WO2025004991A1 - 光学フィルム、レンズ、および仮想現実表示装置 - Google Patents

光学フィルム、レンズ、および仮想現実表示装置 Download PDF

Info

Publication number
WO2025004991A1
WO2025004991A1 PCT/JP2024/022546 JP2024022546W WO2025004991A1 WO 2025004991 A1 WO2025004991 A1 WO 2025004991A1 JP 2024022546 W JP2024022546 W JP 2024022546W WO 2025004991 A1 WO2025004991 A1 WO 2025004991A1
Authority
WO
WIPO (PCT)
Prior art keywords
optical film
optically anisotropic
layer
anisotropic layer
liquid crystal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2024/022546
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
直良 山田
克己 篠田
遊 内藤
竜二 実藤
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fujifilm Corp
Original Assignee
Fujifilm Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fujifilm Corp filed Critical Fujifilm Corp
Priority to CN202480043317.5A priority Critical patent/CN121420220A/zh
Priority to JP2025530086A priority patent/JPWO2025004991A1/ja
Publication of WO2025004991A1 publication Critical patent/WO2025004991A1/ja
Priority to US19/415,888 priority patent/US20260098991A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Images

Classifications

    • 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
    • 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
    • B32B1/00—Layered products having a non-planar shape
    • 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
    • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
    • G02B1/08—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of polarising materials
    • 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
    • G02B3/00—Simple or compound lenses
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G02B5/3083—Birefringent or phase retarding elements
    • 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
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K50/00—Organic light-emitting devices
    • H10K50/80—Constructional details
    • H10K50/85—Arrangements for extracting light from the devices
    • H10K50/858—Arrangements for extracting light from the devices comprising refractive means, e.g. lenses
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K50/00—Organic light-emitting devices
    • H10K50/80—Constructional details
    • H10K50/86—Arrangements for improving contrast, e.g. preventing reflection of ambient light
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/10—OLED displays

Definitions

  • the present invention relates to an optical film having a curved surface, a lens using this optical film, and a virtual reality display device using this lens.
  • a virtual reality display device is a display device that allows users to feel as if they are immersed in a virtual world by wearing a dedicated headset on their head and viewing images displayed through a composite lens.
  • a known virtual reality display device has an image display device and a Fresnel lens, but the distance from the image display device to the Fresnel lens is large, which makes the headset thick and makes it difficult to wear, which has been an issue.
  • a lens configuration of a composite lens called a pancake lens which has an image display device, a half mirror, a retardation layer, and a reflective polarizer, and lengthens the optical path and reduces the overall thickness of the headset by causing the light beam emitted from the image display device to travel back and forth between the half mirror and the reflective polarizer.
  • the reflective polarizer is a polarizer that has the function of reflecting one polarized light of incident light and transmitting the other polarized light.
  • the polarized light incident on the reflective polarizer is linearly polarized
  • the reflected light and the transmitted light are orthogonal linearly polarized lights
  • the polarized light incident on the reflective polarizer is circularly polarized
  • the reflected light and the transmitted light are circularly polarized lights with opposite rotation directions.
  • ⁇ linear polarizers that convert transmitted and reflected light into linearly polarized light
  • films made of stretched dielectric multilayers and wire grid polarizers are known examples.
  • reflective circular polarizers that convert transmitted and reflected light into circularly polarized light include cholesteric liquid crystal layers that have a light-reflecting layer in which a cholesteric liquid crystal phase is fixed.
  • Patent Document 1 discloses a method for laminating a laminated optical body onto a spherical or aspherical curved surface of an optical lens in order to obtain a wide field of view, low chromatic aberration, low distortion, and an excellent MTF (modulation transfer function).
  • MTF modulation transfer function
  • the amount of retardation expressed and the amount of change, etc. vary from place to place depending on the state of stretching.
  • the optically anisotropic layer is a retardation layer such as a ⁇ /4 retardation layer
  • the retardation of the optically anisotropic layer may become unintended due to the expression of undesirable retardation.
  • the optical axis of the optically anisotropic layer may change to an unintended direction.
  • optically anisotropic layers are layers that do not normally have a phase difference, such as a cholesteric liquid crystal layer.
  • a cholesteric liquid crystal layer which does not normally have a retardation
  • the optically anisotropic layer may develop a retardation due to stretching.
  • the reflected polarized light may become elliptically polarized light instead of the intended circularly polarized light.
  • the inventors' research has revealed that the occurrence of such undesirable phase difference and changes in phase difference disrupt the polarization of the light beam emitted from the image display device in a virtual reality display device that uses a pancake lens, causing some of the light beam to leak, leading to double images and reduced contrast.
  • Patent Document 1 discloses a virtual reality display device that uses a reflective linear polarizer as a reflective polarizer, and uses an image display panel and a composite lens having a pancake lens configuration with a reflective linear polarizer and a half mirror.
  • the image display panel, the reflective linear polarizer, and the half mirror are arranged in this order.
  • the reflective linear polarizer needs to have the action of a concave mirror with respect to the light beam incident from the half mirror side.
  • Patent Document 2 also discloses a virtual reality display device that uses a reflective linear polarizer as a reflective polarizer, and has an image display panel and a composite lens in a pancake lens configuration having a reflective linear polarizer and a half mirror.
  • the image display panel, the half mirror, and the reflective linear polarizer are arranged in this order.
  • Patent Document 2 proposes a configuration in which both the half mirror and the reflective linear polarizer are curved to improve the field curvature. At this time, the reflective linear polarizer needs to have the function of a convex mirror.
  • a retardation film between the reflective linear polarizer and the half mirror which converts circularly polarized light into linearly polarized light.
  • the retardation of the retardation film changes. As a result, it is found that the incident linearly polarized light cannot be appropriately reflected and transmitted, and the leakage light increases. In a virtual reality display device, when the leakage light increases, a ghost is visually recognized.
  • the present invention has been made in consideration of the above problems, and the problem that the present invention aims to solve is to provide an optical film that suppresses the occurrence of light leakage when applied to a pancake lens type virtual reality display device. Another object of the present invention is to provide a virtual reality display device that uses the above optical film.
  • An optical film having a curved surface The average radius of curvature of the curved surface is 30 to 1000 mm;
  • t_max When the maximum thickness of the optical film on the curved surface is t_max and the minimum thickness is t_min, (t_max-t_min)/t_min > R-1 Optical films that meet these requirements.
  • R is the ratio between the surface area of the curved surface and the projected area of the curved surface projected onto a plane perpendicular to the optical axis.
  • the optical film includes at least a retardation layer, and the retardation layer includes at least a first optically anisotropic layer and a second optically anisotropic layer;
  • the optical film according to [2] wherein the variation in the slow axis of each of the first optically anisotropic layer and the second optically anisotropic layer is less than 2°.
  • the reflective circular polarizer comprises a cholesteric liquid crystal layer.
  • a virtual reality display device having the lens according to [16].
  • the present invention provides an optical film that suppresses the occurrence of light leakage when applied to a virtual reality display device that uses a pancake lens.
  • the present invention also provides a virtual reality display device that uses the optical film.
  • FIG. 1 is a cross-sectional view conceptually illustrating an example of the optical film of the present invention.
  • FIG. 2 is a cross-sectional view conceptually showing another example of the optical film of the present invention.
  • FIG. 3 is a diagram for explaining an example of a method for forming an optical film of the present invention.
  • FIG. 4 is a top view of a planar optical film used in the molding method shown in FIG.
  • FIG. 5 shows an example of a pattern that is drawn on an optical film in order to investigate the in-plane variation of the optical properties of the optical film.
  • FIG. 6 is a diagram for explaining another example of the method for forming an optical film of the present invention.
  • FIG. 7 is a diagram conceptually showing an example of the virtual reality display device of the present invention.
  • FIG. 8 is a diagram conceptually showing another example of the virtual reality display device of the present invention.
  • liquid crystal composition and liquid crystalline compound conceptually include those that no longer exhibit liquid crystallinity due to curing or the like.
  • a numerical range expressed using “to” means a range that includes the numerical values before and after “to” as the lower and upper limits.
  • “orthogonal” does not mean strictly 90°, but means 90° ⁇ 10°, preferably 90° ⁇ 5°.
  • Parallel does not mean strictly 0°, but means 0° ⁇ 10°, preferably 0° ⁇ 5°.
  • “45°” does not mean strictly 45°, but means 45° ⁇ 10°, preferably 45° ⁇ 5°.
  • absorption axis refers to the polarization direction in which the absorbance is maximum in the plane when linearly polarized light is incident.
  • reflection axis refers to the polarization direction in which the reflectance is maximum in the plane when linearly polarized light is incident.
  • transmission axis refers to the direction perpendicular to the absorption axis or reflection axis in the plane.
  • slow axis refers to the direction in which the refractive index is maximum in the plane.
  • the phase difference means an in-plane retardation, and is expressed as Re( ⁇ ), unless otherwise specified.
  • Re( ⁇ ) represents an in-plane retardation at a wavelength ⁇
  • the wavelength ⁇ is 550 nm.
  • the retardation in the thickness direction at a wavelength ⁇ is referred to as Rth( ⁇ ) in this specification.
  • the wavelength ⁇ is 550 nm.
  • Re( ⁇ ) and Rth( ⁇ ) can be values measured at a wavelength ⁇ using, for example, AxoScan OPMF-1 (manufactured by Optosciences Inc.).
  • the terms "effective retardation” and “effective slow axis” refer to an effective in-plane retardation value calculated from a change in the polarization state for a specific polarized light, for example, in an optical film in which a plurality of optical films are laminated, and an effective slow axis direction calculated in a similar manner. Specifically, they can be obtained as follows. That is, using KOBRA 21ADH or WR (manufactured by Oji Scientific Instruments), linearly polarized light with a wavelength of ⁇ nm is incident in the normal direction of the optical film, and the light transmitted through the optical film is passed through an analyzer (a linear polarizer arranged at a predetermined angle) to measure the transmitted light intensity.
  • an analyzer a linear polarizer arranged at a predetermined angle
  • the effective in-plane retardation and effective slow axis orientation of the optical film are obtained by performing simulations from the transmitted light intensity measured by changing the relative angles of the optical film and the analyzer with respect to the direction of the incident linearly polarized light.
  • the wavelength selection filter can be replaced manually, or the measurement value can be converted by a program or the like.
  • the effective phase difference value can also be obtained using AxsoScan. Specifically, using AxsoScan, light with a wavelength of ⁇ nm is incident from the normal direction of the optical film, and the Mueller matrix of the optical film is obtained. Furthermore, from the obtained Mueller matrix, the polarization state of the emitted light when light of various polarization states is incident on the optical film can be obtained, and from the change in the polarization state, the in-plane retardation value of each optically anisotropic layer and the azimuth angle of the slow axis of each optically anisotropic layer can be obtained. From these values, the effective retardation value of the optical film can be obtained.
  • the optical film of the present invention has a curved surface.
  • the curved surface means a shape having a curvature exceeding 0, and includes a curved surface shape that is a developable surface and a three-dimensional curved surface shape.
  • a developable surface is a surface that can be developed on a plane without expanding or contracting each part of the surface. Examples of the shape of a developable curved surface include surfaces corresponding to cylindrical surfaces, elliptical cylindrical surfaces, conical surfaces, and elliptical conical surfaces, and may be convex or concave curved surfaces.
  • a three-dimensional curved surface means a curved surface that is not established by deformation of a plane, that is, a curved surface that is not a developable surface.
  • three-dimensional curved surfaces include surfaces corresponding to spherical surfaces and ellipsoidal surfaces, and surfaces corresponding to curved surfaces whose cross sections form parabolas and hyperbolas (for example, paraboloids of revolution).
  • a three-dimensional curved surface may be a convex or concave curved surface.
  • the curved surface is preferably lenticular.
  • lenticular curved surfaces include spherical and ellipsoidal shapes, and may be either convex or concave lenticular.
  • Preferred examples of the shape of the curved surface of the optical film of the present invention include a spherical shape, a spheroidal shape, and a paraboloidal shape.
  • the optical film of the present invention has a curved surface shape and exhibits a predetermined radius of curvature. That is, the portion of the optical film having a curved surface exhibits a predetermined radius of curvature.
  • the portion having a curved surface is a non-flat shaped portion, and preferably a curved shaped portion.
  • the average radius of curvature on the curved surface is from 30 to 1000 mm. If the average radius of curvature of the curved surface of the optical film is less than 30 mm, when the optical film is applied to a virtual reality display device or the like, the lens size becomes small, causing inconveniences such as poor wearing comfort.
  • the average radius of curvature of the curved surface of the optical film exceeds 1000 mm, when the optical film is made to function as a concave mirror, the focal length becomes large, resulting in a thick virtual reality display device and insufficient improvement in the field curvature, among other inconveniences.
  • the average radius of curvature of the curved surface of the optical film is preferably 30 to 100 mm.
  • the radius of curvature may be constant or may vary at any position on the optical film.
  • the "point where the occurrence of light leakage is further suppressed when the optical film is applied to a pancake lens type virtual reality display device" is also simply referred to as the "point where the effect of the present invention is more excellent.”
  • R is the ratio between the surface area of the curved surface and the projected area of the curved surface projected onto a plane perpendicular to the optical axis. Specifically, R is defined by the following formula (2).
  • Equation (2) surface area of curved surface / projected area of the curved surface projected onto a plane perpendicular to the optical axis
  • the "projected area of the curved surface projected onto a plane perpendicular to the optical axis" is also referred to as the "projected area of the curved surface.”
  • the projected area of the curved surface is, in other words, the projected area when the curved surface is projected onto a plane perpendicular to the normal line of the curved surface at the bottom (i.e., the top) of the curved surface.
  • the optical axis is the normal line of the curved surface at the bottom of the curved surface. Therefore, when the optical film of the present invention is attached (adhered) to an optical element having an optical axis such as a lens, the optical axis of the optical element and the optical axis of the optical film of the present invention usually coincide with each other. Note that, when the optical film of the present invention having a curved surface has an optically clear optical axis as an optical element such as a lens, this optical axis is the optical axis of the optical film of the present invention.
  • the optical film of the present invention has a curved surface, and the curved surface has a film thickness distribution.
  • the optical film of the present invention has a film thickness distribution in which the curved surface is thickest at the end and gradually becomes thinner toward the bottom, with the bottom being the thinnest, as in optical film 10 conceptually shown in Fig. 1.
  • the optical film of the present invention has a film thickness distribution in which the curved surface is thinnest at the end and gradually becomes thicker toward the bottom, with the bottom being the thickest, as in optical film 12 conceptually shown in Fig. 2.
  • FIG. 1 and 2 are schematic diagrams showing a cross section of an example of the optical film of the present invention cut along a straight line passing through the bottom of a curved surface, that is, the optical axis. According to the studies of the present inventors, it has been found that when an optical film having a curved surface satisfies formula (1), the variation in optical performance on the curved surface of the optical film can be reduced.
  • the optical film of the present invention when the maximum thickness on the curved surface is t_max and the minimum thickness is t_min, t_max and t_min are Formula (1) (t_max-t_min)/t_min>R-1 That is, the optical film of the present invention has a relatively large film thickness distribution on the curved surface, and the larger R obtained by dividing the surface area of the curved surface by the projected area of the curved surface, that is, the larger the curvature of the curved surface, the larger the film thickness distribution.
