JP2013054350A - Head-up display and mobile apparatus using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a head-up display having a display part scarcely causing poor appearance, allowing post-molding, and improving visibility of external information such as landscape and information, on the display part.SOLUTION: The head-up display includes a projector 10 for projecting information, and the display part on which the information is projected to be visible. The display part comprises a transparent base material 11, an adhesive layer 12, and a half mirror material 13 that is formed by alternately superposing 50 layers or more of layers (A layers) consisting of thermosetting resin A and layers (B layers) consisting of thermosetting resin B. The reflectance ratio of the half mirror material is not less than 13% and not more than 70%, and defect luminance distribution irregularity of the display part is 40% or less.

Description

  The present invention relates to a head-up display using a half mirror material for an image display unit.

  A head-up display is known as a means for directly displaying information in the human visual field. For example, while driving an automobile, information such as the speed of instruments is directly displayed on the windshield as a virtual image in the vehicle, so that the vehicle can be driven without changing the field of view, thereby preventing accidents. Usually, light emitted from a projector such as a small liquid crystal projector is transmitted and reflected by a display unit made of a transparent base material including a half mirror material. The observer acquires information displayed on the display unit, and simultaneously acquires external information such as an outside landscape through the display unit.

As a conventional half mirror material, it is known that a metal half-evaporation with high reflectivity or a metal oxide multilayer film such as SiO ₂ or TiO ₂ is used on a glass or a transparent resin base material used as a display unit. ing. These are produced by vapor deposition methods such as sputtering and wet methods such as printing and baking, and are stacked and stacked one by one. Therefore, vapor deposition unevenness and printing unevenness, which are process problems, are likely to occur frequently, resulting in poor appearance. There were many cases, and high cost was a problem. In addition, these films are difficult to be integrally formed with a transparent base material due to cracks and cracks, and therefore the manufacturing method is limited when the base material has a curved shape. Furthermore, to improve the visibility of information due to the presence of absorption bands in the ultraviolet / visible light region, if the reflectance is increased, the field of view of external information due to transmitted light, such as landscapes, becomes transparent due to coloring, etc. There was a problem that worsened with the decrease of. (Patent Documents 1 to 3)
In recent years, a half mirror material in which different thermoplastic resins are alternately laminated has appeared, and a reflection film, a brightness enhancement film for a liquid crystal display device (Patent Document 4), and a decoration / molding film for automobiles and home appliances (Patent Document 5). It has been proposed as a polarizing reflection film for use in head-up displays (Patent Document 6). However, these half mirror materials are prone to problems such as poor moldability and delamination, and when they are bonded to a transparent substrate simply through an adhesive, the undulations of the resin in the adhesive are undulated. A plurality of defects called cocoon skin (or orange peel) occurred at the interface between the film and the adhesive, and further, there was a problem of poor appearance due to coloring due to polarization performance. Further, due to the insulating properties of the film, there is a problem that static electricity is easily charged, and foreign matters are mixed in the bonding process, resulting in poor appearance.

JP-A-7-257226 (2nd page) Japanese Patent No. 3223845 (second term) JP 2010-230771 A (second page) Japanese translation of PCT publication No. 9-506837 (2nd page) International Publication WO2007 / 020861 (2nd page) JP-T-2006-51622 gazette (2nd term)

  The object of the present invention is that the appearance of the display part is less than that of a conventional head-up display, post-processing molding is possible, and external information such as scenery on the display part and the visibility of information are visible. Provide an improved head-up display.

  In order to solve the problem, the present invention has the following configuration. That is, a head-up display including a projector that projects information and a display unit on which information is projected, the display unit including a layer (A layer) made of a transparent base material, an adhesive layer, and a thermoplastic resin A, and heat It consists of a half mirror material in which 50 or more layers (layer B) made of plastic resin B are alternately laminated, and the reflectance of the half mirror material is 13% or more and 70% or less. The head-up display is characterized in that the distribution unevenness is 40% or less.

  The present invention has fewer appearance defects of the display unit than the conventional head-up display, enables post-processing molding, and improves the visibility of external information and information on the display unit.

Schematic diagram of an automotive head-up display (A) is a cross-sectional view of the display unit of the head-up display, (b) is a defect luminance distribution unevenness image, (c) is a luminance distribution diagram on broken line (26) in (b). Cross section of the display part of the head-up display Schematic diagram of the movable display part of the head-up display Diagram for explaining performance evaluation test of head-up display

  The present invention will be described below. FIG. 1 shows an example when the head-up display according to the present invention is applied to an automobile.

  Information from the projector includes information such as characters, symbols, numbers, figures, photographs, and images. In automotive applications, this refers to the display information and navigation information of instruments installed in the instrument panel of conventional vehicles, such as vehicle speed, engine speed, and car navigation images. Examples of the projector 10 include a liquid crystal panel on which information is displayed, or a projector that projects information. A typical LCD panel consists of a backlight unit, a liquid crystal unit, and a front plate unit. The liquid crystal display system is STN (Super Twisted Nematic) or TFT (Thin Film Transistor). Furthermore, there are a DSTN (Dual Super Twisted Nematic), FSTN (Film-compensated STN) system and the like. The projector is a device that enlarges and projects image information on a screen (display unit). Specifically, light from a conventionally known CRT projector and a light source passes through a liquid crystal panel, and the liquid crystal A liquid crystal projector that enlarges and projects an image on a panel onto a screen using a lens, a reflective LCOS (Liquid Crystal On Silicon) projector, a transmissive HTPS (High Temperature Poly-Silicon) projector, and a system using MEMS. It is a different DLP (Digital Light Processing) projector and a GLV (Grating Light Valve) projector. These light sources are equipped with mercury, metal halide, halogen, fluorescent lamp, white LED lamp, RGB three-wavelength LED lamp, and the like, and an LED lamp that is excellent in terms of low power consumption is preferable. A laser projector is more preferable from the viewpoint of convenience such that it is not necessary to focus when enlarging projection.

  In the head-up display of the present invention, information extracted as light from the information projector 10 in FIG. 1 is projected onto a display unit configured in the order of the transparent base material 11, the adhesive layer 12, and the half mirror material 13. Then, the observer acquires information displayed on the half mirror material 13, and simultaneously acquires external information through the display unit made of the half mirror material.

  The display unit is configured in the order of a transparent base material, an adhesive layer, and a half mirror material. Since the transparent substrate is required to be transparent, it is necessary to use glass or a transparent plastic substrate. The plastic substrate here includes a sheet and a film. The thickness is preferably 5 to 0.2 mm in terms of strength. Examples of plastics with good transparency include thermoplastic polyolefins such as ZEONOR manufactured by ZEON Corporation and Arton manufactured by JSR Corporation, cyclic polyolefins such as polyethersulfone, polyarylate, polyethylene terephthalate, polycarbonate, polymethyl methacrylate, ABS, and triacetyl cellulose. Is preferred. Of these, polycarbonate, polymethyl methacrylate, and ABS are preferred from the viewpoint of high transparency with a light transmittance of 85% or more and ease of molding, and polycarbonate is most preferred from the viewpoint of impact resistance.

As the adhesive layer, there are an adhesive by a wet or dry laminating method and an adhesive by a hot melt or tape laminating method. Wet and dry lamination methods include, for example, reverse coating method, gravure coating method, rod coating method, bar coating method, Mayer bar coating method, die coating method, spray coating method, etc. This is a method of applying a solvent-based adhesive. Adhesives include phenol resin adhesives, resorcinol resin adhesives, phenol-resorcinol resin adhesives, epoxy resin adhesives, urea resin adhesives, urethane resin adhesives, polyurethane resin adhesives, polyesters Thermosetting resin adhesives such as urethane resin adhesive polyaromatic adhesives; reactive adhesives using ethylene-unsaturated carboxylic acid copolymers; vinyl acetate resins, acrylic resins, ethylene vinyl acetate Thermoplastic resin adhesive such as resin, polyvinyl alcohol, polyvinyl acetal, polyvinyl butyral, vinyl chloride resin, nylon, cyanoacrylate resin; chloroprene adhesive, nitrile rubber adhesive, SBR adhesive, natural rubber adhesive Rubber adhesives such as methacrylic resin, photo-curing type B biphenyl, alicyclic epoxy resin, a cationic photopolymerization initiator, acrylate resin (Si, F-containing), photoradical polymerization initiator, and the like such as a light-curable adhesive using a fluorinated polyimide. These resins may be a single polymer or a mixture.
The tape laminating method is a method in which an adhesive on a film or a sheet substrate is directly bonded to a transparent substrate or a half mirror material. After bonding, the base material that becomes the core is peeled off. Examples of the pressure-sensitive adhesive include acrylic pressure-sensitive adhesives, rubber-based pressure-sensitive adhesives, polyalkyl silicon-based pressure-sensitive adhesives, urethane-based pressure-sensitive adhesives, and polyester-based pressure-sensitive adhesives. The hot melt method is a method in which a thermoplastic resin-based pressure-sensitive adhesive is melted and bonded by heat. Thermoplastic resins include vinyl acetate resin, acrylic resin, ethylene vinyl acetate resin copolymer, polyvinyl alcohol copolymer, polyvinyl acetal, polyvinyl butyral, vinyl chloride resin, nylon, cyanoacrylate resin, polyester resin, and mixtures thereof. And copolymers. Among these, an ethylene vinyl acetate copolymer and polyvinyl butyral which are easy to thermocompression are preferable. Moreover, as a joining method by a hot melt method, an extrusion laminating method, a film insert molding method, or the like can be used.

