WO2019031238A1 - ヘッドアップディスプレイ表示装置およびそれに用いる透光部材 - Google Patents
ヘッドアップディスプレイ表示装置およびそれに用いる透光部材 Download PDFInfo
- Publication number
- WO2019031238A1 WO2019031238A1 PCT/JP2018/027809 JP2018027809W WO2019031238A1 WO 2019031238 A1 WO2019031238 A1 WO 2019031238A1 JP 2018027809 W JP2018027809 W JP 2018027809W WO 2019031238 A1 WO2019031238 A1 WO 2019031238A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- light transmitting
- transmitting member
- light
- tungsten oxide
- composite tungsten
- Prior art date
Links
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- 239000002131 composite material Substances 0.000 claims abstract description 31
- QGLKJKCYBOYXKC-UHFFFAOYSA-N nonaoxidotritungsten Chemical compound O=[W]1(=O)O[W](=O)(=O)O[W](=O)(=O)O1 QGLKJKCYBOYXKC-UHFFFAOYSA-N 0.000 claims abstract description 31
- 229910001930 tungsten oxide Inorganic materials 0.000 claims abstract description 31
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- 229910052733 gallium Inorganic materials 0.000 claims description 3
- 229910052732 germanium Inorganic materials 0.000 claims description 3
- 229910052737 gold Inorganic materials 0.000 claims description 3
- 229910052735 hafnium Inorganic materials 0.000 claims description 3
- 229910052734 helium Inorganic materials 0.000 claims description 3
- 229910052739 hydrogen Inorganic materials 0.000 claims description 3
- 229910052738 indium Inorganic materials 0.000 claims description 3
- 229910052740 iodine Inorganic materials 0.000 claims description 3
- 229910052741 iridium Inorganic materials 0.000 claims description 3
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- 229910052745 lead Inorganic materials 0.000 claims description 3
- 229910052748 manganese Inorganic materials 0.000 claims description 3
- 229910052750 molybdenum Inorganic materials 0.000 claims description 3
- 229910052759 nickel Inorganic materials 0.000 claims description 3
- 229910052758 niobium Inorganic materials 0.000 claims description 3
- 229910052763 palladium Inorganic materials 0.000 claims description 3
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- 229910052702 rhenium Inorganic materials 0.000 claims description 3
- 229910052703 rhodium Inorganic materials 0.000 claims description 3
- 229910052707 ruthenium Inorganic materials 0.000 claims description 3
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- 229910052710 silicon Inorganic materials 0.000 claims description 3
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- 229910052718 tin Inorganic materials 0.000 claims description 3
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical group [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 claims description 3
- 239000010937 tungsten Substances 0.000 claims description 3
- 229910052720 vanadium Inorganic materials 0.000 claims description 3
- 229910052725 zinc Inorganic materials 0.000 claims description 3
- 229910052726 zirconium Inorganic materials 0.000 claims description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 2
- 229910052760 oxygen Inorganic materials 0.000 claims description 2
- 239000001301 oxygen Substances 0.000 claims description 2
- 229920005989 resin Polymers 0.000 abstract description 9
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- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 5
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- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
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- 125000002723 alicyclic group Chemical group 0.000 description 2
- IISBACLAFKSPIT-UHFFFAOYSA-N bisphenol A Chemical compound C=1C=C(O)C=CC=1C(C)(C)C1=CC=C(O)C=C1 IISBACLAFKSPIT-UHFFFAOYSA-N 0.000 description 2
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- ROORDVPLFPIABK-UHFFFAOYSA-N diphenyl carbonate Chemical compound C=1C=CC=CC=1OC(=O)OC1=CC=CC=C1 ROORDVPLFPIABK-UHFFFAOYSA-N 0.000 description 1
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Images
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/20—Filters
- G02B5/206—Filters comprising particles embedded in a solid matrix
-
- 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
- G02B27/0101—Head-up displays characterised by optical features
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60K35/00—Arrangement of adaptations of instruments
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/20—Filters
- G02B5/208—Filters for use with infrared or ultraviolet radiation, e.g. for separating visible light from infrared and/or ultraviolet radiation
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/20—Filters
- G02B5/22—Absorbing filters
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
- G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
- G02B5/3083—Birefringent or phase retarding elements
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2258—Oxides; Hydroxides of metals of tungsten
Definitions
- the present invention relates to a head-up display device and a translucent member used therefor.
- the head-up display device displays an image on a display such as a display and projects the image on glass or the like in the user's field of view.
