公开(公告)号：US20200230995A1

公开(公告)日：2020-07-23

申请号：US16652321

申请日：2018-09-28

Applicant: SICPA HOLDING SA

Inventor： Andrea CALLEGARI ,  Pierre DEGOTT ,  Todor DINOEV ,  Christophe GARNIER ,  Alain MAYER ,  Yuliy SCHWARTZBURG ,  Romain TESTUZ ,  Mark PAULY

IPC: B42D25/324 ,  B42D25/435 ,  B42D25/44

Abstract: The invention relates to a thin optical security element comprising a reflective or refractive light-redirecting surface having a relief pattern operable to redirect incident light from a light source and form a projected image on a projection surface, the optical parameters of this optical security element fulfilling a specific projection criterion such that the projected image comprises a caustic pattern reproducing a reference pattern that is easily visually recognizable by a person. The invention also relates to a method for designing a relief pattern of an optical security element.

公开(公告)号：US20230288697A1

公开(公告)日：2023-09-14

申请号：US17917845

申请日：2021-04-07

Applicant: SICPA HOLDING SA

Inventor： Yuliy SCHWARTZBURG ,  Romain TESTUZ ,  Andrea CALLEGARI

IPC: G02B26/08 ,  G02B27/18 ,  G03F1/68 ,  G02B1/10 ,  B42D25/30 ,  B42D25/405

CPC classification number: G02B26/0875 ,  B42D25/30 ,  B42D25/405 ,  G02B1/10 ,  G02B27/18 ,  G03F1/68

Abstract: The invention relates to an anti-copy optical element comprising a caustic layer and a mask layer configured to simultaneously display a visible image reproducing a reference image and form a projected image containing a visible caustic pattern reproducing a reference pattern, upon illumination of the optical element with a light source, the projected image being distinct from the reference image. The invention also relates to a method for designing a relief pattern of a light-redirecting surface of said caustic layer consistently with the transmission properties of the mask layer.

公开(公告)号：US20200269627A1

公开(公告)日：2020-08-27

申请号：US16652365

申请日：2018-09-28

Applicant: SICPA HOLDING SA

Inventor： Andrea CALLEGARI ,  Pierre DEGOTT ,  Todor DINOEV ,  Christophe GARNIER ,  Alain MAYER ,  Yuliy SCHWARTZBURG ,  Romain TESTUZ ,  Mark PAULY

IPC: B42D25/324 ,  B42D25/435 ,  B42D25/425 ,  B42D25/29 ,  B42D25/23 ,  B42D25/24

Abstract: The invention relates to a thin optical security element comprising a reflective or refractive light-redirecting surface having a relief pattern operable to redirect incident light from a light source and form a projected image on a projection surface, the projected image comprising a caustic pattern reproducing a reference pattern that is easily visually recognizable by a person. The invention also relates to a method for designing a relief pattern of a light-redirecting surface of a thin optical security element.