公开(公告)号：EP0940062A4

公开(公告)日：2000-02-02

申请号：EP97947557

申请日：1997-11-18

申请人： FUSION LIGHTING INC

发明人： SIMPSON JAMES

IPC分类号： H05B41/24 ,  H05B41/16 ,  H01J65/04

CPC分类号： H05B41/24

摘要： An electrodeless lamp waveguide structure (20) includes tuned absorbers (102, 200) for spurious RF signals. A lamp waveguide (24) with an integral frequency selective attenuation includes resonant absorber (102, 200) positioned within the waveguide (24) to absorb spurious out-of-band RF energy. The absorbers (102, 200) have a negligible effect on energy at the selected frequency used to excite plasma in the lamp. In a first embodiment, one or more thin slabs (80, 82) of lossy magnetic material are affixed to the sidewalls (86, 88) of the waveguide (24) at approximately one quarter wavelength of the spurious signal from an end wall of the waveguide. The positioning of the lossy material optimizes absorption of power from the spurious signal. In a second embodiment, one or more thin slabs (80, 82) of lossy magnetic material are used in conjunction with band rejection waveguide filter elements (100, 108). In a third embodiment, one or more microstrip filter elements (200, 202) are tuned to the frequency of the spurious signal and positioned within the waveguide (24) to couple and absorb the spurious signal's energy. All three embodiments absorb negligible energy at the selected frequency and so do not significantly diminish the energy efficiency of the lamp.

摘要翻译： 一种无电极灯的波导结构包括用于寄生RF信号调谐吸收剂。 一种灯波导与积分频率选择性衰减包括在波导内定位以吸收杂散出的带外RF能量共振吸收剂。 所述吸收剂具有在使用中的灯来激发等离子体所选择的频率上的能量的影响可以忽略。 在第一实施例中，一个或多个薄的有损磁性材料的板坯固定到波导的侧壁以约杂散信号的四分之一波长从在波导的端壁上。 有损耗材料的定位优化功率的吸收从寄生信号。 在第二实施例中，一个或多个薄的有损耗的磁性材料的板坯与带阻波导滤波器元件结合使用。 在第三个实施方式，一个或多个微带滤波器元件被调谐到伪信号的频率和波导耦合内并吸收杂散信号的能量。 所有三个实施例在所选择的频率可以忽略的吸收能量，所以不显着降低了灯的能量效率。