(19)
(11) EP 2 251 894 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
04.04.2012 Bulletin 2012/14

(43) Date of publication A2:
17.11.2010 Bulletin 2010/46

(21) Application number: 10161680.3

(22) Date of filing: 30.04.2010
(51) International Patent Classification (IPC): 
H01J 61/36(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 ME RS

(30) Priority: 15.05.2009 JP 2009118853
17.09.2009 JP 2009216091

(71) Applicant: Toshiba Lighting & Technology Corporation
Yokosuka-shi Kanagawa (JP)

(72) Inventors:
  • Honma, Takuya
    Yokosuka-shi Kanagawa (JP)
  • Kamata, Hiroshi
    Yokosuka-shi Kanagawa (JP)
  • Watanabe, Miho
    Yokosuka-shi Kanagawa (JP)
  • Matsuda, Ryotaro
    Yokosuka-shi Kanagawa (JP)

(74) Representative: O'Connell, David Christopher 
Haseltine Lake LLP Redcliff Quay 120 Redcliff Street
Bristol BS1 6HU
Bristol BS1 6HU (GB)

   


(54) High-pressure discharge lamp


(57) A high-pressure discharge lamp comprises a translucent ceramics airtight vessel (1) including an envelopment portion (1a) and a small-diameter cylindrical portion (1b) connected to the envelopment portion (1a) and having a sealing portion (SP). A current introducing conductor (2) is inserted in the inside of the small-diameter cylindrical portion (1b) including a sealing metal portion (2a) and a halogen-resistant portion (2b) connected each other. An electrode (3) is arranged at one end of the halogen-resistant portion (2b). The sealing portion (SP) is sealed by a fusion of melted poly-crystalline alumina ceramics of the small-diameter cylindrical portion (1b) at the sealing metal portion (2a) of the current introducing conductor (2), and the melted alumina ceramics includes aluminum grain growth control additives.







Search report