Retroreflecting structure selectively reflecting one or more bands of the electromagnetic spectrum

摘要

A retroreflective material 100, 101, 102 and 103 that comprises a retroreflective element 20, 20uv and 20ir that is adapted to transmit energy from the visible spectrum while simultaneously reflecting energy from the non-visible spectrum such as UV or IR. In their microspheric optical body form, the materials 100, 101, 102 and 103 comprise a substantially visibly transparent microscopic bead 22 underneath which a reflector 24, 24uv and 24ir is placed. Reflector 24uv narrowly reflects some or the entire ultraviolet spectrum while reflector 24ir narrowly reflects some or the entire IR spectrum. Generic reflector 24 may reflect a sub-portion of the visible spectrum such as red light. Materials 100, 101, 102 and 103 may be augmented with fluorescent compounds embedded within either bead 22f itself or into a fluorescent matrix layer 23 placed between the underside of bead 22 and reflector 24, 24uv and 24ir forming fluorescent retroreflective materials 104 and 105.