Patent ID: 6377383
Filing Date: 2002-04-23
Classification: B29C,B29K,G02B,G09F

Abstract:
Apparatus for controllably switching an interface between a reflective state in which light incident upon said interface undergoes total internal reflection and a non-reflective state in which total internal reflection is prevented at said interface, said apparatus comprising:(a) a dielectric having a stiffened surface portion; (b) a separator positioned between said interface and said stiffened surface portion to maintain a gap there-between; (c) a first electrode on said interface; (d) a second electrode on said stiffened surface portion; and, (e) a voltage source for controllably applying a variable voltage potential between said electrodes; wherein: (i) application of said voltage potential between said electrodes moves said stiffened surface portion into optical contact with said interface, producing said non-reflective state at said interface; (ii) in the absence of said voltage potential between said electrodes said separator moves said stiffened surface portion away from optical contact with said interface, producing said reflective state at said interface.