WO2018110066A1 - Vitre de pare-brise, système d'affichage tête haute et film stratifié - Google Patents

Vitre de pare-brise, système d'affichage tête haute et film stratifié Download PDF

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Publication number
WO2018110066A1
WO2018110066A1 PCT/JP2017/037322 JP2017037322W WO2018110066A1 WO 2018110066 A1 WO2018110066 A1 WO 2018110066A1 JP 2017037322 W JP2017037322 W JP 2017037322W WO 2018110066 A1 WO2018110066 A1 WO 2018110066A1
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liquid crystal
layer
cholesteric liquid
windshield glass
light
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PCT/JP2017/037322
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English (en)
Japanese (ja)
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昭裕 安西
渉 馬島
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富士フイルム株式会社
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Publication of WO2018110066A1 publication Critical patent/WO2018110066A1/fr

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    • 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
    • G02B27/01—Head-up displays
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements

Definitions

  • the present invention relates to a windshield glass.
  • the present invention also relates to a head-up display system using a windshield glass and a laminated film that can be used for the windshield glass.
  • a half mirror film is provided on the intermediate layer of windshield glass, which has a structure in which two glass plates are bonded via an intermediate layer, thereby simultaneously displaying images projected in the head-up display system and the scenery in front. It is possible to obtain a projection image display member that can be made to operate.
  • Patent Document 1 discloses that an intermediate layer is formed by sandwiching a half mirror film including a cholesteric liquid crystal layer between two resin films such as a polyvinyl butyral film.
  • the present invention has been made to solve the above problems, and in a windshield glass having a structure in which a half mirror film is provided in an intermediate layer of a laminated glass, distortion that is visually confirmed in the half mirror film portion is reduced.
  • An object is to provide a windshield glass.
  • the inventor has intensively studied under the above problems, and the orange peel is less likely to occur when the half mirror film is integrated with a highly rigid base material at the time of pressure bonding or heating at the time of laminated glass production.
  • the present invention was completed.
  • a windshield glass including a first glass plate, a first resin film, a half mirror film, a second resin film, and a second glass plate in this order, Further including a substrate,
  • the half mirror film includes a circularly polarized light reflection layer,
  • the circularly polarized light reflection layer includes a cholesteric liquid crystal layer,
  • the half mirror film is adjacent to the base material,
  • the circularly polarized light reflecting layer includes three or more cholesteric liquid crystal layers having a central wavelength of selective reflection in a visible light region,
  • the windshield glass according to any one of [1] to [10], wherein the central wavelengths of selective reflection of each of the three or more cholesteric liquid crystal layers are different from each other.
  • the circularly polarized light reflection layer includes four or more cholesteric liquid crystal layers, One of the four or more cholesteric liquid crystal layers is a cholesteric liquid crystal layer having a central wavelength of selective reflection at 350 nm or more and less than 490 nm,
  • the cholesteric liquid crystal layer closest to the ⁇ / 2 retardation layer among the four or more cholesteric liquid crystal layers is a cholesteric liquid crystal layer having a selective reflection center wavelength of 350 nm or more and less than 490 nm. Windshield glass.
  • any one or more selected from the group consisting of the first resin film and the second resin film includes polyvinyl butyral.
  • a head-up display system including the windshield glass and the projector according to any one of [6] to [9], A head-up display system in which the circularly polarized light reflecting layer, the retardation layer, and the projector are arranged in this order.
  • a laminated film comprising a substrate and a half mirror film, The half mirror film is bonded to the substrate with an adhesive layer on a part of the main surface of the substrate, The half mirror film includes a circularly polarized light reflection layer, The circularly polarized light reflection layer includes three or more cholesteric liquid crystal layers having a central wavelength of selective reflection in the visible light region, A laminated film in which the substrate is a polyethylene terephthalate film, the elastic modulus of the substrate is 3 GPa to 10 GPa, and the thickness of the substrate is 150 ⁇ m to 500 ⁇ m.
  • the windshield glass having a laminated glass structure including a half mirror film in the intermediate layer it is possible to provide a windshield glass that is visually confirmed and is not distorted due to the half mirror film.
  • This windshield glass can be used in a head-up display system.
  • the laminated film suitable for preparation of said windshield glass is provided.
  • an angle for example, an angle such as “90 °”
  • a relationship thereof for example, “parallel”, “horizontal”, “vertical”, etc.
  • “selective” for circularly polarized light means that the amount of light of either the right circularly polarized component or the left circularly polarized component of light is greater than that of the other circularly polarized component.
  • the degree of circular polarization of light is preferably 0.3 or more, more preferably 0.6 or more, and even more preferably 0.8 or more. More preferably, it is substantially 1.0. Table In / (I R + I L)
  • sense for circularly polarized light means right circularly polarized light or left circularly polarized light.
  • the sense of circularly polarized light is right-handed circularly polarized light when the electric field vector tip turns clockwise as time increases when viewed as the light travels toward you, and left when it turns counterclockwise. Defined as being circularly polarized.
  • the term “sense” is sometimes used for the twist direction of the spiral of the cholesteric liquid crystal.
  • the twist direction (sense) of the spiral of the cholesteric liquid crystal is right, it reflects right circularly polarized light and transmits left circularly polarized light.
  • the sense When the sense is left, it reflects left circularly polarized light and transmits right circularly polarized light.
  • light means visible light and natural light (unpolarized light) unless otherwise specified.
  • Visible light is light having a wavelength that can be seen by the human eye among electromagnetic waves, and usually indicates light having a wavelength range of 380 nm to 780 nm.
  • the measurement of the light intensity required in connection with the calculation of the light transmittance may be performed by using, for example, a normal visible spectrum meter and measuring the reference as air.
  • the term “reflected light” or “transmitted light” is used to mean scattered light and diffracted light.
  • the polarization state of each wavelength of light can be measured using a spectral radiance meter or a spectrometer equipped with a circularly polarizing plate.
  • the intensity of light measured through the right circularly polarizing plate corresponds to I R
  • the intensity of light measured through the left circularly polarizing plate corresponds to I L.
  • the measurement can be performed.
  • the ratio can be measured by attaching a right circular polarized light transmission plate, measuring the right circular polarized light amount, attaching a left circular polarized light transmission plate, and measuring the left circular polarized light amount.
  • p-polarized light means polarized light that vibrates in a direction parallel to the light incident surface.
  • the incident surface means a surface that is perpendicular to a reflecting surface (such as a windshield glass surface) and includes incident light rays and reflected light rays.
  • the vibration plane of the electric field vector is parallel to the incident plane.
  • s-polarized light means polarized light that vibrates in a direction perpendicular to the light incident surface.
  • the front phase difference is a value measured using an AxoScan manufactured by Axometrics. The measurement wavelength is 550 nm.
  • the front phase difference may be a value measured by making light having a wavelength in the visible light wavelength region incident in the normal direction of the film in KOBRA 21ADH or WR (manufactured by Oji Scientific Instruments).
  • the wavelength selection filter can be exchanged manually, or the measurement value can be converted by a program or the like.
  • the birefringence ( ⁇ n) of a liquid crystal compound is the same as that described in “Liquid Crystal / Fundamentals (Mitsoji Okano, Keisuke Kobayashi)” p. It is a value measured according to the method described in 214. Specifically, ⁇ n at 60 ° C. can be obtained by injecting a liquid crystal compound into a wedge-shaped cell, irradiating it with light having a wavelength of 550 nm, and measuring the refraction angle of transmitted light.
  • projection image means an image based on the projection of light from a projector to be used, not a surrounding landscape such as the front.
  • the projected image is observed as a virtual image that appears above the projected image display portion of the windshield glass as viewed from the observer.
  • screen image means an image displayed on a drawing device of a projector or an image drawn on an intermediate image screen or the like by the drawing device.
  • an image is a real image. Both the image and the projected image may be a single color image, a multicolor image of two or more colors, or a full color image.
  • the windshield glass means a window glass for vehicles such as cars, trains, airplanes, ships, play equipment and the like.
  • the windshield glass is preferably a windshield in the direction of travel of the vehicle.
  • the windshield glass is preferably a vehicle windshield.
  • the windshield glass may be flat.
  • the windshield glass may be formed for incorporation into an applied vehicle, and may have a curved surface, for example.
  • a direction that is upward (vertically upward) and a surface that is an observer side can be specified during normal use.
  • the windshield glass or the projected image display part when it is vertically above, it means the direction that is vertically above when it can be specified as described above.
  • the windshield glass of the present invention has a laminated glass structure in which two glass plates are bonded via an intermediate layer, and includes a first glass plate, a first resin film, a half mirror film, and a second glass plate. A resin film and a second glass plate are included in this order.
  • the windshield glass of the present invention further includes a specific base material, and the half mirror film is adjacent to the base material.
  • the glass plate on the outside is referred to as the first glass plate
  • the glass plate on the indoor side is referred to as the second glass plate.
  • the glass plate located farther from the observer (driver) side is called the first glass plate
  • the glass plate located closer is called the second glass plate.
  • the term “glass plate” means both the first glass plate and the second glass plate.
  • the glass plate a glass plate generally used for windshield glass can be used.
  • the thickness of the glass plate is not particularly limited, but is preferably about 0.5 mm to 5 mm, more preferably 1 mm to 3 mm, and further preferably 1.6 mm to 2.3 mm.
  • the thicknesses of the first glass plate and the second glass plate may be the same or different from each other.
  • the first glass plate may be 1.9 mm to 2.5 mm
  • the second glass plate may be 1.6 mm to 1.9 mm.
  • the glass plate may be subjected to surface treatment for imparting water repellency, hydrophilicity, or antifogging property to the surface thereof.
  • the glass plate is preferably cut into the shape of windshield glass. Moreover, it is preferable to have a curved surface.
  • the curved surface can be provided by placing the cut glass plate on a jig having the same curvature as the windshield glass to be manufactured and heating (for example, 600 to 700 ° C.).
  • the resin film on the outside is referred to as a first resin film
  • the resin film on the indoor side is referred to as a second resin film.
  • the resin film located farther from the observer (driver) side is called the first resin film
  • the resin film located closer is called the second resin film.
  • the first resin film and the second resin film may be the same or different in material, thickness, and the like. The materials are preferably the same, and more preferably the materials and thickness are the same.
  • the term “resin film” means both the first resin film and the second resin film.
  • the resin film may have the same shape and area as the first glass plate. For example, in the laminated glass manufacturing process, after the resin film unwound from the roll form is sandwiched between the first glass plate and the second glass plate, it may be trimmed into the shape of the first glass plate. .
