US 7,405,520 B2
Curved lamp manufacturing method, curved lamp, and backlight unit
Hironobu Ueno, Takaishi (Japan); Takaharu Yanata, Ibaraki (Japan); Hayato Kameyama, Takatsuki (Japan); Yoshimitsu Mino, Souraku-gun (Japan); and Akio Kikuchi, Hirakata (Japan)
Assigned to Matsushita Electric Industrial Co., Ltd., Osaka (Japan)
Filed on Mar. 18, 2005, as Appl. No. 11/84,674.
Claims priority of application No. 2004-083635 (JP), filed on Mar. 22, 2004; application No. 2004-096767 (JP), filed on Mar. 29, 2004; and application No. 2004-100958 (JP), filed on Mar. 30, 2004.
Prior Publication US 2005/0231942 A1, Oct. 20, 2005
Int. Cl. H01J 63/04 (2006.01); H01J 9/00 (2006.01)
U.S. Cl. 313—634  [313/493] 6 Claims
OG exemplary drawing
 
1. A curved lamp having at least one curved portion, the curved lamp being generated by heating and curving a straight glass tube that was sealed with inside thereof being under reduced pressure, wherein
outer diameter of the straight glass tube ranges from 1.8 mm to 6.5 mm inclusive, thickness of the straight glass tube ranges from 0.2 mm to 0.6 mm inclusive, and curvature radius of an inner side of the curved portion is equal to or larger than 0.5 mm and smaller than 4.0 mm.