Light unit with a light guiding element
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United States of America Patent
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N/A
Issued Date -
Nov 29, 2001
app pub date -
Feb 22, 2001
filing date -
Aug 24, 1998
priority date (Note) -
Abandoned
status (Latency Note)
Importance
Abstract
A light (1) comprises a light source (4) and a wedge-shaped light guiding element (3) having two wedge surfaces (11, 13) and a light entry face (10) extending between the wedge surfaces where they are farthest apart. Light from the source (4) enters light guiding element via the face (10) and is reflected by one wedge surface (13) against the other wedge surface (11) where it exits from the light guiding element (3). To improve radiation characteristics, the other wedge surface (11), which is an exit surface, is profiled with adjacent elevations and indentations extending crosswise to the direction of the wedge. A transparent diffuser (20) is positioned at a distance in front of the exit surface (11). The side of the diffuser (20) facing away from the light exit surface is profiled with adjacent elevations and indentations. The distance between the diffuser (20) and the light guiding element (3) prevents light from entering the diffuser at any angle and thus increases the effectiveness of the profiling.
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