  Since the adhesive layer used in the present invention is required to have high transparency from the viewpoint of high visibility, aesthetics and appearance required for display applications, it is preferable to use an optical clear adhesive (OCA). The optical transparent pressure-sensitive adhesive here is a double-sided pressure-sensitive adhesive having no supporting substrate such as a film or a sheet. In particular, in the present invention, an acrylic pressure-sensitive adhesive is preferable from the viewpoint of adhesion to a laminated film of a half mirror material, stretchability, and followability during molding. Examples of the monomer component constituting the acrylic resin include alkyl acrylate, alkyl methacrylate (alkyl group and methyl group, ethyl group, n-propyl group, isopropyl group, n-butyl group, isobutyl group, t-butyl group, 2- Hydroxy such as ethylhexyl group, lauryl group, stearyl group, cyclohexyl group, phenyl group, benzyl group, phenylethyl group), 2-hydroxy acrylate, 2-hydroxyethyl methacrylate, 2-hydroxypropyl acrylate, 2-hydroxypropyl methacrylate, etc. Group-containing monomers, acrylamide, methacrylamide, N-methylacrylamide, N-methylmethacrylamide, N-methylolacrylamide, N-methylolmethacrylamide, N, N-dimethylolacrylic Amide group-containing monomers such as amide, N-methoxymethylacrylamide, N-methoxymethylmethacrylamide, N-phenylacrylamide, amino group-containing monomers such as N, N-diethylaminoethyl acrylate, N, N-diethylaminoethyl methacrylate, glycidyl acrylate , Amino group-containing monomers such as glycidyl methacrylate, monomers containing a carboxyl group such as acrylic acid, methacrylic acid and salts thereof (lithium salt, sodium salt, potassium salt, etc.) or salts thereof can be used. Copolymerized using seeds or two or more monomers. In addition, they can be copolymerized with a wide variety of monomers. Examples of the various monomers include sulfonic acid groups such as epoxy group-containing monomers such as acrylic glycidyl ether, styrene sulfonic acid, vinyl sulfonic acid, and salts thereof (lithium salt, sodium salt, potassium salt, ammonium salt, etc.) Monomers containing a carboxyl group such as a monomer containing a salt, crotonic acid, itaconic acid, maleic acid, fumaric acid and salts thereof (lithium salt, sodium salt, potassium salt, ammonium salt, etc.), or maleic anhydride , Monomers containing acid anhydrides such as itaconic anhydride, vinyl isocyanate, allyl isocyanate, styrene, vinyl methyl ether, vinyl trisalkoxysilane, alkyl maleic acid monoester, alkyl fumaric acid monoester, acryloni Lil, methacrylonitrile, alkyl itaconic acid monoester, vinylidene chloride, vinyl acetate, etc. can be used vinyl chloride.

Further, a modified acrylic copolymer, for example, a block copolymer modified with polyester, urethane, epoxy or the like, a graft copolymer, and the like are also possible.

  Furthermore, examples of commercially available acrylic pressure-sensitive adhesives include, for example, OCA 8146, 8171, 8172, 8173D, 8180, 8182, 8185, 8187, 8188, 8189, 8191, 8192, 8095, and 9483 manufactured by 3M USA or Sumitomo 3M. 8146, CEF08A04, 05, 06, 07 series, MO-3005C / G, MO-3006C / G, MO-2105G / I, MO-2106G / I, manufactured by Lintec Corporation, CR9707, CS9621T, CS9622T, CS3623 manufactured by Nitto Denko Corporation , CS9663L, CS9662L, TD06A, TI14A, MA54A manufactured by Yodogawa Paper Co., Ltd., SANAKY OP, DH, DK type manufactured by Sanei Kaken Co., Ltd. 5400 series 5402, 5405 manufactured by Sekisui Chemical Co., Ltd. 0,8080NR, 0835N, LT6003W, Z87011W, Z87012W, Toyo Ink Co., Ltd. FS601, manufactured by Hitachi Chemical Co., Ltd. Fine set TE-250S121, and the like Panac Co. PDS1. These thicknesses are preferably 25 μm or more from the viewpoint that the uneven luminance distribution becomes smaller as the adhesive layer is thicker. If the adhesive layer is too thick, the upper limit is 400 μm or less from the viewpoint that defects such as burrs are likely to occur after bonding. More preferably, they are 50 micrometers or more and 200 micrometers or less. Various additives such as viscosity modifiers, plasticizers, leveling agents, anti-gelling agents, antioxidants, heat stabilizers, light stabilizers, UV absorbers, lubricants, pigments, dyes, organic or Inorganic fine particles, fillers, antistatic agents, nucleating agents, curing agents and the like may be blended.

  The half mirror material needs to be a laminated film in which 50 layers or more of layers made of the thermoplastic resin A (A layer) and layers made of the thermoplastic resin B (B layer) are alternately laminated.

  Examples of the thermoplastic resin suitably used in the present invention include chain polyolefins such as polyethylene, polypropylene, poly (4-methylpentene-1) and polyacetal, ring-opening metathesis polymerization of norbornene, addition polymerization, and other olefins. Addition copolymer of alicyclic polyolefin, biodegradable polymer such as polylactic acid, polybutyl succinate, polyamide such as nylon 6, nylon 11, nylon 12, nylon 66, aramid, polymethyl methacrylate, polyvinyl chloride , Polyvinylidene chloride, polyvinyl alcohol, polyvinyl butyral, ethylene vinyl acetate copolymer, polyacetal, polyglycolic acid, polystyrene, styrene acrylonitrile copolymer, styrene copolymer polymethyl methacrylate, polycarbonate Polyesters such as polypropylene terephthalate, polyethylene terephthalate, polybutylene terephthalate, polyethylene-2,6-naphthalate, polyethersulfone, polyetheretherketone, modified polyphenylene ether, polyphenylene sulfide, polyetherimide, polyimide, polyarylate, tetrafluoride An ethylene resin, a trifluorinated ethylene resin, a trifluorinated ethylene chloride resin, a tetrafluoroethylene-6 fluoropropylene copolymer, polyvinylidene fluoride, or the like can be used. Among these, it is particularly preferable to use polyester from the viewpoint of good extrusion molding and strength, heat resistance, transparency, and versatility. These may be a homopolymer, a copolymer, or a mixture.

  The polyester is preferably a polyester obtained by polymerization from a monomer mainly composed of an aromatic dicarboxylic acid or an aliphatic dicarboxylic acid and a diol. Here, as the aromatic dicarboxylic acid, for example, terephthalic acid, isophthalic acid, phthalic acid, 1,4-naphthalenedicarboxylic acid, 1,5-naphthalenedicarboxylic acid, 2,6-naphthalenedicarboxylic acid, 4,4′-diphenyl Examples include dicarboxylic acid, 4,4'-diphenyl ether dicarboxylic acid, 4,4'-diphenylsulfone dicarboxylic acid, and the like. Examples of the aliphatic dicarboxylic acid include adipic acid, suberic acid, sebacic acid, dimer acid, dodecanedioic acid, cyclohexanedicarboxylic acid and ester derivatives thereof. Of these, terephthalic acid and 2,6 naphthalenedicarboxylic acid exhibiting a high refractive index are preferable. These acid components may be used alone or in combination of two or more thereof, and further may be partially copolymerized with oxyacids such as hydroxybenzoic acid.

  Examples of the diol component include ethylene glycol, 1,2-propanediol, 1,3-propanediol, neopentyl glycol, 1,3-butanediol, 1,4-butanediol, and 1,5-pentanediol. 1,6-hexanediol, 1,2-cyclohexanedimethanol, 1,3-cyclohexanedimethanol, 1,4-cyclohexanedimethanol, diethylene glycol, triethylene glycol, polyalkylene glycol, 2,2-bis (4- Hydroxyethoxyphenyl) propane, isosorbate, spiroglycol and the like. Of these, ethylene glycol is preferably used. These diol components may be used alone or in combination of two or more.

  Among the polyesters described above, in order to express a high reflectance by interference reflection, the thermoplastic resin A is made of polyethylene terephthalate, polyethylene naphthalate, polybutylene terephthalate, Butylene naphthalate, polyhexamethylene terephthalate, and polyhexamethylene naphthalate are preferable, and polyethylene terephthalate or polyethylene naphthalate is particularly preferable from the viewpoint of versatility and moldability. Oriented crystallization is accompanied by an increase in refractive index and can impart high heat resistance and waist strength. On the other hand, it is preferable to use these copolymers for the thermoplastic resin B from the viewpoint of delamination and lamination. Here, the term “laminate” refers to an appearance defect such as a flow mark due to a disorder of lamination.

