Electrodeless fluorescent lamp with spread induction coil

摘要

An electrodeless inductively-coupled fluorescent lamp which operates at radio frequencies and contains an induction coil (1) which is inserted in a reentrant cavity (2) of the envelope (7) and is spread along the length of the reentrant cavity (2). The coil (1) is disposed within a cylinder (14) of thermally conductive metal. The use of the spread coil provides for reduction of starting and operation voltages of the lamp and results in lowering of the energy of ions bombarding the inner surface of the envelope (7) and the cavity (2) and therefore improves lamp maintenance and increases lamp life.