bonding method such that the thickness of the bonding layer is 100 nm or less.
  • methods for applying an adhesive to an adherend include roll coating, gravure printing, spin coating, wire bar coating, extrusion coating, direct gravure coating, reverse gravure coating, and die coating. well-known methods such as a method, a spray method, and an inkjet method.
  • each layer it is also preferable not to have an adhesive layer between each layer of the laminated optical film of the present invention.
  • the adhesive layer can be eliminated by applying directly onto the adjacent layer that has already been formed.
  • the alignment direction of the liquid crystal compound is changed continuously at the interface in order to reduce the refractive index difference in all directions in the plane.
  • a linear polarizer containing a liquid crystal compound and a dichroic substance is directly coated with a retardation layer containing a liquid crystal compound, and the liquid crystal compound of the retardation layer is controlled by the alignment control force of the liquid crystal compound of the linear polarizer. can be oriented so as to be continuous at the interface.
  • the laminated optical film of the present invention is composed of a number of layers
  • the order of laminating the layers is not particularly limited and can be arbitrarily selected.
  • the lamination order so that the thickness of the film to be transferred is 10 ⁇ m or more, wrinkles and cracks during transfer can be prevented. can be prevented.
  • the surface irregularities may be further amplified. It is preferable to stack the layers in order from the smallest layer.
  • the order of lamination can also be selected from the viewpoint of quality evaluation in the production process of the laminated optical film. For example, after stacking layers other than a reflective circular polarizer and performing quality evaluation by a transmission optical system, a reflective circular polarizer can be stacked and quality evaluation can be performed by a reflective optical system.
  • the order of lamination can also be selected from the viewpoint of improving the production yield of the laminated optical film and reducing the cost.
  • the laminated optical film of the present invention can be used, for example, as a reflective polarizer to be incorporated in an in-vehicle rearview mirror, a virtual reality display device, an electronic viewfinder, and the like, as described in Patent Documents 4 and 5.
  • a virtual reality display device, an electronic viewfinder, or the like having a reciprocating optical system in which light is reflected and reciprocated between a reflective polarizer and a half mirror
  • the laminated optical film of the present invention improves the clarity of the displayed image. It is very useful from the viewpoint of improvement.
  • having a reciprocating optical system may have optical films such as absorptive polarizers and circular polarizers in addition to reflective polarizers.
  • optical films such as absorptive polarizers and circular polarizers in addition to reflective polarizers.
  • ⁇ Coating solution for reflective layer R-1> The composition shown below was stirred and dissolved in a container kept at 70° C. to prepare a reflective layer coating solution R-1.
  • R represents a coating liquid using a rod-like liquid crystal compound.
  • the numerical values are % by mass.
  • R is a group bonded with an oxygen atom.
  • the average molar extinction coefficient of the rod-shaped liquid crystal at a wavelength of 300 to 400 nm was 140/mol ⁇ cm.
  • Chiral agent A is a chiral agent whose helical twisting power (HTP) is reduced by light.
  • a coating solution for reflective layer R-1 was prepared in the same manner as the coating solution for reflective layer R-1, except that the amount of chiral agent A added was changed as shown in Table 1 below.
  • ⁇ Reflective layer coating liquid R-7> It was prepared in the same manner as the reflective layer coating solution R-1, except that chiral agent A was changed to chiral agent B whose synthesis method is shown below. A method for synthesizing the chiral agent B is described below.
  • sodium bisulfite water (18.28 g of sodium bisulfite (manufactured by Wako Pure Chemical Industries, Ltd.), 275 mL of water) was added to the obtained reaction solution while maintaining the temperature at 10°C or less, and then the temperature was raised to room temperature. layer was removed. The organic layer was washed with 275 mL of water and sodium bicarbonate water (11.0 g of sodium bicarbonate (manufactured by Wako Pure Chemical Industries, Ltd.), 275 mL of water) in that order. After the washed solution was dried with magnesium sulfate, the solvent was distilled off under reduced pressure to make the liquid amount 160 g, and then transferred to a three-necked flask.
