Login| Sign Up| Help| Contact|

Patent Searching and Data

Document Type and Number:
WIPO Patent Application WO/2008/018558
Kind Code:
A compact fluorescent lamp not inviting an increase of the size of the chalk coil and leading to power saving. A compact fluorescent lamp comprises a luminescent tube having a glass tube constituting a one electric discharge path and electrodes sealed in both ends of the glass tube and an operating unit for operating the luminescent tube. The operating unit has a rectifying/smoothing circuit, an inverter circuit for switching the output from the rectifying/smoothing circuit and applying high-frequency power to the luminescent tube, and a resonance circuit using a chalk coil connected in series to the luminescent tube so as to permit the luminescent tube to emit light with a luminance almost equal to that of 60W incandescent lamp. The impedance of the luminescent tube during the normal operation is set in a range from 1.0 kΩ to 3.0 kΩ. The chalk coil is formed of a copper wire having a cross section of from 0.02 mm2 to 0.03 mm2.

TSUNETO, Yuji (())
恒藤 祐二 (())
Application Number:
Publication Date:
February 14, 2008
Filing Date:
August 09, 2007
Export Citation:
Click for automatic bibliography generation   Help
MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD. (1006, Oaza Kadoma Kadoma-sh, Osaka 01, 5718501, JP)
松下電器産業株式会社 (〒01 大阪府門真市大字門真1006番地 Osaka, 5718501, JP)
TSUNETO, Yuji (())
International Classes:
H05B41/24; F21S2/00; F21V23/02; H01F27/28; H05B41/02; F21Y103/02
Attorney, Agent or Firm:
NAKAJIMA, Shiro et al. (6F Yodogawa 5-Bankan, 2-1 Toyosaki 3-chome,Kita-ku, Osaka-sh, Osaka 72, 5310072, JP)
Download PDF: