US 7,321,190 B2
Low-pressure mercury lamp having a spiral arc tube and method for assembling the same
Akiko Nakanishi, Takatsuki (Japan); Yoshinori Kakuno, Katano (Japan); Shiro Iida, Kyoto (Japan); and Kenji Itaya, Takatsuki (Japan)
Assigned to Matsushita Electric Industrial Co., Ltd., Osaka (Japan)
Appl. No. 10/520,859
PCT Filed Jul. 22, 2003, PCT No. PCT/JP03/09234
§ 371(c)(1), (2), (4) Date Oct. 03, 2005,
PCT Pub. No. WO2004/010460, PCT Pub. Date Jan. 29, 2004.
Claims priority of application No. 2002-212911 (JP), filed on Jul. 22, 2002.
Prior Publication US 2006/0108908 A1, May 25, 2006
Int. Cl. H01J 5/00 (2006.01)
U.S. Cl. 313—318.02  [313/317; 313/318.01] 14 Claims
OG exemplary drawing
 
1. A low-pressure mercury lamp, comprising:
an arc tube whose at least one end is wound around an axis entirely in a longitudinal direction thereof; and
a holding member that holds the arc tube in a state where the at least one end is inserted in an opening formed in a bottom wall of the holding member,
wherein the holding member includes a groove that is at a position corresponding to a position of the at least one end and is continuous to the opening, and
the groove is formed such that the at least one end of the arc tube wound around the axis fits therein and a depth thereof increases as a distance from the opening decreases.