  A laminated film in which 50 layers or more of layers made of the thermoplastic resin A (A layer) and layers of the thermoplastic resin B (B layer) are alternately laminated is manufactured using a laminating apparatus described in the known patent number 4552936. Can do. However, the gap and length of the slit plate are different because of design values that determine the layer thickness. That is, the layer thickness distribution of the resulting laminated film is different, and the thickness of each layer and its arrangement are different.

  The reflectance of the half mirror material used in the head-up display according to the present invention needs to be 13% or more and 70% or less. If the reflectance is less than 13%, the information displayed on the display unit cannot be visually recognized. On the other hand, if the reflectance exceeds 70%, it is impossible to visually recognize external information outside the transparent substrate as viewed from the observer. This decrease in visibility is a problem in terms of safety in vehicles such as airplanes and automobiles, and is different from the main point of achieving both information and external information without changing the field of view, which is the original purpose. . Preferably, it is 55% or less and 15% or more. More preferably, it is 40% or less and 20% or more. The reflectance can be adjusted by alternately laminating the A layer and the B layer, and adjusting the arrangement of the layers, the number of the laminated layers, and the in-plane refractive index difference between the A layer and the B layer. The in-plane refractive index difference is preferably 0.01 or more from the viewpoint of causing interference reflection, and if the in-plane refractive index difference is too large, the reflectivity is increased and the external visibility is decreased. Preferably there is. The half mirror material is most preferably 0.02 to 0.06. As for the arrangement of the layers, the layer thickness corresponding to the desired reflection wavelength λ is selected for the adjacent A layer and B layer having a layer thickness of 30 to 500 nm or less in accordance with the theory of interference reflection of the following equation (1). It is preferable.

2 × (Na · da + Nb · db) = n × λ (1) Formulas Na and Nb are in-plane refractive indexes of the A and B layers of the laminated film, respectively, and da and db are the A and B layers, respectively. The thickness of each layer. λ is a reflection wavelength, and n is a natural number. A reflection phenomenon that satisfies n = 1 is called primary reflection. From the viewpoint of increasing the stiffness of the laminated film and reducing the cocoon skin, it is preferable to use the second to fourth reflections.
The layer thickness distribution of the A layer and the B layer may have a structure in which the layer thickness is constant, has a slope (straight line), and includes a plurality of slopes in the relationship between the layer number and the layer thickness of one layer. The layer thickness distribution of the A layer and the B layer of the laminated film of the present invention has three inclined structures, and adopts an inclined structure in which the vicinity of the surface layer becomes thin, thereby reflecting the wavelength of visible light uniformly. Specifically, a structure including a plurality of inclinations described in JP 2011-129110 A [0034] to [0036] is preferable. Furthermore, the outermost layer of the laminated film of the present invention is preferably provided with a thick film layer having a layer thickness of 1 μm or more. The thick film layer is preferable because it serves to prevent the unevenness of the adhesive layer from being transferred to the internal thin film layer. The thick film layer is more preferably 5 μm or more, and further preferably 10 μm or more. If the thick film layer is too thick, the inner layer thickness distribution is also affected, so 50 μm or less is preferable.

  A uniform reflection of visible light wavelength is preferable because the display portion is not colored and visibility is improved. The saturation C * of this reflected light is 8 or less, more preferably 3 or less. Also, if the number of laminated layers is small, the overall thickness will be thin and the stiffness of the laminated film will be weakened. Therefore, an appearance defect called cocoon skin will occur at the interface with the adhesive layer during pasting and molding with a transparent substrate. To do. As a result, the unevenness of the defect luminance distribution becomes large. Therefore, 200 layers or more are preferable, More preferably, it is 500 layers or more, More preferably, it is 800 layers or more.

  The light transmittance of the half mirror material is preferably 30% or more and 85% or less. This is because when the transmittance is less than 30%, it is difficult to visually recognize external information, while when the transmittance exceeds 85%, the information cannot be visually recognized. More preferably, it is 40% or more and 80% or less. Further preferably, it is 50% or more and 75% or less.

  The defect luminance distribution unevenness of the display part of the head-up display needs to be 40% or less. If it exceeds 40%, the appearance defect called cocoon skin is severe, and this is not only a quality problem, but also distortion of the image occurs, making it impossible to accurately view the information. More preferably, the uneven luminance distribution of the display portion is preferably 30% or less. More preferably, it is 20% or less, and almost no cocoon skin can be recognized. The defect luminance unevenness of the present invention will be described with reference to FIG. FIG. 2A shows a cross-sectional view of a display unit 25 including a transparent base material 21, an adhesive layer 22, an easily adhesive layer 23, and a laminated film 24 that is a half mirror material. FIG. 2B shows an example of an image obtained by observing with an optical microscope when the display unit 25 has a cocoon skin-like appearance defect in the visual inspection. The cocoon skin-like appearance defect is caused by a swell interface of several hundred microns to a millimeter order generated at the interface between the adhesive layer 22 and the half mirror material. In the reflected light observation of the optical microscope, when the focal point is adjusted to this interface, an image of a brightness / darkness defect luminance distribution due to the wavy structure is observed. FIG. 2C shows the relationship between the position and the luminance as a line profile by the image analysis software with the broken line 26 in the defect luminance distribution unevenness image of FIG. Note that the black point 27 is seen as a shadow when a foreign object or a bubble is outside the observation interface such as the surface, and is a point that is not an analysis target. The difference between the maximum value 28 and the minimum value 29 in the luminance distribution diagram on the obtained line is divided by the average luminance of the data on the broken line 26 and multiplied by 100 is the defect luminance distribution unevenness.

  In the display part of the head-up display of the present invention, it is preferable that a polyethylene terephthalate or polyethylene naphthalate film is included between the adhesive layer and the half mirror material.

  From the viewpoint that unevenness on the surface of the adhesive layer occurs because the unevenness on the surface of the adhesive layer is transferred to the surface of the laminated film of the half mirror material, the polyethylene terephthalate or polyethylene By inserting the phthalate film, it is possible to prevent uneven transfer to the laminated film. The film thickness is preferably 50 μm or more from the viewpoint of waist strength. If it is too thick, molding defects and the like are liable to occur, so 200 μm or less is preferable.

  The α relaxation temperature in the dynamic viscoelasticity measurement of the half mirror material is preferably 85 ° C. or higher. When it is 85 ° C. or higher, it is difficult to soften at the time of thermoforming, so that the unevenness of the adhesive layer is difficult to transfer, and the cocoon skin that causes poor appearance is suppressed. More preferably, the α relaxation temperature in the dynamic viscoelasticity measurement is 90 ° C. or higher. The α relaxation temperature is preferably 150 ° C. or lower because the moldability deteriorates if the α relaxation temperature is too high. In order to increase the α relaxation temperature, it is preferable to use a thermoplastic resin having a high glass transition point. As the thermoplastic resin A of the half mirror material of the present invention, polyethylene terephthalate or polyethylene naphthalate whose glass transition point is improved to the stretching temperature by orientation crystallization when biaxially stretching is preferable. The thermoplastic resin B is preferably a polyester containing an isophthalic acid, naphthalene dicarboxylic acid, diphenic acid or cyclohexanedicarboxylic acid component, or a polyester containing a spiroglycol, cyclohexanedimethanol, bisphenoxyethanol fluorene or bisphenol A component. A preferable range of these components is 4% or more and 70 mol% or less.

  It is preferable that an easy-adhesion layer using acrylic / urethane copolymer resin, two or more kinds of crosslinking agents and polythiophene as raw materials is provided on one or both sides of the half mirror material of the head-up display according to the present invention.

