LIGHTGUIDE TAMPER SEAL Russian patent published in 2018 - IPC G09F3/03 

FIELD: lighting equipment.

SUBSTANCE: invention concerns tamper seal (1) comprising an optical waveguide (2) arranged to guide a propagating light-beam along a propagation direction, comprising at least first portion (2A) and second portion (2B), intended to be respectively arranged on a first part and on a second part of an object, wherein said first and second parts are movable relative to each other. Said optical waveguide (2) is a multimode waveguide comprising at least a waveguide core that has its smallest dimension, defined perpendicular to said propagation direction, greater than 10 pm and smaller than 10 mm. Said first portion (2A) comprises input coupler (3) arranged to couple incident light into said optical waveguide (2), and wherein said second portion (2B) comprises at least one outcoupling surface arranged to couple out at least partially light guided in optical waveguide (2). Said input coupler (3), said optical waveguide (2) and said outcoupling surface are arranged so as to transmit light from said input coupler (3) to said outcoupling surface, wherein said optical waveguide (2) is further designed to be at least partially disruptable between said two portions, and wherein said optical waveguide (2) loses or changes at least partially its optical guiding properties after its disruption.

EFFECT: lightguide tamper seal is proposed.

19 cl, 19 dwg