  • the optical film of the present invention having such a film thickness distribution is isotropically stretched when molded into a curved shape, and thus, even though it has a curved surface, it is possible to reduce the variation in optical performance on the curved surface. Therefore, when the optical film of the present invention is used in, for example, a pancake lens type virtual reality display device, the occurrence of leaked light is suppressed, and it becomes possible to display a virtual reality image with less ghosting.
  • the maximum thickness t_max and the minimum thickness t_min on the curved surface are measured as follows.
  • the projected image when measuring the projected area of the curved surface described above three equally spaced concentric circles are set around the optical axis (bottom) between the optical axis and the end of the curved surface, as conceptually shown in Fig. 5. If the outer shape of the projected image of the curved surface is not circular, the largest circle inscribed in the outer shape of the projected image is set, and this circle is regarded as the outer shape of the curved surface, and three equally spaced concentric circles are set. Next, four straight lines passing through the optical axis (bottom) are set at 45° intervals in the azimuth direction.
  • the thickness of the curved surface is the thickness in the normal direction of the curved surface at the measurement point.
  • the thickness of the optical film may be measured, for example, by cutting the optical film vertically (in the normal direction of the curved surface) and observing the cross section with an optical microscope and a scanning electron microscope (SEM). From the thickness measurement results at the 33 measurement points thus measured, the maximum thickness is determined as the maximum thickness on the curved surface t_max, and the minimum thickness is determined as the minimum thickness on the curved surface t_min.
  • (t_max-t_min)/t_min is R-1 or less, the film thickness distribution is insufficient, and for example, when the optical film of the present invention is used in a virtual image display device, it is not possible to sufficiently suppress leakage light, double images are generated, contrast is reduced, and other inconveniences arise.
  • (t_max-t_min)/t_min is preferably 1.5 ⁇ (R ⁇ 1) or greater, and more preferably 2.0 ⁇ (R ⁇ 1) or greater. Although there is no upper limit to (t_max-t_min)/t_min, it is usually 5.0 ⁇ (R-1) or less.
  • the optical film of the present invention can be used in various optical components such as retardation films, absorptive polarizers, reflective linear polarizers, and reflective circular polarizers.
  • the optical film of the present invention may be a retardation layer.
  • the retardation layer preferably includes at least a first optically anisotropic layer and a second optically anisotropic layer.
  • the variation of t1(x)/t2(x) on the curved surface is preferably less than 5%, more preferably less than 3%.
  • the variation of t1(x)/t2(x) on the curved surface is within the above range, the variation of the effective in-plane retardation of the retardation layer can be reduced, which is preferable.
  • the variation of the effective in-plane retardation is preferably less than 5%, more preferably less than 3%, from the viewpoint of reducing the leakage light of the virtual reality display device.
  • the variation of t1(x)/t2(x) on the curved surface is within the above range, when the effective slow axis direction of the retardation layer is projected onto a plane perpendicular to the optical axis of the curved surface, the variation of the projected slow axis direction can be reduced, which is preferable.
  • the variation in the slow axis orientation is also small.
  • the variation in the slow axis orientation is preferably less than 2°, and more preferably less than 1°.
  • the variation in the slow axis of each of the first optically anisotropic layer and the second optically anisotropic layer is preferably less than 2°, and more preferably less than 1°.
  • the retardation layer has a first retardation layer and a second retardation layer
  • the first optically anisotropic layer has an effective in-plane retardation value in the range of 120 nm to 160 nm at a wavelength of 550 nm
  • the second optically anisotropic layer has an effective in-plane retardation value of 200 to 320 nm.
  • the angle between the direction of the slow axis of the first optically anisotropic layer and the direction of the slow axis of the second optically anisotropic layer is 60° ⁇ 10°.
  • the retardation layer can have an effective in-plane retardation of ⁇ /4 retardation over a wide wavelength range of visible light, and can convert linearly polarized light into circularly polarized light over the same wavelength range. Similarly, it can convert circularly polarized light into linearly polarized light.
  • the retardation layer has a first retardation layer and a second retardation layer
  • first optical anisotropic layer or the second optical anisotropic layer has reverse wavelength dispersion
  • both the first optical anisotropic layer and the second optical anisotropic layer have reverse wavelength dispersion.
  • the reverse wavelength dispersion property means that when the in-plane retardation (Re) value is measured at a specific wavelength (visible light range), the Re value increases as the measured wavelength increases.
  • An optically anisotropic layer having reverse wavelength dispersion properties can be produced by uniaxially stretching a polymer film such as a modified polycarbonate resin film having reverse wavelength dispersion properties, for example, with reference to JP-A-2017-049574.
  • an optically anisotropic layer having reverse wavelength dispersion can also be produced by orienting and fixing a rod-shaped liquid crystal compound having reverse wavelength dispersion, for example, with reference to JP-A-2020-084070.
  • the retardation layer has a first retardation layer and a second retardation layer
  • at least one of the first optically anisotropic layer and the second optically anisotropic layer is a layer in which a liquid crystal compound is fixed in a twisted orientation with the thickness direction as a helical axis.
  • the retardation layer can have an effective in-plane retardation of ⁇ /4 over a wide wavelength range of visible light, and can convert linearly polarized light into circularly polarized light over a wide wavelength range of visible light. Similarly, it can convert circularly polarized light into linearly polarized light.
  • the first optically anisotropic layer and the second optically anisotropic layer of the retardation layer are preferably layers that at least fix a liquid crystal compound.
  • the liquid crystal compound can align liquid crystal molecules in any direction using an alignment film or the like, so that the manufacturing process of the retardation layer can be simplified.
  • the alignment direction of the liquid crystal compound contained in the first optically anisotropic layer and the alignment direction of the liquid crystal compound contained in the second optically anisotropic layer are continuous at the interface between the first optically anisotropic layer and the second optically anisotropic layer.
  • the alignment direction of the liquid crystal compound is continuous at the interface means that the in-plane slow axis of the first optically anisotropic layer on the surface facing the second optically anisotropic layer is parallel to the in-plane slow axis of the second optically anisotropic layer on the surface facing the first optically anisotropic layer. That is, when the alignment direction of the liquid crystal compound is continuous at the interface, the angle between the in-plane slow axis of the first optically anisotropic layer on the surface facing the second optically anisotropic layer and the in-plane slow axis of the second optically anisotropic layer on the surface facing the first optically anisotropic layer is within 10° (0 to 10°).
  • the retardation layer has a first retardation layer and a second retardation layer
  • the retardation layer is preferably a layer in which the first optically anisotropic layer is a positive A plate and the second optically anisotropic layer is a layer in which a liquid crystal compound is fixed in a twisted orientation with the thickness direction as a helical axis.
  • the positive A plate is a retardation layer in which Re has a value and Rth has a value that is substantially 1/2 of Re.
  • the positive A plate can be obtained, for example, by horizontally aligning a rod-shaped liquid crystal compound.
  • the alignment direction of the liquid crystal compound contained in the first optically anisotropic layer and the alignment direction of the liquid crystal compound contained in the second optically anisotropic layer are continuous at the interface between the first optically anisotropic layer and the second optically anisotropic layer. It is preferable that the product of the refractive index anisotropy ⁇ n1 at a wavelength of 550 nm and the thickness d1 of the first optically anisotropic layer satisfies the following formula (3).
  • the product of the refractive index anisotropy ⁇ n2 at a wavelength of 550 nm and the thickness d2 of the second optically anisotropic layer satisfies the following formula (4).
  • the second optically anisotropic layer is preferably a layer in which a liquid crystal compound is fixed and twisted and aligned with the thickness direction as the helical axis, and the twist angle is preferably 85 ⁇ 20°.
  • the retardation layer can be a ⁇ /4 retardation layer in a wider wavelength range.
  • the retardation layer as described above can refer to, for example, the one disclosed in International Publication No. 2021/261435.
  • the retardation layer has a first retardation layer and a second retardation layer
  • the retardation layer is preferably a layer in which the first optically anisotropic layer and the second optically anisotropic layer are fixed with a liquid crystal compound that is twisted and aligned with the thickness direction as the helical axis.
  • the helical pitch of the first optically anisotropic layer is different from the helical pitch of the second optically anisotropic layer.
  • the alignment direction of the liquid crystal compound contained in the first optically anisotropic layer and the alignment direction of the liquid crystal compound contained in the second optically anisotropic layer are continuous at the interface between the first optically anisotropic layer and the second optically anisotropic layer.
  • the product of the refractive index anisotropy ⁇ n1 at a wavelength of 550 nm and the thickness d1 of the first optically anisotropic layer satisfies the following formula (5).
  • the first optically anisotropic layer is preferably a layer in which a liquid crystal compound is fixed and twisted and aligned with the thickness direction as the helical axis, and the twist angle is preferably 26.5 ⁇ 10°.
  • the product of the refractive index anisotropy ⁇ n2 at a wavelength of 550 nm and the thickness d2 satisfies the following formula (6).
  • the second optically anisotropic layer is preferably a layer in which a liquid crystal compound is fixed and twisted and aligned with the thickness direction as the helical axis, and the twist angle is preferably 78.6 ⁇ 10°.
  • the retardation layer can be a ⁇ /4 retardation layer in a wider wavelength range.
  • the retardation layer as described above can refer to, for example, the one disclosed in International Publication No. 2021/261435. Also preferred is an embodiment in which both the first optically anisotropic layer and the second optically anisotropic layer are positive A plates.
  • the first optically anisotropic layer and the second optically anisotropic layer may be produced in separate steps and then laminated together.
  • the lamination can be performed using an adhesive such as an adhesive or a pressure sensitive adhesive.
  • the adhesive layer between each layer is refractive index matched with the first optically anisotropic layer and the second optically anisotropic layer.
  • the thickness of the adhesive layer can also be set appropriately so as to suppress interface reflection with the first optically anisotropic layer and the second optically anisotropic layer.
  • 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.
  • An example of a method for forming an adhesive layer having a thickness of 100 nm or less is a method for depositing a ceramic adhesive such as silicon oxide (SiOx layer) on the adhesive surface.
  • the adhesive surface may be subjected to a surface modification treatment such as plasma treatment, corona treatment, and saponification treatment before bonding, and a primer layer may be applied.
  • the type and thickness of the adhesive layer can be adjusted for each adhesive surface.
  • an adhesive layer having a thickness of 100 nm or less can be provided by the following steps (1) to (3).
  • the layers to be laminated are attached to a temporary support made of a glass substrate.
  • a SiOx layer having a thickness of 100 nm or less is formed by deposition or the like.
  • the deposition can be performed using, for example, a deposition device (model number ULEYES) manufactured by ULVAC, Inc., using SiOx powder as a deposition source. It is also preferable to subject the surface of the formed SiOx layer to a plasma treatment.
  • the temporary support is peeled off. The bonding is preferably performed at a temperature of, for example, 120°C.
  • the application of adhesives and pressure sensitive adhesives to each layer, the formation of adhesive layers such as SiOx layers, and adhesion may be performed by roll-to-roll or sheet-by-sheet.
  • the roll-to-roll method is preferable in terms of improving productivity and reducing axial misalignment of layers.
  • the single-wafer system is preferable in that it is suitable for small-lot, high-mix production, and that a special bonding method can be selected such that the thickness of the adhesive layer described above is 100 nm or less.
  • examples of methods for applying the adhesive and pressure-sensitive adhesive to the substrate include known methods such as roll coating, gravure printing, spin coating, wire bar coating, extrusion coating, direct gravure coating, reverse gravure coating, die coating, spraying, and inkjet methods.
  • the retardation layer has a first retardation layer and a second retardation layer
  • the adhesive layer can be eliminated by directly coating the layer on the adjacent layer that has already been formed.
  • the adhesive layer can be eliminated by directly coating the composition that will become the second optically anisotropic layer on the first optically anisotropic layer that has already been formed.
  • the alignment direction of the liquid crystal compounds change continuously at the interface.
  • the composition for forming the second optically anisotropic layer containing liquid crystal compounds is directly applied to the first optically anisotropic layer containing liquid crystal compounds, and the alignment direction of the liquid crystal compounds in the second optically anisotropic layer can be aligned continuously at the interface by the alignment control force of the liquid crystal compounds in the first optically anisotropic layer.
  • the retardation layer has a first retardation layer and a second retardation layer
  • the first optically anisotropic layer and the second optically anisotropic layer can be formed by coating the same forming composition and then separating them into two layers by various methods, and forming them into the first optically anisotropic layer and the second optically anisotropic layer, respectively.
  • Such a retardation layer can be produced, for example, by the following steps 1 to 5.
  • Step 1 A step of applying a polymerizable liquid crystal composition containing a chiral agent including at least a photosensitive chiral agent whose helical twisting power changes upon irradiation with light, and a liquid crystal compound having reverse wavelength dispersion and a polymerizable group, onto a support to form a composition layer (Note that in the following explanation of Steps 2 to 5, the "liquid crystal compound having reverse wavelength dispersion and a polymerizable group" is also simply referred to as the "liquid crystal compound”).
  • Step 2 A step of subjecting the composition layer to a heat treatment to align the liquid crystal compound in the composition layer.
  • Step 3 After step 2, a step of irradiating the composition layer with light under conditions of an oxygen concentration of 1% by volume or more.
  • Step 4 After step 3, a step of subjecting the composition layer to a heat treatment.
  • Step 5 After step 4, a step of subjecting the composition layer to a curing treatment to fix the alignment state of the liquid crystal compound and form a first optically anisotropic layer and a second optically anisotropic layer.
  • the above-mentioned retardation layer production process can refer to, for example, the process disclosed in International Publication No. 2021/261435.
  • the retardation layer includes a further optically anisotropic layer in addition to the first optically anisotropic layer and the second optically anisotropic layer.
  • a further optically anisotropic layer in addition to the first optically anisotropic layer and the second optically anisotropic layer.
  • Inclusion of three or more optically anisotropic layers is preferable because it increases the degree of freedom in designing the retardation layer and makes it easier to achieve an effective in-plane retardation of ⁇ /4 retardation over a wide wavelength range of visible light.