  • the mixture was cooled to room temperature, 420 mL of toluene (manufactured by Wako Pure Chemical Industries, Ltd.) was added, filtered through celite to remove solids, and washed with 305 mL of toluene.
  • the solution after filtering off the solid was washed twice with a mixture of 77.8 g of sodium chloride, 11.84 g of concentrated hydrochloric acid and 440 mL of water, and then with a mixture of 103 g of sodium chloride and 415 mL of water.
  • silica gel (Wakogel C200, manufactured by Wako Pure Chemical Industries) was added, and after stirring for 1 hour, solids were removed by celite filtration while washing with 490 mL of toluene. After the solid was filtered off, 0.19 g of TEMPO was added to the solution, and the solvent was distilled off under reduced pressure. After the liquid volume was 100 mL, it was transferred to a three-necked flask, 40 mL of toluene was added, and the temperature was raised to 60°C.
  • Chiral agent B can also be synthesized by the following synthesis method.
  • (Another method for synthesizing chiral agent B] Intermediate 1 is used, and the reaction, liquid separation, and adsorbent treatment are carried out in the same manner as in the synthesis method of Intermediate 2 except that butyl acrylate in the synthesis method of Intermediate 2 in Synthesis Example 1 is changed to ethyl acrylate, and acetic acid is obtained.
  • the chiral agent B is directly synthesized by precipitating a solid using ethyl/methanol and filtering it. It was confirmed that the chiral agent B can be synthesized by the above method as well. (Yield: 61%, HPLC purity 99.0%).
  • ⁇ Coating solution for reflective layer D-1> A composition shown below was stirred and dissolved in a container kept at 50° C. to prepare a reflective layer coating solution D-1.
  • D represents a coating liquid using discotic liquid crystal.
  • a PET (polyethylene terephthalate) film (manufactured by Toyobo Co., Ltd., A4100) having a thickness of 50 ⁇ m was prepared as a temporary support. This PET film has an easily adhesive layer on one side.
  • the surface of the PET film having no easy adhesion layer was subjected to rubbing treatment, coated with the reflective layer coating liquid R-1 prepared above with a wire bar coater, and dried at 110° C. for 120 seconds. After that, in a low-oxygen atmosphere (100 ppm or less), at 100° C., by irradiating light from a metal halide lamp with an illuminance of 80 mW/cm 2 and an irradiation amount of 500 mJ/cm 2 , the red light composed of the cholesteric liquid crystal layer is cured. A reflective layer (first light reflective layer) was formed. Light irradiation was performed from the cholesteric liquid crystal layer side. At this time, the coating thickness was adjusted so that the film thickness of the red light reflecting layer after curing was 4.5 ⁇ m.
  • the surface of the red light reflective layer was subjected to corona treatment at a discharge amount of 150 W ⁇ min/m 2 , and then the reflective layer coating solution D-1 was applied to the corona-treated surface using a wire bar coater. Subsequently, the coating film was dried at 70° C. for 2 minutes to evaporate the solvent, and then heat-aged at 115° C. for 3 minutes to obtain a uniform alignment state. After that, this coating film is held at 45° C. and cured by irradiating ultraviolet rays (300 mJ/cm 2 ) using a metal halide lamp in a nitrogen atmosphere to form a yellow light reflecting layer (second layer) on the red light reflecting layer. A second light reflecting layer) was formed. Light irradiation was performed from the cholesteric liquid crystal layer side. At this time, the coating thickness was adjusted so that the film thickness of the yellow light reflecting layer after curing was 3.3 ⁇ m.
  • the reflective layer coating liquid R-2 was applied onto the yellow light reflective layer with a wire bar coater and then dried at 110° C. for 120 seconds. After that, in a low oxygen atmosphere (100 ppm or less), at 100 ° C., by irradiating light from a metal halide lamp with an illuminance of 80 mW and an irradiation amount of 500 mJ / cm 2 to cure, the green light reflective layer is formed on the yellow light reflective layer. (third light reflecting layer) was formed. Light irradiation was performed from the cholesteric liquid crystal layer side. At this time, the coating thickness was adjusted so that the film thickness of the green light reflecting layer after curing was 2.7 ⁇ m.
