Electric lamp and discharge devices: systems – Discharge device load
Reexamination Certificate
2006-03-28
2009-06-09
Owens, Douglas W (Department: 2821)
Electric lamp and discharge devices: systems
Discharge device load
Reexamination Certificate
active
07545107
ABSTRACT:
There is provided an electrodeless discharge lamp lighting device with small size and low cost by simplifying a noise suppression part and a lighting apparatus having the electrodeless discharge lamp lighting device. A counter circuit of a frequency signal generating circuit repeatedly generates a frequency signal of which the amplitude is varied in a multi-step shape on the basis of an oscillation period of an oscillation circuit. An oscillation circuit outputs an oscillation signal of a frequency corresponding to the amplitude of the frequency signal. A drive circuit drives a switching element of an inverter circuit at the frequency of the oscillation signal and the inverter circuit applies a high-frequency voltage generated by the switching operation of the switching element to an induction coil to start up and light the electrodeless discharge lamp. That is, a high-frequency voltage which is varied at three discrete frequencies f1, f2, and f3is repeatedly and periodically applied to the induction coil and thus a magnetic-component noise generated from a discharge lamp lighting device is distributed into three frequency components.
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Kido Hiroshi
Nakajo Akira
Yamamoto Shohei
Chen Jianzi
Greenblum & Bernstein P.L.C.
Owens Douglas W
Panasonic Electric Works Co., Ltd.
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