(19)
(11) EP 1 798 754 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
04.07.2012 Bulletin 2012/27

(43) Date of publication A2:
20.06.2007 Bulletin 2007/25

(21) Application number: 06256403.4

(22) Date of filing: 15.12.2006
(51) International Patent Classification (IPC): 
H01J 61/35(2006.01)
 H01J 61/72(2006.01)
(84) Designated Contracting States:
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR
Designated Extension States:
AL BA HR MK RS

(30) Priority: 16.12.2005 JP 2005363550
13.06.2006 JP 2006163923

(71) Applicant: Toshiba Lighting & Technology Corporation
Shinagawa-ku, Tokyo 140-8640 (JP)

(72) Inventors:
  • Nishimura, Kiyoshi, Toshiba Lighting & Tech. Corp
    Tokyo 140-8640 (JP)
  • Otani, Kiyoshi, Toshiba Lighting & Tech. Corp
    Tokyo 140-8640 (JP)
  • Watanabe, Miho, Toshiba Lighting & Tech. Corp
    Tokyo 140-8640 (JP)
  • Naoki, Shoji, Toshiba Lighting & Tech. Corp
    Tokyo 140-8640 (JP)
  • Nakamura, Mitsunori, Toshiba Light & Tech. Corp
    Tokyo 140-8640 (JP)
  • Yoshida, Masahiko, Toshiba Light & Tech. Corp
    Tokyo 140-8640 (JP)

(74) Representative: Jennings, Nigel Robin et al
Kilburn & Strode LLP 20 Red Lion Street
London WC1R 4PJ
London WC1R 4PJ (GB)

   


(54) Fluorescent lamp comprising a protective film, and lighting fixture therewith


(57) There is provided a fluorescent lamp (10) comprising a glass tube (1) filled therein with an electric discharging medium, a protective film (4) formed on an inner surface of the glass tube, a phosphor layer (5) formed on an upper surface of the protective film, and electrode means (3) attached to the glass tube. The protective film comprises, as a major component, SiO2 fine particles exhibiting not more than 0.3 at a temperature of 600°C in integrated value of absorbance spectrum of hydroxyl group absorption band in wave number ranging from 2500-3800 cm-1 as measured by infrared spectroscopy on the assumption that the integrated value of absorbance spectrum of hydroxyl group absorption band at a temperature of 100°C is 1.
Alternatively, the SiO2 fine particles contain carbon at a content confined within the range of 0.09% to 0.3% by mass.
Alternatively, the SiO2 fine particles exhibit a spectrum having peaks at a wave number ranging from 590 to 610 cm-1 and at a wave number ranging from 490 to 500 cm-1 as measured by laser Raman spectroscopy and at a temperature of 700°C.







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