Appeal No. 1999-1925
Application No. 08/649,887
convected power less than 200 mg /cm , and a wall loading2 2
factor
of no greater than 25 watts/cm . Claim 1 is illustrative of2
the claimed invention, and it reads as follows:
1. A low wattage arc discharge light source exhibiting
high brightness properties comprising:
an arc tube having an arc chamber formed therein;
said arc tube having an elongated portion;
a fill disposed in said arc chamber and energizable to a
discharge condition, said fill including a dose of mercury;
at least two electrodes extending from generally opposite
vertical directions into a region of said arc chamber, said
region being surrounded by said elongated portion of said arc
tube, said electrodes being separated by an arc gap of less
than 4 mm and wherein, upon energization of said light source,
an operating voltage is developed across said at least two
electrodes resulting in an arc;
said arc chamber having a size dimension selected so
that, in association with a selected fill density, results in
a convection stability value less than 750 milligrams squared
per cubic centimeter for improving thermal uniformity, and a
convected power of less than 200 milligrams squared per
squared centimeter;
said arc tube has arc tube dimension values including a
wall thickness that are balanced to achieve a wall loading
2
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