FIELD: optical changeable elements, in particular, optically changeable protective element made in form of multi-layer film base, possible use for protecting banknotes, credit cards, documents or products.
SUBSTANCE: in accordance to the invention, multilayer film base contains thin film with interference structure of layers for forming color shift by interference and/or metallic reflective layer. Optically changeable element contains transparent window, and thin film and/or metallic reflective layer are made correspondingly as partial element, namely, as partial thin-film element or as partial reflective layer. Aforementioned partial element or partial elements surround surface area of transparent window.
EFFECT: high degree of forgery protection for product being protected.
3 cl, 10 dwg
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