- a display such as a display
- external light unsunlight
- heat rays infrared rays
- a reflection portion is provided in the light path from the display element to the windshield glass, and the reflection portion is an optical interference film that transmits infrared light but reflects visible light. It has been proposed to provide a coated cold mirror or to provide an infrared reflector in the light path that reflects infrared radiation but transmits visible light.
- Patent Document 2 a light-transmissive cover for preventing dust and dirt from entering from a projection port for projecting an image from a device body to a projection unit such as glass can have polarization characteristics. Proposed.
- Patent Document 2 when a general polarizing plate is attached to a polycarbonate plate in order to give a polarizing property to the cover, the heat causes the polycarbonate plate to bend, and a projected image is distorted or curled. There is a possibility that it may be detached from the case, and a structure in which a plurality of polarizing plates are laminated has been proposed.
- the first object of the present invention is to easily display an image projected from a display while suppressing the heat input from the sun to the display of the head-up display without using such an expensive member.
- An object of the present invention is to provide a translucent member, in particular, a translucent cover, which does not impair the brightness.
- a second object of the present invention is to provide a light transmitting member, in particular a light transmitting cover, capable of achieving not only the visibility with the naked eye but also the visibility through polarized sunglasses, in addition to the above problems.
- the 3rd subject of this invention is a translucent member which suppresses further heat input with respect to the increase in heat input accompanying the enlargement of a head-up display in recent years, and does not impair the brightness of the picture projected from a display.
- the present inventors are equal to a polarizing plate according to a specific light transmission member as a result of earnestly researching that the light transmission member itself used for a head-up display apparatus equips the shielding function of an infrared region with respect to the said subject.
- the inventors have found that an effect can be expressed, and reached the present invention.
- the inventors have found that by setting the in-plane retardation to a specific range, the visibility of both the naked eye and polarized sunglasses, which is the second problem, can be compatible, and the present invention has been achieved.
- the present invention relates to the following translucent members (1) to (7) and a head-up display device (8) using the same.
- a light transmitting member formed of a polycarbonate resin composition, having a thickness in the range of 0.2 to 0.6 mm, and containing a composite tungsten oxide particle as an infrared shielding agent in the light transmitting member
- Translucent member used for a head-up display device characterized in that the content of tungsten oxide particles: A (weight%) and the thickness of the layer containing the composite tungsten oxide particles: B (mm) satisfy the following equation .
- the composite tungsten oxide particles have a general formula MxWyOz (where M is H, He, alkali metal, alkaline earth metal, rare earth elements, Mg, Zr, Cr, Mn, Fe, Ru, Co, Rh, Ir) , Ni, Pd, Pt, Cu, Ag, Au, Zn, Cd, Al, Ga, In, Tl, Si, Ge, Sn, Pb, Sb, B, F, P, S, Se, Br, Te, Ti At least one element selected from Nb, V, Mo, Ta, Re, Be, Hf, Os, Bi, I, W is tungsten, O is oxygen, 0.1 ⁇ x ⁇ 0.5,
- the light transmitting member according to the above (1) which is a composite tungsten oxide particle represented by 0.5 ⁇ y ⁇ 1.5, 2.0 ⁇ z ⁇ 3.5).
- the light transmitting member according to the above (1) wherein the average light transmittance at a wavelength of 380 to 780 nm is 70% or more and the average transmittance at a wavelength of 700 to 2500 nm is 50% or less.
- the light transmitting member according to any one of (1) to (5) which is used for a light transmitting cover of a head-up display device.
- the light transmitting member according to (6) further provided with a polarization function.
- a head-up display device comprising: the light transmitting member according to any one of (1) to (7); and a display for outputting an image to the outside through the light transmitting member.
- the light transmitting member itself has the same light transmitting property as the polarizing plate and high heat ray shielding performance against heat input from the sun to the display device, the temperature rise of the head-up display device can be more easily suppressed. Furthermore, when the in-plane retardation is in a specific range, both the visibility of the naked eye and the polarized sunglasses can be compatible. In addition, since it is different from the means for shielding the heat rays up to now, such as the polarizing plate and the cold mirror, it can be used as a means for shielding further heat rays for coping with the enlargement of the head-up display device It can be used.
- the head-up display generally comprises a display (1) and a light transmitting member (2) as shown in FIG. 1, and the output image is projected on a projection surface (3) such as glass.
- the display apparatus can be disposed in a space separated by the housing (4) and the light transmitting member in order to suppress display abnormality due to dust or dirt and to reduce the influence of heat rays, and polarization is performed there It is a preferable aspect to arrange a plate, a mirror (such as a reflection plate or a cold mirror), and the like.