  Examples of the acrylic monomer used in the acrylic / urethane copolymer resin (A) used in the present invention include alkyl acrylate (the alkyl group is methyl, ethyl, n-propyl, n-butyl, isobutyl, t-butyl, 2-ethylhexyl). , Cyclohexyl etc.), alkyl methacrylate (alkyl groups are methyl, ethyl, n-propyl, n-butyl, isobutyl, t-butyl, 2-ethylhexyl, cyclohexyl etc.), 2-hydroxyethyl acrylate, 2-hydroxyethyl methacrylate, Hydroxy group-containing monomers such as 2-hydroxypropyl acrylate and 2-hydroxypropyl methacrylate, acrylamide, methacrylamide, N-methyl methacrylamide, N-methyl acrylamide, N-methylol Amide group-containing monomers such as rilamide, N-methylolmethacrylamide, N, N-dimethylolacrylamide, N-methoxymethylacrylamide, N-methoxymethylmethacrylamide, N-butoxymethylacrylamide, N-phenylacrylamide, N, N- Amino group-containing monomers such as diethylaminoethyl acrylate and N, N-diethylaminoethyl methacrylate, glycidyl group-containing monomers such as glycidyl acrylate and glycidyl methacrylate, acrylic acid, methacrylic acid and salts thereof (sodium salt, potassium salt, ammonium salt, etc.) A monomer containing a carboxyl group such as a salt thereof or a salt thereof can be used. In the present invention, it is preferable to copolymerize a crosslinkable functional group, and it is particularly preferable to copolymerize N-methylolacrylamide in terms of improving the self-crosslinking property and the crosslinking density. The copolymerization ratio of N-methylolacrylamide is preferably from 0.5 to 5% by weight in terms of copolymerizability and the degree of crosslinking, and more preferably from 1 to 3% by weight in view of the coating appearance. When the amount is less than 0.5% by weight, for example, moisture-resistant adhesion tends to be inferior, and when it exceeds 5% by weight, for example, the stability of the aqueous dispersion of the resin tends to be inferior, and the coating appearance tends to be deteriorated. Examples of the crosslinking agent include melamine crosslinking agent, isocyanate crosslinking agent, aziridine crosslinking agent, epoxy crosslinking agent, methylolized or alkylolized urea, acrylamide, polyamide resin, oxazoline crosslinking agent, and carbodiimide. Cross-linking agents, various silane coupling agents, various titanate coupling agents and the like can be used. From the viewpoint of heat-and-moisture resistance to the printed layer and the adhesive layer, it is preferable that at least one of the crosslinking agents contains an oxazoline-based crosslinking agent and a carbodiimide-based crosslinking agent.

  Furthermore, when only the easy-adhesive layer component is used, it is easy to be charged. As a result, foreign matters are mixed between the easy-adhesive layer and the adhesive layer due to static electricity, causing a quality problem that causes a poor appearance. The easy adhesion layer of the laminated film which is the half mirror material of the present invention preferably contains a conductive polymer from the viewpoint of antistatic. As the conductive polymer, polypyrrole, polyaniline, polyacetylene, polythiophene, polyphenylene vinylene, polyphenylene sulfide, poly-p-phenylene, polyheterocycle vinylene, particularly preferably (3,4-ethylenedioxythiophene) ( PEDOT).

The waist strength of the laminated film, which is a half mirror material used in the head-up display of the present invention, is preferably 3N · (mm) ² or more from the viewpoint that the unevenness of the adhesive layer is difficult to transfer. More preferably, it is 10 N · mm ² or more. The strength of the waist is proportional to the Young's modulus and proportional to the cube of the thickness. Therefore, it is preferable to adjust the thickness and Young's modulus to be high, the thickness is preferably 150 μm or more, and the Young's modulus is preferably 3.5 GPa or more. As the resin that achieves a high Young's modulus, polyethylene terephthalate or polyethylene naphthalate that is oriented and crystallized by stretching is preferably used for the thermoplastic resin A. As the stretching conditions, in order to draw out a high Young's modulus by forming a higher-order structure of a polymer chain by stretching, the former is preferably a stretching temperature of 80 to 95 ° C., the stretching ratio is preferably 3.3 to 5 times, and the heat treatment temperature is 200 degreeC or more and less than 230 degreeC are preferable. Furthermore, it is preferable that the A layer to which orientation crystallization is strongly imparted is made thicker than the thickness of the B layer. The optical lamination ratio obtained by multiplying the thickness ratio of the adjacent A layer and B layer by the in-plane refractive index ratio is preferably 2 or more and 5 or less. This is because if the optical lamination ratio exceeds 5, the interference reflection phenomenon hardly occurs and the reflectance decreases.

  In the cross-cut test of the display part of the head-up display of the present invention after 60 ° C., 90% humidity, and 72 hours treatment, the number of peels in 100 squares is preferably 5 or less. Moisture resistance is attributed to the interfacial adhesive force between the easy-adhesion layer and the adhesive layer, and a preferred combination is an easy-adhesion layer comprising an acrylic / urethane copolymer resin and two or more crosslinking agents and an acrylic adhesive layer. . Moreover, from the viewpoint of moisture and heat resistant adhesion between the layers of the laminated film, it is preferable to use polyester containing bisphenol A for the B layer.

  The half mirror material of the present invention is preferably successively biaxially stretched. The projector that projects information can be a liquid crystal panel or a projector. In a liquid crystal panel, linearly polarized light is emitted from the liquid crystal panel, but it is hardly affected by polarization because it is sequentially biaxially stretched. Similarly, in projectors, the polarization directions of red, blue, and green are not all the same because of the optical system, so in the case of a polarizing reflector such as a uniaxially stretched film, yellow, purple, etc. However, the half mirror material of the present invention which is close to isotropic has almost no influence.

  The thermoplastic resin A constituting the half mirror material is preferably polyethylene terephthalate or polyethylene naphthalate from the viewpoints of moldability and waist strength. The layer A made of the resin A is more preferable since orientational crystallization is imparted by biaxial stretching, since the film becomes stiff.

  Polyester using bisphenol A and cyclohexanedimethanol as all or part of the diol component from the viewpoint that the thermoplastic resin B constituting the half mirror material achieves an increase in the α relaxation temperature while suppressing an increase in the refractive index. It is preferable that These may be copolymerized or polymer alloys. In particular, a polymer alloy of polyester and polycarbonate obtained by copolymerizing cyclohexanedimethanol in an amount of 30 mol% to 70 mol% is preferable in terms of performance. The weight concentration of polycarbonate is preferably 30% or less from the viewpoint of co-stretchability.

  The projector is preferably a laser projector. The laser projector has a feature that does not require a reduction in size and weight and focusing of an image. When the laser projector is used in the head-up display of the present invention, it is useful for low power consumption as well as sharpness of an image. Furthermore, the head-up display of the present invention is optimal for applications such as automobiles, aircraft, and game machines.

  It is preferable that the structure of the display part of this invention is the transparent base material 21, the adhesive layer 22, the laminated film 24 which is a half mirror material, the adhesive layer 22, and the transparent base material 21 shown in FIG. Such a sandwich structure is preferable in that damage to the half mirror material can be prevented. Although the production method depends on the material of the adhesive layer, in general, for the adhesion between the transparent substrate and the half mirror material, pre-compression under vacuum conditions and then thermocompression are preferable from the viewpoint of adhesion.

  The display unit of the present invention is preferably movable. In the case of the movable type, the arrangement as shown in FIG. 4 is preferable rather than being fixedly arranged on the window member. FIG. 4 shows an example of a schematic diagram of a movable display unit. The display unit of the present invention can be arranged in the storage place 30 from the viewpoint of convenience when the movable display unit is not used. When the movable display unit is used in an automobile, it can be used as a sun visor when used, which is preferable.

  The display part of the head-up display of the present invention can be created by film insert molding and post-processing molding. With film insert molding, a laminated film, which is a half mirror material that has been subjected to adhesive layers that give adhesion to the injection resin, design printing, hard coat processing, etc., is inserted into a plastic mold (mold), and then heated. This is a film-integrated injection-molded article manufacturing method manufactured by pouring a fluidized molding material (injection resin) into the mold. From the viewpoint of the finish of the molded product, it is preferable that the laminated film is pre-molded in advance, such as press molding, vacuum molding, and vacuum / pressure forming. The film thickness of the laminated film of the present invention is preferably from 50 μm to 350 μm from the viewpoint of easy insert molding. More preferably, they are 80 micrometers or more and 200 micrometers or less. The film thickness can be adjusted by changing the casting speed and the extrusion amount in the film production process.

  As conditions for film insert molding, the injection temperature of the molding resin is the melting temperature of the resin, and generally acrylic is required to have transparency, around 240 ° C. for methyl methacrylate, around 280 ° C. for polyesters such as polycarbonate, In the acrylonitrile-butadiene-styrene copolymer (ABS) system, it is known that the temperature is around 230 ° C. In addition, polystyrene, polycarbonate, etc. are around 270 ° C., and may be determined according to the resin to be used. The mold temperature is preferably 70 ° C. or higher and 150 ° C. or lower from the viewpoint of moldability and adhesiveness of the half mirror material of the present invention.

  Post-processing molding means that the display part before molding is formed into a molded product by post-processing such as press molding, vacuum molding, or vacuum / pressure forming. The molding temperature is preferably performed at a temperature equal to or higher than the glass point of the transparent substrate, and is 70 ° C or higher and 240 ° C or lower.

An evaluation method of physical property values used in the present invention will be described.
(Method for evaluating physical properties)
(1) Layer thickness, number of layers, layered structure The layer structure of the laminated film, which is a half mirror material, was determined by observation with a transmission electron microscope (TEM) for a sample cut out of a cross-section using a microtome. That is, using a transmission electron microscope H-7100FA type (manufactured by Hitachi, Ltd.), the cross section of the film was magnified 10000 to 40000 times under the condition of an acceleration voltage of 75 kV, a cross-sectional photograph was taken, the layer configuration and the thickness of each layer Was measured. In some cases, in order to obtain high contrast, a staining technique using a known RuO ₄ or OsO ₄ was used.