  • a well-known resin film can be used as a sheet
  • the resin film contains a resin as a main component.
  • the main component refers to a component that occupies a ratio of 50% by mass or more of the resin film.
  • the resin is preferably a synthetic resin.
  • a thermoplastic resin can be used as the resin.
  • the thermoplastic resin include thermoplastic resins conventionally used for interlayer applications in laminated glass, such as polyvinyl acetal, polyvinyl chloride, saturated polyester, polyurethane, ethylene-vinyl acetate copolymer, ethylene. -Ethyl acrylate copolymer and the like.
  • polyvinyl acetal is preferable from the viewpoints of transparency, strength, light resistance, and the like.
  • Polyvinyl acetal is a general term for resins obtained by acetalizing polyvinyl alcohol with an aldehyde in the presence of an acid.
  • polyvinyl formal acetalized with formalin formaldehyde 37% aqueous solution
  • butanol butyl alcohol
  • PVB acetalized polyvinyl butyral
  • polyvinyl butyral or ethylene-vinyl acetate copolymer is preferable, and polyvinyl butyral is more preferable.
  • polyvinyl butyral can be obtained by acetalizing polyvinyl alcohol with butyraldehyde.
  • the preferable lower limit of the degree of acetalization of the polyvinyl butyral is 40%, the preferable upper limit is 85%, the more preferable lower limit is 60%, and the more preferable upper limit is 75%.
  • Polyvinyl alcohol is usually obtained by saponifying polyvinyl acetate, and polyvinyl alcohol having a saponification degree of 80 to 99.8 mol% is generally used. Moreover, the preferable minimum of the polymerization degree of the said polyvinyl alcohol is 200, and a preferable upper limit is 3000. When the polymerization degree of polyvinyl alcohol is 200 or more, the penetration resistance of the obtained laminated glass is difficult to decrease, and when it is 3000 or less, the moldability of the resin film is good, and the rigidity of the resin film does not increase too much. Good workability. A more preferred lower limit is 500, and a more preferred upper limit is 2000.
  • the resin is also preferably plasticized by the addition of a plasticizer.
  • a plasticizer phosphate ester, carboxylic acid ester, sugar ester, polycondensation ester, or the like is used.
  • the addition amount of the plasticizer is preferably 10 parts by mass or more and 80 parts by mass or less with respect to 100 parts by mass of the resin.
  • the thermoplastic resin can be sufficiently plasticized.
  • strength of a resin layer can fully be maintained by the addition amount of a plasticizer being 80 mass parts or less.
  • the resin film or the composition for forming the resin film is an infrared shielding fine particle, an adhesion adjusting agent, a coupling agent, a surfactant, an antioxidant, a heat stabilizer, a light stabilizer,
  • an ultraviolet absorber such as an ultraviolet absorber, a fluorescent agent, a dehydrating agent, an antifoaming agent, an antistatic agent, and a flame retardant may be included.
  • the thickness of the resin film is, for example, preferably 0.1 mm to 1.5 mm, and more preferably 0.2 mm to 1.0 mm.
  • the windshield glass of the present invention includes a half mirror film in the intermediate layer of the laminated glass.
  • a projected image display portion capable of simultaneously displaying an image projected in a head-up display system and a front landscape can be formed on the windshield glass.
  • the projected image display part is a part capable of displaying a projected image with reflected light, and may be any part capable of displaying the projected image projected from a projector or the like so as to be visible.
  • the windshield glass of the present invention is used in a head-up display system, an image projected from a projector can be displayed on a half mirror film portion so as to be visible, and a half mirror is displayed from the same surface side on which the image is displayed.
  • the half mirror film has a function as an optical path combiner that displays external light and video light in a superimposed manner.
  • the half mirror film may be provided on the entire surface of the windshield glass, or may be provided in part with respect to the entire area of the windshield glass, but is preferably provided in part.
  • the upper limit is 90% or less, 50% or less, 40% or less, 30% or less, 20% or less, 10% or less, 5% or less, etc. with respect to the total area of the windshield glass.
  • the lower limit may be 1% or more, 3% or more, 5% or more, 7% or more, 10% or more.
  • the half mirror film may be provided in any position of the windshield glass, but when used as a head-up display system, the position is easily visible from an observer (for example, a driver). Are preferably provided so that a virtual image is shown.
  • the position where the half mirror film is provided may be determined from the relationship between the position of the driver's seat of the applied vehicle and the position where the projector is installed. Specifically, it is preferably disposed at an angle that the driver looks down, and is preferably disposed at a position below the center of the windshield glass.
  • the half mirror film may have a flat shape that does not have a curved surface, but may have a curved surface, and has a concave or convex shape as a whole.
  • the image may be displayed enlarged or reduced.
  • the thickness of the half mirror film is preferably 2.5 ⁇ m to 35 ⁇ m, more preferably 3.0 ⁇ m to 30 ⁇ m, and even more preferably 3.5 ⁇ m to 25 ⁇ m.
  • the half mirror film only needs to have a function as a half mirror for at least projection light. However, for example, it does not need to function as a half mirror for light in the entire visible light range. Moreover, the half mirror film should just have said function with respect to the light of at least one part incident angle.
  • the half mirror film has visible light transmittance in order to enable observation of information or scenery on the opposite surface side.
  • the half mirror film may have a light transmittance of 40% or more, preferably 50% or more, more preferably 60% or more, and further preferably 70% or more in the visible light wavelength region.
  • the light transmittance is the light transmittance determined by the method described in JIS-K7105.
  • Half mirror film includes a circularly polarized reflective layer.
  • the half mirror film may further include a retardation layer.
  • the circularly polarized light reflecting layer and the retardation layer may be prepared separately and adhered to each other to form a half mirror film, or the retardation layer on the circularly polarized light reflecting layer (cholesteric liquid crystal layer).
  • a half mirror film may be formed by forming a circularly polarized light reflecting layer (cholesteric liquid crystal layer) on the retardation layer.
  • the half mirror film may include layers such as a second retardation layer, an alignment layer, a support, and an adhesive layer described later in addition to the circularly polarized light reflection layer and the retardation layer.
  • the half mirror film used for producing the windshield glass of the present invention may be a film shape, a sheet shape, or a plate shape.
  • the half mirror film may be formed as a thin film in a roll shape or the like, and thereafter used for producing the windshield glass of the present invention.
  • the circularly polarized light reflecting layer is a layer that reflects light.
  • the circularly polarized light reflection layer includes a cholesteric liquid crystal layer.
  • the circularly polarized light reflecting layer may include other layers such as an alignment layer.
  • the thickness of the circularly polarized light reflection layer is preferably 2.0 ⁇ m to 30 ⁇ m, more preferably 2.5 ⁇ m to 25 ⁇ m, and even more preferably 3.0 ⁇ m to 20 ⁇ m.
  • a cholesteric liquid crystal layer means a layer in which a cholesteric liquid crystal phase is fixed.
  • the cholesteric liquid crystal layer is sometimes simply referred to as a liquid crystal layer.
  • the cholesteric liquid crystal layer may be a layer that maintains the orientation of the liquid crystal compound that is in the cholesteric liquid crystal phase.
  • a cholesteric liquid crystal layer typically has a polymerizable liquid crystal compound in an aligned state of a cholesteric liquid crystal phase, and is then polymerized and cured by ultraviolet irradiation, heating, etc. to form a layer having no fluidity, and at the same time, Any layer may be used as long as the orientation is not changed by an external field or an external force.
  • the optical properties of the cholesteric liquid crystal phase are maintained in the layer, and the liquid crystal compound in the layer may no longer exhibit liquid crystallinity.
  • the polymerizable liquid crystal compound may have a high molecular weight due to a curing reaction and may no longer have liquid crystallinity.
  • the cholesteric liquid crystal phase exhibits circularly polarized light selective reflection that selectively reflects the circularly polarized light of either the right circularly polarized light or the left circularly polarized light and transmits the circularly polarized light of the other sense.
  • the circularly polarized light selective reflection is sometimes simply referred to as selective reflection.
  • Many films formed from a composition containing a polymerizable liquid crystal compound have been known as a film containing a layer in which a cholesteric liquid crystal phase exhibiting circularly polarized light selectively is fixed. You can refer to the technology.
  • the central wavelength ⁇ of selective reflection of the cholesteric liquid crystal layer means a wavelength at the center of gravity of the reflection peak of the circularly polarized reflection spectrum measured from the normal direction of the cholesteric liquid crystal layer.
  • the selective reflection center wavelength and the half-value width of the cholesteric liquid crystal layer can be obtained as follows.
  • the transmission spectrum of the cholesteric liquid crystal layer (measured from the normal direction of the cholesteric liquid crystal layer) is measured using a spectrophotometer, a drop in transmittance is observed in the selective reflection band.
  • the wavelength value on the short wavelength side is ⁇ l (nm)
  • the wavelength value on the long wavelength side Is ⁇ h (nm)
  • the center wavelength ⁇ and the half-value width ⁇ of selective reflection can be expressed by the following equations.
  • the selective reflection center wavelength obtained as described above substantially matches the wavelength at the center of gravity of the reflection peak of the circularly polarized reflection spectrum measured from the normal direction of the cholesteric liquid crystal layer.
  • Examples of the spectrophotometer include UV3150 manufactured by Shimadzu Corporation and V-670 manufactured by JASCO.
  • the center wavelength of selective reflection can be adjusted by adjusting the pitch of the helical structure.
  • the cholesteric liquid crystal layer exhibiting selective reflection in the visible light region preferably has a center wavelength of selective reflection in the visible light region.
  • the center wavelength ⁇ is adjusted to selectively reflect either the right circularly polarized light or the left circularly polarized light with respect to red light, green light, and blue light. be able to.
  • a windshield glass is used so that light is incident obliquely with respect to a circularly polarized reflective layer in order to reduce double images caused by reflection of projection light on the front or back surface of the glass. It is preferable.
  • ⁇ d n 2 ⁇ P ⁇ cos ⁇ 2
  • n ⁇ P may be adjusted by inserting this angle and the center wavelength of the desired selective reflection into the above equation.
  • the pitch of the cholesteric liquid crystal phase depends on the type of chiral agent used together with the polymerizable liquid crystal compound or the concentration of the chiral agent, the desired pitch can be obtained by adjusting these.
  • the method of measuring spiral sense and pitch use the methods described in “Introduction to Liquid Crystal Chemistry Experiments”, edited by the Japanese Liquid Crystal Society, Sigma Publishing 2007, page 46, and “Liquid Crystal Handbook”, Liquid Crystal Handbook Editing Committee, page 196. be able to.
