Optical information carrier

G - Physics – 06 – K

Patent

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Details

G06K 19/16 (2006.01) B41M 3/14 (2006.01) B42D 15/10 (2006.01) G02B 5/12 (2006.01) G02B 5/18 (2006.01) G03H 1/02 (2006.01) G06K 19/06 (2006.01)

Patent

CA 2238384

An optical information carrier (1) is in the form of a composite laminate (2) having a carrier foil (3). The underside (4) and the top side (5) of the carrier foil (3) are provided with optically effective structures (6; 7). The carrier foil (3) is approximately transparent for light in a predetermined spectral range. The structures (7) allow light impinging on the top side (5) to penetrate at least partially into the composite laminate (2). The structures (6) on the underside (4) are microscopically fine relief structures (10) which are covered with a base layer (8) whose refractive index differs from the refractive index of the carrier foil (3) in at least a portion of the electromagnetic spectrum so that the structures (6) on the underside (4) at least partially reflect and diffract the light (11) which has penetrated into the composite laminate (2). The structures (7) on the top side (5) in turn modify the diffracted light (18). The interplay of the two structures (6; 7) provides manifold characteristic optical effects such as moiré effects and light guide effects. It is also possible in that way to produce optical storage means, retroreflectors and other security features, being well protected from foreign access.

L'invention concerne un porteur d'informations optiques (1) sous la forme d'un stratifié composite (2) ayant une feuille de support (3). La face inférieure (4) et la face supérieure (5) de la feuille de support (3) ont des structures optiquement actives (6; 7). La feuille de support (3) est sensiblement transparente à la lumière dans une plage spectrale prédéterminée. Les structures (7) permettent à la lumière arrivant sur la face supérieure (5) de pénétrer au moins partiellement dans le stratifié composite (2). Les structures (6) de la face inférieure (4) sont des structures ayant un relief fin et microscopique (10) et elles sont recouvertes d'une couche de base (8) dont l'indice de réfraction diffère de l'indice de réfraction de la feuille de support (3) au moins dans une partie du spectre électromagnétique, si bien que les structures (6) sur la face inférieure (4) réfléchissent et diffractent au moins partiellement la lumière (11) qui a pénétré dans le stratifié composite (2). Les structures (7) sur la faces supérieure (5) modifient à leur tour la lumière diffractée (18). L'interaction des deux structures (6; 7) permet d'avoir différents effets optiques tels que des effets de moiré et un effet de guide de lumière. Il est également possible de réaliser ainsi des moyens de stockage optique, des rétroréflecteurs et d'autres systèmes de sécurité, bien protégés contre les atteintes externes.

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