Approximately 40,000 times TEM photograph image obtained from the above device is saved to a personal computer as a compressed image file (JPEG) by processing at a print magnification of 620,000 times, and then image processing software Image-Pro This file was opened and image analysis was performed using Plus ver.4 (distributor Planetron Co., Ltd.). In the image analysis processing, the relationship between the thickness in the thickness direction and the average brightness of the region sandwiched between the two lines in the width direction was read as numerical data in the vertical thick profile mode. Using spreadsheet software (Excel 2000), the data of position (nm) and brightness was adopted in sampling step 6 (decimation 6), and then numerical processing of a three-point moving average was performed. Furthermore, the data obtained by periodically changing the brightness is differentiated, and the maximum value and the minimum value of the differential curve are read by a VBA (Visual Basic For Applications) program. It was calculated as the layer thickness of one layer. This operation was performed for each photograph, and the layer thicknesses of all layers were calculated. Of the obtained layer thickness, the thin film layer was a layer having a thickness of 500 nm or less. On the other hand, the layer exceeding 500 nm was made a thick film layer.
(2) Measurement of reflectance A 5 cm square sample was cut out from the central part in the film width direction of the laminated film which is a half mirror material. Subsequently, the relative reflectance in incident angle (phi) = 10 degree | times was measured using the Hitachi spectrophotometer (U-4100 Spectrophotometer). The inner wall of the attached integrating sphere is barium sulfate, and the standard plate is aluminum oxide. The measurement wavelength was 250 nm to 1200 nm, the slit was 5 nm (visible) / automatic control (infrared), the gain was set to 2, and the scanning speed was measured at 600 nm / min. At the time of sample measurement, the back surface of the sample was painted black with oil-based ink in order to eliminate interference due to reflection from the back surface of the sample. Next, the average reflectance in the wavelength range of 400 to 700 nm was determined.

On the other hand, the reflectivity in the in-plane orientation of the film is the reflectivity with a wavelength of 250 to 1200 nm at an azimuth angle obtained by rotating the polarization component in increments of 10 degrees at 0 to 180 ° by installing the attached polarizer manufactured by Granterra. Was measured. The difference between the maximum value and the minimum value of the reflectance at a wavelength of 400 to 700 nm in the measurement result was obtained.
(3) Light transmittance The light transmittance was measured using a fully automatic direct reading haze computer “HGM-2DP” manufactured by Suga Test Instruments Co., Ltd. under conditions of 23 ° C. and relative humidity 65%. . The average value measured three times was used as the light transmittance (%) of the sample.
(4) Nonuniformity in luminance distribution of display part
The display unit was observed using a Leica optical microscope DMLM. The photographing conditions were appropriately adjusted so that a clear image was obtained with a reflection mode, objective lens: x5, resolution of 1300 x 1030 standard, color mode B / W, automatic exposure, and light amount memory of 5-8. Further, the focal length was adjusted so that an image of the interface that was a cocoon skin between the half mirror material and the adhesive layer was obtained. The captured images were saved to a computer as image data using the included software AxioVision3.0. An example of the captured image is shown in FIG.
Next, using the stored image data, the unevenness of the defect luminance distribution was evaluated by image processing software Image-Pro Plus ver.4 (distributor Planetron Co., Ltd.). In the analysis mode, luminance data on a broken line 26 extending in the width direction is collected at the center of the image using a line profile indicated by 26 in FIG.
The obtained luminance data between 2 mm in length was averaged by an Excel VBA (Visual Basic For Applications) program. Data sampling was performed every 6 points, and a 10-point moving average process was performed on the collected data (see FIG. 2C). The average value of these data was obtained, the difference between the maximum value and the minimum value was divided by the average value, and multiplied by 100 to calculate the unevenness of the defect luminance distribution. On the line profile mode image, luminance data at three locations were sampled at equal intervals, and the defect luminance distribution unevenness was calculated for each, and the average value was used as the defect luminance distribution unevenness. Note that in the process of collecting luminance data from the image, black spots and bright spots caused by minute foreign matters on the surface and the laminate interface are excluded because they are not subject to the defect luminance distribution unevenness.
(5) α relaxation temperature The dynamic viscoelasticity measurement of the laminated film was measured using DMS-6100 manufactured by Seiko Instruments Inc. under the following conditions.

Sample length: 20mm (width 5mm)
Minimum load: 50mN
Frequency: 1Hz
Displacement: 5 μm
Temperature program: 25 ℃ start → 250 ℃ end 5min hold (2 ℃ / min)
Next, the α relaxation temperature was determined from the obtained temperature dependence diagram of tan δ. The α relaxation temperature of the laminated film of the present invention is a peak observed near the glass transition point of the resin A layer and the B layer. When two α relaxation temperatures are confirmed, the lower one is defined as the α relaxation temperature. Adopted.
(6) Saturation C *
Cut out from the central part in the width direction of the laminated film at 5 cm × 5 cm, then paint the back of the sample black with Magic Ink (registered trademark) and use a CM-3600d manufactured by Konica Minolta Co., Ltd. Under the conditions A106), L *, a *, and b * values were measured by the SCE method from which specular reflection light was removed and the SCI method including specular reflection light, respectively, and an average value of n number 5 was obtained. The white calibration plate and zero calibration box were calibrated using the following. Further, the saturation C * is obtained as the square root of the sum of the squares of SCI a * and b *. Note that D65 was selected as the light source used for calculation of the colorimetric values.
White calibration plate: CM-A103
Zero calibration box: CM-A104
(7) Waist strength The tensile modulus of elasticity was measured at 25 ° C., 65 using an Instron type tensile testing machine (Orientec Co., Ltd. film tensile elongation automatic measuring device “Tensilon AMF / RTA-100”). It measured based on JIS-K7127 under the environment of% RH. For each of the film width direction (MD direction: Machine Direction) and the film width direction (TD direction: Transverses Direction) from the central portion in the film width direction, a sample film having a width of 10 mm is subjected to a test length of 100 mm and a pulling speed of 200 mm / min. The tensile elastic modulus (Young's modulus) in the longitudinal direction and the width direction of the film was determined. Note that the number of trials, n, was 5, and the average value was adopted. As the Young's modulus, an average value in the longitudinal direction and the width direction was adopted. Next, the waist strength (N · (mm) ² ) of the laminated film was determined based on the following formula (3).
X = 1/12 * E * W * t ^ 3 (3) Formula E: Average value of Young's modulus of MD and TD of laminated film (GPa (= 10 ^ 9 N / m ² ))
W: Film width = 10 mm
t: Film thickness (mm)
(8) Appearance inspection Using a fluorescent lamp whose light source type is F10, the light is incident on the display unit so that the incident angle of light is around 45 °, and the fluorescence reflected on the surface of the display unit as the regular reflection light. The reflected image of the lamp was evaluated according to the following criteria.
A: Image distortion is not observed at all viewing angles.
○: Slight image distortion at a certain viewing angle.
Δ: Slight image distortion at all viewing angles.
X: Insulator-like distortion is strong in the image at all viewing angles.
(9) Formability In order to evaluate the moldability of the laminated film, which is a half mirror material, using a square pillar mold of 80 mm in length x 80 mm in width x 10 mm in height, the preheat temperature of the IR heater is 280 ° C, the mold Ultra-high pressure molding was performed under the conditions of a temperature of 70 ° C. and a pressure of 10 MPa. The obtained molded product was visually confirmed, and the moldability was judged by the following index. The taper angles of the corners of the four corners of the mold were 5 °, 10 °, 15 °, and 20 °.
○: Molded without problems.
(Triangle | delta): Although it shape | molds, there exists a film tear.
X: Cannot be molded.
(10) Moisture and heat-resistant adhesion After the produced display part was allowed to stand for 72 hours in an atmosphere of 70 ° C. and 90% humidity, 100 crosscuts of 1 mm 2 were put on the surface of the laminated film, and manufactured by Nichiban Co., Ltd. A cellophane tape was affixed thereon, pressed with a load of 1.5 kg / cm 2, and then peeled in the 90 ° direction. Evaluation was performed according to the following criteria based on the number remaining.
○: 95 to 100 remaining Δ: 50 to 94 remaining ×: 0 to 49 remaining (11) Number of coarse foreign matters Coarse foreign matters having an average particle diameter of 50 μm or more present in an area per 100 cm ^{2 of the} display portion are made of transparent PET. And a general dot gauge (contamination measurement chart: reference standard JIS P8208 / P8145). The average particle diameter of the coarse transmission foreign matter was measured using a long axis. Evaluation was made according to the following criteria.
○: The number of coarse foreign matters having an average particle size of 50 μm or more is less than 10 Δ: The number of coarse foreign matters having an average particle size of 50 μm or more is 10 or more and less than 49 ×: The number of coarse foreign matters having an average particle size of 50 μm or more is 50 (12) Performance of head-up display The fluorescent lamp 42, the created display unit 25, the notebook computer 40 (10-inch screen size / LTseries manufactured by Gateway), and the visual acuity test table 41 are arranged as shown in FIG. The observer observed the image of the liquid crystal panel of the notebook computer and the symbols on the eye test table at the same time, and judged the performance of the head-up display based on the following evaluation criteria.
(Double-circle): The image of a liquid crystal panel and the symbol of a visual examination table look very clear.
○: The image of the liquid crystal panel and the sign of the eye test table are clearly visible.
Δ: The image on the liquid crystal panel looks clear, but the symbols on the eye test table are slightly difficult to see.
Alternatively, the image on the liquid crystal panel is somewhat difficult to see, but the symbols on the eye test table are clearly visible.
X: The image of the liquid crystal panel and the sign of the eyesight test table are also blurred and difficult to see.

