Electric switch unit for the control of air conditioning units i

Details Electric switch unit for the control of air conditioning units i Electric switch unit for the control of air conditioning units i

1993-08-11

1995-01-31

Recla, Henry J.

Electricity: circuit makers and breakers

Electric switch details

Indicators

200310, 200311, H01H 900

Patent

active

053860900

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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patent: 5128842 (1992-07-01), Kermochi
patent: 5188220 (1993-02-01), Schmitt-Walter
patent: 5227773 (1993-07-01), Wu et al.

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