Lightguide tamper seal
First Claim
1. A tamper seal comprising an optical waveguide comprising at least a first portion and a second portion configured to be respectively arranged on a first part and on a second part of an object, said first and second parts being movable relative to each other,wherein said optical waveguide is a flat and flexible multimode optical waveguide defining a plane and having, parallel to said plane, a first side and a second side opposite to said first side, said waveguide comprising at least a rectangular shaped waveguide core that has a smallest dimension, defined perpendicular to said propagation direction, greater than 10 μ
- m and smaller than 10 mm, said first portion comprising on one of said sides an input coupler arranged to couple incident light into said optical waveguide, said second portion comprising on one of said sides at least one output coupler arranged to couple out of said optical waveguide at least partially light guided in the optical waveguide,wherein said input coupler, said optical waveguide and said output coupler are configured to transmit light from said input coupler to said output coupler, said optical waveguide being further configured to be at least partially disruptable between said first portion and said second portion, said optical waveguide comprising a layer configured to produce at said outcoupling surface a visually distinctive appearance when light is incoupled in said incoupler, said layer being further configured so that said visually distinctive appearance is changed in response to a change of the optical guiding properties of said flat multimode waveguide in response to an at least partial disruption of said optical waveguide.
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Accused Products
Abstract
A tamper seal includes an optical waveguide arranged to guide a propagating light-beam along a propagation direction. First and second portions of the tamper seal are configured to be arranged on first and second parts, respectively, which are movable relative to each other. The first portion has an input coupler arranged to couple incident light into the optical waveguide, and the second portion has at least one output coupler arranged to couple out of the optical waveguide at least partially light guided in the optical waveguide. The input coupler, the optical waveguide, and the output coupler are configured to transmit light from the input coupler to the output coupler. The waveguide is configured to be disruptable and includes a layer having a distinctive appearance that is changed in response to an at least partial disruption of said optical waveguide.
11 Citations
21 Claims
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1. A tamper seal comprising an optical waveguide comprising at least a first portion and a second portion configured to be respectively arranged on a first part and on a second part of an object, said first and second parts being movable relative to each other,
wherein said optical waveguide is a flat and flexible multimode optical waveguide defining a plane and having, parallel to said plane, a first side and a second side opposite to said first side, said waveguide comprising at least a rectangular shaped waveguide core that has a smallest dimension, defined perpendicular to said propagation direction, greater than 10 μ - m and smaller than 10 mm, said first portion comprising on one of said sides an input coupler arranged to couple incident light into said optical waveguide, said second portion comprising on one of said sides at least one output coupler arranged to couple out of said optical waveguide at least partially light guided in the optical waveguide,
wherein said input coupler, said optical waveguide and said output coupler are configured to transmit light from said input coupler to said output coupler, said optical waveguide being further configured to be at least partially disruptable between said first portion and said second portion, said optical waveguide comprising a layer configured to produce at said outcoupling surface a visually distinctive appearance when light is incoupled in said incoupler, said layer being further configured so that said visually distinctive appearance is changed in response to a change of the optical guiding properties of said flat multimode waveguide in response to an at least partial disruption of said optical waveguide. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
- m and smaller than 10 mm, said first portion comprising on one of said sides an input coupler arranged to couple incident light into said optical waveguide, said second portion comprising on one of said sides at least one output coupler arranged to couple out of said optical waveguide at least partially light guided in the optical waveguide,
Specification