Patent ID: 7492098

Claim:
A coil assembly body structure for an electrodeless discharge lamp, comprising: an airtight container bulb of a transparent material and enclosing a discharge gas; and a coil assembly body contained in a hollow portion provided in the airtight container bulb, for generating a high frequency electromagnetic field by conducting a high frequency current in a coil to excite the discharge gas so as to emit light, wherein the coil assembly body comprises: a pipe-shaped cylinder of a thermal conductor for heat release; a skeleton-shaped bobbin of a substantially cylindrical shape that includes a side surface and mounted on an outer surface of the pipe shaped cylinder along an axial direction of the pipe shaped cylinder, the skeleton-shaped bobbin including an opening extending radially through the skeleton-shaped bobbin at the side surface of the sugbstantially cylindrical shape; a core of a soft magnetic material provided at the opening the of skeleton-shaped bobbin and being in substantial surface contact with the cylinder; and a coil wound around a surface of the skeleton-shaped bobbin and the core.