Laminate, method for producing laminate, and personal authentication medium

Patent metadata

Field	Value
Publication number	US-10471694-B2
Application number	US-201816045162-A
Country	US
Kind code	B2
Filing date	Jul 25, 2018
Priority date	Jan 27, 2016
Publication date	Nov 12, 2019
Grant date	Nov 12, 2019

Abstract

A transparent reflection layer is a visible light refractive index of greater than or equal to 2.0. In a plan view of a plane, the transparent reflection layer is located in a part of the transfer layer. At least a part of the transparent reflection layer is located inside an outline of the transfer layer. A portion of the transfer layer that is nil of the transparent reflection layer is a visible light refractive index of between 1.4 and 1.8 inclusive. The polycarbonate layer encloses the transfer layer. A cross section in a thickness direction of the laminate includes a first cross section that is nil of the transfer layer, a second cross section including the portion of the transfer layer that is nil of the transparent reflection layer, and a third cross section including a portion of the transfer layer that includes the transparent reflection layer.

First claim

The invention claimed is:

1. A method for manufacturing a laminate, the method comprising:
transferring a transfer layer onto a first polycarbonate layer, wherein
the transfer layer includes a plurality of layers including a transparent reflection layer,
the transparent reflection layer has a visible light refractive index of greater than or equal to 2.0, and
in a plan view of a plane in which the transfer layer extends, the transparent reflection layer is located in a part of the transfer layer and at least a part of the transparent reflection layer is located inside an outline of the transfer layer, and a portion of the transfer layer that is nil of the transparent reflection layer has a visible light refractive index of between 1.4 and 1.8 inclusive; and

laminating the first polycarbonate layer and a second polycarbonate layer with the transfer layer together such that the transfer layer is held between and enclosed by the first and second polycarbonate layers.

2. A laminate comprising:
a transfer layer having a plurality of layers including a transparent reflection layer, wherein
the transparent reflection layer has a visible light refractive index of greater than or equal to 2.0,
in a plan view of a plane in which the transfer layer extends, the transparent reflection layer is located in a part of the transfer layer,
at least a part of the transparent reflection layer is located inside an outline of the transfer layer, and
a portion of the transfer layer that is nil of the transparent reflection layer has a visible light refractive index of between 1.4 and 1.8 inclusive; and

a polycarbonate layer enclosing the transfer layer,
wherein a cross section in a thickness direction of the laminate includes
a first cross section that is nil of the transfer layer,
a second cross section including the portion of the transfer layer that is nil of the transparent reflection layer, and
a third cross section including a portion of the transfer layer that includes the transparent reflection layer.

3. The laminate according to claim 2 , wherein the first cross section is nonadjacent to the third cross section.

4. The laminate according to claim 2 or 3 , wherein, in a plan view of the plane in which the transfer layer extends, a region having the third cross section has a shape that represents at least one of a figure, a character, and a pattern.

5. The laminate according to claim 4 , wherein, in a plan view of the plane in which the transfer layer extends, the region having the third cross section has at least one of an acute angle and a right angle.

6. The laminate according to claim 2 , wherein
the transfer layer has a plurality of regions having the transparent reflection layer, and
a minimum distance between at least two of the regions having the transparent reflection layer is between 1 mm and 50 mm inclusive.

7. The laminate according to claim 2 , wherein, in a plan view of the plane in which the transfer layer extends, a region having the third cross section has a width of between 0.5 mm and 5 mm inclusive and a shape of at least one of a straight line, a curved line, and a dotted line.

8. The laminate according to claim 2 , wherein
the transfer layer includes an optical relief formation layer having an optical relief structure, and
the transparent reflection layer is in contact with at least a part of the optical relief structure.

9. The laminate according to claim 2 , wherein at least one of the layers of the transfer layer includes a luminescent material having a maximum emission wavelength in a wavelength region that differs from a wavelength region of a peak wavelength of excitation light.

10. The laminate according to claim 9 , wherein, in a plan view of the plane in which the transfer layer extends, the luminescent material is located in a part of the transfer layer and the luminescent material has a shape that differs from a shape of the transparent reflection layer.

11. An identification medium comprising:
the laminate according to claim 2 , and
an individual information formed by laser.

Assignees

• Toppan Printing Co Ltd

Inventors

• Minamikawa Naoki

Classifications

• B32B2305/347

  Security elements · CPC title

• B32B37/02 Primary

  characterised by a sequence of laminating steps, e.g. by adding new layers at consecutive laminating stations · CPC title

• B42D25/351

  Translucent or partly translucent parts, e.g. windows · CPC title

• B32B2425/00

  Cards, e.g. identity cards, credit cards · CPC title

• B42D25/455

  using heat · CPC title