  • the surface of the green light reflective layer was subjected to corona treatment at a discharge amount of 150 W ⁇ min/m 2 , and then the reflective layer coating solution D-2 was applied to the corona-treated surface using a wire bar coater. Subsequently, the coating film was dried at 70° C. for 2 minutes to evaporate the solvent, and then heat-aged at 115° C. for 3 minutes to obtain a uniform alignment state. Thereafter, this coating film is held at 45° C., and is cured by irradiating ultraviolet rays (300 mJ/cm 2 ) using a metal halide lamp in a nitrogen atmosphere to form a blue light reflecting layer (second layer) on the green light reflecting layer. Four light reflective layers) were formed. Light irradiation was performed from the cholesteric liquid crystal layer side. At this time, the coating thickness was adjusted so that the film thickness of the blue light reflecting layer after curing was 2.5 ⁇ m.
  • Reflective circular polarizers 2 to 7 and 10 were produced by the same production method as reflective circular polarizer 1, except that the reflective layer coating solution and film thickness were changed as shown in the table below.
  • the reflective circular polarizers 11 to 13 are the same as the reflective circular polarizer 1, except that the number of layers is increased to 6, 8, and 16 layers, and the coating liquid for the reflective layer and the film thickness are changed as shown in the table below. It was produced by the production method.
  • Table 3-1 Coating solutions used for making reflective circular polarizers 1 to 10 Table 3-2. Coating liquids used for producing reflective circular polarizer 11 Table 3-3. Coating liquid used for making reflective circular polarizer 12 Table 3-4. Coating Liquid Used to Prepare Reflective Circular Polarizer 13 In the table below, the reflective layer coating liquid R-1 is abbreviated as “liquid R-1”.
  • the reflective circular polarizer 8 is formed by laminating and coating two light reflecting layers on a temporary support. Created by transcription. Film 1 is obtained by forming a first light-reflecting layer and a second light-reflecting layer in this order on a temporary support. Film 2 is obtained by forming a third light-reflecting layer and a fourth light-reflecting layer in this order on a temporary support. The transfer of the light reflecting layer was performed according to the following procedure. (1) First, the light reflecting layer of Film 2 was transferred to the laminate film. The transfer to the laminate film was performed by bonding a laminate film with an adhesive to the surface of the film 2 opposite to the temporary support, and then peeling off the temporary support.
  • a UV adhesive Chemiseal U2084B (manufactured by Chemitec Co., Ltd., refractive index after curing: n: 1.60) was applied to the surface of film 1 opposite to the temporary support with a wire bar coater so as to have a thickness of 2 ⁇ m. .
  • the laminated film was laminated thereon with a laminator so that the light reflecting layer transferred to the laminate film was in contact therewith.
  • the purge box was purged with nitrogen until the oxygen concentration became 100 ppm or less, and then cured by irradiating ultraviolet light from a high-pressure mercury lamp from the temporary support side of film 1 .
  • the illuminance was 25 mW/cm 2 and the dose was 1000 mJ/cm 2 .
  • a reflective circular polarizer 8 in which the fourth light reflecting layer was formed from the first light reflecting layer was obtained.
  • the reflective circular polarizer 9 was formed so that the helical pitch of the second light reflecting layer varied continuously in the thickness direction. A pitch gradient layer with a gradient was formed. The first light-reflecting layer and the third light-reflecting layer were produced by the same production method as the reflective circular polarizer 1 . Formation of the pitch gradient layer was performed by the following procedure. After forming the first light reflecting layer on the rubbed PET film, the reflecting layer coating liquid R-6 was applied by a wire bar coater. Subsequently, heat aging was performed at 105° C. for 2 minutes to obtain a uniform orientation state. Thereafter, this coating film was held at 75° C.