  • the circularly polarized light reflecting layer preferably includes three or more cholesteric liquid crystal layers.
  • the circularly polarized light reflection layer preferably includes three or more cholesteric liquid crystal layers having a central wavelength of selective reflection in the visible light region. Further, it is preferable that the central wavelengths of selective reflection of the three or more cholesteric liquid crystal layers are different from each other.
  • the circularly polarized light reflection layer preferably has an apparent selective reflection center wavelength with respect to red light, green light, and blue light.
  • the apparent center wavelength of selective reflection means the wavelength at the center of gravity of the reflection peak of the circularly polarized reflection spectrum of the cholesteric liquid crystal layer measured from the observation direction in practical use.
  • the circularly polarized light reflection layer may include a cholesteric liquid crystal layer that selectively reflects red light, a cholesteric liquid crystal layer that selectively reflects green light, and a cholesteric liquid crystal layer that selectively reflects blue light. preferable.
  • the circularly polarized light reflecting layer has, for example, a cholesteric liquid crystal layer having a central wavelength of selective reflection at 490 nm to 600 nm, a cholesteric liquid crystal layer having a central wavelength of selective reflection at 600 nm to 680 nm, and a central wavelength of selective reflection at 680 nm to 850 nm. It is preferable to include a cholesteric liquid crystal layer.
  • Displaying a clear projected image with high light utilization efficiency by adjusting the center wavelength of selective reflection of the cholesteric liquid crystal layer to be used according to the emission wavelength range of the light source used for projection and the usage of the circularly polarized reflective layer Can do.
  • a clear color projection image can be displayed with high light utilization efficiency.
  • usage of the circularly polarized light reflecting layer include the incident angle of the projected light on the circularly polarized light reflecting layer, the direction in which the projected image is observed, and the like.
  • the circularly polarized light reflection layer includes four or more cholesteric liquid crystal layers, and the central wavelengths of selective reflection of the four or more cholesteric liquid crystal layers are different from each other.
  • each cholesteric liquid crystal layer a cholesteric liquid crystal layer whose spiral sense is either right or left is used.
  • the sense of reflected circularly polarized light in the cholesteric liquid crystal layer coincides with the sense of a spiral.
  • the spiral senses of the cholesteric liquid crystal layers having different selective reflection center wavelengths may all be the same or may include different ones, but are preferably the same.
  • a plurality of cholesteric liquid crystal layers having the same pitch P and the same spiral sense may be stacked. By laminating cholesteric liquid crystal layers having the same pitch P and the same spiral sense, the circularly polarized light selectivity can be increased at a specific wavelength.
  • the half width ⁇ of selective reflection can be 15 nm to 200 nm, 15 nm to 150 nm, 20 nm to 100 nm, or the like.
  • the circularly polarized light reflection layer preferably includes at least one cholesteric liquid crystal layer having a selective reflection half width ⁇ of 50 nm or less.
  • a cholesteric liquid crystal layer having a selective reflection half-value width ⁇ of 50 nm or less may be referred to as a narrow-band selective reflection layer.
  • the circularly polarized light reflecting layer includes two narrow band selective reflecting layers.
  • the cholesteric liquid crystal layer having the apparent center wavelength of selective reflection for green light and blue light is preferably a narrow-band selective reflection layer.
  • the cholesteric liquid crystal layer having the apparent center wavelength of selective reflection with respect to green light and blue light is a narrow-band selective reflection layer, a projection image that provides a clear projection image without impairing the transparency of the windshield glass. It is possible to form an image display part.
  • the thickness of the cholesteric liquid crystal layer is preferably 0.3 ⁇ m to 10 ⁇ m, more preferably 0.4 ⁇ m to 8.0 ⁇ m, and even more preferably 0.5 ⁇ m to 6.0 ⁇ m.
  • a separately prepared cholesteric liquid crystal layer may be laminated using an adhesive or the like, and the polymerizable liquid crystal is directly applied to the surface of the previous cholesteric liquid crystal layer formed by the method described later.
  • a liquid crystal composition containing a compound or the like may be applied and the alignment and fixing steps may be repeated, but the latter is preferred.
  • the orientation direction of the liquid crystal molecules on the air interface side of the previously formed cholesteric liquid crystal layer and the cholesteric liquid crystal layer formed thereon This is because the orientation directions of the lower liquid crystal molecules coincide with each other, and the polarization property of the laminate of cholesteric liquid crystal layers is improved. Moreover, interference unevenness that may be caused by unevenness in the thickness of the adhesive layer is not observed.
  • Short wavelength cholesteric liquid crystal layer When the circularly polarized light reflection layer includes four or more cholesteric liquid crystal layers, one of these cholesteric liquid crystal layers is a cholesteric liquid crystal layer (hereinafter referred to as “short wavelength cholesteric liquid crystal layer) having a central wavelength of selective reflection at 350 nm or more and less than 490 nm. It is also preferable to include a “liquid crystal layer”.
  • the configuration including the circularly polarized light reflection layer and the ⁇ / 2 retardation layer is provided on the windshield glass as the projected image display portion, the present inventors have observed the projected image display portion in the windshield glass under the external light. It was discovered that the color (especially yellow) was confirmed.
  • the above-mentioned color is felt in the projected image display part even when the windshield glass is observed under the external light.
  • the projection image display part can be made inconspicuous from the outside.
  • the optical design is made on the assumption that light is incident obliquely with respect to the circularly polarized reflective layer in order to reduce the double image using the Brewster angle.
  • a cholesteric liquid crystal layer having a central wavelength of selective reflection at 350 nm or more and less than 490 nm it is possible to reduce glare that can be felt through polarized sunglasses when observing external light through a projected image display part.
  • s-polarized light based on reflected light from the ground or water surface that is not visually recognized through polarized sunglasses can be converted into a light component that is visually recognized by changing the polarization state at the projected image display site, and this light component is 350 nm. This is considered to be reduced by using a cholesteric liquid crystal layer having a central wavelength of selective reflection below 490 nm.
  • the cholesteric liquid crystal layer having a central wavelength of selective reflection at 350 nm or more and less than 490 nm preferably has a central wavelength of selective reflection at 370 nm to 485 nm, more preferably has a central wavelength of selective reflection at 390 nm to 480 nm. More preferably, it has a central wavelength of selective reflection at 470 nm.
  • the short wavelength cholesteric liquid crystal layer may have an apparent selective reflection center wavelength of 280 nm or more and less than 420 nm, preferably 300 nm or more and less than 410 nm, preferably 320 nm or more and less than 400 nm when used in a head-up display system. Is more preferably 340 nm or more and less than 395 nm.
  • the short-wavelength cholesteric liquid crystal layer in the circularly polarized light reflection layer is the most retardation layer (first retardation described later) among four or more cholesteric liquid crystal layers. Preferably it is on the layer) side. This is because the double image is further reduced.
  • the cholesteric liquid crystal layer is preferably arranged in order from the one having the shortest central wavelength of selective reflection as viewed from the phase difference layer (first phase difference layer described later) side.
  • a retardation layer, a cholesteric liquid crystal layer having a central wavelength of selective reflection at 350 nm to less than 490 nm, a cholesteric liquid crystal layer having a central wavelength of selective reflection at 490 to 600 nm, and a cholesteric liquid crystal having a central wavelength of selective reflection at 600 to 680 nm It is preferable that a cholesteric liquid crystal layer having a central wavelength of selective reflection at 680 nm to 850 nm is disposed in this order.
  • cholesteric liquid crystal layer a manufacturing material and a manufacturing method of the cholesteric liquid crystal layer
  • the material used for forming the cholesteric liquid crystal layer include a liquid crystal composition containing a polymerizable liquid crystal compound and a chiral agent (optically active compound). If necessary, apply the above liquid crystal composition mixed with a surfactant or a polymerization initiator and dissolved in a solvent to the support, alignment layer, cholesteric liquid crystal layer as a lower layer, etc.
  • a cholesteric liquid crystal layer can be formed by being fixed by curing the liquid crystal composition.
  • the polymerizable liquid crystal compound may be a rod-like liquid crystal compound or a disk-like liquid crystal compound, but is preferably a rod-like liquid crystal compound.
  • Examples of the rod-like polymerizable liquid crystal compound forming the cholesteric liquid crystal layer include a rod-like nematic liquid crystal compound.
  • rod-like nematic liquid crystal compounds examples include azomethines, azoxys, cyanobiphenyls, cyanophenyl esters, benzoic acid esters, cyclohexanecarboxylic acid phenyl esters, cyanophenylcyclohexanes, cyano-substituted phenylpyrimidines, alkoxy-substituted phenylpyrimidines.
  • Phenyldioxanes, tolanes and alkenylcyclohexylbenzonitriles are preferably used. Not only low-molecular liquid crystal compounds but also high-molecular liquid crystal compounds can be used.
  • the polymerizable liquid crystal compound can be obtained by introducing a polymerizable group into the liquid crystal compound.
  • the polymerizable group include an unsaturated polymerizable group, an epoxy group, and an aziridinyl group, preferably an unsaturated polymerizable group, and particularly preferably an ethylenically unsaturated polymerizable group.
  • the polymerizable group can be introduced into the molecule of the liquid crystal compound by various methods.
  • the number of polymerizable groups contained in the polymerizable liquid crystal compound is preferably 1 to 6, more preferably 1 to 3 in one molecule. Examples of polymerizable liquid crystal compounds are described in Makromol. Chem. 190, 2255 (1989), Advanced Materials, 5, 107 (1993), US Pat. No.
  • the addition amount of the polymerizable liquid crystal compound in the liquid crystal composition is preferably 80 to 99.9% by mass with respect to the solid content mass (mass excluding the solvent) of the liquid crystal composition, and is preferably 85 to 99. It is more preferably 5% by mass, particularly preferably 90 to 99% by mass.
  • a narrow band is obtained by forming a cholesteric liquid crystal phase using a low ⁇ n polymerizable liquid crystal compound and fixing it to a film.
  • a selective reflection layer can be obtained.
  • the low ⁇ n polymerizable liquid crystal compound include compounds described in International Publications WO2015 / 115390, WO2015 / 147243, WO2016 / 035873, JP2015-163596, and JP2016-53149A.
  • the description of WO2016 / 047648 can also be referred to for the liquid crystal composition providing a selective reflection layer having a small half width.
  • the liquid crystal compound is also preferably a polymerizable compound represented by the following formula (I) described in WO2016 / 047648.
