EP 2117031 A1 20091111 - COMPACT-TYPE FLUORESCENT LAMP
Title (en)
COMPACT-TYPE FLUORESCENT LAMP
Title (de)
KOMPAKTE FLUORESZIERENDE LEUCHTE
Title (fr)
LAMPE FLUORESCENTE DE TYPE COMPACT
Publication
Application
Priority
- JP 2008053257 W 20080226
- JP 2007049082 A 20070228
- JP 2007048672 A 20070228
Abstract (en)
It is an object to provide a compact-type fluorescent lamp having eight or more tubes using liquid mercury in which a part serving as a coldest point which is at about 50°C upon lighting is created in a luminous tube distal end portion, and the temperature in the vicinity of a base can be reduced. In a compact-type fluorescent lamp in which a luminous tube is composed of eight or more U-shaped tubes and the mercury vapor pressure is not regulated, the cross section of a vertex portion of at least one of the U-shaped tubes has a shape in which a wide portion is present near a diverging portion of the U-shaped tube, and the shape is tapered from the wide portion toward a distal end portion of the vertex portion; a tube axial-direction inner size L1 of the vertex portion meets the expression, 11 ‰¤ L ¢ 1 ‰¤ 17 unit is mm and a tube axial-direction size L2 from the wide portion in the vicinity of the diverging portion of the U-shaped tube to the distal end portion of the vertex portion meets the expression, L ¢ 1 - 7 ‰¤ L ¢ 2 ‰¤ L ¢ 1 - 2 unit is mm
IPC 8 full level
H01J 61/32 (2006.01); H01J 5/50 (2006.01); H01J 61/30 (2006.01)
CPC (source: EP)
H01J 61/327 (2013.01); H01J 61/33 (2013.01)
Citation (search report)
See references of WO 2008105394A1
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MT NL NO PL PT RO SE SI SK TR
DOCDB simple family (publication)
DOCDB simple family (application)
EP 08711981 A 20080226; JP 2008053257 W 20080226