  • a second light reflecting layer consisting of a cholesteric liquid crystal layer was formed. Light irradiation was performed from the cholesteric liquid crystal layer side. At this time, the coating thickness was adjusted so that the film thickness of the second light reflecting layer after curing was 7.0 ⁇ m.
  • the properties of the produced reflective circular polarizers 1 to 10 are shown in Table 4-1 below.
  • the characteristics of the produced reflective circular polarizers 11 to 13 are shown in Tables 4-2, 4-3 and 4-4 below, respectively.
  • the central wavelength of reflection (the central wavelength of reflected light) was confirmed by preparing a film in which only a single layer was applied.
  • the reflection center wavelength is used to define the properties of a light-reflecting film having a reflection band using cholesteric liquid crystals, and refers to the midpoint of the spectral band that the film reflects. Specifically, it was obtained by calculating the average value of the wavelength on the short wavelength side and the wavelength on the long wavelength side that show half the value of the peak reflectance by the method described above.
  • the absolute values of SRth i of the light reflecting layers of Reflective Circular Polarizer 1 and Reflective Circular Polarizers 4 to 11 were all 0.25 ⁇ m or less.
  • the absolute values of SRth i of the light reflecting layers of the reflective circular polarizers 12 and 13 were all 0.20 ⁇ m or less.
  • the Rth value was measured using AxoScan OPMF-1 (manufactured by Optoscience).
  • Table 4-1 Prepared reflective circular polarizers 1 to 10 (coating solution, film thickness) Table 4-2. Prepared reflective circular polarizer 11 (coating solution, film thickness) Table 4-3. Prepared reflective circular polarizer 12 (coating liquid, film thickness) Table 4-4. Prepared reflective circular polarizer 13 (coating liquid, film thickness)
  • a laminated optical film was produced by the following procedure.
  • a reverse dispersion retardation layer 1 was produced by referring to the method described in paragraphs 0151 to 0163 of JP-A-2020-084070.
  • a positive C plate 2 was produced in the same manner as the positive C plate 1, except that the film thickness was adjusted.
  • Matting agent solution ⁇ Silica particles with an average particle size of 20 nm (AEROSIL R972, manufactured by Nippon Aerosil Co., Ltd.) 2 parts by mass ⁇ Methylene chloride (first solvent) 76 parts by mass ⁇ Methanol (second solvent) 11 parts by mass ⁇
  • AEROSIL R972 manufactured by Nippon Aerosil Co., Ltd.
  • cellulose acylate film 1 After the core layer cellulose acylate dope and the outer layer cellulose acylate dope were filtered through a filter paper having an average pore size of 34 ⁇ m and a sintered metal filter having an average pore size of 10 ⁇ m, the core layer cellulose acylate dope and the outer layer cellulose acylate dope were formed on both sides thereof. 3 layers were simultaneously cast on a drum at 20° C. from a casting port (band casting machine). Next, the film was peeled off with a solvent content of approximately 20% by mass, fixed at both ends in the width direction of the film with tenter clips, and dried while being stretched in the horizontal direction at a draw ratio of 1.1. Thereafter, the film was further dried by transporting it between rolls of a heat treatment apparatus, and an optical film having a thickness of 40 ⁇ m was produced. The in-plane retardation of the obtained cellulose acylate film 1 was 0 nm.
  • a coating solution S-PA-1 for forming an orientation layer which will be described later, was continuously applied onto the cellulose acylate film 1 with a wire bar.
  • the support on which the coating film was formed was dried with hot air at 140° C. for 120 seconds, and then the coating film was irradiated with polarized ultraviolet rays (10 mJ/cm 2 , using an ultra-high pressure mercury lamp) to form a photo-alignment layer.
  • PA1 was formed.
  • the film thickness was 0.3 ⁇ m.
  • ⁇ Formation of light absorption anisotropic layer P1> The following coating solution SP-1 for forming a light absorption anisotropic layer was continuously coated on the alignment layer PA1 obtained by using a wire bar. Next, the coating layer P1 was heated at 140° C. for 30 seconds and cooled to room temperature (23° C.). Then, it was heated at 90° C. for 60 seconds and cooled again to room temperature. After that, an anisotropic light absorption layer P1 was formed on the alignment layer PA1 by irradiating for 2 seconds under irradiation conditions of an illuminance of 200 mW/cm 2 using an LED lamp (center wavelength 365 nm). The film thickness was 1.6 ⁇ m.