  • A represents a phenylene group which may have a substituent or a trans-1,4-cyclohexylene group which may have a substituent
  • L is a single bond, —CH 2 O—, —OCH 2 —, — (CH 2 ) 2 OC ( ⁇ O) —, —C ( ⁇ O) O (CH 2 ) 2 —, —C ( ⁇ O) O Selected from the group consisting of —, —OC ( ⁇ O) —, —OC ( ⁇ O) O—, —CH ⁇ CH—C ( ⁇ O) O—, and —OC ( ⁇ O) —CH ⁇ CH—.
  • a linking group m represents an integer of 3 to 12
  • Sp 1 and Sp 2 are each independently one or more of a single bond, a linear or branched alkylene group having 1 to 20 carbon atoms, and a linear or branched alkylene group having 1 to 20 carbon atoms.
  • CH 2 — is —O—, —S—, —NH—, —N (CH 3 ) —, —C ( ⁇ O) —, —OC ( ⁇ O) —, or —C ( ⁇ O) O—.
  • * represents a bonding position.
  • the phenylene group is preferably a 1,4-phenylene group.
  • the phenylene group and trans-1,4-cyclohexylene group may have 1 to 4 substituents. When it has two or more substituents, the two or more substituents may be the same or different from each other.
  • the alkyl group may be linear or branched.
  • the alkyl group preferably has 1 to 30 carbon atoms, more preferably 1 to 10 carbon atoms, and particularly preferably 1 to 6 carbon atoms.
  • Examples of the alkyl group include, for example, methyl group, ethyl group, n-propyl group, isopropyl group, n-butyl group, isobutyl group, sec-butyl group, tert-butyl group, n-pentyl group, isopentyl group, neopentyl group.
  • alkyl group a 1,1-dimethylpropyl group, n-hexyl group, isohexyl group, linear or branched heptyl group, octyl group, nonyl group, decyl group, undecyl group, or dodecyl group.
  • alkyl group is the same for the alkoxy group containing an alkyl group.
  • specific examples of the alkylene group referred to as an alkylene group include a divalent group obtained by removing one arbitrary hydrogen atom in each of the above examples of the alkyl group.
  • the halogen atom include a fluorine atom, a chlorine atom, a bromine atom, and an iodine atom.
  • the cycloalkyl group preferably has 3 to 20 carbon atoms, more preferably 5 or more, more preferably 10 or less, still more preferably 8 or less, and still more preferably 6 or less.
  • Examples of the cycloalkyl group include a cyclopropyl group, a cyclobutyl group, a cyclopentyl group, a cyclohexyl group, a cycloheptyl group, and a cyclooctyl group.
  • the substituents that the phenylene group and the trans-1,4-cyclohexylene group may have are particularly an alkyl group, an alkoxy group, and a group consisting of —C ( ⁇ O) —X 3 —Sp 3 —Q 3 Substituents selected from are preferred.
  • X 3 represents a single bond, —O—, —S—, or —N (Sp 4 -Q 4 ) —, or represents a nitrogen atom that forms a ring structure with Q 3 and Sp 3. Show.
  • Sp 3 and Sp 4 are each independently one or more of a single bond, a linear or branched alkylene group having 1 to 20 carbon atoms, and a linear or branched alkylene group having 1 to 20 carbon atoms.
  • CH 2 — is —O—, —S—, —NH—, —N (CH 3 ) —, —C ( ⁇ O) —, —OC ( ⁇ O) —, or —C ( ⁇ O) O—.
  • a linking group selected from the group consisting of substituted groups is shown.
  • Q 3 and Q 4 are each independently a hydrogen atom, a cycloalkyl group, or a cycloalkyl group, wherein one or more —CH 2 — is —O—, —S—, —NH—, —N (CH 3 ) —, —C ( ⁇ O) —, —OC ( ⁇ O) —, or a group substituted with —C ( ⁇ O) O—, or a group represented by Formulas Q-1 to Q-5 Any polymerizable group selected from the group consisting of:
  • —CH 2 — is —O—, —S—, —NH—, —N (CH 3 ) —, —C ( ⁇ O) —, —OC ( ⁇ O).
  • group substituted with — or —C ( ⁇ O) O— include a tetrahydrofuranyl group, a pyrrolidinyl group, an imidazolidinyl group, a pyrazolidinyl group, a piperidyl group, a piperazinyl group, and a morpholinyl group.
  • the substitution position is not particularly limited. Of these, tetrahydrofuranyl group is preferable, and 2-tetrahydrofuranyl group is particularly preferable.
  • L represents a single bond, —CH 2 O—, —OCH 2 —, — (CH 2 ) 2 OC ( ⁇ O) —, —C ( ⁇ O) O (CH 2 ) 2 —, — C ( ⁇ O) O—, —OC ( ⁇ O) —, —OC ( ⁇ O) O—, —CH ⁇ CH—C ( ⁇ O) O—, —OC ( ⁇ O) —CH ⁇ CH—,
  • a linking group selected from the group consisting of: L is preferably —C ( ⁇ O) O— or —OC ( ⁇ O) —.
  • the m-1 Ls may be the same as or different from each other.
  • Sp 1 and Sp 2 are each independently one or more of a single bond, a linear or branched alkylene group having 1 to 20 carbon atoms, and a linear or branched alkylene group having 1 to 20 carbon atoms.
  • CH 2 — is —O—, —S—, —NH—, —N (CH 3 ) —, —C ( ⁇ O) —, —OC ( ⁇ O) —, or —C ( ⁇ O) O—.
  • a linking group selected from the group consisting of substituted groups is shown.
  • Sp 1 and Sp 2 each independently has 1 carbon atom to which a linking group selected from the group consisting of —O—, —OC ( ⁇ O) —, and —C ( ⁇ O) O— is bonded to both ends.
  • Q 1 and Q 2 each independently represent a hydrogen atom or a polymerizable group selected from the group consisting of groups represented by the above formulas Q-1 to Q-5, provided that Q 1 and Q 2 Either one represents a polymerizable group.
  • a polymerizable group an acryloyl group (formula Q-1) or a methacryloyl group (formula Q-2) is preferable.
  • m represents an integer of 3 to 12, preferably an integer of 3 to 9, more preferably an integer of 3 to 7, and further preferably an integer of 3 to 5.
  • the polymerizable compound represented by the formula (I) has at least one phenylene group which may have a substituent as A and a trans-1,4-cyclohexylene group which may have a substituent. It is preferable to include at least one.
  • the polymerizable compound represented by the formula (I) preferably contains 1 to 4 trans-1,4-cyclohexylene groups which may have a substituent as A, and preferably 1 to 3 Is more preferable, and it is more preferable that 2 or 3 is included.
  • A preferably contains at least one phenylene group which may have a substituent, more preferably 1 to 4, more preferably 1 to 1. It is more preferable to include three, and it is particularly preferable to include two or three.
  • polymerizable compound represented by the formula (I) include, in addition to the compounds described in paragraphs 0051 to 0058 of WO2016 / 047648, JP2013-112163A, JP2010-70543A, Examples thereof include compounds described in Japanese Patent No. 4725516, International Publication Nos. WO2015 / 115390, WO2015 / 147243, WO2016 / 035873, JP2015-163596A, and JP2016-53149A.
  • the chiral agent has a function of inducing a helical structure of a cholesteric liquid crystal phase.
  • the chiral compound may be selected according to the purpose because the helical sense or helical pitch induced by the compound is different.
  • limiting in particular as a chiral agent A well-known compound can be used.
  • Examples of chiral agents include liquid crystal device handbook (Chapter 3, Section 4-3, TN, chiral agent for STN, 199 pages, edited by Japan Society for the Promotion of Science, 142th Committee, 1989), JP-A 2003-287623, Examples thereof include compounds described in JP-A No. 2002-302487, JP-A No. 2002-80478, JP-A No. 2002-80851, JP-A No. 2010-181852 or JP-A No. 2014-034581.
  • a chiral agent generally contains an asymmetric carbon atom, but an axially asymmetric compound or a planar asymmetric compound containing no asymmetric carbon atom can also be used as the chiral agent.
  • the axial asymmetric compound or the planar asymmetric compound include binaphthyl, helicene, paracyclophane, and derivatives thereof.
  • the chiral agent may have a polymerizable group. When both the chiral agent and the liquid crystal compound have a polymerizable group, they are derived from the repeating unit derived from the polymerizable liquid crystal compound and the chiral agent by a polymerization reaction between the polymerizable chiral agent and the polymerizable liquid crystal compound.
  • the polymerizable group possessed by the polymerizable chiral agent is preferably the same group as the polymerizable group possessed by the polymerizable liquid crystal compound. Therefore, the polymerizable group of the chiral agent is also preferably an unsaturated polymerizable group, an epoxy group or an aziridinyl group, more preferably an unsaturated polymerizable group, and an ethylenically unsaturated polymerizable group. Particularly preferred.
  • the chiral agent may be a liquid crystal compound.
  • an isosorbide derivative As the chiral agent, an isosorbide derivative, an isomannide derivative, or a binaphthyl derivative can be preferably used.
  • an isosorbide derivative a commercial product such as LC-756 manufactured by BASF may be used.
  • the content of the chiral agent in the liquid crystal composition is preferably 0.01 mol% to 200 mol%, more preferably 1 mol% to 30 mol%, based on the amount of the polymerizable liquid crystal compound.
  • the liquid crystal composition preferably contains a polymerization initiator.
  • the polymerization initiator to be used is preferably a photopolymerization initiator that can start the polymerization reaction by ultraviolet irradiation.
  • photopolymerization initiators include ⁇ -carbonyl compounds (described in US Pat. No. 2,367,661 and US Pat. No. 2,367,670), acyloin ethers (described in US Pat. No. 2,448,828), ⁇ -hydrocarbons.
  • a substituted aromatic acyloin compound (described in US Pat. No.
  • acyl phosphine oxide compound As the polymerization initiator, it is also preferable to use an acyl phosphine oxide compound or an oxime compound.
  • acylphosphine oxide compound for example, IRGACURE 810 (compound name: bis (2,4,6-trimethylbenzoyl) -phenylphosphine oxide) manufactured by BASF Japan Ltd. can be used.
  • Examples of the oxime compounds include IRGACURE OXE01 (manufactured by BASF), IRGACURE OXE02 (manufactured by BASF), TR-PBG-304 (manufactured by Changzhou Strong Electronic New Materials Co., Ltd.), Adeka Arcles NCI-831, Adeka Arcles NCI-930 Commercial products such as (ADEKA) and Adeka Arcles NCI-831 (ADEKA) can be used. Only one type of polymerization initiator may be used, or two or more types may be used in combination.
