Appeal No. 1999-1925
Application No. 08/649,887
emission of UV radiation, but that automotive lamps encounter
size constraints which prohibit the use of outer jackets.
Instead of an outer
jacket, doped quartz may be used. (See column 1, lines 28-
29.) However, Parham suggests (column 3, lines 58-63) that
dopants may interfere with light transmission whereas in
automobile uses it is necessary to achieve high light output.
Parham solves the
above problems by using a multi-layer coating where one layer
absorbs deep UV and another layer reflects near UV causing
further vaporization of the liquid metal halide dose within
the arc tube, thereby enhancing lamp performance. (See column
3, lines 24-52.) Thus, Parham suggests the use of a multi-
layer coating regardless of whether the tube is horizontally
or vertically oriented, or, rather, it would have been obvious
to use the multi-layer coating of Parham even in a vertically
aligned arc tube to eliminate the emission of UV light while
causing further vaporization of the liquid metal halide.
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