- the display (1) is a device for outputting a projected image in a head-up display device.
- a liquid crystal display LCD
- LCD liquid crystal display
- the light source used for the display is not particularly limited, but a light source with less irradiation of heat rays is preferable, and from such a point of view, organic EL and LED can be preferably exemplified.
- the light-transmissive member of the present invention is preferably disposed between the display (1) and the light-transmissive cover (2) and mounted on the housing (4).
- dust and dirt do not enter from the projection opening. It is preferable to use as a light transmission cover to be used.
- the light transmitting member of the present invention is a light transmitting member formed of a polycarbonate resin composition, and has a thickness of 0.2 to 0.6 mm containing composite tungsten oxide particles as an infrared shielding agent, and is a composite oxide Tungsten particle content: A (weight%) and thickness of layer containing composite tungsten oxide particles: B (mm) satisfy the following formula. 0.02 ⁇ A ⁇ B ⁇ 0.12 It has been found that by containing composite tungsten oxide particles of a specific concentration in such a thin member, it is possible to achieve both brightness and heat ray shielding equivalent to those of a polarizing plate.
- the luminance and the heat ray shielding can be highly provided.
- the product of the content (A) of the composite tungsten oxide particles and the thickness (B) of the light transmitting member is in the above range, the luminance and the heat ray shielding can be highly provided.
- the thickness of the light transmitting member is preferably in the range of 0.3 to 0.55 mm, more preferably 0.35 to 0.5 mm. When the thickness of the light transmitting member exceeds the upper limit, the haze tends to be high.
- the thickness is less than the lower limit, the content of the composite tungsten oxide particles is relatively increased, and dispersion failure easily occurs.
- the polycarbonate resin in the present invention can be produced, for example, by reacting dihydric phenol with a carbonate precursor.
- the dihydric phenol used herein is not particularly limited, but is bis (4-hydroxyphenyl) alkane from the viewpoint of transparency and the like, and bisphenol A is particularly preferable from the viewpoint of impact resistance.
- Carbonyl halides, carbonic acid diesters or haloformates are used as the carbonate precursor, and specific examples include phosgene, diphenyl carbonate, and dihaloformates of dihydric phenol.
- the polycarbonate resin of the present invention is a branched polycarbonate resin obtained by copolymerizing a trifunctional or higher polyfunctional aromatic compound, and a polyester carbonate resin obtained by copolymerizing an aromatic or aliphatic (including alicyclic) difunctional carboxylic acid And a copolymerized polycarbonate resin copolymerized with a difunctional alcohol (including an alicyclic group), and a polyester carbonate resin copolymerized together with such a difunctional carboxylic acid and a difunctional alcohol.
- the light transmitting member of the present invention is formed of a polycarbonate resin composition as described above, and the resin composition contains a polycarbonate resin and an infrared ray shielding agent, and if necessary, does not impair the object of the present invention Within the range, other additives and resins may be contained.
- the proportion of the polycarbonate-based resin in the polycarbonate-based resin composition is preferably 50% by weight or more, more preferably 70% by weight or more, and still more preferably 90% by weight or more, based on the weight of the resin composition.
- a resin other than a polycarbonate resin is used in combination with the polycarbonate resin composition in the present invention
- a resin having good compatibility with the polycarbonate resin is preferable from the viewpoint of the effect of the present invention. You may use resin.
- stabilizers and weathering agents are preferably mentioned.
- the viscosity average molecular weight of the polycarbonate resin is preferably 14,000 to 100,000, more preferably 20,000 to 30,000, still more preferably 22,000 to 28,000, and 23,000 to 26,000. Most preferred. If the molecular weight is too low beyond the above range, mechanical properties such as impact value become insufficient, and cracking tends to occur. In addition, when the molecular weight is high beyond the above range, injection molding becomes difficult, and a crack failure is likely to occur due to residual stress or the like. Furthermore, in the more preferable range, it is excellent in coexistence with impact resistance and moldability. In addition, the said polycarbonate resin may be obtained by mixing the thing whose viscosity average molecular weight is out of the said range.
- the viscosity average molecular weight (MV) of the polycarbonate resin is obtained by inserting the specific viscosity ( ⁇ sp) obtained at 20 ° C. from a solution of 0.7 g of polycarbonate resin dissolved in 100 ml of methylene chloride in the following equation.
