Back to results
US 5,477,380 AGranted
Projection screen
AssigneeDai Nippon Printing Co., Ltd.
InventorsHitomu Watanabe, Akira Izawa, Makoto Honda, Satoshi Nakamae, Hiroshi Kojima
Life of this patent
Estimating the term…
Abstract
A projection screen comprises a horizontal refracting linear Fresnel lens sheet, a vertical refracting linear Fresnel lens sheet and a light diffusing lenticular lens sheet, which are arranged from the beam-projection side starting with the horizontal refracting linear Fresnel lens sheet followed by the vertical refracting linear Fresnel lens sheet and ending with the light diffusing lenticular lens sheet.
Claims22
A projection screen for rear-projection TV sets characterized in that said projection screen comprises three or more screen sheets:
- a horizontal refracting linear Fresnel lens sheet for refracting a projection beam mainly in a horizontal direction wherein a ridge line of said horizontal refracting linear Fresnel lens sheet extends in a vertical direction, a vertical refracting linear Fresnel lens sheet for refracting a projection beam mainly in said vertical direction wherein a ridge line of said vertical refracting linear Fresnel lens sheet extends in said horizontal direction, and a light diffusing lenticular lens sheet, which are arranged starting from a beam-projection side, with said horizontal refracting linear Fresnel lens sheet followed by said vertical refracting linear Fresnel lens sheet and ending with said light diffusing lenticular lens sheet, wherein at least one of said horizontal refracting linear Fresnel lens sheet and said vertical refracting linear Fresnel lens sheet is made of ultraviolet-beam hardened resin.
A projection screen for rear-projection TV sets characterized in that said projection screen comprises three or more screen sheets:
- a horizontal refracting linear Fresnel lens sheet for refracting a projection beam mainly in a horizontal direction wherein a ridge line of said horizontal refracting linear Fresnel lens sheet extends in a vertical direction, a vertical refracting linear Fresnel lens sheet for refracting a projection beam mainly in said vertical direction wherein a ridge line of said vertical refracting linear Fresnel lens sheet extends in said horizontal direction., and a light diffusing lenticular lens sheet, which are arranged starting from a beam-projection side with said horizontal refracting linear Fresnel lens sheet followed by said vertical refracting linear Fresnel lens sheet and ending with said light diffusing lenticular lens sheet, wherein a fourth sheet is placed on a side closest to a watcher in order to increase mechanical strength of said three sheets.
A projection screen for rear-projection TV sets characterized in that said projection screen comprises three or more screen sheets:
- a horizontal refracting linear Fresnel lens sheet for refracting a projection beam mainly in a horizontal direction wherein a ridge line of said horizontal refracting linear Fresnel lens sheet extends in a vertical direction, a vertical refracting linear Fresnel lens sheet for refracting a projection beam mainly in said vertical direction wherein a ridge line of said vertical refracting linear Fresnel lens sheet extends in said horizontal direction, and a light diffusing lenticular lens sheet, which are arranged starting from a beam-projection side with said horizontal refracting linear Fresnel lens sheet followed by said vertical refracting linear Fresnel lens sheet and ending with said light diffusing lenticular lens sheet, wherein a refraction index of said horizontal refracting linear Fresnel lens sheet is made greater than a refraction index of said vertical refracting linear Fresnel lens sheet.
A projection screen for rear-projection TV sets characterized in that said projection screen comprises three or more screen sheets:
- a horizontal refracting linear Fresnel lens sheet for refracting a projection beam mainly in a horizontal direction wherein a ridge line of said horizontal refracting linear Fresnel lens sheet extends in a vertical direction, a vertical refracting linear Fresnel lens sheet for refracting a projection beam mainly in said vertical direction wherein a ridge line of said vertical refracting linear Fresnel lens sheet extends in said horizontal direction, and a light diffusing lenticular lens sheets which are arranged starting from a beam-projection side with said horizontal refracting linear Fresnel lens sheet followed by said vertical refracting linear Fresnel lens sheet and ending with said light diffusing lenticular lens sheet, wherein a focal distance of said horizontal refracting linear Fresnel lens sheet is made greater than a focal distance of said vertical refracting linear Fresnel lens sheet.
A projection screen for rear-projection TV sets characterized in that said projection screen comprises three or more screen sheets:
- a horizontal refracting linear Fresnel lens sheet for refracting a projection beam mainly in a horizontal direction wherein a ridge line of said horizontal refracting linear Fresnel lens sheet extends in a vertical direction, a vertical refracting linear Fresnel lens sheet for refracting a projection beam mainly in said vertical direction wherein a ridge line of said vertical refracting linear Fresnel lens sheet extends in said horizontal direction, and a light diffusing lenticular lens sheet, which are arranged starting from a beam-projection side with said horizontal refracting linear Fresnel lens sheet followed by said vertical refracting linear Fresnel lens sheet and ending with said light diffusing lenticular lens sheet, wherein focal distances of said horizontal refracting linear Fresnel lens sheet and said vertical refracting linear Fresnel lens sheet are set at such values that, the greater the distance from a point to a center axis of a lens, the greater said focal distance for said point.
A projection screen for rear-projection TV sets characterized in that said projection screen comprises three or more screen sheets:
- a horizontal refracting linear Fresnel lens sheet for refracting a projection beam mainly in a horizontal direction wherein a ridge line of said horizontal refracting linear Fresnel lens sheet extends in a vertical direction, a vertical refracting linear Fresnel lens sheet for refracting a projection beam mainly in said vertical direction wherein a ridge line of said vertical refracting linear Fresnel lens sheet extends in said horizontal direction, and a light diffusing lenticular lens sheet, which are arranged starting from a beam-projection side with said horizontal refracting linear Fresnel lens sheet followed by said vertical refracting linear Fresnel lens sheet and ending with said light diffusing lenticular lens sheet, wherein a light diffusing means is provided on said vertical refracting linear Fresnel lens sheet.
A projection screen for rear-projection TV sets characterized in that said projection screen comprises three or more screen sheets:
- a horizontal refracting linear Fresnel lens sheet for refracting a projection beam mainly in a horizontal direction wherein a ridge line of said horizontal refracting linear Fresnel lens sheet extends in a vertical direction, a vertical refracting linear Fresnel lens sheet for refracting a projection beam mainly in said vertical direction wherein a ridge line of said vertical refracting linear Fresnel lens sheet extends in said horizontal direction, and a light diffusing lenticular lens sheet, which are arranged starting from a beam-projection side with said horizontal refracting linear Fresnel lens sheet followed by said vertical refracting linear Fresnel lens sheet and ending with said light diffusing lenticular lens sheet, wherein vertical-direction diffusion angles are set at such values that, the greater the distance from a point to a center of said projection screen, the greater said vertical-direction diffusion angle at said point.
Dependencies are inferred from the claim text.