An assembly comprising a film bounded by a frame, the film having a first thermal expansion coefficient along a first direction parallel to the film and a second thermal expansion coefficient along a second direction parallel to the film, wherein thermal expansion of the film compared to that of the...http://www.google.es/patents/US6160663?utm_source=gb-gplus-sharePatente US6160663 - Film confined to a frame having relative anisotropic expansion characteristics
Film confined to a frame having relative anisotropic expansion characteristics