- the composite tungsten oxide particles in the present invention are MxWyOz (where M is H, He, alkali metal, alkaline earth metal, rare earth element, Mg, Zr, Cr, Mn, Fe, Ru, Co, Rh, Ir, Ni) , Pd, Pt, Cu, Ag, Au, Zn, Cd, Al, Ga, In, Tl, Si, Ge, Sn, Pb, Sb, B, F, P, S, Se, Br, Te, Ti, Nb , V, Mo, Ta, Re, Be, Hf, Os, Bi, I.
- MxWyOz where M is H, He, alkali metal, alkaline earth metal, rare earth element, Mg, Zr, Cr, Mn, Fe, Ru, Co, Rh, Ir, Ni
- Pd, Pt Cu, Ag, Au, Zn, Cd, Al, Ga, In, Tl, Si, Ge, Sn, Pb, Sb, B, F, P, S, Se, Br, Te
- x, y, z are 0.01 ⁇ x ⁇ 1, 0.001 ⁇ x / y ⁇ It is preferable that it is a particle
- M is preferably an element selected from the group consisting of Li, Na, K, Rb, Cs, Mg, Ca, Sr and Ba, and most preferably K, Rb or Cs.
- the range of x is preferably 0.01 ⁇ x ⁇ 0.5, and more preferably 0.2 ⁇ x ⁇ 0.4.
- the range of x / y and z / y is preferably 0.01 ⁇ x / y ⁇ 0.5 and 2.7 ⁇ z / y ⁇ 3.0, respectively, and 0.2 ⁇ x / y ⁇ 0.4.
- 2.8 ⁇ z / y ⁇ 3.0 are more preferable.
- the composite tungsten oxide particles can be obtained by heat treatment of the starting tungsten compound in an inert gas atmosphere or a reducing gas atmosphere.
- the composite tungsten oxide particles obtained through the heat treatment have sufficient near infrared shielding power and have preferable properties as infrared shielding fine particles.
- the particle diameter of the composite tungsten oxide particles is preferably 1 nm to 800 nm, more preferably 1 nm to 600 nm, and still more preferably 1 nm to 300 nm.
- the particle diameter is smaller than 1 nm, the aggregation effect is increased to cause poor dispersibility, and when the particle diameter is larger than the upper limit, defects such as high haze of the transparent resin molded product may occur.
- a method of dispersing composite tungsten oxide particles in polycarbonate resin As a method of dispersing composite tungsten oxide particles in polycarbonate resin, a method of directly adding composite tungsten oxide particles or composite tungsten oxide particles coated on the surface, or making a master diluted with 1 to 100 times polycarbonate resin is prepared. The method of adding after that is mentioned. When compounding polycarbonate resin and composite tungsten oxide particles, a heat stabilizer, a weathering agent, etc. may be added.
- the light-transmissive member of the present invention preferably has an average light transmittance of 70% or more at a wavelength of 380 to 780 nm and 50% or less of an average transmittance of 700 to 2500 nm, and has an average light transmittance of 380 to 780 nm. More preferably, the average transmittance at 75% or more and at a wavelength of 700 nm to 2500 nm is at most 30%.
- the average light transmittance at a wavelength of 380 to 780 nm is less than 70%, the decrease in luminance is large, and when the average transmittance at a wavelength of 700 nm to 2500 nm exceeds 50%, the heat ray shielding effect is small.
- the light transmitting member of the present invention may have a single layer structure or a multilayer structure.
- at least one of the layers is formed of a polycarbonate resin composition, and examples thereof include a layer formed of a polycarbonate resin composition and a layer of an acrylic resin laminated.
- the translucent member of the present invention may be coated on part or all of one side or both sides.
- the pencil hardness of the light-transmissive member of the present invention is preferably, for example, pencil hardness B or more, and more preferably HB or more so as not to be scratched even when wiped for cleaning.
- those provided with a hard coat layer coated with a hard coat agent can be preferably mentioned, and as the hard coat agent, those known per se can be suitably used.
- specific examples of commercially available hard coating agents include Beam Set 575 manufactured by Arakawa Chemical Industries, Ltd. and U15 HA manufactured by Shin-Nakamura Chemical Co., Ltd.
- a reflective portion is provided in the light path from the display element to the windshield glass in order to prevent the penetration of heat rays (infrared rays).
- a cold mirror coated with an optical interference film that transmits infrared light but reflects visible light may be provided in the part, or an infrared reflecting plate that reflects infrared light but transmits visible light may be provided in the light path.
- a polarizer may be disposed in the light path to prevent the penetration of heat rays without compromising the brightness of the display.
- the retardation of the light transmitting member of the present invention and the direction of the slow axis have less variation.