  • the optical film of the present invention may be an absorptive polarizer, which absorbs linearly polarized light in the absorption axis direction of incident light and transmits linearly polarized light in the transmission axis direction.
  • the variation in the orientation of the projected absorption axis is preferably less than 2°, and more preferably less than 1°.
  • a general polarizer can be used as the absorptive polarizer.
  • a polarizer in which a dichroic material is dyed onto polyvinyl alcohol or other polymer resin and then stretched to be oriented may be used, or a polarizer in which a dichroic material is oriented by utilizing the orientation of a liquid crystal compound may be used.
  • a polarizer in which polyvinyl alcohol is dyed with iodine and then stretched is preferred.
  • the thickness of the absorptive polarizer is preferably 10 ⁇ m or less, more preferably 7 ⁇ m or less, and even more preferably 5 ⁇ m or less.
  • the single plate transmittance of the absorptive polarizer is preferably 40% or more, and 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 degree of polarization of the absorptive 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 absorptive polarizer preferably coincides with the direction of the polarization axis of the light converted into linearly polarized light by the retardation layer.
  • the angle between the transmission axis of the absorptive polarizer and the slow axis of the retardation layer is preferably about 45°.
  • the absorptive polarizer is also preferably a light absorbing anisotropic layer containing a liquid crystal compound and a dichroic substance.
  • the absorptive polarizer containing a liquid crystal compound and a dichroic substance is preferable because it can be thinned and is unlikely to crack or break even when stretched or molded.
  • the thickness of the optically absorptive anisotropic layer is not particularly limited, but from the viewpoint of achieving a thin film, it is preferably from 0.1 to 8 ⁇ m, and more preferably from 0.3 to 5 ⁇ m.
  • An absorptive polarizer containing a liquid crystal compound and a dichroic substance can be produced, for example, by referring to JP 2020-023153 A. From the viewpoint of improving the polarization degree of the absorptive polarizer, the light absorption anisotropic layer preferably has an orientation degree of the dichroic substance of 0.95 or more, more preferably 0.97 or more.
  • the absorptive polarizer be transparent to near-infrared light.
  • the optical film of the present invention may be a reflective linear polarizer.
  • the variation in the orientation of the projected reflection axis is preferably less than 2°, and more preferably less than 1°.
  • the reflective linear polarizer for example, a film obtained by stretching a dielectric multilayer film, a wire grid polarizer, or the like can be used.
  • the optical film of the present invention may be a reflective circular polarizer, for example, a cholesteric liquid crystal layer can be used as the reflective circular polarizer.
  • the cholesteric liquid crystal layer is an optical member that separates incident light into right-handed circularly polarized light and left-handed circularly polarized light, specularly reflects one of the circularly polarized light, and transmits the other circularly polarized light.
  • a cholesteric liquid crystal layer formed by fixing a cholesteric liquid crystal phase can be used, referring to JP 2020-060627 A.
  • a film formed by fixing a cholesteric liquid crystal phase is preferable because it has a high degree of polarization of transmitted light despite being a thin film.
  • the cholesteric liquid crystal layer is preferable as a film to be used for curved surface molding, from the viewpoint that a decrease in the degree of polarization and/or a distortion of the polarization axis is suppressed when the layer is stretched or molded into a three-dimensional shape, etc. In addition, a decrease in the degree of polarization caused by a distortion of the polarization axis is unlikely to occur.
  • the cholesteric liquid crystal layer preferably has a blue light reflecting layer having a reflectance of 40% or more for light with a wavelength of 460 nm, a green light reflecting layer having a reflectance of 40% or more for light with a wavelength of 550 nm, a yellow light reflecting layer having a reflectance of 40% or more for light with a wavelength of 600 nm, and a red light reflecting layer having a reflectance of 40% or more for light with a wavelength of 650 nm.
  • This configuration is preferable because it is possible to exhibit high reflectance characteristics over a wide wavelength range in the visible region. Note that the above reflectances are those when unpolarized light of each wavelength is incident on the cholesteric liquid crystal layer.
  • the blue light reflective layer, the green light reflective layer, the yellow light reflective layer, and the red light reflective layer formed by fixing the cholesteric liquid crystal phase may have a pitch gradient layer in which the helical pitch of the cholesteric liquid crystal phase is continuously changed in the thickness direction.
  • the green light reflective layer and the yellow light reflective layer can be continuously produced.
  • the cholesteric liquid crystal layer has a light-reflecting layer formed by fixing a cholesteric liquid crystal phase containing a rod-shaped liquid crystal compound, and a light-reflecting layer formed by fixing a cholesteric liquid crystal phase containing a discotic liquid crystal compound.
  • the cholesteric liquid crystal phase containing the rod-shaped liquid crystal compound has a positive Rth
  • the cholesteric liquid crystal phase containing the discotic liquid crystal compound has a negative Rth, and therefore the Rths are offset to each other, thereby making it possible to suppress the occurrence of ghosts even when light is incident from an oblique direction, which is preferable.
  • Rth is offset
  • SRthn Rth1+Rth2...+Rthi...+Rthn
  • the absolute value of all of these SRthi is preferably 0.3 ⁇ m or less, more preferably 0.2 ⁇ m or less, and further preferably 0.1 ⁇ m or less.
  • the Rthi of each layer in the above formula is calculated by the above-mentioned formula for calculating Rth.
  • the thickness of the cholesteric liquid crystal layer is not particularly limited, but from the viewpoint of achieving a thin film, it is preferably 30 ⁇ m or less, and more preferably 15 ⁇ m or less.
  • the reflection wavelength range of the cholesteric liquid crystal layer may shift, so it is preferable to select the reflection wavelength range in advance, assuming the shift in wavelength.
  • the film may be stretched by stretching or molding, and the helical pitch of the cholesteric liquid crystal phase may become small, so it is preferable to set the helical pitch of the cholesteric liquid crystal phase large in advance.
  • the cholesteric liquid crystal layer has an infrared light reflective layer with a reflectance of 40% or more at a wavelength of 800 nm.
  • an appropriate reflection wavelength range may be selected in each location in the plane according to the wavelength shift caused by stretching. That is, there may be areas in the plane with different reflection wavelength ranges. It is also preferable to set the reflection wavelength range wider than the required wavelength range in advance, assuming that the stretching ratio will be different in each location in the plane.
  • the cholesteric liquid crystal layer can be formed by applying a liquid crystal composition, in which a liquid crystal compound, a chiral agent, and a polymerization initiator, and further, if necessary, a surfactant, etc. are dissolved in a solvent, onto a support or onto an underlayer formed on a support, drying the composition to obtain a coating film, orienting the liquid crystal compound in the coating film, and irradiating the coating film with active light rays to harden the liquid crystal composition.
  • a liquid crystal composition in which a liquid crystal compound, a chiral agent, and a polymerization initiator, and further, if necessary, a surfactant, etc. are dissolved in a solvent, onto a support or onto an underlayer formed on a support, drying the composition to obtain a coating film, orienting the liquid crystal compound in the coating film, and irradiating the coating film with active light rays to harden the liquid crystal composition.
  • Examples of methods for applying the liquid crystal composition include known methods such as roll coating, gravure printing, spin coating, wire bar coating, extrusion coating, direct gravure coating, reverse gravure coating, die coating, spraying, and inkjet methods.
  • Method of imparting in-plane distribution to helical pitch As a method for imparting an in-plane distribution to the helical pitch of a cholesteric liquid crystal layer, for example, there is a method using a chiral agent whose helical twisting power (HTP) changes upon photoisomerization.
  • HTP helical twisting power
  • a liquid crystal composition containing a chiral agent whose HTP changes upon photoisomerization is applied (and in some cases subsequently heated) to an aligned cholesteric liquid crystal layer, which is then irradiated with light corresponding to the photoisomerization.
  • This changes the HTP of the chiral agent which in turn changes the helical pitch of the cholesteric liquid crystal layer, making it possible to change the reflected wavelength.
  • a pattern of light irradiation is performed using an exposure mask or the like on the aligned cholesteric liquid crystal layer to cause photoisomerization, thereby obtaining a pattern in which the reflected wavelength is changed only in the light-irradiated area.
  • the entire cholesteric liquid crystal layer is exposed to light in order to harden the liquid crystal composition, and the liquid crystal composition is polymerized, thereby finally obtaining a cholesteric liquid crystal layer having an in-plane distribution of helical pitch (patterned cholesteric liquid crystal layer).
  • the patterned cholesteric liquid crystal layer no longer undergoes photoisomerization and has stable properties.
  • the light irradiation for photoisomerization and the light irradiation for curing are separated.
  • distinction based on oxygen concentration and distinction based on exposure wavelength can be given.
  • photoisomerization of the chiral agent occurs at the absorption wavelength of the chiral agent, while hardening occurs at the absorption wavelength of the photopolymerization initiator. Therefore, if the chiral agent and photopolymerization initiator are selected so that they have different absorption wavelengths, it will be possible to distinguish between photoisomerization and hardening depending on the exposure wavelength.
  • either or both of the photoisomerization and curing may be performed under heating.
  • the heating temperature is preferably 25 to 140°C, and more preferably 30 to 100°C.
  • the agent is first cured in a pattern and then the uncured regions are isomerized. That is, the aligned cholesteric liquid crystal phase is first irradiated with light for curing in a pattern using an exposure mask or the like.
  • the previously cured regions can no longer undergo pitch change due to photoisomerization. Therefore, by subsequently irradiating the entire surface with light for photoisomerization, a pitch change due to photoisomerization occurs only in the previously uncured regions, and a change in the reflected wavelength occurs.
  • the entire cholesteric liquid crystal layer is exposed to light for hardening the liquid crystal composition, and the liquid crystal composition is polymerized, thereby obtaining the final patterned cholesteric liquid crystal layer.
  • the optical film of the present invention may be a laminated optical body in which a plurality of functional layers are laminated.
  • the laminated optical body as the optical film of the present invention may have at least one functional layer which is the optical film of the present invention, but the more the optical film of the present invention, the better, and all of the optical films of the present invention may be the optical films of the present invention.
  • the functional layer include a retardation layer, a reflective linear polarizer, a reflective circular polarizer, and an absorptive polarizer.
  • the laminated optical body may also include different functional layers to further improve the optical effect.
  • the positive C plate is a retardation layer having a substantially zero Re and a negative Rth.
  • the positive C plate can be obtained, for example, by vertically aligning a rod-shaped 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 may be disposed at any position in the laminated optical body, and a plurality of positive C plates may be disposed.
  • the positive C plate may be disposed adjacent to the retardation layer or inside the retardation layer.
  • the retardation layer has a positive retardation Rth (retardation in the thickness direction).
  • the retardation Rth may change the polarization state of the transmitted light, and the polarization degree of the transmitted light may decrease.
  • a positive C plate is provided inside or near the retardation layer, it is preferable because it can suppress the change in the polarization state of the obliquely incident light and suppress the decrease in the polarization degree of the transmitted light.
  • the positive C plate is preferably disposed on the side opposite to the linear polarizer with respect to the retardation layer, but may be disposed in other places.
  • the in-plane retardation Re of the positive C plate is preferably about 10 nm or less, and the retardation Rth is preferably ⁇ 120 nm to ⁇ 20 nm, more preferably ⁇ 90 nm to ⁇ 40 nm.
  • the laminated optical body may further include a support.
  • the support can be placed at any location.
  • the support can be used as the transfer destination.
  • the type of the support is not particularly limited, but is preferably transparent, and for example, films such as cellulose acylate, polycarbonate, polysulfone, polyethersulfone, polyacrylate and polymethacrylate, cyclic polyolefin, polyolefin, polyamide, polystyrene, and polyester can be used. Among them, cellulose acylate film, cyclic polyolefin film, polyacrylate film, and polymethacrylate film are preferred.
  • the support preferably has a small phase difference from the viewpoint of suppressing adverse effects on the polarization degree of transmitted light and from the viewpoint of facilitating optical inspection of the laminated optical body.
  • the support preferably has an in-plane retardation Re of 10 nm or less and an absolute value of retardation Rth of 50 nm or less.
  • the support When the laminated optical body is to be stretched or molded, the support preferably has a peak temperature of tan ⁇ 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, and more preferably 130° C. or lower.
  • E" loss modulus
  • E' storage modulus
  • Sample 5 mm, length 50 mm (gap 20 mm) Measurement conditions: Tensile mode Measurement temperature: -150°C to 220°C Temperature rise condition: 5° C./min Frequency: 1Hz
  • a resin substrate that has been subjected to a stretching treatment is often used, and the peak temperature of tan ⁇ is often high due to the stretching treatment.
  • the peak temperature of tan ⁇ of a TAC (triacetyl cellulose) substrate is 180° C. or higher.
  • An example of a TAC substrate is TG40 manufactured by Fujifilm Corporation.
  • various resin substrates can be used without any particular limitation.
  • examples of such supports include polyolefins such as polyethylene, polypropylene, and norbornene-based polymers; cyclic olefin-based resins; polyvinyl alcohol; polyethylene terephthalate; acrylic resins such as polymethacrylic acid esters and polyacrylic acid esters; polyethylene naphthalate; polycarbonate; polysulfone; polyethersulfone; polyetherketone; polyphenylene sulfide, and polyphenylene oxide.
  • cyclic olefin-based resins preferred are cyclic olefin-based resins, polyethylene terephthalate, and acrylic resins, and particularly preferred are cyclic olefin-based resins and polymethacrylic acid esters.
  • resin substrates include Technoloy S001G, Technoloy S014G, Technoloy S000, Technoloy C001 and Technoloy C000 (Sumika Acrylic Sales Co., Ltd.), Lumirror U Type, Lumirror FX10 and Lumirror SF20 (Toray Industries, Inc.), HK-53A (Higashiyama Films Co., Ltd.), Teflex FT3 (Teijin DuPont Films Co., Ltd.), S-Cina” and SCA40 (Sekisui Chemical Co., Ltd.), Zeonor Film (Optes Co., Ltd.), and Arton Film (JSR Corporation).
  • the thickness of the support is not particularly limited, but is preferably 5 to 300 ⁇ m, more preferably 5 to 100 ⁇ m, and even more preferably 5 to 30 ⁇ m.
  • the method for producing the optical film having the above-mentioned curved surface is not particularly limited.
  • the optical film molding method of the present invention preferably includes the steps of heating an optical film having a planar shape, pressing the heated optical film against a mold to deform it according to the shape of the mold, and cutting the optical film. Each step will be described in detail below.
