SUPERHIGH-FREQUENCY EXCITER OF ELECTRODELESS GAS-DISCHARGE LAMP Russian patent published in 2004 - IPC

FIELD: lighting and superhigh- frequency engineering; lighting and irradiating devices generating beams in visible or ultraviolet spectra. SUBSTANCE: proposed device is designed as superhigh-frequency exciter of electrodeless gas-discharge lamps and lighting fixtures built around them for offline operation and in combination with set of hollow light guides. Exciter has rectangular waveguide assembled of pairs of opposing parts and narrow walls and is provided with two cylindrical microwave cavities and electrodeless lamp on each of their axes; microwave cavities are electrodynamically coupled with waveguide through radiators made on opposing walls of waveguide. Two spatially separated electrodeless lamps are pumped with microwave power from single high-efficiency and high-stability magnetron operating in optimal mode. Such module is easily joined with oppositely directed (and not always along same straight line) light beam shapers, each being optically coupled with respective lamp. Exciter provides for re- distribution of mentioned magnetron output power without disturbing its optimal mode of operation to shape differently directed light beams in single microwave lamp module. Proposed arrangement also makes it possible to build long-range and local dual-action (bidirectional) lighting fixtures of standard or desired illumination, to afford reduced luminance difference on long-range lighting fixtures with bidirectional bright areas on light strings including those whose axes are tilted through certain angle, from single microwave lamp module, to independently build different light intensity curves in different directions, to spatially dispose microwave lamp module and its points of connection to supply mains. All these features of proposed device provide for optimal design of lighting system architecture in local and, in particular, long-range locations (tunnels, undercrossings and surface crossings, station platforms, and the like) with minimal number of attended microwave lamp modules and with provision for their arrangement at easy-to-connect points, as well as for reducing illumination difference. EFFECT: enlarged functional capabilities; enhanced economic efficiency. 5 cl, 4 dwg