  • composition of Coating Liquid SP-1 for Forming Light Absorption Anisotropic Layer ⁇ ⁇ 0.25 parts by mass of the following dichroic substance D-1 ⁇ 0.36 parts by mass of the following dichroic substance D-2 ⁇ 0.59 parts by mass of the following dichroic substance D-3 ⁇
  • the following polymer liquid crystalline compound M -P-1 2.21 parts by mass 1.36 parts by mass of the following low-molecular liquid crystalline compound M-1
  • Polymerization initiator IRGACURE OXE-02 manufactured by BASF 0.200 parts by mass Surfactant F-1 below 0.026 parts by mass Cyclopentanone 46.00 parts by mass Tetrahydrofuran 46.00 parts by mass Benzyl alcohol 3.00 parts by mass ⁇ ⁇
  • the resulting reflective circular polarizer 1 was transferred to the support side of the positive C plate 1 thus obtained. At this time, the transfer was performed so that the layer (fourth light reflecting layer) on the side opposite to the temporary support side of the reflective circular polarizer 1 was on the positive C plate 1 side. The temporary support of the reflective circular polarizer 1 was removed by peeling after the transfer. The transfer of the reflective circular polarizer 1 was performed by the following procedure. (1) A UV adhesive Chemiseal U2084B (manufactured by Chemitec Co., Ltd., refractive index n1.60 after curing) was applied to the support side of the positive C plate 1 with a wire bar coater so as to have a thickness of 2 ⁇ m.
  • the reflecting circular polarizer 1 was laminated thereon with a laminator so that the opposite side of the temporary support of the reflective circular polarizer 1 was in contact with the UV adhesive.
  • the temporary support side of the reflective circular polarizer 1 was irradiated with ultraviolet light from a high-pressure mercury lamp to cure. The illuminance was 25 mW/cm 2 and the dose was 1000 mJ/cm 2 .
  • the temporary support of the reflective circular polarizer 1 was peeled off.
  • a positive C plate 2 was attached to the first light reflecting layer side of the reflective circular polarizer 1 .
  • the retardation layer 1 was attached to the positive C plate 2 .
  • the light absorption anisotropic layer P1 was transferred to the retardation layer 1 by the transfer procedure similar to that described above.
  • the slow axis of the retardation layer 1 and the absorption axis of the light absorption anisotropic layer P1 are laminated so that they form an angle of 45°, and the polarization axis of the light emitted from the retardation layer 1 and the light absorption anisotropy
  • the transmission axis of the optical layer P1 was made parallel.
  • a black and white checkered pattern is displayed on the image display panel of the virtual reality display device produced, and the ghost visibility (photographed image) is measured using a luminance meter (manufactured by Radiant Vision Systems, head-mounted display Using an image captured by an imaging color luminance meter IC-PMI16) with an AR/VR lens for evaluation, evaluation was made in the following two stages.
  • the virtual reality display devices of Examples 9 to 11 ghost visibility (photographed image) was not seen at all over the entire area of the lens.
  • the virtual reality display devices of Comparative Example 1 and Examples 1 to 8 light in the black display area of the checker pattern and part of the white display area was confirmed as a ghost in the captured image.
  • Example 12 to 15 A laminated optical film used in Example 12 was obtained in the same manner as in Example 1 except that the positive C plate 1 was not laminated in the procedure for obtaining the laminated optical film used in Example 1 above. Further, in the procedure for obtaining the laminated optical film used in Examples 9 to 11, the laminates used in Examples 13 to 15 were laminated in the same manner as in Examples 9 to 11, except that the positive C plate 1 was not laminated. An optical film was obtained. The laminated optical films used in Examples 12 to 15 were evaluated for ghost in the same manner as in each of the above Examples. Similar to 11.

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