Electric switch unit for the control of air conditioning units in automotive vehicles
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United States of America Patent
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-
Jan 31, 1995
Grant Date -
N/A
app pub date -
Aug 11, 1993
filing date -
Aug 20, 1992
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An electric switch unit, in particular for the control of air conditioning units in automotive vehicles. The switch unit includes pushbuttons whose symbols are illuminated by light which is guided from a central source of light through a light-guiding member. The light-guiding member is composed of interconnected light-guiding bars to which projections are molded. From the projections the light exits toward the pushbuttons. The front faces of the projections are concavely curved, and as a result a uniform illumination of the symbol areas is provided. The light-guiding bars are furnished with totally reflecting surfaces, and as a result the total quantity of light incident upon them is reflected into the projections. The quantities of light exiting from each projection are equal. Due to the arrangement of a focusing lens at the transition of the light from the source of light to the light-guiding bars, a parallel beam of light is emitted into the latter.
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Family
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