US 12,466,197 B2
Data protector, data protection seal, and drawing device
Takehisa Ishida, Tokyo (JP)
Assigned to Sony Group Corporation, Tokyo (JP)
Appl. No. 17/436,138
Filed by Sony Group Corporation, Tokyo (JP)
PCT Filed Feb. 13, 2020, PCT No. PCT/JP2020/005432
§ 371(c)(1), (2) Date Sep. 3, 2021,
PCT Pub. No. WO2020/189104, PCT Pub. Date Sep. 24, 2020.
Claims priority of application No. 2019-052744 (JP), filed on Mar. 20, 2019.
Prior Publication US 2022/0126596 A1, Apr. 28, 2022
Int. Cl. B41J 2/475 (2006.01); B41M 5/28 (2006.01); B41M 5/46 (2006.01)
CPC B41J 2/4753 (2013.01) [B41M 5/28 (2013.01); B41M 5/46 (2013.01); B41J 2002/4756 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A data protector comprising:
a data layer configured to record confidential information as a visible image; and
one or a plurality of cover layers disposed at least one of above or below the data layer and configured to transition between a color-developed state and a decolored state in a visible light wavelength region,
wherein the one or a plurality of cover layers includes a leuco dye,
wherein
the data layer is configured to transition between the color-developed state and the decolored state in the visible light wavelength region, and includes a reversible material whose transition condition differs from a transition condition of the one or the plurality of cover layers, and
the confidential information is recorded, due to color development of the reversible material, on the data layer as the visible image.