(Thermoplastic resin)
The following were prepared as the resin A.
(Resin A-1) To a mixture of 100 parts by weight of dimethyl terephthalate and 60 parts by weight of ethylene glycol, 0.09 part by weight of magnesium acetate and 0.03 part by weight of antimony trioxide are added with respect to the amount of dimethyl terephthalate. Transesterification is performed by heating and raising the temperature by a conventional method. Subsequently, 0.020 part by weight of 85% aqueous phosphoric acid solution is added to the transesterification product with respect to the amount of dimethyl terephthalate, and then the polycondensation reaction layer is transferred. Further, the reaction system was gradually depressurized while being heated and heated, and a polycondensation reaction was performed at 290 ° C. under a reduced pressure of 1 mmHg by a conventional method to obtain polyethylene terephthalate having IV = 0.61.
(Resin A-2)
Polyethylene naphthalate with IV = 0.57.

On the other hand, as the resin B, the following were prepared.
(Resin B-1) Polyethylene terephthalate copolymerized with IV = 0.72 cyclohexanedimethanol (CHDM 30 mol%).
(Resin B-2) Copolymer polyethylene terephthalate obtained by mixing Resin A-1 and Resin B-1 at 1: 3.
(Resin B-3) Copolymerized polyethylene terephthalate in which resin A-1 and resin B-1 are mixed at 1: 1.
(Resin B-4) IV = 0.73 Polyester resin obtained by mixing polyethylene terephthalate copolymerized with cyclohexanedimethanol (CHDM 60 mol%) and polycarbonate (Idemitsu Kosan A1700) at 85:15.
(Resin B-5) IV = 0.73 Polyethylene terephthalate copolymerized with bisphenoxyethanol fluorene (BPEF 5 mol%).
(Resin B-6) IV = 0.73 Polyethylene terephthalate copolymerized with spiroglycol (SPG 30 mol%).
(Resin B-7) IV = 0.63 Polyethylene naphthalate copolymerized with terephthalic acid (TPA 30 mol%).
(Resin B-8) IV = 0.75 Polyethylene terephthalate copolymerized with 15 mol% of adipic acid.
(Resin B-9) IV = 0.77 Polyethylene terephthalate copolymerized with isophthalic acid (IPA 15 mol%).
(Resin B-10) Copolymerized polyethylene naphthalate obtained by mixing Resin A-2 and Resin B-7 at 1: 3.
(Resin B-11) Polycarbonate (Idemitsu Kosan A1700)
An easy-adhesion layer and the following were prepared.
(Easy adhesion I)
A water-based coating composition “composition” of acrylic / urethane copolymer resin and 125 parts by weight of a crosslinking agent with respect to 5 parts by weight of colloidal silica having a particle size of 80 nm.
Acrylic / urethane copolymer resin (A): An acrylic / urethane copolymer resin anionic aqueous dispersion (“Sannaron” WG-353 (prototype), manufactured by Shannan Synthetic Chemical). The weight ratio of acrylic resin component / urethane resin component (polycarbonate) is 12/23, and 2 parts by weight of triethylamine is used to form an aqueous dispersion.
Oxazoline compound (B):
Oxazoline-containing polymer aqueous dispersion (Nippon Shokubai "Epocross" WS-500)
Carbodiimide compound (C):
Carbodiimide aqueous crosslinking agent (Nisshinbo Chemical Co., Ltd. “Carbodilite” V-04)
Polythiophene resin (D):
Polyethylene dioxythiophene (Bytron PEDOT made by Kaken Sangyo)
Solid content weight ratio:
(A) / (B) / (C) / (D) = 100 parts by weight / 30 parts by weight / 30 parts by weight / 8 parts by weight (easy adhesion II)
In the composition of easy adhesion I, the composition obtained by removing only the polythiophene resin (easy adhesion III)
A water-based coating composition “composition” of vinyl acetate / acrylic resin having the following composition and 125 parts by weight of a crosslinking agent with respect to 5 parts by weight of colloidal silica having a particle size of 100 nm.
Vinyl acetate / acrylic aqueous dispersion 1 0 0 parts by weight Melamine crosslinking agent 2 5 parts by weight

(Adhesive layer)
The following transparent adhesive was prepared as a material for the adhesive layer.

・ 3M acrylic adhesive (OCA) 8172 thickness 50μm
・ 3M acrylic adhesive (OCA) 8171 thickness 25μm
・ 3M acrylic adhesive (OCA) 81466-2 thickness 50 μm
・ 3M acrylic adhesive (OCA) 8146-3 thickness 75μm
-3M acrylic adhesive (OCA) 8146-4 thickness 100 μm
・ Ayukawa Paper's acrylic adhesive TD06A thickness 50μm
・ Ashikawa Paper's acrylic adhesive TD06A thickness 25μm
・ Yodogawa Paper Acrylic Adhesive TD06A Thickness 10μm
・ Lintec MO-3006G 50μm thick

[Example 1]
(Half mirror material film formation)
Resin A-1 was vacuum dried at 180 ° C. for 3 hours, while Resin B-1 was dried under nitrogen at 100 ° C., and then fed into two twin-screw extruders in a closed conveyance line. It was melted at 280 ° C. and kneaded. A nitrogen purge was performed on the lower part of the hopper. Next, foreign matters such as oligomers and impurities were removed by vacuum venting at two vent holes with a vacuum pressure of 0.1 kPa or less. Further, Q / Ns, which is the ratio of the feedstock to the twin screw extruder and the screw rotation speed, was set to 2 and 1.5, respectively. After passing through 10 FSS type leaf disk filters each with a filtration accuracy of 6 μm, and measuring with a gear pump so that the discharge ratio (lamination ratio) is thermoplastic resin A / thermoplastic resin B = 3/1, In the same manner as the laminating apparatus described in Japanese Patent No. 4552936, the 801-layer laminating apparatus merged to obtain a laminated body in which 801 layers were alternately laminated in the thickness direction. However, the layer thickness distribution is a laminate having three inclined structures for each of the A layer and the B layer described in JP 2011-129110 A [0034] to [0036], and the outermost layer is a thick film layer. . In one inclined structure, 267 layers of A layers and B layers are alternately laminated, and three inclined structures are arranged so that the layer thickness is the thinnest in the vicinity of both surfaces of the laminated film. In the three inclined structures, a slit design was adopted in which the inclination, which is the ratio of the maximum layer thickness / minimum thickness, was 2.8 in the design of the thin film layer of the A layer or B layer inclined structure. Next, the laminate is supplied to a T-die and formed into a sheet, and then rapidly cooled and solidified on a casting drum whose surface temperature is maintained at 25 ° C. while applying an electrostatic applied voltage of 8 kV with a wire, and unstretched A film was obtained. This unstretched film is heated with a radial heater using a longitudinal stretching machine, stretched at a stretching temperature of 105 ° C. and stretched 3.3 times in the longitudinal direction of the film, subjected to corona treatment, and the easy-adhesion layer I is coated on both sides with a # 4 metabar. Was granted. Next, after guiding both ends to a tenter gripped with clips, the film was stretched 4.2 times in the film width direction at 110 to 130 ° C., and then heat-treated at 230 ° C. and relaxed in the film width direction of about 3% at 150 ° C. The treatment was carried out to obtain a laminated film having a thickness of 95 μm. The layer thickness distribution of the obtained laminated film includes three inclined structures for each of the A layer and the B layer, the thin film layer from the surface layer side to the 267th layer, and both the A layer and the B layer from the surface layer side. It had an inclined structure in which the layer thickness increased monotonously. The remaining 267 layers at the center in the film thickness direction also had an inclined structure. Moreover, the thick film layer of the surface layer was 1.5 μm. A moderately glossy and strong half mirror material could be obtained. The relative reflectance by the spectrophotometer was uniform and colorless in the wavelength range of 400 to 900 nm.
As for the α relaxation temperature, a main peak was confirmed at 110 ° C., and a peak at 146 ° C. was confirmed on the high temperature side at the shoulder.
(Production of display part)
A transparent substrate made of polycarbonate having a size of 40 cm × 30 cm × thickness of 3 mm was prepared, and an acrylic pressure-sensitive adhesive (OCA) 8172 manufactured by 3M was prepared for the adhesive layer. The thickness of the adhesive layer is 50 μm. In a clean room, using a sheet laminator, first, the adhesive layer and the laminated film as the half mirror material were bonded together, and then the laminated film with the adhesive layer and the transparent substrate were bonded together. In the appearance inspection, the obtained display part was free of cocoon skin, no coarse foreign matter, and a transparent display part free from delamination and foaming after the wet heat test was obtained. Furthermore, good results were obtained for the performance as a head-up display. Table 1 shows the evaluation results of the half mirror material, the display unit, and the head-up display.