- the in-plane phase of the light-transmissive member of the present invention is preferably 100 nm or less, more preferably 75 nm or less, and still more preferably 50 nm or less.
- the phase difference is high, the luminance is likely to be affected unless it is used in consideration of the direction of the slow axis of the light transmitting member.
- the feature of the present invention is that the visibility of the naked eye is highly balanced while shielding infrared rays by the composite tungsten oxide particles.
- the in-plane retardation can be highly balanced in the visibility of both polarized eyes as well as the naked eye by being in a specific range.
- the lower limit of the in-plane phase of the light-transmissive member is preferably 20 nm, more preferably 35 nm, and still more preferably 60 nm. If the in-plane retardation is less than the lower limit, it is difficult to obtain luminance when passing through polarized sunglasses.
- the upper limit of the in-plane retardation of the light-transmitting member in consideration of the visibility of polarized sunglasses is preferably 170 nm, more preferably 160 nm, still more preferably 140 nm, particularly preferably 100 nm. When the in-plane retardation exceeds the upper limit, the luminance when passing through the polarizing sunglasses is increased, but the luminance is largely changed when the direction of the slow axis of the light transmitting member is slightly changed.
- Example 1 L-1250 manufactured by Teijin Limited was used as a polycarbonate resin, and YMDS-874 manufactured by Sumitomo Metal Mining Co., Ltd. (composite tungsten oxide particle concentration: about 23% by weight) was used as an infrared shielding agent.
- the polycarbonate resin and the infrared shielding agent were entirely mixed by a blender such that the compounding amount of the composite tungsten oxide particles became a ratio described in Table 1 and Table 2, and melt kneading was performed.
- a vent type twin screw extruder manufactured by Japan Steel Works, Ltd .: TEX30 ⁇ (complete meshing, corotational, double thread screw) is used, and the kneading zone is one type in front of the vent port.
- the extrusion conditions were a discharge amount of 20 kg / h, a screw rotation speed of 150 rpm, and a degree of vacuum of 3 kPa for the vent, and the extrusion temperature was 280 ° C. from the first supply port to the die portion.
- the production of the above-mentioned resin composition was carried out in an atmosphere where clean air circulated through the HEPA filter was circulated, and it was carried out with great care so as to prevent the entry of foreign matter at the time of operation.
- Test strip preparation The resulting pellets are dried at 110 to 120 ° C. for 6 hours in a hot air circulating drier, and then extruded at 280 ° C. using a film forming apparatus (KZW15TW-30MG-NH, FPU15-240 manufactured by Technobel Co., Ltd.). An evaluation test piece having a thickness of 0.4 mm was produced under the condition of a cooling roll temperature of 148 ° C.
- Example 2 to 5 and Comparative Examples 1 to 2 Examples 2 to 5 and Comparative Examples 1 to 2 were carried out in the same manner as Example 1, except that they were changed as shown in Tables 1 and 2.
- Comparative Example 3 A test piece containing no composite tungsten oxide particles was produced in the same manner as in Example 1 and evaluated in the same manner as in Example 1.
- Comparative Example 4 The polarizing plate used for the on-vehicle head-up display translucent cover was cut out from a real vehicle and evaluated in the same manner as in Example 1. However, regarding the average transmittance (380 to 780 nm), the transmittance in the transmission axis direction was measured at a pitch of 5 nm using VAP-7070 manufactured by JASCO Corporation, and the average value was calculated. The above evaluation was carried out and the evaluation results of Comparative Examples 3 to 4 are shown in Table 3.
- the light transmitting members obtained in Examples 1 to 5 have high light transmitting property and high heat ray shielding performance against heat input from the sun to the display device.
- Comparative Example 2 in which A ⁇ B deviates from the claimed range the temperature rise is high and the heat ray shielding performance is high. It is inferior.
- Comparative Example 3 in which the composite tungsten oxide particles are not contained, the temperature rise is high and the heat ray shielding performance is inferior, and in Comparative Example 4 using the polarizing plate used for the commercially available on-vehicle head-up display translucent cover Although it has a heat ray shielding performance, it is inferior in translucency.
- Example 6 to 9 A test piece was prepared by repeating the same operation as in Example 1, except that a touch roll was provided on the side not in contact with the cooling roll of the sheet and the pressure was adjusted to achieve the in-plane retardation shown in Table 4.
- the obtained test piece was evaluated by the structure of FIG. 2 used for evaluation of the brightness.