  • the content of the photopolymerization initiator in the liquid crystal composition is preferably 0.1% by mass to 20% by mass, and preferably 0.5% by mass to 5% by mass with respect to the content of the polymerizable liquid crystal compound. It is more preferable.
  • the liquid crystal composition may optionally contain a crosslinking agent in order to improve the film strength after curing and improve the durability.
  • a crosslinking agent one that can be cured by ultraviolet rays, heat, moisture, or the like can be suitably used.
  • polyfunctional acrylate compounds such as a trimethylol propane tri (meth) acrylate and pentaerythritol tri (meth) acrylate
  • Glycidyl (meth) acrylate Epoxy compounds such as ethylene glycol diglycidyl ether; aziridine compounds such as 2,2-bishydroxymethylbutanol-tris [3- (1-aziridinyl) propionate], 4,4-bis (ethyleneiminocarbonylamino) diphenylmethane; hexa Isocyanate compounds such as methylene diisocyanate and biuret type isocyanate; polyoxazoline compounds having an oxazoline group in the side chain; vinyltrimethoxysilane, N- (2-aminoethyl) 3-aminopropylto Alkoxysilane compounds such as methoxy silane.
  • a well-known catalyst can be used according to the reactivity of a crosslinking agent, and productivity can be improved in addition to membrane strength and durability improvement. These may be used individually by 1 type and may use 2 or more types together.
  • the content of the crosslinking agent is preferably 3% by mass to 20% by mass, and more preferably 5% by mass to 15% by mass. By making the content of the crosslinking agent 3% by mass or more, the effect of improving the crosslinking density can be obtained, and by making the content of the crosslinking agent 20% by mass or less, the stability of the cholesteric liquid crystal layer is lowered. Can be prevented.
  • an alignment control agent that contributes to stably or rapidly forming a cholesteric liquid crystal layer having a planar alignment may be added.
  • the alignment control agent include fluorine (meth) acrylate polymers described in paragraphs [0018] to [0043] of JP-A-2007-272185, and paragraphs [0031] to [0034] of JP-A-2012-203237. And compounds represented by the formulas (I) to (IV) as described above.
  • 1 type may be used independently and 2 or more types may be used together.
  • the addition amount of the alignment control agent in the liquid crystal composition is preferably 0.01% by mass to 10% by mass, more preferably 0.01% by mass to 5% by mass with respect to the total mass of the polymerizable liquid crystal compound. 0.02% by mass to 1% by mass is particularly preferable.
  • the liquid crystal composition may contain at least one selected from various additives such as a surfactant for adjusting the surface tension of the coating film and making the thickness uniform, and a polymerizable monomer.
  • a polymerization inhibitor, an antioxidant, an ultraviolet absorber, a light stabilizer, a colorant, metal oxide fine particles, etc. are added to the liquid crystal composition as necessary, as long as optical performance is not deteriorated. can do.
  • a cholesteric liquid crystal layer is prepared by preparing a liquid crystal composition in which a polymerizable liquid crystal compound and a polymerization initiator, a chiral agent added as necessary, a surfactant, and the like are dissolved in a solvent, a support, an alignment layer, or first.
  • a cholesteric liquid crystal layer in which the cholesteric regularity is fixed by coating the cholesteric liquid crystal layer on the coated cholesteric liquid crystal layer and drying to obtain a coating film, and irradiating the coating film with actinic rays to polymerize the cholesteric liquid crystalline composition Can be formed.
  • the laminated film which consists of a some cholesteric liquid crystal layer can be formed by repeating the said manufacturing process of a cholesteric liquid crystal layer.
  • solvent there is no restriction
  • the organic solvent is not particularly limited and may be appropriately selected depending on the intended purpose. For example, ketones, alkyl halides, amides, sulfoxides, heterocyclic compounds, hydrocarbons, esters, ethers, etc. Is mentioned. These may be used individually by 1 type and may use 2 or more types together. Among these, ketones are particularly preferable in consideration of environmental load.
  • the method for applying the liquid crystal composition to the support, the alignment layer, the underlying cholesteric liquid crystal layer, etc. is not particularly limited and can be appropriately selected according to the purpose.
  • a wire bar coating method, a curtain coating method examples include extrusion coating, direct gravure coating, reverse gravure coating, die coating, spin coating, dip coating, spray coating, and slide coating. It can also be carried out by transferring a liquid crystal composition separately coated on a support.
  • the liquid crystal molecules are aligned by heating the applied liquid crystal composition.
  • the heating temperature is preferably 200 ° C. or lower, and more preferably 130 ° C. or lower.
  • the liquid crystal composition can be cured by further polymerizing the aligned liquid crystal compound.
  • the polymerization may be either thermal polymerization or photopolymerization utilizing light irradiation, but photopolymerization is preferred. It is preferable to use ultraviolet rays for light irradiation.
  • the irradiation energy is preferably 20mJ / cm 2 ⁇ 50J / cm 2, 100mJ / cm 2 ⁇ 1,500mJ / cm 2 is more preferable.
  • light irradiation may be performed under heating conditions or in a nitrogen atmosphere.
  • the irradiation ultraviolet wavelength is preferably 350 nm to 430 nm.
  • the polymerization reaction rate is preferably as high as possible from the viewpoint of stability, preferably 70% or more, and more preferably 80% or more.
  • the polymerization reaction rate can be determined by measuring the consumption ratio of the polymerizable functional group using an IR absorption spectrum.
  • the half mirror film or the circularly polarized light reflection layer may include other layers such as a support and an alignment layer. All other layers are preferably transparent in the visible light region. In this specification, being transparent in the visible light region means that the transmittance of visible light is 70% or more. Moreover, it is preferable that all other layers have low birefringence. In the present specification, low birefringence means that the front phase difference is 10 nm or less in the wavelength region where the projected image display portion of the windshield glass of the present invention shows reflection, and the front phase difference is It is preferable that it is 5 nm or less. Further, it is preferable that the other layers have a small difference in refractive index from the average refractive index (in-plane average refractive index) of the cholesteric liquid crystal layer.
  • the support can be a substrate when forming a cholesteric liquid crystal layer or a retardation layer described later.
  • the support is not particularly limited.
  • the support used for forming the cholesteric liquid crystal layer or retardation layer is a temporary support that is peeled off after the formation of the cholesteric liquid crystal layer, and may not be included in the finished half mirror film or windshield glass. Good.
  • Examples of the support include plastic films such as polyester such as polyethylene terephthalate (PET), polycarbonate, acrylic resin, epoxy resin, polyurethane, polyamide, polyolefin, cellulose derivative, and silicone.
  • glass may be used as the temporary support.
  • the thickness of the support may be about 5.0 ⁇ m to 1000 ⁇ m, preferably 10 ⁇ m to 250 ⁇ m, and more preferably 15 ⁇ m to 100 ⁇ m.
  • the half mirror film may include an alignment layer as a lower layer to which the liquid crystal composition is applied when forming the cholesteric liquid crystal layer or the retardation layer.
  • the alignment layer has a rubbing treatment of organic compounds such as polymers (resins such as polyimide, polyvinyl alcohol, polyester, polyarylate, polyamideimide, polyetherimide, polyamide, modified polyamide), oblique deposition of inorganic compounds, and microgrooves. It can be provided by means such as formation of a layer or accumulation of an organic compound (for example, ⁇ -tricosanoic acid, dioctadecylmethylammonium chloride, methyl stearylate) using the Langmuir-Blodgett method (LB film).
  • LB film Langmuir-Blodgett method
  • an alignment layer that generates an alignment function by application of an electric field, application of a magnetic field, or light irradiation may be used.
  • the alignment layer made of a polymer is preferably subjected to a rubbing treatment and then a liquid crystal composition is applied to the rubbing treatment surface.
  • the rubbing treatment can be performed by rubbing the surface of the polymer layer with paper or cloth in a certain direction. You may apply
  • the alignment layer may not be peeled off together with the temporary support to form a half mirror film.
  • the thickness of the alignment layer is preferably 0.01 ⁇ m to 5.0 ⁇ m, and more preferably 0.05 ⁇ m to 2.0 ⁇ m.
  • the windshield glass of the present invention includes a substrate.
  • the base material is adjacent to the half mirror film in the windshield glass including the first glass plate, the first resin film, the half mirror film, the second resin film, and the second glass plate in this order.
  • Adjacent to the half mirror film means that the first glass plate, the first resin film, the substrate, the half mirror film, the second resin film, and the second glass plate are in this order, or
  • the base material is included in the windshield glass so that the first glass plate, the first resin film, the half mirror film, the base material, the second resin film, and the second glass plate are in this order.
  • the half mirror film may be in direct contact with the base material or bonded to the base material via an adhesive layer.
  • the base material may be adjacent to the half mirror film on the entire main surface, or may be adjacent to the half mirror film on a part of the main surface.
  • the substrate may have substantially the same shape and area as the glass plate, or may have a smaller area than the glass plate.
  • the substrate has substantially the same shape and area as the glass plate, and the half mirror film may be adjacent to the substrate at a part of the main surface of the substrate.
  • the base material has an elastic modulus of 3 GPa to 10 GPa and a thickness of 150 ⁇ m to 500 ⁇ m.
  • the elastic modulus of the substrate is preferably 3.5 GPa to 9 GPa, more preferably 4 GPa to 8 GPa.
  • the thickness of the substrate is preferably 160 ⁇ m to 400 ⁇ m, and more preferably 170 ⁇ m to 300 ⁇ m.
  • the base material preferably has an elastic modulus of 5 GPa to 8 GPa and a thickness of 170 ⁇ m to 300 ⁇ m.
  • the elastic modulus is determined by pulling the sample at a speed of 10 mm / min using a tensile tester in accordance with the measurement method of JIS K7127, and obtaining the strength and elongation when the sample is cut, thereby deforming the sample. Measured from the maximum elasticity immediately before (primary expression of the tangent of the maximum slope of the SS curve).
  • the substrate examples include plastic films such as polyester such as polyethylene terephthalate (PET), polycarbonate, acrylic resin, epoxy resin, polyurethane, polyamide, polyolefin, cellulose derivative, and silicone.
  • PET polyethylene terephthalate
  • a polyethylene terephthalate film is preferable from the viewpoint of cost.
  • the polyethylene terephthalate film a film having a low haze, a high transmittance, and a film that is difficult to hydrolyze is preferable.
  • the thickness of the polyethylene terephthalate film is more preferably 170 ⁇ m to 300 ⁇ m.
