Multi-layer optical storage using pre-orientation in a glass...

G - Physics – 11 – B

Patent

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G11B 7/24 (2006.01) G11B 7/25 (2006.01)

Patent

CA 2489777

The invention relates to producing an optical memory which combines stability of written and non-written data with high writing speed and good sensitivity during writing, such an optical memory as well as a method of writing in such a memory. The optical memory has a liquid crystal (LC) layer with a first type of LC molecules (102) aligned in one direction, forming a polymer network (108), and a second type of LC molecules (104) oriented in a perpendicular direction, in which the orientation of said second type of LC molecules is meta-stable. By making use of a force, exerted on the second type of LC molecules (104), by the network of aligned crosslinked molecules, an increase in relaxation rate for the second type of molecules (104) from a meta-stable state of orientation, is achieved, which makes it possible to use said relaxation for writing data at an increased writing rate.

Cette invention, qui a trait à la production d'une mémoire optique associant la stabilité de données écrites et non écrites à une vitesse élevée d'écriture des données ainsi qu'à une bonne sensibilité en cours d'écriture, concerne également une technique d'écriture dans cette mémoire. Cette mémoire optique est pourvue d'une couche à cristaux liquides (LC), possédant un premier type de molécules LC (102), alignées dans une direction et formant un réseau polymère (108), ainsi qu'un second type de molécules LC (104), orientées perpendiculairement, l'orientation de ce second type de molécules étant métastable. On obtient, en exerçant une certaine force sur ce second type de molécules LC (104) par le réseau des molécules réticulées alignées, une augmentation du niveau de souplesse de ces molécules, du fait de l'état métastable de leur orientation, ce qui permet d'utiliser cette souplesse pour écrire des données à une cadence accélérée.

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