- the test piece (2) was adjusted by rotating the test piece (2) so that characters appearing reflected on the glass (3) would appear brightest. From the position, the test piece (2) was rotated to change the direction of the slow axis 360 degrees, and the change in brightness was visually confirmed, and the change in brightness (naked eye) with reference to Example 7 was small. ⁇ , those with many changes were marked x.
- the above-mentioned luminance meter may be used as a visual index.
- the evaluation results of Examples 6 to 9 are shown in Table 4.
- Example 10 to 15 A touch roll is provided on the side not in contact with the cooling roll of the sheet, and a UV curable hard coat layer is provided on both sides of the sheet with a thickness of 5 ⁇ m, respectively.
- the above operation was repeated to create a test piece.
- the obtained test piece was evaluated by the structure of FIG. 2 used for evaluation of the brightness.
- the test piece (2) was adjusted by rotating the test piece (2) so that characters appearing reflected on the glass (3) would appear brightest. From the position, the test piece (2) was rotated to change the direction of the slow axis 360 degrees, and the change in brightness was visually confirmed, and the change in brightness (naked eye) with reference to Example 7 was small. ⁇ , those with many changes were marked x.
- the above-mentioned luminance meter may be used as a visual index. Moreover, the thing with few changes of luminance (polarization sunglasses) on the basis of Example 11 was made into (circle) and the thing with many changes was x. The evaluation results of Examples 10 to 15 are shown in Table 5.
- the light transmitting member of the present invention has high light transmitting property to the light from the head-up display equivalent to the polarizing plate to the windshield and high heat ray shielding performance to the heat input from the sun to the display. Since it has, it can be used for a head-up display and is useful.
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Abstract
Description
さらに、面内位相差を特定の範囲にすることで第二の課題である裸眼と偏光サングラスの両方の視認性を両立できることを見出し、本発明に到達した。
(1)ポリカーボネート系樹脂組成物より形成される透光部材であって、厚みが0.2~0.6mmの範囲であり、透光部材に赤外線遮蔽剤として複合酸化タングステン粒子を含有し、複合酸化タングステン粒子含有量:A(重量%)と複合酸化タングステン粒子が含有されている層の厚み:B(mm)が以下の式を満足することを特徴とするヘッドアップディスプレイ装置に用いる透光部材。
0.02≦A×B≦0.12 (1)
(2)複合酸化タングステン粒子が、一般式MxWyOz(但し、Mは、H、He、アルカリ金属、アルカリ土類金属、希土類元素、Mg、Zr、Cr、Mn、Fe、Ru、Co、Rh、Ir、Ni、Pd、Pt、Cu、Ag、Au、Zn、Cd、Al、Ga、In、Tl、Si、Ge、Sn、Pb、Sb、B、F、P、S、Se、Br、Te、Ti、Nb、V、Mo、Ta、Re、Be、Hf、Os、Bi、Iのうちから選択される1種類以上の元素、Wはタングステン、Oは酸素、0.1≦x≦0.5、0.5≦y≦1.5、2.0≦z≦3.5)で表記される複合酸化タングステン粒子である前記(1)記載の透