  • the optical film used in this process is an optical film having a flat shape, as described below, and a predetermined shape is transferred to it by a mold (molding die), thereby obtaining the optical film of the present invention having the above-mentioned curved surface.
  • the optical film having a planar shape includes various members that may be included in the optical film having the above-mentioned curved surface, such as a retardation film, etc. However, the various members included in the optical film having a planar shape have a planar shape.
  • Methods for heating an optical film having a planar shape include heating by contact with a heated solid, heating by contact with a heated liquid, heating by contact with a heated gas, heating by irradiating with infrared rays, and heating by irradiating with microwaves.
  • heating by infrared irradiation is preferred, which allows heating to be performed remotely immediately before molding of the optical film.
  • the wavelength of the infrared rays used for heating is preferably 1.0 to 30.0 ⁇ m, and more preferably 1.5 to 5 ⁇ m.
  • a near-infrared lamp heater having a tungsten filament sealed in a quartz tube a wavelength control heater having multiple quartz tubes and a mechanism for cooling some of the spaces between the quartz tubes with air, or the like can be used.
  • the physical properties during molding can be controlled according to the purpose.
  • Methods of providing an intensity distribution include a method of varying the density of the arrangement of IR light sources, and a method of placing a filter with a patterned transmittance for infrared light between the IR light source and the optical film.
  • filters with a patterned transmittance include a filter in which a metal is vapor-deposited on glass, a filter in which the reflection band of a cholesteric liquid crystal layer is made infrared, a filter in which the reflection band is made infrared by a dielectric multilayer film, and a filter coated with ink that absorbs infrared light.
  • the temperature of the optical film is controlled by the intensity of infrared irradiation.
  • the temperature of the optical film is controlled by the infrared irradiation time and/or the illuminance of the infrared irradiation.
  • the temperature of the optical film is controlled by the infrared irradiation time and/or the illuminance of the infrared irradiation.
  • One form of molding apparatus used in this process consists of box 1 having an opening at the top and box 2 having an opening at the bottom, and in order to form a molding space, the openings of box 1 and box 2 are brought together directly or via another jig to form a sealed molding space.
  • a mold having a shape corresponding to the shape (curved surface) of the optical film after molding and a film to be molded are placed in the molding space.
  • the mold may be an adherend such as a lens to which the optical film of the present invention is attached (attached).
  • the film to be formed acts as a partition to divide the forming space consisting of box 1 and box 2 into two spaces.
  • the mold is placed on the box 1 side below the film to be formed.
  • the molding device is provided with a plurality of heating elements for heating the film to be molded, which may be disposed either inside the molding space or outside the molding space and irradiate the film to be molded with heat through a transparent window.
  • Step of Cutting Optical Film Methods for cutting the molded optical film into a desired shape include, for example, methods using a cutter, scissors, a cutting plotter, a laser cutter, or the like.
  • the optical film of the present invention has a curved surface, and the film thickness of the optical film on the curved surface has a film thickness distribution that satisfies the above-mentioned formula (1).
  • the optical film of the present invention has small variations in optical properties on a curved surface.
  • the optical film of the present invention has an in-plane variation in optical properties of less than 5%.
  • molding can be performed so that the flat optical film is stretched isotropically in the plane.
  • a planar optical film is molded so that the ratio of the stretching ratio in the diameter direction to the stretching ratio in the circumferential direction is in the range of 0.95 to 1.05. This makes it possible to increase the distribution of the film thickness in the optical film after molding.
  • the optical film has a retardation (effective retardation) and a slow axis (effective slow axis)
  • the variation in the orientation of the slow axis after molding can be reduced.
  • the optical film includes a first optically anisotropic layer and a second optically anisotropic layer
  • the variation in the effective in-plane retardation after molding can be reduced.
  • the ratio of the stretching ratio in the diameter direction to the stretching ratio in the circumferential direction is more preferably in the range of 0.98 to 1.02.
  • the molding method is a molding method for an optical film, which includes the steps of heating the optical film having a planar shape described above, pressing the heated optical film against a mold (adherend) and deforming it to conform to the shape of the mold, and cutting the deformed optical film, in which the heating step is a step of heating the optical film by irradiating it with infrared rays, and the amount of infrared radiation has a distribution within the surface of the optical film.
  • the mold is substantially concave spherical, and when the in-plane position of the optical film is projected onto the mold from the normal direction of the surface of the optical film, the amount of infrared radiation irradiated to the optical film located at the apex (bottom (optical axis)) of the concave sphere is greater than the amount of infrared radiation irradiated to the optical film located at the end of the concave sphere.
  • the mold is substantially concave spherical, and when the in-plane position of the optical film is projected onto the mold from the normal direction of the surface of the optical film, the temperature of the optical film located at the apex of the concave sphere is higher than the temperature of the optical film located at the end of the concave sphere.
  • the ratio of the stretching ratio in the diameter direction to the stretching ratio in the circumferential direction at the peripheral portion tends to become distorted. That is, when pressing an optical film against the concave surface of a mold having a concave curved surface to mold the optical film onto the curved surface, the optical film is typically fixed to the peripheral portion (edge) of the curved surface of the mold, and reduced or increased pressure is applied to press the optical film against the curved surface of the mold to mold it.
  • the peripheral edge portion is fixed, so the peripheral edge portion of the optical film is stretched in the diameter direction but is hardly stretched in the circumferential direction.
  • the optical film has a higher degree of freedom in stretching as it approaches the bottom of the concave surface, so it is stretched in both the diameter direction and the circumferential direction. That is, in this molding method, the optical film is stretched in one axial direction at the peripheral edge portion, but is isotropically stretched at a position away from the peripheral edge portion.
  • the heating temperature of central portion 242C of optical film 242 having a circular planar shape placed on mold 240 (mold 240) having a concave molding surface is made higher by infrared irradiation than the heating temperature of peripheral portion 242R.
  • By changing the heating conditions for the central portion and peripheral portion it is possible to make the central portion more likely to stretch and the peripheral portion less likely to stretch.
  • the thickness is the thickest at the periphery and gradually decreases toward the bottom, and the bottom is the thinnest, as represented by the above-mentioned formula (1).
  • Formula (1) (t_max-t_min)/t_min > R-1 It is possible to produce an optical film that satisfies the above requirements.
  • An optical film satisfying such formula (1) is an optical film in which isotropically stretched over the entire curved surface of the optical film by lowering the stretch ratio of the peripheral portion that is uniaxially stretched and by increasing the stretch ratio of the bottom (center) region that is isotropically stretched, and thus has small in-plane variations in optical properties. Therefore, for example, when this optical film is used in a pancake lens type virtual reality display device, it is possible to reduce light leakage and display virtual reality images with few ghosts.
  • the method for producing the optical film of the present invention is not limited to the method using the molding die 240 having a concave surface as shown in FIG. That is, the optical film of the present invention can also be produced using a molding die 250 (mold 250) having a curved convex surface, as conceptually shown in Fig. 6.
  • a molding die 250 having a concave surface
  • an optical film 252 is fixed to the top of the convex surface of the molding die 250 and pressure is applied, thereby pressing the optical film against the curved convex surface of the mold to perform molding.
  • the stretching of the central portion 252C (the apex of the convex surface) that contacts the center of the molding die 250 is isotropic, and the stretching of the peripheral portion 252R is uniaxial along the diameter direction of the molding die 250.
  • the peripheral portion of the optical film 252 can also be stretched in the circumferential direction, thereby approaching isotropic stretching.
  • an optical film satisfying the formula (1) is an optical film in which the curved surface of the optical film is isotropically stretched over the entire surface by lowering the stretch ratio of the apex (apex) that is uniaxially stretched and increasing the stretch ratio of the peripheral region that is isotropically stretched, and thus has small in-plane variations in optical properties. Therefore, for example, when this optical film is used in a pancake lens type virtual reality display device, it is possible to reduce light leakage and display virtual reality images with fewer ghosts.
  • a movable stage with a horizontal top plate can be installed in the box 1 below the above-mentioned molding device, and the mold can be installed on the stage.
  • the movable stage can be raised to press the mold against the film to be molded.
  • the number of molds placed on the stage may be one or more. From the viewpoint of improving productivity, a film to be molded having an area larger than that of the mold may be used, and multiple molds may be placed to simultaneously produce multiple molded bodies.
  • ⁇ Tool for holding the mold> It is also preferable to hold the mold using a jig having a recess into which the mold can be fitted so that the mold does not move on the stage. In this way, the mold can be fixed so that it does not move on the stage.
  • the jig that holds the mold covers the surfaces of the mold other than the molding surface (the surface to which the molded film is attached). If the molded film is to cover the end surface of the mold in addition to the molding surface of the mold, the molded film will be significantly stretched, which may cause significant non-uniformity in the film thickness and optical properties.
  • the jig that covers the surfaces of the mold other than the molding surface to prevent the molded film from contacting the surfaces other than the molding surface.
  • the jig preferably has a horizontal surface and is at the same height as the molding surface of the mold in the portion where the mold is not present, which can prevent the formed film from being stretched in the portion other than the molding surface of the mold, and can improve the uniformity of the film thickness and optical properties.
  • the movable stage on which the jig and the mold are placed it is preferable to raise the movable stage on which the jig and the mold are placed so that the position of the forming surface of the mold is approximately equal to the position of the film to be formed, thereby preventing the film from coming into contact with the end face of the jig and being significantly stretched.
  • the above-mentioned jig may be integrated with the above-mentioned stage.
  • the method for attaching the optical film to the adherend such as a lens is not particularly limited.
  • the optical film may be formed into a curved shape by any of the above-mentioned methods, and then adhered to the adherend such as a lens using an adhesive or the like.
  • the adherend such as a lens becomes the mold (molding die).
  • the lens of the present invention is a composite lens that includes the optical film of the present invention.
  • the lens may have a lens substrate made of glass or transparent resin.
  • the lens substrate preferably does not change the polarization state of light and preferably has a phase difference (Re and Rth) of zero.
  • the lens may further include, in addition to the optical film of the present invention, a half mirror, an anti-reflection layer, an ultraviolet absorbing layer, a hard coat layer, and the like.
  • the shape of the lens is not particularly limited, but it is preferable that at least one surface is a curved surface. When the lens has a curved surface, the aberration of the displayed image can be corrected in the virtual reality display device, and a higher quality display can be achieved.
  • the curved surface may be a part of a spherical surface or may be an aspheric surface.
  • a convex lens, a concave lens, a meniscus lens, or the like can be used as the lens substrate.
  • a biconvex lens, a plano-convex lens, and a convex meniscus lens can be used as the convex lens.
  • a biconcave lens, a plano-concave lens, and a concave meniscus lens can be used.
  • the virtual reality display device of the present invention has a lens including the optical film of the present invention, and preferably has an image display device and a lens including the optical film of the present invention, which makes it possible for the virtual reality display device to suppress the occurrence of leakage light.
  • the image display device may have a display panel such as a liquid crystal display panel, an organic EL display panel, a micro LED display panel, etc.
  • the image display device may also include an absorptive polarizer, a retardation layer, an anti-reflection layer, an ultraviolet absorbing layer, a hard coat layer, etc.
  • the virtual reality display device may also include additional optical components such as an aberration correction lens and a diopter adjustment lens, etc.
  • the device may be equipped with various sensors that use near-infrared light as a light source for eye tracking, facial expression recognition, and iris authentication.
  • the virtual reality display device of the present invention includes an image display device.
  • the image display device can have an image display panel such as a liquid crystal display panel, an organic EL display panel, or a micro LED display panel.
  • the image display device preferably has an absorptive polarizer on the surface of the image display panel and includes a retardation layer on the outer side of the absorptive polarizer, i.e., the surface from which light is emitted, so that the image display device can emit ideal circularly polarized light.
  • the image display device may further include an anti-reflection layer, an ultraviolet absorbing layer, a hard coat layer, and the like, in addition to the above-mentioned retardation layer.
  • the virtual reality display device of the present invention can be used as a headset, such as glasses or goggles.
  • the virtual reality display device of the present invention can also be suitably used as an electronic viewfinder for a digital camera, an imager for an in-vehicle display, etc.
  • FIG. 7 An example of a virtual reality display device of the present invention is conceptually shown in Figure 7.
  • the virtual reality display device 20 shown in FIG. 7 includes an image display device and a pancake lens.
  • the image display device has, in this order, an image display panel 24, a ⁇ /4 wave plate 26, an absorptive linear polarizer 28, and a ⁇ /4 wave plate 30.
  • the pancake lens has, in this order, a half mirror 32, a lens substrate 34, a ⁇ /4 wave plate 36, a reflective linear polarizer 38, and an absorptive linear polarizer 40.
  • the pancake lens is the lens of the present invention.
  • the optical film of the present invention is the optical film of the present invention, preferably two of them, and more preferably all of them are the optical film of the present invention.
  • the optical film of the present invention may be the laminated optical body described above.
  • an image (virtual reality image) outputted by an image display panel 24 is converted into linearly polarized light by a ⁇ /4 wave plate 26, transmitted through an absorptive linear polarizer 28 to become linearly polarized light in a predetermined direction, converted into circularly polarized light by a ⁇ /4 wave plate 30, and outputted from the image display device.
  • the image display device outputs right-handed circularly polarized light R.
  • Half of the right-handed circularly polarized light R emitted from the image display device is transmitted through the half mirror 32 , transmitted through the lens substrate 34 , and converted by the ⁇ /4 wave plate 36 into linearly polarized light in the direction reflected by the reflective linear polarizer 38 .
