Sheet-form transparent molding, transparent screen comprising same, and image projection device comprising same
View Patent ↗Provided is a sheet-form transparent molding for use for a transparent screen, satisfying both visibilities of a projected light and a transmitted light by anisotropically scattering and reflecting the projected light emitted from a light source. A sheet-form transparent molding according to the present invention comprises a transparent light scattering layer comprising a resin and bright flake-form microparticles.
1. A reflection type transparent screen comprising:
a sheet-form transparent molding;
a transparent light scattering layer; and
a resin and bright flake-form microparticles,
wherein a content of the bright flake-form microparticles is from 0.0001 to 1.0% by mass based on the resin,
an average diameter of primary particles of the bright flake-form microparticles is from 0.1 to 30 μm and an average aspect ratio of the bright flake-form microparticles is from 10 to 800,
the bright flake-form microparticles are metallic particles selected from the group consisting of aluminum, silver, copper, platinum, gold, titanium, nickel, tin, indium and chromium, or a bright material of glass coated with those metals,
a total light transmittance of the sheet-form transparent molding is 70% or higher, a haze value of the sheet-form transparent molding is from 1% to 15% or less, and an image clarity of the sheet-form transparent molding is 70% or higher.
2. The reflection type transparent screen according to claim 1 , wherein
a regular reflectance of the bright flake-form microparticles is 12% or higher.
3. The reflection type transparent screen according to claim 1 , wherein
the transparent light scattering layer further comprises substantially spherical microparticles.
4. The reflection type transparent screen according to claim 3 , wherein
a difference between a refractive index n 2 of the substantially spherical microparticles and a refractive index n 1 of the resin satisfies the following formula (1):
| n 1 −n 2 |≥0.1 (1),
a median diameter of primary particles of the substantially spherical microparticles is from 0.1 to 500 nm,
the content of the substantially spherical microparticles is from 0.0001 to 2.0% by mass based on the resin.
5. The reflection type transparent screen according to claim 3 , wherein
the substantially spherical microparticles are at least one selected from the group consisting of zirconium oxide, zinc oxide, titanium oxide, cerium oxide, barium titanate, strontium titanate, magnesium oxide, calcium carbonate, barium sulfate, diamond, a cross-linked acrylic resin, a cross-linked styrene resin, and silica.
6. The reflection type transparent screen according to claim 1 , further comprising a transparent reflection layer having a refractive index n 3 , larger than a refractive index n 1 of the resin, on one face of the reflection type transparent screen.
7. The reflection type transparent screen according to claim 6 , wherein
the refractive index n 3 of the transparent reflection layer is 1.8 or higher,
an optical film thickness represented by the product of the refractive index n 3 and film thickness d of the transparent reflection layer is from 20 to 400 nm.
8. The reflection type transparent screen according to claim 1 , wherein
the transparent reflection layer comprises at least one selected from the group consisting of titanium oxide, niobium oxide, cerium oxide, zirconium oxide, indium tin oxide, zinc oxide, tantalum oxide, zinc sulfide, and tin oxide.
9. A laminated body comprising the reflection type transparent screen according to claim 1 .
10. A member for a vehicle, comprising the reflection type transparent screen according to claim 1 .
11. A member for a house, comprising the reflection type transparent screen according to claim 1 .
12. An image projection device, comprising the reflection type transparent screen according to claim 1 , and a projection device.