Electrodeless lighting apparatus

Abstract

An electrodeless lighting apparatus includes: a waveguide for guiding microwave energy generated from a microwave generator; a resonance unit coupled with an outlet of the waveguide and comprising at least two resonators having mesh structures which are slidingly coupled with each other in the longitudinal direction such that the height of the resonance unit is varied and an aperture ratio according to the height of the resonance unit is varied, the resonance unit for resonating the microwave energy guided through the waveguide; and a bulb located inside the resonance unit and generating light as a material enclosed therein becomes plasma by microwave energy, so that the overall length of the resonance unit can be varied or aperture ratios of the mesh corresponding to the height of the resonance unit can be adjusted according to a bulb type and conditions to which the electrodeless lighting apparatus is applied, whereby a resonator does not need to be separately manufactured according to its length or aperture ratio. Accordingly, time and costs spent manufacturing a new resonator can be reduced to thereby lower the unit cost and maintenance costs can be reduced by decreasing the number of assembly processes when changing a bulb.