  • This linearly polarized light is then reflected by the reflective linear polarizer 38, converted back into right-handed circularly polarized light R by the ⁇ /4 wave plate 36, transmitted through the lens substrate 34, and incident on the half mirror 32, half of which is reflected by the half mirror 32.
  • the right-handed circularly polarized light R is converted into left-handed circularly polarized light L.
  • the left-handed circularly polarized light L reflected by the half mirror 32 passes through the lens substrate 34 and is converted into linearly polarized light by the ⁇ /4 wavelength plate 36.
  • the ⁇ /4 wavelength plate 36 converts the right-handed circularly polarized light R into linearly polarized light in the direction reflected by the reflective linear polarizer 38, as described above.
  • the ⁇ /4 wavelength plate 36 converts the left-handed circularly polarized light L into linearly polarized light in the direction that transmits through the ⁇ /4 wavelength plate 36.
  • This linearly polarized light i.e., the virtual image, is thus transmitted through the reflective linear polarizer 38 and the absorbing linear polarizer 40 and is observed by a user E.
  • the pancake lens is a lens of the present invention that uses the optical film of the present invention, i.e., in this pancake lens, at least one, preferably all of ⁇ /4 wave plate 36, reflective linear polarizer 38, and absorptive linear polarizer 40 are the optical film of the present invention described above.
  • the optical film of the present invention has little in-plane variation in optical properties and appropriately exhibits predetermined optical properties.
  • the virtual reality display device 20 of the present invention can reduce leakage light that unnecessarily passes through the reflective linear polarizer 38, thereby reducing ghosts observed by the user E.
  • FIG. 8 An example of a virtual reality display device of the present invention is conceptually shown in Figure 8.
  • This example is a virtual reality display device that uses a reflective circular polarizer.
  • virtual reality display device 50 shown in Figure 8 uses many of the same components as virtual reality display device 20 shown in Figure 7, the same components are given the same symbols and the explanation will mainly focus on the different parts.
  • the virtual reality display device 50 shown in FIG. 8 includes an image display device and a pancake lens.
  • the image display device is the same as the above-mentioned virtual reality display device 20.
  • the pancake lens has a half mirror 32, a lens substrate 34, a reflective circular polarizer 52, a ⁇ /4 wave plate 36, and an absorptive linear polarizer 40, in this order.
  • the pancake lens is the lens of the present invention. Therefore, in the pancake lens, at least one of the reflective circular polarizer 52, the ⁇ /4 wave plate 36, and the absorbing linear polarizer 40 is the optical film of the present invention, preferably two of them, and more preferably all of them are the optical film of the present invention. In addition, when two or more adjacent functional layers have an optical film, the optical film of the present invention may be the laminated optical body described above.
  • the image display device emits right-handed circularly polarized light R, as an example.
  • Half of the right-handed circularly polarized light R emitted from the image display device is transmitted through the half mirror 32 , transmitted through the lens substrate 34 , and enters the reflective circular polarizer 52 .
  • the reflective circular polarizer 52 reflects right-handed circularly polarized light R. Therefore, the right-handed circularly polarized light R is reflected by the reflective circular polarizer 52, passes through the lens substrate 34, and enters the half mirror 32, and one half of the light is reflected by the half mirror 32.
  • the right-handed circularly polarized light R is converted into left-handed circularly polarized light L.
  • the left-handed circularly polarized light L reflected by the half mirror 32 passes through the lens substrate 34 and enters the reflective circular polarizer 52 again.
  • the reflective circular polarizer 52 reflects the right-handed circularly polarized light R, so that the left-handed circularly polarized light L passes through the reflective circular polarizer 52.
  • the left-handed circularly polarized light transmitted through the reflective circular polarizer 52 is converted by the ⁇ /4 wave plate 36 into linearly polarized light in a direction that passes through the absorbing linear polarizer 40, and is transmitted through the absorbing linear polarizer 40 to be observed by the user E.
  • the pancake lens is a lens of the present invention that uses the optical film of the present invention, i.e., in this pancake lens, at least one, preferably all of reflective circular polarizer 52, ⁇ /4 waveplate 36, and absorbing linear polarizer 40 are the optical film of the present invention.
  • the virtual reality display device 50 shown in Figure 8 can also reduce leakage light that unnecessarily passes through the reflective circular polarizer 52, thereby reducing the ghost observed by user E.
  • the film was further dried by conveying it between rolls of a heat treatment device to prepare an optical film having a thickness of 40 ⁇ m, which was designated as Cellulose Acylate Film A1.
  • the in-plane retardation of the obtained Cellulose Acylate Film 1 was 0 nm.
  • the coating solution E1 for forming a photo-alignment film having the following composition was continuously applied onto the above-mentioned cellulose acylate film A1 using a wire bar.
  • the support on which the coating film was formed was dried for 120 seconds with hot air at 140° C.
  • the coating film was then irradiated with polarized ultraviolet light (10 mJ/cm 2 , using an ultra-high pressure mercury lamp) to form a photo-alignment film E1 with a thickness of 0.2 ⁇ m, and a TAC film with a photo-alignment film was obtained.
  • Coating liquid E1 for forming photo-alignment film ⁇ 100.00 parts by weight of polymer PA-2 shown below 5.00 parts by weight of acid generator PAG-1 shown below 0.005 parts by weight of acid generator CPI-110TF shown below Isopropyl alcohol 16.50 parts by weight Butyl acetate 1072 .00 parts by mass Methyl ethyl ketone 268.00 parts by mass
  • the composition F1 having the following composition was applied onto the photo-alignment film E1 using a bar coater.
  • the coating film formed on the photo-alignment film E1 was heated to 120°C with hot air. After that, it was cooled to 60°C, and then irradiated with ultraviolet light of 100 mJ/ cm2 at a wavelength of 365 nm using a high-pressure mercury lamp under a nitrogen atmosphere. Then, the coating film was irradiated with ultraviolet light of 500 mJ/ cm2 while being heated to 120°C, thereby fixing the alignment of the liquid crystal compound, and a retardation film 1 having a positive A plate F1 was produced.
  • the positive A plate F1 had a thickness of 2.5 ⁇ m and an Re(550) of 141 nm.
  • the positive A plate satisfied the relationship Re(450) ⁇ Re(550) ⁇ Re(650) and had a reverse wavelength dispersion. Re(450)/Re(550) was 0.82.
  • composition F1 ⁇ 43.50 parts by mass of the following polymerizable liquid crystal compound LA-1; 43.50 parts by mass of the following polymerizable liquid crystal compound LA-2; 8.00 parts by mass of the following polymerizable liquid crystal compound LA-3; Polymerization initiator PI-1 (see below) 0.55 parts by mass Leveling agent T-1 (see below) 0.20 parts by mass Cyclopentanone 235.00 parts by mass ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
  • Polymerizable liquid crystal compound LA-1 (tBu represents a tertiary butyl group)
  • Polymerizable liquid crystal compound LA-4 (Me represents a methyl group)
  • An optically anisotropic layer coating solution (A) having the following composition was applied onto the photo-alignment film E1 using a bar coater, and heated for 60 seconds at 80° C. Thereafter, in a nitrogen atmosphere, the film on which the coating film was formed was irradiated with light from a metal halide lamp (manufactured by Eye Graphics Co., Ltd.) at an irradiation dose of 500 mJ at 80° C. to fix the alignment state of the liquid crystal compound, thereby producing a second optically anisotropic layer A2.
  • the product ⁇ nd of ⁇ n and d of the second optically anisotropic layer A2 at a wavelength of 550 nm was 194 nm, and the twist angle was 85°.
  • the molecular axis of the liquid crystal compound was parallel to the surface of the cellulose acylate film (or the surface of the optically anisotropic layer).
  • composition of optically anisotropic layer coating solution (A) 40 parts by weight of the following rod-shaped liquid crystal compound (A) 40 parts by weight of the following rod-shaped liquid crystal compound (B) 20 parts by weight of the following rod-shaped liquid crystal compound (C) 4 parts by weight of ethylene oxide-modified trimethylolpropane triacrylate (V#360, manufactured by Osaka Organic Chemical Co., Ltd.) Photopolymerization initiator (Irgacure 819, manufactured by Ciba Japan KK) 3 parts by mass of chiral agent (A) shown below; 0.46 parts by mass of polymerizable polymer (X) shown below; 0.5 parts by mass of polymer (A) shown below; 325 parts by mass of methyl isobutyl ketone
  • Rod-like liquid crystal compound (C) (hereinafter referred to as a mixture of liquid crystal compounds)
  • a coating liquid obtained by removing the chiral agent (A) from the above-mentioned optically anisotropic layer coating liquid (A) was applied onto the above-mentioned second optically anisotropic layer A2 using a bar coater, and heated for 60 seconds at 80° C. Thereafter, the film on which the coating film was formed was irradiated with light from a metal halide lamp (manufactured by Eye Graphics Co., Ltd.) at an irradiation dose of 500 mJ at 80° C. under a nitrogen atmosphere to fix the alignment state of the liquid crystalline compound, thereby producing a first optically anisotropic layer A1.
  • a metal halide lamp manufactured by Eye Graphics Co., Ltd.
  • the first optically anisotropic layer A1 was a positive A plate having a product ⁇ nd of 205 nm at a wavelength of 550 nm, and the slow axis direction was the same as that of the uppermost layer of the second optically anisotropic layer A2.
  • a retardation film 2 was prepared.
  • the effective in-plane retardation of the retardation film 2 was in the range of ⁇ /4 ⁇ 5% at least in the wavelength ⁇ range of 450 nm to 650 nm.
  • Retardation film 3 was prepared in the same manner as in the retardation film 2, except that the thickness of the optically anisotropic layer and the amount of the chiral agent (A) contained in the optically anisotropic layer were adjusted.
  • the second optically anisotropic layer in the retardation film 3 had a product ⁇ nd of 157 nm and a twist angle of 81° at a wavelength of 550 nm.
  • the first optically anisotropic layer had a product ⁇ nd of 310 nm and a twist angle of 24° at a wavelength of 550 nm.
  • the effective in-plane retardation of the retardation film 3 was in the range of ⁇ /4 ⁇ 5% at least in the wavelength ⁇ range of 450 nm to 650 nm.
  • the above-mentioned cellulose acylate film A1 was used as the temporary support.
  • the cellulose acylate film A1 was passed through a dielectric heating roll at a temperature of 60° C., and the surface temperature of the film was raised to 40° C.
  • an alkaline solution having the composition shown below was applied to one side of the film in an amount of 14 ml/ m2 using a bar coater, heated to 110° C., and conveyed under a steam type far-infrared heater manufactured by Noritake Co., Limited for 10 seconds.
  • 3 ml/ m2 of pure water was applied onto the film using the same bar coater.
  • the film was transported to a drying zone at 70° C. for 10 seconds and dried to prepare an alkaline saponified cellulose acylate film A1.
  • the coating solution G1 for forming an alignment film having the following composition was continuously applied onto the above-mentioned alkaline saponification-treated cellulose acylate film A1 using a #8 wire bar.
  • the resulting film was dried with hot air at 60°C for 60 seconds and then with hot air at 100°C for 120 seconds to form an alignment film G1.
  • a coating solution H1 for forming a positive C plate having the following composition was applied onto the alignment film G1, and the resulting coating film was aged at 60° C. for 60 seconds.
  • the coating film was then irradiated with ultraviolet light at 1,000 mJ/cm 2 using an air-cooled metal halide lamp (manufactured by Eye Graphics Co., Ltd.) at 70 mW/ cm 2 in air to fix the alignment state, thereby vertically aligning the liquid crystal compound and producing a positive C plate with a thickness of 0.8 ⁇ m.
  • the Rth(550) of the obtained positive C plate was ⁇ 80 nm.
  • Positive C-plate forming coating solution H1 80 parts by mass of the following liquid crystal compound LC-1; 20 parts by mass of the following liquid crystal compound LC-2; 1 part by mass of the following vertical alignment agent S01; and 1 part by mass of ethylene oxide-modified trimethylolpropane triacrylate (V#360, Osaka Organic Chemical Co., Ltd.).
  • the following coating solution S-P-1 for forming an optically absorbing anisotropic layer was continuously coated with a wire bar.
  • the coating layer P1 was heated at 140°C for 30 seconds, and the coating layer P1 was cooled to room temperature (23°C).
  • the film thickness was 1.6 ⁇ m. In this manner, an absorptive linear polarizer P1 was prepared.
  • a retardation film 4 was prepared in the same manner as in the retardation film 2, except that the optically anisotropic layer coating solution (A) was changed to the following optically anisotropic layer coating solution (B).
  • composition of optically anisotropic layer coating solution (B) --------------------------------------------------------------------------------------------------- 70 parts by weight of the following liquid crystal compound L-1 30 parts by weight of the following liquid crystal compound L-2 0.6 parts by weight of the following polymerization initiator S-1 4 parts by weight of ethylene oxide modified trimethylolpropane triacrylate (V#360, manufactured by Osaka Organic Chemical Co., Ltd.) Photopolymerization initiator (Irgacure 819, manufactured by Ciba Japan Co., Ltd.) 3 parts by mass of the chiral agent (A) above, 0.46 parts by mass of the polymerizable polymer (X) above, 0.5 parts by mass of the polymer (A) above, 200 parts by mass of methyl ethyl ketone, and 200 parts by mass of cyclopentanone.
  • V#360 ethylene oxide modified trimethylolpropane triacrylate
  • the first optically anisotropic layer was a positive A plate having a product ⁇ nd of 203 nm at a wavelength of 550 nm, and the slow axis direction was the same as that of the uppermost layer of the second optically anisotropic layer.
  • the product ⁇ nd of ⁇ n and d of the second optically anisotropic layer at a wavelength of 550 nm was 196 nm, and the twist angle was 85°.
  • the effective in-plane retardation of the retardation film 4 was in the range of ⁇ /4 ⁇ 5% at least in the wavelength ⁇ range of 450 nm to 650 nm.
  • the numerical values are mass %.
  • R is a group bonded via an oxygen atom.
  • the average molar absorption coefficient of the above rod-shaped liquid crystal compound in the wavelength range 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.
  • ⁇ Reflective layer coating solution R-2> The coating solution was prepared in the same manner as in the coating solution R-1 for the reflective layer, except that the amount of chiral agent A added was changed as shown in Table 1 below.
  • ⁇ Reflective Layer Coating Solution D-1> The composition shown below was stirred and dissolved in a container kept at 50° C. to prepare a coating solution D-1 for a reflective layer, where D represents a coating solution using a discotic liquid crystal compound.
  • ⁇ Preparation of Reflective Circular Polarizer 1>> As a temporary support, a PET film (A4265, manufactured by Toyobo Co., Ltd.) having a thickness of 100 ⁇ m was prepared, and the PET surface on the side on which the adhesive layer was not formed was subjected to a rubbing treatment. The above-prepared reflective layer coating solution R-1 was applied with a wire bar coater, and then dried at 110°C for 72 seconds.
  • the coating was cured by irradiating light from a metal halide lamp at 100°C with an illuminance of 80 mW/ cm2 and an exposure dose of 500 mJ/ cm2 in a low-oxygen atmosphere (100 ppm or less) to form a first blue light reflective layer (first cholesteric liquid crystal layer) made of a cholesteric liquid crystal layer.
  • the light irradiation was performed from the cholesteric liquid crystal layer side.
  • the coating thickness was adjusted so that the film thickness of the first blue light reflective layer after curing was 2.6 ⁇ m.
  • the surface of the first blue light reflecting layer was subjected to a corona treatment at a discharge amount of 150 W ⁇ min/m 2, and then the coating liquid for reflecting layer D-1 was applied onto the corona-treated surface with a wire bar coater.
  • the coating film was then dried at 70°C for 2 minutes, and the solvent was evaporated, followed by heating and aging at 115°C for 3 minutes to obtain a uniform alignment state.
