公开(公告)号：US20190329527A1

公开(公告)日：2019-10-31

申请号：US16508010

申请日：2019-07-10

Applicant: TOPPAN PRINTING CO., LTD.

Inventor： Mai Yoshimura ,  Kyoko Sakai ,  Yoko Ichihara ,  Masashi Kawashita ,  Naoki Minamikawa

IPC: B32B7/02 ,  B32B3/30 ,  G02B5/18

Abstract: A color developing structure has an uneven layer with an uneven structure on a surface thereof, a multilayer film layer positioned on the uneven structure and having a surface shape that follows the uneven structure, and a protective layer covering the surface of the multilayer film layer. Projections that constitute the uneven structure have a shape with one or more steps, a pattern constituted from projected images of the projections in a virtual plane on which the uneven structure is projected in the thickness direction of the uneven layer includes a pattern comprising a set of a plurality of rectangles in which a length along a second direction is equal to or greater than a length along a first direction, the length of the rectangles along the first direction is equal to or less than subdirection is greater than the standard deviation of the length along the first direction.