  • a retardation layer (a first retardation layer or a second retardation layer) described later may also serve as a base material.
  • the base material and the half mirror film are integrated before the process of manufacturing the laminated glass described later and are a laminated film including the base material and the half mirror film.
  • the orange peel-like unevenness in the half mirror film in the windshield glass is obtained by integrating the base material having the elastic modulus and thickness and the half mirror film before the process including the heating and pressurizing processes. Can be prevented.
  • the aspects of the base material and the half mirror film in the laminated film are the same as those described in the above-described windshield glass.
  • Integrating may be performed by directly forming a half mirror film on the substrate, or may be performed by bonding both, but it is preferable to bond both. Bonding may be performed by an adhesive layer described later.
  • the thickness of the adhesive layer is preferably 10 ⁇ m or less. This is because, by setting the thickness of the adhesive layer to 10 ⁇ m or less, orange-peel-shaped unevenness derived from the adhesive layer is unlikely to occur.
  • an ultraviolet curing type as an adhesive for adhering the base material and the half mirror film.
  • an ultraviolet curable adhesive has a sufficient adhesive strength with a thickness of 10 ⁇ m or less, and therefore, an ultraviolet curable adhesive is used to provide an adhesive layer of 10 ⁇ m or less, preferably 5 ⁇ m or less, more preferably 3 ⁇ m or less. be able to.
  • OCA tape highly transparent adhesive transfer tape
  • a commercially available product generally has a thickness exceeding 10 ⁇ m, and therefore, a tape having a thickness of 10 ⁇ m or less may be selected and used.
  • the support may be peeled off simultaneously with the adhesion to the substrate, immediately after, or immediately before.
  • the half mirror film is preferably bonded to a part of the main surface of the base material via an adhesive layer.
  • the area may be 90% or less, 50% or less, 40% or less, 30% or less, 20% or less, 10% or less, 5% or less, etc. with respect to the total area of the substrate. It may be 1% or more, 3% or more, 5% or more, 7% or more, 10% or more.
  • the base material has substantially the same shape and area as the windshield glass to be manufactured.
  • the windshield glass of the present invention may include a retardation layer between the circularly polarized light reflecting layer and the second resin film.
  • a clear projected image can be displayed by using a retardation layer in which the front retardation is appropriately adjusted in combination with the circularly polarized light reflecting layer.
  • the retardation layer may be included as a layer constituting the half mirror film, or may be included as a base material.
  • retardation layers particularly preferred examples of retardation layers contained in windshield glass as a substrate include stretched polycarbonate films, stretched norbornene polymer films, and inorganic having birefringence such as strontium carbonate.
  • examples thereof include a transparent film containing particles and oriented, a thin film obtained by obliquely depositing an inorganic dielectric on a support, and a film obtained by orienting and fixing a liquid crystal compound uniaxially.
  • a preferable example of the retardation layer included as a layer constituting the half mirror film is a film in which a polymerizable liquid crystal compound is uniaxially aligned and fixed.
  • a liquid crystal composition containing a polymerizable liquid crystal compound is applied to the surface of the support or the alignment layer, and the polymerizable liquid crystal compound in the liquid crystal composition is formed in a nematic alignment in a liquid crystal state and then fixed by curing. Can be formed.
  • the retardation layer can be formed in the same manner as the formation of the cholesteric liquid crystal layer except that no chiral agent is added to the liquid crystal composition.
  • the heating temperature is preferably 50 ° C. to 120 ° C. and more preferably 60 ° C. to 100 ° C. in the nematic alignment after the application of the liquid crystal composition.
  • a retardation layer is formed by applying a composition containing a polymer liquid crystal compound on the surface of a support or an alignment layer to form a nematic alignment in a liquid crystal state. Further, it may be a layer obtained by fixing the orientation by cooling.
  • the thickness of the retardation layer included as a layer constituting the half mirror film is not particularly limited, but is preferably 0.2 ⁇ m to 10 ⁇ m, more preferably 0.5 ⁇ m to 5.0 ⁇ m, and 1.0 ⁇ m to 2. 0 ⁇ m is more preferable.
  • the retardation layer is particularly preferably a ⁇ / 2 retardation layer.
  • the projected image display part produced by combining the ⁇ / 2 retardation layer and the circularly polarized reflective layer is compared with, for example, the projected image display part using a combination of the ⁇ / 4 retardation layer and the circularly polarized reflective layer.
  • the front phase difference of the ⁇ / 2 retardation layer may be a length that is 1 ⁇ 2 of the visible light wavelength region, or “center wavelength ⁇ n ⁇ 1 ⁇ 2 of the center wavelength (n is an integer)”.
  • the reflection wavelength of the circularly polarized light reflection layer for example, any cholesteric liquid crystal
  • the length of 1 ⁇ 2 of the center wavelength of the light emission wavelength of the light source may be used.
  • the phase difference may be in the range of 190 nm to 390 nm, and the phase difference is preferably in the range of 200 nm to 350 nm.
  • the slow axis direction of the ⁇ / 2 retardation layer can be determined according to the incident direction of incident light for projected image display and the spiral sense of the cholesteric liquid crystal layer when used as a head-up display system.
  • the incident light is in the lower (vertically lower) direction of the projected image display portion and may be referred to as “ ⁇ / 2 phase difference layer side” (in this specification, “from the observer side”) with respect to the circularly polarized light reflection layer )
  • the slow axis of the ⁇ / 2 retardation layer is in the range of + 40 ° to + 65 ° or ⁇ 40 ° to ⁇ 65 ° with respect to the vertical upward direction of the projected image display portion.
  • the slow axis direction is preferably set as follows according to the spiral sense of the cholesteric liquid crystal layer in the circularly polarized light reflecting layer.
  • the sense is on the right (preferably, when the senses of all cholesteric liquid crystal layers are on the right)
  • the slow axis of the ⁇ / 2 retardation layer is viewed from the observer side with respect to the vertical upward direction of the projected image display region.
  • it is preferably in the range of 40 ° to 65 °, preferably 45 ° to 60 °.
  • the slow axis of the ⁇ / 2 retardation layer is viewed from the observer side with respect to the vertical upward direction of the projected image display area.
  • it is preferably in the range of 40 ° to 65 °, preferably 45 ° to 60 ° counterclockwise.
  • the windshield glass of the present invention may include a second retardation layer in addition to the retardation layer.
  • the retardation layer included between the circularly polarized light reflection layer and the second resin film may be referred to as a first retardation layer.
  • the second retardation layer may be provided so that the first retardation layer (preferably ⁇ / 2 retardation layer), the circularly polarized light reflection layer, and the second retardation layer are in this order.
  • the first retardation layer, the circularly polarized light reflection layer, and the second retardation layer may be provided in this order from the viewer side.
  • the second retardation layer may be included as a part of the half mirror film or may be included as a base material.
  • double images can be further prevented.
  • the effect is more remarkable when a low ⁇ n polymerizable liquid crystal compound is used for forming a cholesteric liquid crystal layer in the circularly polarized light reflection layer.
  • the reason that the double image can be further prevented by using the second retardation layer is that light having a wavelength not in the selective reflection band of the cholesteric liquid crystal layer included in the circularly polarized light reflection layer is polarized and converted by the cholesteric liquid crystal layer. It is presumed that the double image generated based on the reflection on the back surface of the windshield glass can be prevented.
  • the retardation of the second retardation layer may be appropriately adjusted in the range of 160 nm to 460 nm, preferably in the range of 240 nm to 420 nm at the wavelength of 550 nm.
  • the material, thickness, and the like of the second retardation layer can be selected in the same range as the first retardation layer.
  • the slow axis direction of the second retardation layer is determined according to the incident direction of incident light for projecting image display and the spiral sense of the cholesteric liquid crystal layer.
  • the second phase difference layer having a phase difference in the range of 160 nm to 400 nm at a wavelength of 550 nm is + 10 ° to + 35 ° or ⁇ 10 ° to ⁇ 35 ° with respect to the vertical direction of the projected image display portion. It is preferable to be in the range.
  • the slow axis of the second retardation layer having a phase difference in the range of 200 nm to 400 nm at the wavelength of 550 nm is + 100 ° to + 140 ° or ⁇ 100 ° to ⁇ 140 ° with respect to the vertical upward direction of the projected image display portion. It is preferable to be in the range.
  • the adhesive layer is not only between the base material and the half mirror film as described above, but also, for example, between the cholesteric liquid crystal layer, between the circularly polarized reflective layer and the first retardation layer, and between the circularly polarized reflective layer and the second retardation. It may be provided between layers. Further, it may be provided between the half mirror film and the resin film, between the base material and the resin film, or the like.
  • the adhesive layer is preferably transparent in the visible light region.
  • the adhesive layer preferably has low birefringence, and preferably has a small difference in refractive index from the average refractive index (in-plane average refractive index) of the cholesteric liquid crystal layer.
  • Adhesives include hot melt type, thermosetting type, photocuring type, reactive curing type, and pressure-sensitive adhesive type that does not require curing, from the viewpoint of curing method, and the materials are acrylate, urethane, urethane acrylate, epoxy , Epoxy acrylate, polyolefin, modified olefin, polypropylene, ethylene vinyl alcohol, vinyl chloride, chloroprene rubber, cyanoacrylate, polyamide, polyimide, polystyrene, polyvinyl butyral, etc. can do.
  • the photo-curing type particularly the ultraviolet curing type
  • the material is acrylate, urethane acrylate, epoxy acrylate, etc. It is preferable to do.
  • the thickness of the adhesive layer in the above example is preferably 0.5 ⁇ m to 10 ⁇ m, and more preferably 1.0 ⁇ m to 5.0 ⁇ m. In order to reduce color unevenness and the like of the projected image display part, it is preferable to provide the uniform thickness.
  • the adhesive layer may be formed using a highly transparent adhesive transfer tape (OCA tape).
  • OCA tape a highly transparent adhesive transfer tape
  • a commercially available product for an image display device particularly a commercially available product for the surface of the image display unit of the image display device can be used.
  • Examples of commercially available products include PANAC Corporation pressure-sensitive adhesive sheets (PD-S1 and the like), MHI Series MHM series pressure-sensitive adhesive sheets, and the like.
  • the thickness of the OCA tape may be 1.0 ⁇ m to 50 ⁇ m, and preferably 2.0 ⁇ m to 30 ⁇ m. As described above, when used as an adhesive layer between the substrate and the half mirror film, the thickness of the OCA tape is preferably 10 ⁇ m or less.