  • the coating film was then held at 45°C, and irradiated with ultraviolet light (300 mJ/ cm2 ) using a metal halide lamp under a nitrogen atmosphere to harden the film, forming a second blue light reflective layer (second cholesteric liquid crystal layer) on the first blue light reflective layer.
  • the light was irradiated from the cholesteric liquid crystal layer side. At this time, the coating thickness was adjusted so that the film thickness of the second blue light reflective layer after hardening was 2.0 ⁇ m.
  • the second blue light reflective layer was coated with the reflective layer coating solution D-2 using a wire bar coater.
  • the coating film was then dried at 70° C. for 2 minutes, and the solvent was evaporated, followed by heating and aging at 115° C. for 3 minutes to obtain a uniform alignment state.
  • the coating film was then held at 45°C and irradiated with ultraviolet light (300 mJ/ cm2 ) using a metal halide lamp in a nitrogen atmosphere to harden it, forming a green light reflective layer (third cholesteric liquid crystal layer) on the second blue light reflective layer. Light was irradiated from the cholesteric liquid crystal layer side.
  • the coating thickness was adjusted so that the hardened green light reflective layer had a thickness of 2.7 ⁇ m.
  • the reflective layer coating solution R-2 was applied onto the green light reflective layer using a wire bar coater, and then dried at 110° C. for 72 seconds. Thereafter, the mixture was cured under a low-oxygen atmosphere (100 ppm or less) by irradiating light from a metal halide lamp at 100° C. with an illuminance of 80 mW and an exposure dose of 500 mJ/cm 2 to form a red light reflective layer (fourth cholesteric liquid crystal layer) on the green light reflective layer. The light was irradiated from the cholesteric liquid crystal layer side. At this time, the coating thickness was adjusted so that the red light reflective layer after curing had a film thickness of 3.4 ⁇ m.
  • the red light reflective layer surface was subjected to a corona treatment at a discharge amount of 150 W min/ m2, and then the reflective layer coating solution D-3 was applied onto the corona-treated surface with a wire bar coater.
  • the coating film was then dried at 70°C for 2 minutes, and the solvent was evaporated, followed by heat aging at 115°C for 3 minutes to obtain a uniform alignment state.
  • the coating film was then held at 45°C and irradiated with ultraviolet light (300 mJ/ cm2 ) using a metal halide lamp in a nitrogen atmosphere to harden the film, forming a yellow light reflective layer (fifth cholesteric liquid crystal layer) on the red light reflective layer. Light was irradiated from the cholesteric liquid crystal layer side.
  • the coating thickness was adjusted so that the hardened yellow light reflective layer had a thickness of 3.4 ⁇ m.
  • a reflective circular polarizer 1 which has a first cholesteric liquid crystal layer through a fifth cholesteric liquid crystal layer in that order.
  • Table 3 shows the central reflection wavelength and film thickness for each cholesteric liquid crystal layer of the reflective circular polarizer 1 produced.
  • the central reflection wavelength shown in Table 3 corresponds to the central wavelength of the reflected light of the cholesteric liquid crystal layer described above.
  • the central reflection wavelength (central wavelength of the reflected light) was confirmed by creating a film in which each cholesteric liquid crystal layer was coated in a single layer. The film thickness was confirmed using an SEM.
  • the temporary support of the obtained reflective circular polarizer 1 was peeled off, and the surface of the first cholesteric liquid crystal layer was subjected to SHG measurement, which revealed that the degree of orientation of the liquid crystal compound was 0.65. Furthermore, within the effective area when the liquid crystal compound was incorporated into a virtual image display device, the variation in the director orientation of the liquid crystal compound was 3.2°. In addition, when SHG measurement was performed on the surface of the reflective circular polarizer 1 on the side of the fifth cholesteric liquid crystal layer, the degree of orientation of the liquid crystal compound was 0.62. In addition, within the effective area when incorporated into a virtual image display device, the variation in the director orientation of the liquid crystal compound was 85°.
  • a second retardation film 1 was attached to the first retardation film 1 so that the slow axis direction was aligned with that of the first retardation film 1, and the temporary support was peeled off.
  • the third retardation film 1 was attached to the second retardation film 1 so that the slow axis orientations were 60° to each other, and the temporary support was peeled off.
  • the reflection axis orientation of the APF and the slow axis orientation of the retardation film 1 on the third surface were 15° to each other.
  • the above-mentioned positive C plate was attached to the third retardation film 1, and the temporary support was peeled off.
  • an absorptive linear polarizer P1 was attached to the opposite surface of the APF, and the temporary support was peeled off. At this time, the reflection axis direction of the APF was adjusted to coincide with the absorption axis direction of the absorptive linear polarizer P1. In this manner, the laminated optical body 1 was obtained.
  • the first retardation film 1 and the second retardation film 1 of the three laminated retardation films 1 have the same slow axis orientation, so they can be collectively regarded as the first optically anisotropic layer.
  • the third retardation film 1 can be regarded as the second optically anisotropic layer.
  • the first optically anisotropic layer has an in-plane retardation of 282 nm
  • the second optically anisotropic layer has an in-plane retardation of 141 nm.
  • both the first optically anisotropic layer and the second optically anisotropic layer have reverse wavelength dispersion.
  • an absorptive linear polarizer P1 was attached to the opposite surface of the APF, and the temporary support was peeled off. At this time, the reflection axis direction of the APF was adjusted to coincide with the absorption axis direction of the absorptive linear polarizer P1. In this manner, a laminated optical body 2 was obtained.
  • a laminated optical body 3 was produced in the same manner as the laminated optical body 2, except that the retardation film 1 was changed to the retardation film 2.
  • a laminated optical body 4 was produced in the same manner as the laminated optical body 2, except that the retardation film 1 was changed to the retardation film 3.
  • a laminated optical body 5 was produced in the same manner as the laminated optical body 2, except that the retardation film 1 was changed to the retardation film 4.
  • the laminated optical body 1 was set in a molding device.
  • the molding space in the molding apparatus consisted of box 1 and box 2 separated by laminated optical body 1, and a convex meniscus lens LE1076-A (diameter 2 inches, focal length 100 mm, radius of curvature on the concave side 65 mm) manufactured by Thorlab Corp. with aluminum vapor deposition on the convex side was placed as a mold in box 1 below laminated optical body 1, with the concave surface facing up.
  • a transparent window was provided at the top of the box 2 above the laminated optical body 1, and an IR light source for heating the laminated optical body 1 was provided outside the window.
  • a circular patterned infrared reflection filter obtained by cutting out a cholesteric liquid crystal layer, which reflects infrared rays with wavelengths of 2.2 ⁇ m to 3.0 ⁇ m at a reflectance of approximately 50%, into a circle with a diameter of 1 inch was placed between the IR light source and the laminated optical body 1.
  • the patterned infrared reflection filter was placed so that the center of the filter was at the center of the mold when viewed from directly above.
  • the inside of box 1 and the inside of box 2 were evacuated to a vacuum of 0.1 atmosphere or less using a vacuum pump.
  • the optical film 1 had a curved surface with a radius of curvature of 65 mm. Furthermore, the surface area of the curved surface was measured using a Fizeau interferometer (manufactured by Fujifilm Corporation) and found to be 2111 mm2 . On the other hand, the projected area of the curved surface, i.e., the projected area of the curved surface projected onto a plane perpendicular to the optical axis, was 2027 mm2 . Therefore, the ratio R1 of the surface area of the curved surface to the projected area of the curved surface was 1.041. Therefore, R1-1 was 0.041. The thickness of the optical film on the curved surface was measured at a total of 33 points using the method described above with reference to Fig. 5.
  • the ratio t11/t21 of the thickness t11 of the first optically anisotropic layer to the thickness t21 of the second optically anisotropic layer had a maximum in-plane variation of 3%.
  • the variation in the effective in-plane retardation of the optical film 1 was 4%.
  • the variation in the slow axis direction of the first optically anisotropic layer projected onto a plane perpendicular to the curved surface was a maximum of 1.1° in the plane.
  • the variation in the slow axis direction of the second optically anisotropic layer projected onto a plane perpendicular to the curved surface was a maximum of 1.2° in the plane.
  • the variation in the effective slow axis direction of the optical film 1 projected onto a plane perpendicular to the curved surface was 1.3°.
  • the positions where the in-plane variation was measured were positions corresponding to the intersections of the pattern as shown in Fig. 5, and a total of 17 points were measured, including the center point, circles spaced at equal intervals of 10 mm radius in the diameter direction, and intersections of lines spaced at equal intervals of 45 degrees in the azimuth angle direction.
  • the in-plane variation was calculated from the average, maximum, and minimum values of these 17 points. The same applies to the following examples.
  • the laminated optical body 1 was changed to the laminated optical body 2, and molding was carried out in the same manner as for the optical film 1. In this manner, the optical film 2 was obtained.
  • the optical film 2 had a curved surface with a radius of curvature of 65 mm.
  • the surface area of the curved surface of Optical Film 2 was 2111 mm2 .
  • the projected area of the curved surface was 2027 mm2 . Therefore, the ratio R2 of the surface area of the curved surface to the projected area of the curved surface was 1.041. Therefore, R2-1 was 0.041.
  • the laminated optical body 1 was changed to the laminated optical body 3, and molding was carried out in the same manner as for the optical film 1. In this manner, the optical film 3 was obtained.
  • the optical film 3 had a curved surface with a radius of curvature of 65 mm.
  • the surface area of the curved surface of Optical Film 3 was 2111 mm2 .
  • the projected area of the curved surface was 2027 mm2 . Therefore, the ratio R3 of the surface area of the curved surface to the projected area of the curved surface was 1.041. Therefore, R3-1 was 0.041.
  • the ratio t13/t23 of the thickness t13 of the first optically anisotropic layer to the thickness t23 of the second optically anisotropic layer had a maximum in-plane variation of 2%.
  • the variation in the effective in-plane retardation of the optical film 3 was 3%.
  • the variation in the effective slow axis direction of the optical film 3 projected onto a plane perpendicular to the curved surface was 1.2°.
  • the laminated optical body 1 was changed to the laminated optical body 4, and molding was carried out in the same manner as for the optical film 1. In this manner, the optical film 4 was obtained.
  • the optical film 4 had a curved surface with a radius of curvature of 65 mm.
  • the surface area of the curved surface of Optical Film 4 was 2111 mm2 .
  • the projected area of the curved surface was 2027 mm2 . Therefore, the ratio R4 of the surface area of the curved surface to the projected area of the curved surface was 1.041. Therefore, R4-1 was 0.041.
  • the ratio t14/t24 of the thickness t14 of the first optically anisotropic layer to the thickness t24 of the second optically anisotropic layer had a maximum in-plane variation of 2.6%.
  • the variation in the effective in-plane retardation of the optical film 4 was 4%.
  • the variation in the effective slow axis direction of the optical film 4 projected onto a plane perpendicular to the curved surface was 1.6°.
  • the laminated optical body 1 was set in a molding device.
  • the molding space in the molding apparatus consisted of box 1 and box 2 separated by laminated optical body 1, and a convex meniscus lens LE1076-A (diameter 2 inches, focal length 100 mm, radius of curvature on the concave side 65 mm) manufactured by Thorlab Corp. with aluminum vapor deposition on the convex side was placed as a mold in box 1 below laminated optical body 1, with the concave surface facing up.
  • a transparent window was provided at the top of the box 2 above the laminated optical body 1, and an IR light source for heating the laminated optical body 1 was provided outside the window.
  • the inside of box 1 and the inside of box 2 were evacuated to a vacuum of 0.1 atmosphere or less using a vacuum pump.
  • a step of heating the laminated optical body 1 infrared rays were irradiated and the laminated optical body 1 was heated uniformly to 108° C. Since the glass transition temperature Tg of the PMMA film used as the support was 105° C., the aim was to make the entire body easily stretchable during molding.
  • gas was flowed into the box 2 from a gas cylinder to pressurize it to 300 kPa, and the laminated optical body 1 was pressure-bonded to the mold.
  • the laminated optical body 1 was removed from the lens, which was the mold. In this way, an optical film 5 was obtained.
  • the optical film 5 had a curved surface with a radius of curvature of 65 mm.
  • the surface area of the curved surface of Optical Film 5 was 2111 mm2 .
  • the projected area of the curved surface was 2027 mm2 . Therefore, the ratio R5 of the surface area of the curved surface to the projected area of the curved surface was 1.041. Therefore, R5-1 was 0.041.
  • the ratio t15/t25 of the thickness t15 of the first optically anisotropic layer to the thickness t25 of the second optically anisotropic layer had a maximum in-plane variation of 12%.
  • the variation in the effective in-plane retardation of the optical film 5 was 15%.
  • the variation in the slow axis direction of the first optically anisotropic layer projected onto a plane perpendicular to the curved surface was a maximum of 2.9° in the plane.
  • the variation in the slow axis direction of the second optically anisotropic layer projected onto a plane perpendicular to the curved surface was a maximum of 3.3° in the plane.
  • the variation in the effective slow axis direction of the optical film 5 projected onto a plane perpendicular to the curved surface was 3.1°.
  • the laminated optical body 1 was changed to the laminated optical body 5, and molding was carried out in the same manner as for the optical film 1. In this manner, the optical film 6 was obtained.
  • the optical film 6 had a curved surface with a radius of curvature of 65 mm.
  • the surface area of the curved surface of Optical Film 6 was 2111 mm2 .
  • the projected area of the curved surface was 2027 mm2 . Therefore, the ratio R6 of the surface area of the curved surface to the projected area of the curved surface was 1.041. Therefore, R6-1 was 0.041.
  • the laminated optical body 1 was changed to the laminated optical body 6, and molding was carried out in the same manner as for the optical film 1. In this manner, the optical film 7 was obtained.
  • the optical film 7 had a curved surface with a radius of curvature of 65 mm.
  • the surface area of the curved surface of Optical Film 7 was 2111 mm2 .
  • the projected area of the curved surface was 2027 mm2 . Therefore, the ratio R7 of the surface area of the curved surface to the projected area of the curved surface was 1.041. Therefore, R7-1 was 0.041.
  • the laminated optical body 1 was changed to a laminated optical body 6, and molding was carried out in the same manner as for the optical film 5. In this manner, an optical film 8 was obtained.
  • the optical film 8 had a curved surface with a radius of curvature of 65 mm.
  • the surface area of the curved surface of Optical Film 7 was 2111 mm2 .
  • the projected area of the curved surface was 2027 mm2 . Therefore, the ratio R8 of the surface area of the curved surface to the projected area of the curved surface was 1.041. Therefore, R8-1 was 0.041.
  • Virtual reality display devices of Examples 2 to 6 were produced in the same manner as in Example 1, except that Lens 1 was replaced with Lenses 2 to 4, Lens 6 and Lens 7 described above.
  • REFERENCE SIGNS LIST 10 12 Optical film 20, 50 Virtual reality display device 24 Image display panel 26, 30, 36 ⁇ /4 wavelength plate 28, 40 Absorptive linear polarizer 32 Half mirror 34 Lens substrate 36 ⁇ /4 wavelength plate 38 Reflective linear polarizer 52 Reflective circular polarizer 240, 250 Mold 242, 252 Optical film 242C, 252C Central portion of optical film 242R, 252R Peripheral portion of optical film

