Patent ID: 7088056

Claim:
A self-ballasted electrodeless fluorescent lamp, comprising: a luminous bulb in which a luminous gas containing at least mercury is enclosed and which has a cavity portion; an induction coil inserted in the cavity portion; a circuit board electrically connected to the induction coil; a case in which the circuit board is placed; and a base attached to the case and electrically connected to the circuit board; and a bobbin including a winding rod, around which the induction coil is wound, and a base portion, which is placed approximately at a right angle with respect to the winding rod and which supports the winding rod, wherein a ballast circuit for supplying high frequency power to the induction coil is formed on the circuit board; the luminous bulb includes an approximately spherical outer tube and an inner tube defining the cavity portion; the circuit board is placed approximately horizontally when a central axis of the inner tube is placed vertically; a connection wire for electrically connecting the induction coil and the circuit board extends from one end of the induction coil into a region beyond an outer edge of the cavity portion, and is connected to the circuit board; and the connection wire is placed so as to be spaced apart from a sealing portion of the outer and inner tubes; the winding rod of the bobbin is inserted in the cavity portion; the base portion of the bobbin is disposed between the luminous bulb and the circuit board; the connection wire extends from the one end of the induction coil so as to pass on or above a surface of the base portion which is located close to the luminous bulb; and protrusion, which supports part of the luminous bulb in such a manner as to lift the luminous bulb in a direction opposite to the base, is formed on the base portion, which allows the connection wire to be disposed spaced apart from the sealing portion.