MICROCAPSULE WITH LIQUID CRYSTAL Russian patent published in 2015 - IPC C09K19/54 C09D11/10 B41M3/14 B42D15/00 

FIELD: physics, computer engineering.

SUBSTANCE: group of inventions relates to a printing layer of a security element for a data medium. The printing layer comprises elastic microcapsules. The microcapsules have inside them a cholesteric phase-forming liquid crystal which is fixed by a compressible elastomer having at least two areas distinguished by elastic properties. In an uncompressed initial state of the elastomer, the cholesteric phase on said areas has the same specified winding pitch of its spiral structure. Said areas exhibit identical optical properties. With uniform mechanical pressure on the printing layer, said areas experience different deformation and begin to differ by the winding pitch of the spiral structure of the cholesteric phase, thereby reflecting radiation of different colours. The printing layer becomes visible to a person. The invention also describes a method of making a printing layer, a security element, a data medium and a transfer element, having said security element.

EFFECT: invention provides high degree of security of a data medium.

12 cl, 6 dwg