公开(公告)号：US11592605B2

公开(公告)日：2023-02-28

申请号：US16723107

申请日：2019-12-20

Applicant: TOPPAN PRINTING CO., LTD.

Inventor： Kaoru Furuta ,  Hiroyuki Michi ,  Masashi Kawashita

IPC: B42D25/324 ,  B42D25/373 ,  G02B5/28 ,  G02B1/11 ,  G02B5/18 ,  B32B7/023 ,  B41M1/10 ,  B41M3/14

Abstract: A color developing structure that exhibits good color development and ensures a desired transmittance while diffusing reflected light in multiple directions. A color developing structure includes a concave-convex layer in which a first surface has a concave-convex structure, and a reflective layer formed on the first surface to extend along the concave-convex structure. A convex surface of the concave-convex structure has a first pattern composed of a plurality of strip portions in plan view. The strip portion has a width in a first direction and a length in a second direction perpendicular to the first direction. The width is smaller than the wavelength of the incident light, and a standard deviation of the lengths of the plurality of strip portions is larger than a standard deviation of the widths.