Landscapes

  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • General Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Polarising Elements (AREA)
PCT/JP2024/022546 2023-06-28 2024-06-21 光学フィルム、レンズ、および仮想現実表示装置 Ceased WO2025004991A1 (ja)

Priority Applications (3)

Application Number Priority Date Filing Date Title
CN202480043317.5A CN121420220A (zh) 2023-06-28 2024-06-21 光学膜、透镜及虚拟现实显示装置
JP2025530086A JPWO2025004991A1 (https=) 2023-06-28 2024-06-21
US19/415,888 US20260098991A1 (en) 2023-06-28 2025-12-11 Optical film, lens, and virtual reality display apparatus

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
JP2023-106332 2023-06-28
JP2023106332 2023-06-28
JP2023-113276 2023-07-10
JP2023113276 2023-07-10
JP2024-024294 2024-02-21
JP2024024294 2024-02-21

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US19/415,888 Continuation US20260098991A1 (en) 2023-06-28 2025-12-11 Optical film, lens, and virtual reality display apparatus

Publications (1)

Publication Number Publication Date
WO2025004991A1 true WO2025004991A1 (ja) 2025-01-02

Family

ID=93938586

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2024/022546 Ceased WO2025004991A1 (ja) 2023-06-28 2024-06-21 光学フィルム、レンズ、および仮想現実表示装置

Country Status (4)

Country Link
US (1) US20260098991A1 (https=)
JP (1) JPWO2025004991A1 (https=)
CN (1) CN121420220A (https=)
WO (1) WO2025004991A1 (https=)

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014209219A (ja) * 2013-03-25 2014-11-06 富士フイルム株式会社 円偏光板用位相差板、円偏光板、有機ｅｌ表示装置
JP2014209220A (ja) * 2013-03-25 2014-11-06 富士フイルム株式会社 円偏光板用位相差板、円偏光板、有機ｅｌ表示装置
JP2016130782A (ja) * 2015-01-14 2016-07-21 日東電工株式会社 偏光膜の製造方法
WO2019059067A1 (ja) * 2017-09-22 2019-03-28 日本ゼオン株式会社 真正性判定用ビュワー
WO2021261435A1 (ja) * 2020-06-22 2021-12-30 富士フイルム株式会社 円偏光板、有機エレクトロルミネッセンス表示装置
JP2022020360A (ja) * 2020-07-20 2022-02-01 Ａｇｃ株式会社 光学素子、及びその製造方法
WO2022075475A1 (ja) * 2020-10-09 2022-04-14 富士フイルム株式会社 積層光学フィルムおよび画像表示装置
JP2022105743A (ja) * 2014-06-27 2022-07-14 日東電工株式会社 偏光板の製造方法
WO2022260134A1 (ja) * 2021-06-10 2022-12-15 富士フイルム株式会社 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

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014209219A (ja) * 2013-03-25 2014-11-06 富士フイルム株式会社 円偏光板用位相差板、円偏光板、有機ｅｌ表示装置
JP2014209220A (ja) * 2013-03-25 2014-11-06 富士フイルム株式会社 円偏光板用位相差板、円偏光板、有機ｅｌ表示装置
JP2022105743A (ja) * 2014-06-27 2022-07-14 日東電工株式会社 偏光板の製造方法
JP2016130782A (ja) * 2015-01-14 2016-07-21 日東電工株式会社 偏光膜の製造方法
WO2019059067A1 (ja) * 2017-09-22 2019-03-28 日本ゼオン株式会社 真正性判定用ビュワー
WO2021261435A1 (ja) * 2020-06-22 2021-12-30 富士フイルム株式会社 円偏光板、有機エレクトロルミネッセンス表示装置
JP2022020360A (ja) * 2020-07-20 2022-02-01 Ａｇｃ株式会社 光学素子、及びその製造方法
WO2022075475A1 (ja) * 2020-10-09 2022-04-14 富士フイルム株式会社 積層光学フィルムおよび画像表示装置
WO2022260134A1 (ja) * 2021-06-10 2022-12-15 富士フイルム株式会社 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

Also Published As

Publication number Publication date
US20260098991A1 (en) 2026-04-09
JPWO2025004991A1 (https=) 2025-01-02
CN121420220A (zh) 2026-01-27

Similar Documents

Publication Publication Date Title
US12345907B2 (en) Optical laminate, laminated optical film, optical article, and virtual reality display device
US20250035986A1 (en) Optically functional film, optical laminate, formed product, manufacturing method of optical component, optical component, virtual reality display apparatus, optical film, and forming method
WO2022270502A1 (ja) 光学積層体、光学積層体の製造方法、光学積層体の裁断方法
TW202347358A (zh) 成形方法、光學膜、膽固醇型液晶層、光學積層體及曲面狀光學功能性層的製作方法
US20250085466A1 (en) Optical laminate, laminated optical film, optical article, and virtual reality display device
JP7693300B2 (ja) 位相差層付偏光板およびそれを用いた有機エレクトロルミネセンス表示装置
WO2025013565A1 (ja) レンズ、画像表示装置、および仮想現実表示装置
WO2025004991A1 (ja) 光学フィルム、レンズ、および仮想現実表示装置
WO2025004986A1 (ja) 光学フィルムの成形方法
US20260126575A1 (en) Lens, image display device, and virtual reality display apparatus
JP2024008080A (ja) 偏光フィルター、偏光カメラレンズフィルター、偏光ビームスプリッタ及び偏光レンズ
US20250321370A1 (en) Retardation film, laminated optical film, optical article, and virtual reality display device
US20260003113A1 (en) Optical laminate, optical lens, and virtual reality display apparatus
US20260003112A1 (en) Light absorption anisotropic film, laminate, composite lens, and virtual reality display apparatus
US20250362488A1 (en) Light absorption anisotropic film, laminate, composite lens, and virtual reality display apparatus
US20260009929A1 (en) Light absorption anisotropic film, laminate, composite lens, and virtual reality display apparatus
US20260016615A1 (en) Optical film, optically anisotropic film, laminate, and display device
US20250298238A1 (en) Optical laminate, laminated optical film, optical article, and virtual reality display device
WO2025063263A1 (ja) 赤外光反射素子、積層光学フィルムおよび光学物品
WO2026023452A1 (ja) 光吸収異方性膜、積層体、複合レンズ、ゴーグル型表示装置および光吸収異方性膜の製造方法
WO2025063244A1 (ja) 赤外光反射素子、積層光学フィルムおよび光学物品
WO2026048385A1 (ja) 積層体、複合レンズ、ゴーグル型表示装置および積層体の製造方法
WO2025069986A1 (ja) 積層体、仮想現実表示装置、積層体の製造方法
WO2025239242A1 (ja) 積層体、成形体の製造方法
WO2025142815A1 (ja) 積層体、複合レンズ、表示装置、仮想現実表示装置

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 24831852

Country of ref document: EP

Kind code of ref document: A1

ENP Entry into the national phase

Ref document number: 2025530086

Country of ref document: JP

Kind code of ref document: A

WWE Wipo information: entry into national phase

Ref document number: 2025530086

Country of ref document: JP

NENP Non-entry into the national phase

Ref country code: DE