US 12,242,179 B2
Reflective screen, reflective screen unit, and video display device
Sunao Yamaguchi, Tokyo (JP); and Masashi Hiromitsu, Tokyo (JP)
Assigned to Dai Nippon Printing Co., Ltd., Tokyo (JP)
Appl. No. 17/906,264
Filed by Dai Nippon Printing Co., Ltd., Tokyo (JP)
PCT Filed Mar. 26, 2021, PCT No. PCT/JP2021/012931
§ 371(c)(1), (2) Date Mar. 30, 2023,
PCT Pub. No. WO2021/205907, PCT Pub. Date Oct. 14, 2021.
Claims priority of application No. 2020-068852 (JP), filed on Apr. 7, 2020.
Prior Publication US 2023/0266655 A1, Aug. 24, 2023
Int. Cl. G03B 21/602 (2014.01)
CPC G03B 21/602 (2013.01) 9 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 having a 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 part of a back surface side becomes a flat surface is formed in at least an edge of the lens layer, and
wherein, in a thickness direction of the lens layer, a smallest lens height h1min of a lens height h1, which is a distance from a position that is a most video source side of the lens layer until a position that a most back surface side of the unit lens, and a height h2 which is a distance from the flat surface of the flat part until a position which is a most back surface side of the unit lens satisfy a relationship (h1min−h2)>0.