Method and apparatus for controllable frustration of total...

G - Physics – 02 – B

Patent

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G02B 26/02 (2006.01) B29C 59/16 (2006.01) B29D 11/00 (2006.01) C08J 5/00 (2006.01) B29C 35/08 (2006.01)

Patent

CA 2301289

A method and apparatus for facilitating controllable switching an interface (12) between a reflective state in which light (14) incident upon the interface undergoes total internal reflection, and a non-reflective state in which total internal reflection is prevented at the interface. The apparatus incorporates a member (10 - preferably an elastomer) which is deformable with respect to the interface. The member's Young's Modulus in portions (18) of the member adjacent the interface is substantially greater (i.e. stiffer) than the member's Young's Modulus in portions of the member away from the interface. The stiffened portion of the member adjacent the interface may be in the form of a microstructure (20). A pair of electrodes (22, 24) coupled to a voltage source can be provided to controllably deform the member into optical contact with the interface, within a continuously variable range of optical contact values, to produce the non-reflective state in selectably varying degrees.

L'invention concerne un procédé et un dispositif permettant de faciliter la commutation commandée d'une interface (12) entre un état réflectif dans lequel la lumière (14) incidente sur l'interface subit une réflexion interne totale, et un état non réflectif dans lequel la réflexion interne totale est empêchée au niveau de l'interface. Ce dispositif comprend un élément (10) (de préférence un élastomère) pouvant subir une déformation par rapport à l'interface. Le module de Young de l'élément mesuré dans les parties (18), de l'élément adjacentes à l'interface est sensiblement plus grand (c.-à-d. cette partie est plus rigide) que le module de Young mesuré dans les parties éloignées de l'interface. La partie d'élément rigidifiée adjacente à l'interface peut se présenter sous forme d'une microstructure (20). Deux électrodes (22, 24) couplées à une source de tension permettent de déformer l'élément de manière maîtrisée pour établir un contact optique avec l'interface, dans un intervalle à variation continue de valeurs de contact optique, de manière à produire un état non réflectif à divers degrés réglables.

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