公开(公告)号：US11428852B2

公开(公告)日：2022-08-30

申请号：US16751176

申请日：2020-01-23

Applicant: TOPPAN PRINTING CO., LTD.

Inventor： Hiroyuki Endo ,  Toshiki Toda

IPC: B42D25/22 ,  G01M11/02 ,  G02B5/02 ,  B42D25/21 ,  B42D25/373

Abstract: A dielectric layer comprising an embossed surface and a flat surface which is located at a side opposite to the embossed surface is provided. The plane that approximates the flat surface is the X-Y plane, and the normal direction to the X-Y plane is the Z direction. The embossed surface has inclined surfaces that are inclined with respect to the Z direction, and the inclined surfaces reflect incident light incident on the dielectric layer and emerge reflected light. The elevation angle, which is an angle between the inclined surface and the X-Y plane, is α. The refractive index of the dielectric layer is n. These values satisfy Formula (1): sin α≤(1/n)

公开(公告)号：US11294108B2

公开(公告)日：2022-04-05

申请号：US15867377

申请日：2018-01-10

Applicant: TOPPAN PRINTING CO., LTD.

Inventor： Hiroyuki Endo ,  Akira Nagano

IPC: G02B5/18 ,  G09F19/14 ,  G02B5/02 ,  B42D25/324 ,  B42D25/328

Abstract: Each protrusion surface has a shape of a strip extending in an extension direction perpendicular to the arrangement direction. Each protrusion surface tapers toward a top section in a thickness direction of an uneven structure. Each depression surface has a shape of a strip extending in the extension direction. Each depression surface tapers toward a bottom section in the thickness direction of the uneven structure. The protrusion surfaces and the depression surfaces are arranged at a period that limits reflection of light that is incident on the uneven surface in a front-view direction of the uneven surface and diffracts the light incident on the uneven surface to emit diffracted light in an oblique view direction of the uneven surface. The uneven structure has a property of absorbing light incident on the uneven structure.