FIELD: physics.
SUBSTANCE: invention relates to the field of the graphic elements, and is directed to the optical effect layer (OEL), the device and the method of manufacturing the said layer. The optical effect layer comprises a binder and a plurality of non-spherical particles having a nonisotropic reflectivity in the first cross-sectional layer. In the first cross-sectional layer, the optical effect is oriented perpendicular to the extended surface and along the first direction (x). The local average value of the angle between the straight line along the largest observed dimension in the corresponding cross section of those non-spherical particles, which cross the first cross section, and the first direction (x), is changed according to the position (P) function (θ) along the first direction (x). This function is the sum of the monotonically increasing or decreasing first function (θ1) of the position (P) and the periodic alternating second function (θ2) of the position (P). The device for producing the optical effect layer by orienting the magnetic or magnetizable particles dispersed within the binder, contains a set of one or more magnets. The set includes a magnetized magnetic plate and is configured to generate the combined magnetic field. The magnetic field contains the first component similar to the magnetic dipole field and having the North-South axis direction oriented parallel to the magnetized magnetic plate. The magnetic field also contains the second component of the magnetic field, containing a superposition of the individual local dipole-like magnetic poles. The second component corresponds to the alternation of the north and south magnetic poles along the first direction parallel to the North-South axis direction. The first and the second components of the magnetic field are overlaped, at least, in the area adjacent to the extended surface of the magnetized magnetic plate. In the method of manufacturing the optical effect layer, the binder is further hardened to fix the magnetic or magnetizable nonspherical particles in the received positions or orientations. The binder in the hardened condition is partly transparent for electromagnetic radiation at one or more wavelengths in the range of 200 nm - 2500 nm. Furthermore, the security document comprising the optical effect layer and the use of the optical effect layer as a security feature or the security element in the fields related to document protection, are disclosed.
EFFECT: increasing the image quality, improving adhesion, increasing the coating resistance to wear and contamination and improving the optical appearance.
28 cl, 32 dwg, 2 ex