光部材。
(3)波長380~780nmの平均光線透過率が70%以上で、かつ波長700~2500nmの平均透過率が50%以下である前記(1)記載の透光部材。
(4)面内位相差が20~170nmの範囲である前記1~3に記載の透光部材。
(5)面内位相差が100nm以下の範囲である前記1~3に記載の透光部材。
(6)ヘッドアップディスプレイ装置の透光カバーに用いる前記(1)~(5)記載の透光部材。
(7)偏光機能をさらに付与した前記(6)記載の透光部材。
(8)前記(1)~(7)に記載の透光部材と、該透光部材を通して、画像を外部へ出力する表示器とを備えるヘッドアップディスプレイ装置。
本発明の透光部材は、ポリカーボネート系樹脂組成物より形成される透光部材であって、赤外線遮蔽剤として複合酸化タングステン粒子を含有させた厚みが0.2~0.6mmであり、複合酸化タングステン粒子含有量:A(重量%)と複合酸化タングステン粒子が含有されている層の厚み:B(mm)が以下の式を満足することを特徴とする部材である。
0.02≦A×B≦0.12
このような薄い部材に特定濃度の複合酸化タングステン粒子を含有させることで、偏光板と同等の輝度と熱線遮蔽とを両立できることを見出したのである。
また、本発明におけるポリカーボネート系樹脂組成物に添加するその他の添加剤としては、安定剤や耐候剤が好ましく挙げられる。
ηsp/c=[η]+0.45×[η]2 c(但し[η]は極限粘度)
[η]=1.23×10-4 MV 0.83
c=0.7
ポリカーボネート系樹脂と複合酸化タングステン粒子をコンパウンドする際は、熱安定剤、耐候剤等を添加しても良い。
具体的な市販のハードコート剤としては、荒川化学工業社製ビームセット575、新中村化学工業社製U15HA等が挙げられる。
以下に実施例をあげて本発明をさらに具体的に説明する。
ポリカーボネート樹脂として帝人株式会社製L-1250を、赤外線遮蔽剤として住友金属鉱山株式会社製YMDS-874(複合酸化タングステン粒子濃度約23重量%)を使用した。ポリカーボネート樹脂と赤外線遮蔽剤は複合酸化タングステン粒子の配合量が表1、表2記載の割合となるようブレンダーによる全体の混合を行い、溶融混錬を行った。溶融混練にはベント式二軸押出機機(株)日本製鋼所製:TEX30α(完全かみ合い、同方向回転、2条ネジスクリュー)を使用し、混練ゾーンはベント口手前に1箇所のタイプとした。押出条件は吐出量20kg/h、スクリュー回転数150rpm、ベントの真空度3kPaであり、また押出温度は第1供給口からダイス部分まで280℃とした。尚、上記の樹脂組成物の製造はHEPAフィルターを通した清浄な空気が循環する雰囲気において実施し、また作業時に異物の混入がないよう十分に注意して行った。
得られたペレットを110~120℃で6時間熱風循環式乾燥機にて乾燥した後、製膜装置[株式会社テクノベル製KZW15TW-30MG-NH、FPU15-240]を用いて、押出温度280℃、冷却ロール温度148℃の条件で厚み0.4mmの評価用試験片を作成した。
実施例2~5および比較例1~2は、表1及び表2に示す通り変更した以外は、実施例1と同様にして実施した。
(1)輝度
試験片より50mm角を切り出し、図2のように光源(1)、偏光板(7)、試験片(2)、ガラス(3)を配置した。試験片(2)はガラス(3)に反射して見える文字が最も明るく見えるよう試験片(2)を回転させて調整した。ガラスに反射して見える文字を目視で確認した。なお、輝度計(TOPCON社製、BM-7)にて確認してもよい。比較例4の偏光板よりも明るく視認性の良いものを〇、暗いものを×、同等のものを△として評価した。
そして、上記評価をガラスと輝度計の間に偏光板を配置しなかった結果を裸眼評価、配置したものを偏光サングラス評価とした。
(2)温度上昇
試験片より50×100mmを切り出し、晴れた日の屋外で棒状温度計測温部の約50mm上方に太陽光を遮るにように試験片を配置した。なお棒状温度計本体からの伝熱を防ぐ為、棒状温度計の太陽光が試験片で遮られていない部分は日陰となるように配慮した。評価は実施例3を基準として、それよりも温度の低いものを〇、温度の高いものを×、同等のものを△とした。
(3)平均透過率(380~780nm)
日本電色工業株式会社製SH-7000を用いてJIS K7361に従い測定した。
(4)平均透過率(700~2500nm)
VARIAN製CARY5000により波長5nmピッチ、スキャンレート600nm/minにて分光光線透過率を測定し、700~2500nmの値の平均値を計算により求めた。
(5)面内位相差
王子計測機器製KOBRA21SDHを用いて試験片の面内位相差を測定した。
実施例1と同様の方法にて複合酸化タングステン粒子を含まない試験片を作成し、実施例1と同様の方法で評価した。
車載ヘッドアップディスプレイ透光カバーに使用されている偏光板を実車より切り出し、実施例1と同様の方法で評価した。但し平均透過率(380~780nm)については日本分光株式会社製VAP-7070を用いて透過軸方向の透過率を5nmピッチで測定し、計算により平均値を算出した。
以上の評価を行い比較例3~4の評価結果を表3に示した。
シートの冷却ロールと接していない側にタッチロールを設け表4に示す面内位相差になるよう圧力を調整した他は実施例1と同様な操作を繰り返して試験片を作成した。
得られた試験片は、輝度の評価に用いた図2の構成で評価した。試験片(2)はガラス(3)に反射して見える文字が最も明るく見えるよう試験片(2)を回転させて調整した。その位置から試験片(2)を回転し遅相軸の向きを360度変化させた時の輝度の変化を目視にて確認し、実施例7を基準として輝度(裸眼)の変化の少ないものを〇、変化の多いものを×とした。なお、目視の指標として、前述の輝度計を用いても良い。
実施例6~9の評価結果を表4に示した。
