OPTICAL SEAL Russian patent published in 1998 - IPC

FIELD: security equipment, in particular, testing integrity of guarded articles. SUBSTANCE: device has information element, which is made from discrete particles which are positioned with possibility of multiple movement and fixation by means of fixation mechanism during sealing in hollow housing, which has two members with transparent piece. Fixation mechanism is designed as piston which is spring-loaded towards transparent piece and engages with mobile and stationary members of housing. EFFECT: possibility to generate unique optical pattern which is identified by automatic means. 3 cl, 2 dwg