Light-guide lights providing a substantially monochromatic beam
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United States of America Patent
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Mar 12, 2013
Grant Date -
Oct 7, 2004
app pub date -
Aug 28, 2002
filing date -
Oct 3, 2001
priority date (Note) -
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status (Latency Note)
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Abstract
A light-guide light is described that is capable of providing a substantially monochromatic beam of light, and is suitable for use as a signal lamp in an automotive vehicle. The light (1) comprises a housing defining a light-guiding optical cavity (4) having first and second major faces (5, 6), and a light source (11) arranged to direct light into the cavity from one side. The light source may be an array of light emitting diodes providing substantially monochromatic light. The first major face (5) comprises an interference film (for example, a multilayer polymeric film) that, for light at the design wavelength, substantially transmits light that is incident on the film over a limited angular range and substantially reflects light that is incident at other angles. The second major face (6) comprises a scattering reflective material having a reflectance of at least 85%, for example a highly-efficient reflective material provided with a suitable textured pattern.
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