[Example 2]
A half mirror material is used in the same manner as in Example 1 except that the lamination ratio and the thermoplastic resin B are changed to 1 and B-1 from Example 1 and the drawing temperature is changed to 95 ° C. in a longitudinal drawing machine. A laminated film was formed. Table 1 shows the evaluation results of the obtained half mirror material, display unit, and head-up display. The image of the liquid crystal panel by the reflected light looks clear, but the sign of the visual acuity test table seen by the transmitted light is somewhat difficult to see due to the influence of cocoon skin, but there is no problem as a head-up display performance Met.

[Examples 3 to 4]
Resin B-1 of Example 2 was changed to Resin B-2 and Resin B-3, respectively, and a laminated film as a half mirror material was formed in the same manner as in Example 2. Table 1 shows the evaluation results of the obtained half mirror material, display unit, and head-up display. Although the display portion of Example 3 is slightly distorted at a certain viewing angle, the performance of the head-up display is that both the image of the liquid crystal panel by reflected light and the sign of the visual acuity test table viewed by transmitted light are clearly visible. Good display performance was obtained. On the other hand, in Example 4, the image on the liquid crystal panel was somewhat difficult to see because of the low reflectance, but there was no problem as a head-up display.

[Example 5]
Next, resin B-3 of Example 4 was changed to resin B-4, and an unstretched film was obtained in the same manner as in Example 4. This unstretched film was stretched 3.3 times in the longitudinal direction of the film at 105 ° C. with a longitudinal stretching machine, subjected to corona treatment, and an easy adhesion layer I was applied to both sides with a # 4 metabar. Next, both ends are guided to a tenter gripped by clips, and stretched by 4.2 times in the film width direction at 110 ° C., and then heat-treated at 230 ° C., and relaxed in the film width direction by about 3% at 150 ° C. The laminated film having a thickness of 95 μm was obtained. In the appearance inspection, the obtained display part was free from cocoon skin, no coarse foreign matter, and a display part free from delamination and foaming after the wet heat test was obtained. Furthermore, good results were obtained for the performance as a head-up display. Table 1 shows the evaluation results of the half mirror material, the display unit, and the head-up display.

[Example 6]
A laminated film, which is a half mirror material, was formed in the same manner as in Example 5 except that the lamination ratio was changed to 3.5 from Example 5. Table 1 shows the evaluation results of the obtained half mirror material, display unit, and head-up display. No aubergine skin was observed, and good results were obtained for the performance as a head-up display.

[Example 7]
Resin B-4 in Example 5 was changed to Resin B-5, and a laminated film as a half mirror material was formed in the same manner as in Example 5. Table 1 shows the evaluation results of the obtained half mirror material, display unit, and head-up display. No aubergine skin was observed, and good results were obtained for the performance as a head-up display.

[Example 8]
Resin B-4 of Example 5 was changed to Resin B-6, and a laminated film as a half mirror material was formed in the same manner as in Example 5. Table 1 shows the evaluation results of the obtained half mirror material, display unit, and head-up display. Although the image of the liquid crystal panel by the reflected light looks clear, the symbols of the visual acuity test table viewed with the transmitted light are difficult to see, but the head-up display performance has no problem.

[Example 9]
After resin A-1 was vacuum dried at 180 ° C. for 3 hours, while resin B-10 was dried under nitrogen at 100 ° C., each was fed into two twin-screw extruders in a closed conveyance line. It was melted at 280 ° C. and kneaded. A nitrogen purge was performed on the lower part of the hopper. Next, foreign matters such as oligomers and impurities were removed by vacuum venting at two vent holes with a vacuum pressure of 0.1 kPa or less. Further, Q / Ns, which is the ratio of the feedstock to the twin screw extruder and the screw rotation speed, was set to 2 and 1.5, respectively. After passing through 10 FSS type leaf disk filters each with a filtration accuracy of 6 μm, and measuring with a gear pump so that the discharge ratio (lamination ratio) is thermoplastic resin A / thermoplastic resin B = 1/1, In the same manner as the laminating apparatus described in Japanese Patent No. 4552936, the 801-layer laminating apparatus merged to obtain a laminated body in which 801 layers were alternately laminated in the thickness direction. However, the layer thickness distribution is a laminate having three inclined structures for each of the A layer and the B layer described in JP 2011-129110 A [0034] to [0036], and the outermost layer is a thick film layer. . In one inclined structure, 267 layers of A layers and B layers are alternately laminated, and three inclined structures are arranged so that the layer thickness is the thinnest in the vicinity of both surfaces of the laminated film. In the three inclined structures, a slit design was adopted in which the inclination, which is the ratio of the maximum layer thickness / minimum thickness, was 2.8 in the design of the thin film layer of the A layer or B layer inclined structure. Next, the laminate is supplied to a T-die and formed into a sheet, and then rapidly cooled and solidified on a casting drum whose surface temperature is maintained at 25 ° C. while applying an electrostatic applied voltage of 8 kV with a wire, and unstretched A film was obtained. The unstretched film was stretched 3.3 times in the longitudinal direction of the film at 145 ° C. with a longitudinal stretching machine, subjected to corona treatment, and an easy adhesion layer I was applied to both sides with a # 4 metabar. Next, after guiding both ends to a tenter gripped with clips, the film was stretched 4.2 times in the film width direction at 155 ° C. and then subjected to a heat treatment at 240 ° C., followed by a relaxation treatment in the film width direction of about 3% at 150 ° C. The laminated film having a thickness of 95 μm was obtained. The layer thickness distribution of the obtained laminated film includes three inclined structures for each of the A layer and the B layer, the thin film layer from the surface layer side to the 267th layer, and both the A layer and the B layer from the surface layer side. It had an inclined structure in which the layer thickness increased monotonously. The remaining 267 layers at the center in the film thickness direction also had an inclined structure. Moreover, the thick film layer of the surface layer was 1.5 μm. A moderately glossy and strong half mirror material could be obtained. The relative reflectance by the spectrophotometer was uniform and colorless in the wavelength range of 400 to 900 nm. As for the α relaxation temperature, a main peak was confirmed at 144 ° C., and a peak at 110 ° C. was confirmed at the shoulder. In the moldability of the half mirror material, tearing was observed where it was stretched excessively after molding.
(Production of display part)
A transparent substrate made of polycarbonate having a size of 40 cm × 30 cm × thickness of 3 mm was prepared, and an acrylic pressure-sensitive adhesive (OCA) 8172 manufactured by 3M was prepared for the adhesive layer. The thickness of the adhesive layer is 50 μm. In a clean room, using a sheet laminator, first, the adhesive layer and the laminated film as the half mirror material were bonded together, and then the laminated film with the adhesive layer and the transparent substrate were bonded together. In the appearance inspection, the obtained display part was free from cocoon skin, no coarse foreign matter, and a display part free from delamination and foaming after the wet heat test was obtained. Although the image of the liquid crystal panel by the reflected light looks clear, the symbols of the visual acuity test table viewed with the transmitted light are difficult to see, but the head-up display performance has no problem. Table 1 shows the evaluation results of the half mirror material, the display unit, and the head-up display.

[Example 10]
Example 3 was the same as Example 3 except that the adhesive layer of Example 3 was changed to an acrylic adhesive (OCA) 8146-3 manufactured by 3M having a thickness of 75 μm. The cocoon skin was less visible than in Example 3, and good results were obtained for the performance of the head-up display.

[Examples 11 to 12]
Gravure type rolls that are 100 μm and 50 μm films of polyester film type U46 manufactured by Toray Industries, Inc. using polyester thermosetting adhesives, respectively, to the laminated films obtained in Examples 2 and 3. Lamination was performed using a laminator, and drying was performed at 60 ° C. to prepare a half mirror material as a bonded product. Hereinafter, in the same manner as in Example 2, a display unit was produced, and the performance of the head-up display was evaluated. However, the bonding surface with the adhesive layer was the U46 polyester film side. Table 1 shows the evaluation results of the obtained half mirror material, display unit, and head-up display. No aubergine skin was observed, and good results were obtained for the performance as a head-up display.

[Example 13]
The easy adhesion I of the laminated film of Example 2 was changed to easy adhesion II, and then the pressure-sensitive adhesive layer at the time of producing the display part was changed to a thickness of 25 μm and an acrylic pressure-sensitive adhesive TD06A made by Yodogawa Paper. Table 1 shows the evaluation results of the obtained half mirror material, display unit, and head-up display. A little aubergine skin was seen, resulting in slightly inferior foreign matter and wet heat resistance.

