公开(公告)号：EP3851291A1

公开(公告)日：2021-07-21

申请号：EP21161980.4

申请日：2018-05-25

Applicant: Toppan Printing Co., Ltd.

Inventor： Ide, Hidetaka ,  Minamikawa, Naoki

IPC: B42D25/328 ,  B42D25/435 ,  G02B5/18 ,  G09F3/02 ,  B42D25/324

Abstract: An information recording medium (10a) formed by laminating a transparent protective layer (40) and a base material (20) having laser color-developing properties is provided. The information recording medium (10a) includes an intermediate layer (30) that is disposed between the transparent protective layer (40) and the base material (20). In the information recording medium (10a), the intermediate layer (30) includes a diffraction structure layer (32) that has a diffraction structure, and a first reflective layer (36) that reflects visible light and is destroyed when irradiated with a laser beam. Light, when incident from a transparent protective layer (40) side, causes a diffracted light pattern to appear in the diffraction structure layer (32) so as to be observable from the transparent protective layer (40) side. A laser beam, when applied from the transparent protective layer (40) side, passes through the diffraction structure layer (32), destroys the first reflective layer (36), and develops color in the base material (20).

公开(公告)号：EP3929002A1

公开(公告)日：2021-12-29

申请号：EP21191887.5

申请日：2019-01-09

Applicant: Toppan Printing Co., Ltd.

Inventor： Minamikawa, Naoki

IPC: B42D25/324 ,  B42D25/455 ,  B42D25/46 ,  B42D25/41 ,  B32B7/06 ,  B42D25/23 ,  B42D25/24 ,  B42D25/328 ,  G02B5/18 ,  B42D25/391

Abstract: A laminate (10) includes a recording layer (11), a translucent front covering layer (12) and a security foil (20) laminated between the recording layer and the front covering layer and sealed in the laminate. The security foil has a thickness that is 1/5 or less the thickness of the recording layer to prevent or reduce falsification reusing the security foil. The security foil includes a relief layer (21) having a relief surface and a protective layer (22) covering the relief surface. In the thickness direction of the laminate, the protective layer adheres to the recording layer and the relief layer adheres to the front covering layer. The adhesion strength between the security foil and the recording layer is higher than the adhesion strength between the security foil and the front covering layer.