  • the windshield glass can be manufactured using a known laminated glass manufacturing method. For example, in a laminate obtained by sandwiching two resin films in a state where a laminate film (hereinafter sometimes referred to as a laminate film) including a base material and a half mirror film is sandwiched between two glass plates On the other hand, it can be manufactured by performing pre-bonding and main-bonding. Alternatively, an intermediate film sheet having a structure in which a laminated film is sandwiched between two resin films is prepared in advance, and pre-compression and main pressure bonding are performed on a laminate obtained by sandwiching the intermediate film between two glass plates. It can be manufactured by doing.
  • a laminate film including a base material and a half mirror film
  • the heating and pressurization at the time of forming the intermediate film having a structure in which the above laminated film is sandwiched between two resin films are, for example, a temperature of 40 ° C. or higher and 140 ° C. or lower, preferably a temperature of 60 ° C. or higher and 120 ° C. or lower, a pressure of 0.05 MPa It may be performed at 0.8 MPa or less and preferably at 0.1 MPa or more and 0.5 MPa or less.
  • Pre-crimping is a process performed for deaeration between layers in the production of laminated glass.
  • the pre-compression is performed, for example, by putting the laminated body in a rubber bag connected to an exhaust system.
  • the pressure at this time is preferably 100 kPa or less, more preferably 1 to 36 kPa.
  • the pre-bonding can be performed by holding at a temperature of 70 ° C. to 130 ° C. for 10 minutes to 90 minutes.
  • Preliminary pressure bonding can be achieved by setting the holding temperature to 70 ° C. or higher.
  • the holding temperature is preferably 80 ° C. or higher, and more preferably 90 ° C. or higher. This is for performing deaeration more reliably.
  • the holding temperature is preferably 120 ° C. or lower, and more preferably 110 ° C. or lower.
  • the holding time is 10 minutes or more, the preliminary pressure bonding can be sufficiently performed.
  • the holding time is 90 minutes or less, the productivity is good and the thermal shrinkage of the half mirror film or the base material can be prevented from proceeding excessively, thereby suppressing the occurrence of cracks in the half mirror film or the base material. be able to.
  • the holding time is preferably 20 minutes or longer and 60 minutes or shorter from the viewpoint of more effectively and efficiently performing preliminary pressure bonding.
  • the main pressure bonding is performed in order to sufficiently bond the respective layers with the resin film.
  • a pre-pressure bonded body obtained by the pre-pressure bonding is put in an autoclave, the temperature is 110 ° C. or higher and 150 ° C. or lower, and the pressure is 0.98 MPa. This can be performed at a pressure of 1.47 MPa or less. More preferably, the temperature is 130 ° C. to 140 ° C. and the pressure is 1.1 MPa to 1.4 MPa. And it is preferable that it is 15 minutes or more and 90 minutes or less, and, as for the time (holding time) hold
  • ⁇ Layer on the viewing side with respect to the circularly polarized reflective layer> In general, in a projection image display member, based on an image based on reflected light from a layer that reflects projection light, and reflection light from a front surface or a back side as viewed from the light incident side of the projection image display member. Double images (or multiple images) are caused by overlapping images.
  • the light transmitted through the cholesteric liquid crystal layer in the circularly polarized light reflection layer is circularly polarized light having a sense opposite to that of the circularly polarized light reflected by the cholesteric liquid crystal layer, and reflected light from the back side surface.
  • the circularly polarized light that is usually reflected by the cholesteric liquid crystal layer is mostly, so that it is difficult to produce a noticeable double image.
  • the projection light most of the projection light can be reflected by the circularly polarized light reflection layer.
  • the reflected light from the front surface can cause a noticeable double image.
  • the distance from the center of gravity of the cholesteric liquid crystal layer to the front surface when viewed from the light incident side of the windshield glass is a certain value or more, a double image can be prominent.
  • the total thickness of the layers on the second glass plate side from the circularly polarized reflective layer that is, the outermost surface on the second glass plate side of the circularly polarized reflective layer From the circularly polarizing reflective layer, the distance to the outermost surface of the windshield glass on the second glass plate side is 0.5 mm or more, a double image can be prominent, and 1 mm or more can be more prominent, It may become more prominent at 1.5 mm or more, and may be particularly noticeable at 2.0 mm or more.
  • the layer on the viewer side from the circularly polarized light reflecting layer include a first retardation layer, a second resin film, and a second glass plate.
  • the windshield glass of the present invention has a remarkable double effect even when the total thickness of the layers closer to the viewing side than the circularly polarized reflective layer is as described above in the projected image display using p-polarized light as described later.
  • the projected image can be viewed without an image.
  • the windshield glass of the present invention can be used as a component of a head-up display system.
  • the head-up display system includes a projector.
  • the substrate, the half mirror film, and the projector are preferably arranged in this order.
  • the windshield glass includes a retardation layer
  • the head-up display system preferably includes a circularly polarized light reflection layer, a retardation layer, and a projector arranged in this order.
  • the “projector” is “an apparatus that projects light or an image”, and includes an “apparatus that projects a drawn image”.
  • the projector only needs to be arranged so as to be incident on the projected image display portion in the windshield glass at the oblique incident angle as described above.
  • the projector preferably includes a drawing device and reflects and displays an image (real image) drawn on a small intermediate image screen as a virtual image by a combiner.
  • the drawing device itself may be a device that displays an image, or may be a device that emits light capable of drawing an image.
  • the light from the light source may be adjusted by a drawing method such as an optical modulator, laser luminance modulation means, or light deflection means for drawing.
  • the drawing device means a device that includes a light source and further includes a light modulator, a laser luminance modulation unit, a light deflection unit for drawing, or the like according to a drawing method.
  • the light source is not particularly limited, and LEDs (including light emitting diodes and organic light emitting diodes (OLED)), discharge tubes, laser light sources, and the like can be used. Of these, LEDs and discharge tubes are preferred. This is because it is suitable for a light source of a drawing device that emits linearly polarized light. Of these, LEDs are particularly preferred. This is because LEDs are suitable for combination with a combiner using a cholesteric liquid crystal layer exhibiting selective reflection in a specific wavelength region, as will be described later, because the emission wavelength is not continuous in the visible light region.
  • LEDs including light emitting diodes and organic light emitting diodes (OLED)
  • LEDs and discharge tubes are preferred. This is because it is suitable for a light source of a drawing device that emits linearly polarized light. Of these, LEDs are particularly preferred. This is because LEDs are suitable for combination with a combiner using a cholesteric liquid crystal layer exhibiting selective reflection in a specific wavelength region, as will be described later
  • the drawing method can be selected according to the light source to be used and the application, and is not particularly limited.
  • Examples of the drawing method include a fluorescent display tube, a liquid crystal display (LCD) method using liquid crystal and a liquid crystal on silicon (LCOS) method, a DLP (digital light processing) method, and a scanning method using a laser.
  • Etc. The drawing method may be a method using a fluorescent display tube integrated with a light source.
  • the DLP system is a display system using DMD (Digital Micromirror Device), and is drawn by arranging micromirrors for the number of pixels, and light is emitted from a projection lens.
  • the scanning method is a method in which a light beam is scanned on a screen and an image is contrasted using an afterimage of an eye. For example, the descriptions in JP-A-7-270711 and JP-A-2013-228664 can be referred to.
  • laser light of each color for example, red light, green light, and blue light
  • the luminance modulation of laser light of each color may be performed directly as a change in intensity of the light source, or may be performed by an external modulator.
  • the light deflection means include a galvanometer mirror, a combination of a galvanometer mirror and a polygon mirror, or MEMS (microelectromechanical system).
  • MEMS is preferable.
  • the scanning method include a random scan method and a raster scan method, but it is preferable to use a raster scan method.
  • the laser beam can be driven by a resonance frequency in the horizontal direction and a sawtooth wave in the vertical direction, for example. Since the scanning system does not require a projection lens, the apparatus can be easily downsized.
  • the light emitted from the drawing device may be linearly polarized light or natural light (non-polarized light).
  • the light emitted from the drawing device included in the head-up display system of the present invention is preferably linearly polarized light.
  • the emitted light is essentially linearly polarized light.
  • the output light is a linearly polarized light drawing device and the output light contains light of a plurality of wavelengths (colors)
  • the polarization directions (transmission axis directions) of the plurality of light polarizations are the same or orthogonal to each other It is preferable.
  • the drawing device may use an intermediate image screen.
  • an “intermediate image screen” is a screen on which an image is drawn. That is, when the light emitted from the drawing device is not yet visible as an image, the drawing device forms a visible image on the intermediate image screen by this light.
  • the image drawn on the intermediate image screen may be projected onto the combiner by light transmitted through the intermediate image screen, or may be projected onto the combiner after reflecting off the intermediate image screen.
  • the intermediate image screen examples include a scattering film, a microlens array, and a screen for rear projection.
  • a plastic material is used as the intermediate image screen, if the intermediate image screen has birefringence, the polarization plane and light intensity of polarized light incident on the intermediate image screen are disturbed, and color unevenness is likely to occur in the combiner.
  • the use of a retardation film having a predetermined phase difference can reduce the problem of color unevenness.
  • the intermediate image screen preferably has a function of spreading and transmitting incident light. This is because such a function makes it possible to display an enlarged projected image.
  • a screen composed of a microlens array can be cited.
  • the microarray lens used in the head-up display is described in, for example, Japanese Patent Application Laid-Open No. 2012-226303, Japanese Patent Application Laid-Open No. 2010-145745, and Japanese Patent Application Publication No. 2007-523369.
  • the projector may include a reflecting mirror that adjusts the optical path of the projection light formed by the drawing device.
  • JP-A-2-141720, JP-A-10-96874, JP-A-2003-98470, US Pat. No. 5,013,134 are disclosed. Reference can be made to JP-T-2006-512622.
  • the windshield glass of the present invention is particularly useful for a head-up display system using a laser, LED, OLED or the like whose emission wavelength is not continuous in the visible light region in combination with a projector using a light source. This is because the central wavelength of selective reflection of the cholesteric liquid crystal layer can be adjusted according to each emission wavelength. Moreover, it can also be used for the projection of a display in which display light such as an LCD (Liquid Crystal Display) is polarized.
  • LCD Liquid Crystal Display
  • Incident light is preferably incident at an oblique incident angle of 45 ° to 70 ° with respect to the normal of the projected image display portion.
  • the projection light p-polarized light
  • the reflected light from the glass surface approaches zero. is there. (See, for example, JP-T-2006-512622).
  • the Brewster angle at the interface between glass having a refractive index of about 1.51 and air having a refractive index of about 1 is about 56 °, and p-polarized light is incident within the above-mentioned angle range, so that incident light for displaying a projected image is displayed.