シートの冷却ロールと接していない側にタッチロールを設け、シートの両面にUV硬化型ハードコート層をそれぞれ5μmの厚みで設け、表5に示す面内位相差とした他は実施例1と同様な操作を繰り返して試験片を作成した。
得られた試験片は、輝度の評価に用いた図2の構成で評価した。試験片(2)はガラス(3)に反射して見える文字が最も明るく見えるよう試験片(2)を回転させて調整した。その位置から試験片(2)を回転し遅相軸の向きを360度変化させた時の輝度の変化を目視にて確認し、実施例7を基準として輝度(裸眼)の変化の少ないものを〇、変化の多いものを×とした。なお、目視の指標として、前述の輝度計を用いても良い。
また、実施例11を基準として輝度(偏光サングラス)の変化の少ないものを○、変化の多いものを×とした。
実施例10~15の評価結果を表5に示した。
(2)透光部材(試験片)
(3)投影面(ガラス板(文字が観察者に見易いよう角度を調整))
(4)筐体
(5)偏光板(吸収軸方向:図示)
Claims (8)
- ポリカーボネート系樹脂組成物より形成される透光部材であって、厚みが0.2~0.6mmの範囲であり、透光部材に赤外線遮蔽剤として複合酸化タングステン粒子を含有し、複合酸化タングステン粒子含有量:A(重量%)と複合酸化タングステン粒子が含有されている層の厚み:B(mm)が以下の式を満足することを特徴とするヘッドアップディスプレイ装置に用いる透光部材。
0.02≦A×B≦0.12 (1) - 複合酸化タングステン粒子が一般式MxWyOz(但し、Mは、H、He、アルカリ金属、アルカリ土類金属、希土類元素、Mg、Zr、Cr、Mn、Fe、Ru、Co、Rh、Ir、Ni、Pd、Pt、Cu、Ag、Au、Zn、Cd、Al、Ga、In、Tl、Si、Ge、Sn、Pb、Sb、B、F、P、S、Se、Br、Te、Ti、Nb、V、Mo、Ta、Re、Be、Hf、Os、Bi、Iのうちから選択される1種類以上の元素、Wはタングステン、Oは酸素、0.1≦x≦0.5、0.5≦y≦1.5、2.0≦z≦3.5)で表記される複合酸化タングステン粒子である請求項1記載の透光部材。
- 波長380~780nmの平均光線透過率が70%以上で、かつ波長700~2500nmの平均透過率が50%以下である請求項1記載の透光部材。
- 面内位相差が20~170nmの範囲である請求項1~3に記載の透光部材。
- 面内位相差が100nm以下の範囲である前記1~3に記載の透光部材。
- ヘッドアップディスプレイ装置の透光カバーに用いる請求項1~5記載の透光部材。
- 偏光機能をさらに付与した請求項6記載の透光部材。
- 請求項1~7に記載の透光部材と、該透光部材を通して、画像を外部へ出力する表示器とを備えるヘッドアップディスプレイ装置。
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US16/635,651 US20210124169A1 (en) | 2017-08-09 | 2018-07-25 | Head-up display device and light-transmissive member used therefor |
CN201880051646.9A CN110998414A (zh) | 2017-08-09 | 2018-07-25 | 平视显示器显示装置和用于该平视显示器显示装置的透光部件 |
EP18845006.8A EP3667397B1 (en) | 2017-08-09 | 2018-07-25 | Head-up display device and light-transmissive member used therefor |
KR1020207006476A KR20200030613A (ko) | 2017-08-09 | 2018-07-25 | 헤드업 디스플레이 표시 장치 및 그것에 사용하는 투광 부재 |
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- 2018-07-25 JP JP2019535087A patent/JP6854897B2/ja active Active
- 2018-07-25 CN CN201880051646.9A patent/CN110998414A/zh active Pending
- 2018-07-25 KR KR1020207006476A patent/KR20200030613A/ko active IP Right Grant
- 2018-07-25 WO PCT/JP2018/027809 patent/WO2019031238A1/ja unknown
- 2018-07-25 EP EP18845006.8A patent/EP3667397B1/en active Active
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Also Published As
Publication number | Publication date |
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EP3667397A1 (en) | 2020-06-17 |
CN110998414A (zh) | 2020-04-10 |
EP3667397A4 (en) | 2020-10-28 |
EP3667397B1 (en) | 2023-11-29 |
KR20200030613A (ko) | 2020-03-20 |
JP6854897B2 (ja) | 2021-04-07 |
US20210124169A1 (en) | 2021-04-29 |
JPWO2019031238A1 (ja) | 2020-07-27 |
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