US 12,219,288 B2
Reflective screen, reflective screen unit, and video display device
Sunao Yamaguchi, Tokyo (JP); and Masashi Hiromitsu, Tokyo (JP)
Appl. No. 17/906,266
Filed by Dai Nippon Printing Co., Ltd., Tokyo (JP)
PCT Filed Mar. 18, 2021, PCT No. PCT/JP2021/011136
§ 371(c)(1), (2) Date Dec. 14, 2022,
PCT Pub. No. WO2021/187570, PCT Pub. Date Sep. 23, 2021.
Claims priority of application No. 2020-047506 (JP), filed on Mar. 18, 2020.
Prior Publication US 2023/0130094 A1, Apr. 27, 2023
Int. Cl. G03B 21/602 (2014.01); G02B 3/08 (2006.01); H04N 5/74 (2006.01)
CPC H04N 5/7408 (2013.01) [G02B 3/08 (2013.01); G03B 21/602 (2013.01)] 6 Claims
OG exemplary drawing
 
1. A reflective screen which observably displays by reflecting video light projected from a video source, the reflective screen comprising:
a lens layer of Fresnel lens shape in which a plurality of unit lenses are arranged; and
a reflective layer which is formed on the unit lens of the lens layer, and reflects light,
wherein the unit lens is convex towards a back surface side from a video source side in a thickness direction of the lens layer,
wherein a flat part at which a back surface side becomes a flat surface is formed in at least an edge of the lens layer,
wherein, in a thickness direction of the lens layer, a largest lens height h1max of a lens height h1, which is a distance from a position that is a most video source side until a position that a most back surface side of the unit lens, and a flat surface height h2 which is a distance from a position which is a most video source side of the unit lens until the flat surface of the flat part satisfy a relationship h2≥h1max,
wherein the flat surface height h2 differs according to position of the flat part, and
wherein a smallest flat surface height h2 min of the flat surface height h2 satisfies a relationship h2min≥h1max.