(19)
(11) EP 2 190 005 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
11.07.2012 Bulletin 2012/28

(43) Date of publication A2:
26.05.2010 Bulletin 2010/21

(21) Application number: 09176841.6

(22) Date of filing: 24.11.2009
(51) International Patent Classification (IPC): 
H01J 61/30(2006.01)
H01J 61/82(2006.01)
 H01J 61/33(2006.01)
(84) Designated Contracting States:
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO SE SI SK SM TR
Designated Extension States:
AL BA RS

(30) Priority: 25.11.2008 JP 2008299767

(71) Applicant: NGK Insulators, Ltd.
Nagoya-city, Aichi 467-8530 (JP)

(72) Inventor:
  • Watanabe, Keiichiro
    Nagoya-city Aichi 467-8530 (JP)

(74) Representative: TBK 
Bavariaring 4-6
80336 München
80336 München (DE)

   


(54) Light-emitting container for high-intensity discharge lamp and high-intensity discharge lamp


(57) A light-emitting container 5A for a high-intensity discharge lamp has an arc tube comprising a translucent polycrystalline ceramics. The arc tube has a central light-emitting portion 2 and side end portions 3 provided on both sides of the central light-emitting portion 2, respectively, and tubular portions 1 protruding from both of the side end portions, respectively. The inner surfaces of the side end portions are roughened surfaces.







Search report









Search report