Appeal No. 1998-2148
Application 08/764,783
fluorescent lamp. In particular, referring to Figure 1, coil
1 is disposed within a reentrant cavity 2 within a bulbous
envelope 7. Coil 1 is also disposed within a cylinder 14 of
thermally conductive metal. Coil 1 has 7 to 11 turns, with a
pitch of 1 mm to 10 mm, a wire diameter of 0.5 mm to 3 mm, and
a height to diameter ratio of 0.5 to 5. Thermally conductive
cylinder 14 is attached to, and transfers heat to, fixture 15.
Representative independent claim 1 is reproduced as
follows:
1. An electrodeless fluorescent RF lamp and fixture
comprising:
a bulbous lamp envelope and a reentrant cavity
disposed in said envelope, a rare gas and vaporizable metal
fill in said envelope and a phosphor coating on the interior
thereof for generation of visible light;
a lamp base disposed outside said envelope and said
fixture being attached to said lamp base;
a cylinder formed of a light thermally-conductive
metal disposed in said reentrant cavity, said cylinder being
attached to said lamp base;
an induction coil and radio frequency excitation
generating means associated with said coil for the generation
of a plasma to produce radiation to excite said phosphor
coating, said coil and said means being situated outside said
envelope and fitted within said cavity and within said
2
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