  • the circularly polarized reflective layer has less reflected light from the surface of the ⁇ / 2 retardation layer, and can display an image with less influence of a double image.
  • the angle is preferably 50 ° to 65 °.
  • the projected image is observed on the incident light plane side at an angle of 45 ° to 70 °, preferably 50 ° to 65 ° on the side opposite to the incident light with respect to the normal line of the ⁇ / 2 retardation layer. Any configuration can be used.
  • the incident light is incident on the circularly polarizing reflection layer from the first retardation layer side, and passes through the first retardation layer and then the circularly polarizing reflecting layer. It is sufficient to make it incident. That is, the first retardation layer may be disposed on the incident side of the projection light with respect to the circularly polarized light reflection layer. Further, the incident light may be incident from any direction such as up / down / left / right of the windshield glass, and may be determined according to the direction of the observer. For example, the incident light may be incident at an oblique incident angle as described above from the downward direction during use.
  • the slow axis of the first retardation layer (for example, ⁇ / 2 retardation layer) in the windshield glass is 40 ° to 65 ° with respect to the vibration direction of the incident p-polarized light (incident light incident surface).
  • An angle is preferable, and an angle of 45 ° to 60 ° is more preferable.
  • the projection light in the projection image display on the head-up display is p-polarized light that vibrates in a direction parallel to the incident surface.
  • the output light of the projector is not linearly polarized light, it may be p-polarized by using a linearly polarizing film arranged on the output light side of the projector, and it is made p-polarized in the optical path from the projector to the windshield glass. Also good.
  • the polarization direction is adjusted in a wavelength-selective manner, and p-polarized light is used in all color wavelength ranges. It is preferable to make it enter.
  • ⁇ Preparation of ⁇ / 2 retardation layer> The surface of Toyobo Co., Ltd. Cosmo Shine A-4100 (PET, thickness 75 ⁇ m) that has not been subjected to an easy adhesion treatment is rubbed, and the coating film 1 shown in Table 1 has a dry film thickness of 1.8 ⁇ m after drying. It applied at room temperature using a wire bar.
  • MEK methyl ethyl ketone
  • the coating layer was dried at room temperature for 30 seconds, then heated at 85 ° C. for 2 minutes, and then at 60 ° C.
  • the coating liquid UV shown in Table 2 was applied at room temperature using a wire bar so that the dry film thickness after drying was 3 ⁇ m.
  • an 8: 2 mixed liquid of methyl acetate and cyclohexanone is used as the solvent, and the solid content concentration becomes 25% by mass.
  • the amount of solvent was adjusted.
  • the coating layer was dried at room temperature for 30 seconds, then heated at 85 ° C. for 2 minutes, and then at 60 ° C. with a fusion D bulb (90 mW / cm lamp) at an output of 60% for 6 to 12 seconds with UV irradiation. Then, a liquid crystal layer was prepared to obtain a reflective layer UV with a PET base.
  • An OCA tape (MHM-UVC15 manufactured by Niei Kaiko Co., Ltd.) was bonded to an acrylic plate (thickness 0.2 mm, 40 mm square).
  • the release film of the OCA tape was peeled off, and a ⁇ / 2 retardation layer with a PET base was bonded onto the OCA tape on the surface on the ⁇ / 2 retardation layer side.
  • the PET was peeled off to produce a ⁇ / 2 retardation layer with an acrylic plate.
  • the retardation of the ⁇ / 2 retardation layer with an acrylic plate was measured using an AxoScan manufactured by Axometrics, and was used as the retardation of the ⁇ / 2 retardation layer. The results are shown in Table 3.
  • ⁇ Preparation of half mirror film HM-1> The reflection layer UV, the reflection layer B, the reflection layer G, and the reflection layer R layer are laminated in the order shown in Table 4 on the surface of the ⁇ / 2 retardation layer side of the ⁇ / 2 retardation layer with a PET base prepared in the same manner as described above.
  • the half mirror film HM-1 was produced.
  • Each layer is formed by applying a coating solution for forming each layer on the ⁇ / 2 retardation layer or the reflective layer in the same manner as described above so that the thickness of the layer after drying becomes the thickness shown in Table 3. In the same manner as described above, drying and UV irradiation were performed.
  • Example 1 For Cosmo Shine A-4300 (PET, thickness 250 ⁇ m) manufactured by Toyobo Co., Ltd., the elastic modulus was measured according to the measurement method of JIS K 7127. A sample piece was cut out with a length of 10 mm in the longitudinal direction (MD) and a length of 150 mm in the width direction (TD) perpendicular to the MD, and a strograph R2 manufactured by Toyo Seiki Seisakusho was used for the sample piece. A tensile test was conducted. The tensile test was performed in the width direction of the sample piece with a distance between chucks of 100 mm and a tensile speed of 10 mm / min. As a result of the measurement, the elastic modulus was 4 GPa.
  • An adhesive layer (UVX-5457 manufactured by Toagosei Co., Ltd.) was applied to the PET film at room temperature using a wire bar so as to have a thickness of 5 ⁇ m.
  • the half mirror film produced above was bonded using a roller so that the reflective layer was on the PET film side.
  • the PET that was the support for the retardation layer was peeled off.
  • the slow axis direction of the retardation layer of the half mirror film HM-1 was referenced to the short side direction of the glass as viewed from the peeling surface. Were arranged so as to be in the direction of 60 ° in the clockwise direction. Thereafter, UV irradiation was performed at 60 ° C.
  • this laminated film was cut into a length of 40 cm and a width of 25 cm.
  • the wind peel glass orange peel was evaluated indoors.
  • the windshield glass was placed on a desk so that the base material of the laminated film was below the half mirror film, and the reflected image was visually evaluated by projecting a fluorescent lamp on the half mirror part.
  • the evaluation criteria were as follows. A: There is no distortion in the reflected image of the fluorescent lamp. B: There is almost no distortion in the reflected image of the fluorescent lamp. When the viewpoint is shifted to the side, the reflected image fluctuates slightly. (Acceptable level) C: The reflected image of the fluorescent lamp is blurred due to the fine wrinkles of the half mirror. (Acceptable level) D: The reflected image of the fluorescent lamp appears distorted due to the large wrinkles of the half mirror.
  • Windshield glass 2 Glass plate 3 PVB film (resin film) 4 Half mirror film 5 Base material 6 Adhesive layer 7 Circularly polarized reflective layer 11 Reflective layer UV (cholesteric liquid crystal layer) 12 Reflective layer B (cholesteric liquid crystal layer) 13 Reflective layer G (Cholesteric liquid crystal layer) 14 Reflective layer R (cholesteric liquid crystal layer) 15 ⁇ / 2 retardation layer (retardation layer) 21 Laminated film

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Abstract

La vitre de pare-brise d'après la présente invention comprend, dans l'ordre, une première plaque de verre, un premier film de résine, un film de demi-miroir, un second film de résine et une seconde plaque de verre. Ladite vitre comprend en outre un substrat. Le film de demi-miroir contient une couche circulaire de réflexion de lumière polarisée. La couche circulaire de réflexion de lumière polarisée contient une couche de cristaux liquides cholestériques. Le film de demi-miroir est adjacent au substrat. Le substrat a un module d'élasticité de 3 à 10 GPa et une épaisseur de 150 à 500 µm. La vitre de pare-brise présente une déformation réduite qui peut être observée visuellement dans une partie du film de demi-miroir. La vitre de pare-brise peut être utilisée dans un système d'affichage tête haute.
PCT/JP2017/037322 2016-12-13 2017-10-16 Vitre de pare-brise, système d'affichage tête haute et film stratifié WO2018110066A1 (fr)

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WO2020122023A1 (fr) * 2018-12-10 2020-06-18 富士フイルム株式会社 Élément d'affichage d'image de projection, vitre de pare-brise et système d'affichage tête haute
WO2020179787A1 (fr) * 2019-03-06 2020-09-10 富士フイルム株式会社 Film stratifié pour afficher une image de projection, verre feuilleté pour afficher une image de projection et système d'affichage d'image

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JP7247068B2 (ja) * 2019-09-27 2023-03-28 富士フイルム株式会社 プロジェクター用反射部材およびヘッドアップディスプレイ用プロジェクター

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JPWO2020080355A1 (ja) * 2018-10-17 2021-10-14 富士フイルム株式会社 投映像表示用部材、ウインドシールドガラスおよびヘッドアップディスプレイシステム
US11892627B2 (en) 2018-10-17 2024-02-06 Fujifilm Corporation Projection image display member, windshield glass, and head-up display system
JP7177176B2 (ja) 2018-10-17 2022-11-22 富士フイルム株式会社 投映像表示用部材、ウインドシールドガラスおよびヘッドアップディスプレイシステム
WO2020080355A1 (fr) * 2018-10-17 2020-04-23 富士フイルム株式会社 Élément d'affichage d'image à projection, vitre de pare-brise, et système d'affichage tête haute
JPWO2020122023A1 (ja) * 2018-12-10 2021-11-11 富士フイルム株式会社 投映像表示用部材、ウインドシールドガラスおよびヘッドアップディスプレイシステム
JP7299920B2 (ja) 2018-12-10 2023-06-28 富士フイルム株式会社 投映像表示用部材、ウインドシールドガラスおよびヘッドアップディスプレイシステム
WO2020122023A1 (fr) * 2018-12-10 2020-06-18 富士フイルム株式会社 Élément d'affichage d'image de projection, vitre de pare-brise et système d'affichage tête haute
US11947109B2 (en) 2018-12-10 2024-04-02 Fujifilm Corporation Projection image-displaying member, windshield glass, and head-up display system
CN113498487A (zh) * 2019-03-06 2021-10-12 富士胶片株式会社 投影图像显示用层叠膜、投影图像显示用的夹层玻璃及图像显示系统
JPWO2020179787A1 (fr) * 2019-03-06 2020-09-10
EP3936924A4 (fr) * 2019-03-06 2022-05-04 FUJIFILM Corporation Film stratifié pour afficher une image de projection, verre feuilleté pour afficher une image de projection et système d'affichage d'image
JP7133703B2 (ja) 2019-03-06 2022-09-08 富士フイルム株式会社 投映像表示用積層フィルム、投映像表示用の合わせガラス、および、画像表示システム
WO2020179787A1 (fr) * 2019-03-06 2020-09-10 富士フイルム株式会社 Film stratifié pour afficher une image de projection, verre feuilleté pour afficher une image de projection et système d'affichage d'image

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