| 摘要 |
An illumination system comprising, a) a light source; b) a light-directing assembly ( 1 ) in close proximity to the light source and comprising a plurality of microprisms ( 6 ), each microprism comprising an input surface ( 7 ) that admits light radiating from the light source, an output surface ( 8 ) distal from and parallel to the input surface ( 7 ), and at least one sidewall ( 9 ) disposed between and contiguous with the input and output surfaces and forming an obtuse tilt angle with respect to the input surface ( 7 ) and further positioned for effecting total reflection of the light rays received by the input surface ( 7 ), the sidewalls ( 9 ) of the microprisms ( 6 ) defining interstitial regions ( 10 ) between the microprisms ( 6 ); c) at least one blocking means ( 11 ) positioned to block the passage of light through the sidewalls ( 9 ); and d) an optical means ( 2, 3, 4 ) located between the light source and the light-directing assembly ( 1 ), with the special feature that e) said optical means ( 2, 3, 4 ) comprise a reflective powder ( 4 ) to at least substantially shield the blocking means ( 11 ) from direct exposure to lig radiated from the light source.
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