[Examples 14 to 16]
Using the half mirror material of Example 5, the transparent substrate was changed to a polymethylmethacrylate plate having a thickness of 2 mm in Example 14, a soda glass plate having a thickness of 3 mm in Example 15, and an adhesive layer was further implemented. In Example 15, the acrylic adhesive (OCA) 8146-2 manufactured by 3M with a thickness of 50 μm was used, and in Example 16, the acrylic adhesive TD06A manufactured by Yodogawa Paper manufactured in 50 μm was used. Was made. Table 1 shows the evaluation results of the obtained half mirror material, display unit, and head-up display. No aubergine skin was observed, and good results were obtained for the performance as a head-up display.

[Example 17]
In the slit plate constituting the laminating apparatus, using the laminating apparatus that performed the gap processing of the slit so that the outermost layer of the laminated film becomes thick, the laminating ratio was changed to 1.5, and in the same manner as in Example 5, A laminated film was obtained. However, the easy adhesion layer was changed to easy adhesion II. The thick film layer of the outermost layer thickness of the obtained laminated film had a thickness of 10 μm. Furthermore, the adhesive layer of Example 5 of the display part was changed to Lintec MO-3006G having a thickness of 50 μm to produce a display part. Table 1 shows the evaluation results of the obtained half mirror material, display unit, and head-up display. No aubergine skin was observed, and good results were obtained for the performance as a head-up display.

[Reference Example 1]
An unstretched film was obtained in the same manner as in Example 9 except that the resin B-10 in Example 9 was changed to the resin B-7 and the easy-adhesion layer was changed. Next, this unstretched film was passed through a longitudinal stretching machine, led to a tenter that grips both ends with clips, and stretched by 150 times at a temperature of 150 ° C. in the film width direction, and then subjected to a heat treatment at 160 ° C. A relaxation treatment was carried out at about 3% in the film width direction at about 3% to obtain a laminated film having a thickness of 95 μm. As a result of examining the reflectance in the in-plane orientation of the obtained film, the difference between the maximum value and the minimum value was 60% or more, so that it was confirmed to be a polarizing reflector. In addition, since the obtained film was cut out from the film width direction center part, the main orientation direction is a film width direction. Moreover, it had the characteristic that it was easy to tear at the film width direction at the time of shaping | molding.
(Production of display part)
A transparent substrate made of polycarbonate having a size of 40 cm × 30 cm × thickness of 3 mm was prepared, and an acrylic pressure-sensitive adhesive (OCA) 8172 manufactured by 3M was prepared for the adhesive layer. The thickness of the adhesive layer is 50 μm. In a clean room, using a sheet laminating machine, first, the adhesive layer and the laminated film as the half mirror material are bonded together so that the main orientation of the half mirror material is 45 ° in the transparent substrate, and then the adhesive layer The laminated film attached with and a transparent substrate were bonded together. In the appearance inspection, the obtained display portion was confirmed to have a little linear aubergine skin, easily charged due to the absence of an easy-adhesion layer, and some coarse foreign matters were observed.
(Head-up display performance evaluation)
Next, performance evaluation of the head-up display was performed. In this sample, when the narrow angle is 10 degrees or less among the angles formed by the direction of linearly polarized light and the direction of polarization of the half mirror material, the image tends to be clear, and conversely, when the angle is 80 to 90 degrees, the image tends to be unclear. It was confirmed that it was very difficult to design. Moreover, when the display part of the structure shown in FIG. 3 was produced using the same base material and adhesive material, coloring was also seen. The same was true for observation with polarized sunglasses. On the other hand, in other examples, coloring was not confirmed. Table 1 shows the evaluation results of the half mirror material, the display unit, and the head-up display.

[Example 18]
The lamination ratio of Example 2 was changed to 3, and a laminated film was obtained. Further, an adhesive layer was formed and changed to an acrylic adhesive (OCA) 8146-4 manufactured by 3M having a thickness of 100 μm to produce a display unit. did.
Table 1 shows the evaluation results of the obtained half mirror material, display unit, and head-up display. Good results were also obtained for the performance as a head-up display.

[Comparative Example 1]
The lamination ratio of Example 4 was changed to 3, a laminated film was obtained, and a display unit was produced in the same manner as in Example 4. Table 1 shows the evaluation results of the obtained half mirror material, display unit, and head-up display. As for the performance as a head-up display, no cocoon skin was observed, but the visibility of information on the liquid crystal panel was poor, and good results were not obtained.

[Comparative Example 2]
Resin B-1 in Example 2 was changed to Resin B-8, and easy adhesion I was changed to easy adhesion II, and a laminated film was obtained in the same manner as in Example 2. The thickness of the adhesive layer was changed to 25 μm. Table 1 shows the evaluation results of the obtained half mirror material, display unit, and head-up display. Regarding the performance as a head-up display, the cocoon skin was severe and the information on the liquid crystal panel could not be recognized correctly.

[Comparative Example 3]
Resin B-10 in Example 9 was changed to Resin B-9, and easy adhesion I was changed to easy adhesion II, and a laminated film was obtained in the same manner as in Example 9. The thickness of the adhesive layer was changed to 25 μm. The reflectivity was too high, external information could not be recognized, and the performance as a head-up display was poor. In addition, the luminance distribution unevenness could not be measured.

[Comparative Example 4]
Table 1 shows the evaluation results of the obtained half mirror material, display unit, and head-up display by changing the adhesive layer used in the display unit of Example 2. About the performance as a head-up display, it changed from acrylic adhesive (OCA) 8172 made from 3M company of 50 micrometers thickness to the acrylic adhesive TD06A made from Yodogawa Paper Co., Ltd. of 10 micrometers thickness. In appearance evaluation, the cocoon skin was severe and the information on the liquid crystal panel could not be recognized correctly.

  The head-up display of the present invention can be used for vehicles such as automobiles and airplanes, and for game machines. Moreover, the half mirror material used for the head-up display of this invention can be used for a head mounted display.

DESCRIPTION OF SYMBOLS 10: Information projector 11: Transparent base material 12: Adhesive layer 13: Half mirror material 21: Transparent base material 22: Adhesive layer 23: Easy adhesion layer 24: Laminated film 25 which is a half mirror material: Display part 26: Luminance Broken line 27 indicating measurement position of distributed unevenness 27: Black point 28: Maximum value of luminance 29: Minimum value of luminance 30: Storage location of display unit 31: Notebook computer 32: Visual test table 33: Fluorescent lamp

Claims (16)

A head-up display comprising a projector for projecting information and a display unit on which the information is projected and made visible, wherein the display unit is a layer made of a transparent substrate, an adhesive layer, and a thermoplastic resin A (A Layer) and a layer made of thermoplastic resin B (B layer) are alternately laminated in the order of half mirror material, and the reflectance of the half mirror material is 13% or more and 70% or less. The head-up display is characterized in that the uneven luminance distribution of the part is 40% or less. The head-up display according to claim 1, wherein a polyethylene terephthalate film or a polyethylene naphthalate film is further disposed between the adhesive layer and the half mirror material. The head-up display according to claim 1, wherein an α relaxation temperature in the dynamic viscoelasticity measurement of the half mirror material is 85 ° C. or higher. The head-up according to any one of claims 1 to 3, wherein an easy-adhesion layer using an acrylic / urethane copolymer resin, two or more kinds of cross-linking agents and polythiophene as raw materials is provided on one side or both sides of the half mirror material. display. The head-up display according to any one of claims 1 to 4, wherein the waist strength of the half mirror material is 3N · (mm) ² or more. The head-up display according to any one of claims 1 to 5, wherein a peel-off number in 100 squares is 5 or less in a cross-cut test after the half mirror material is treated at 60 ° C, 90% humidity, and 72 hours. The head-up display according to any one of claims 1 to 6, wherein a thickness of an outermost thick film layer of the half mirror material is 5 µm or more. The head-up display according to any one of claims 1 to 7, wherein the transmittance of the half mirror material is 30% or more and 85% or less. The head-up display according to any one of claims 1 to 8, wherein the thermoplastic resin A constituting the half mirror material is polyethylene terephthalate or polyethylene naphthalate. The head-up display according to any one of claims 1 to 9, wherein the thermoplastic resin B constituting the half mirror material is a polyester using bisphenol A and cyclohexanedimethanol as all or part of a diol component. The head-up display according to claim 1, wherein the projector is a laser projector. The head-up display according to any one of claims 1 to 11, wherein the display unit includes a transparent base material, an adhesive layer, a half mirror material, an adhesive layer, and a transparent base material. The head-up display according to claim 1, wherein the display unit is movable. An automobile comprising the head-up display according to claim 1. An aircraft comprising the head-up display according to claim 1. A game machine comprising the head-up display according to claim 1.