US 12,353,092 B2
Diffusing member, manufacturing method of diffusing member, planar light source device, display device, and dielectric multilayer film
Marii Nishikawa, Tokyo-to (JP); Yasuyuki Oyagi, Tokyo-to (JP); Yukio Taniguchi, Tokyo-to (JP); and Masahiro Goto, Tokyo-to (JP)
Assigned to DAI NIPPON PRINTING CO., LTD., Tokyo (JP)
Appl. No. 17/916,319
Filed by DAI NIPPON PRINTING CO., LTD., Tokyo-to (JP)
PCT Filed Mar. 31, 2021, PCT No. PCT/JP2021/014012
§ 371(c)(1), (2) Date Sep. 30, 2022,
PCT Pub. No. WO2021/201164, PCT Pub. Date Oct. 7, 2021.
Claims priority of application No. 2020-063498 (JP), filed on Mar. 31, 2020; application No. 2020-176216 (JP), filed on Oct. 20, 2020; and application No. 2020-217710 (JP), filed on Dec. 25, 2020.
Prior Publication US 2023/0152626 A1, May 18, 2023
Int. Cl. G02F 1/1335 (2006.01); F21Y 113/13 (2016.01)
CPC G02F 1/133607 (2021.01) [G02F 1/133507 (2021.01); G02F 1/133526 (2013.01); F21Y 2113/13 (2016.08)] 5 Claims
OG exemplary drawing
 
1. A diffusing member comprising:
a light diffusing portion including unit optical elements, wherein:
each of the unit optical elements includes a convex portion or concave portion that has a shape of a triangular pyramid of which a bottom face is an isosceles right triangle,
the bottom face includes a base facing a vertex forming a right angle of the isosceles right triangle,
a pair of the unit optical elements is arrayed such that the bases of the pair of the unit optical elements are overlapped,
a plurality of pairs of the unit optical elements are arranged in a first direction and a second direction,
the unit optical elements are arrayed such that:
an orientation of the overlapped bases of a first pair of the unit optical elements is different from an orientation of the overlapped bases of a second pair of the unit optical elements, and
the bottom faces of the unit optical elements are arrayed in four orientations, and
an in-plane distribution of radiant intensity of light that enters the diffusing member is uniform.