(19)
(11) EP 1 881 743 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
28.04.2010 Bulletin 2010/17

(43) Date of publication A2:
23.01.2008 Bulletin 2008/04

(21) Application number: 07013491.1

(22) Date of filing: 10.07.2007
(51) International Patent Classification (IPC): 
H05B 33/08(2006.01)
 H05B 37/03(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 MT NL PL PT RO SE SI SK TR
Designated Extension States:
AL BA HR MK RS

(30) Priority: 10.07.2006 JP 2006189881

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

(72) Inventors:
  • Keiichi, Shimizu
    Tokyo (JP)
  • Sumio, Hashimoto
    Tokyo (JP)
  • Keisuke, Ono
    Tokyo (JP)
  • Mitsuhiko, Nishiie
    Tokyo (JP)
  • Takayoshi, Moriyama
    Tokyo (JP)
  • Takuro, Hiramatsu
    Tokyo (JP)
  • Akiko, Nakanishi
    Tokyo (JP)
  • Masahiro, Toda
    Tokyo (JP)
  • Kazunari, Higuchi
    Tokyo (JP)

(74) Representative: Arth, Hans-Lothar et al
ABK Patent Attorneys Jasminweg 9
14052 Berlin
14052 Berlin (DE)

   


(54) Lighting apparatus


(57) A lighting apparatus is provided, which has a not lowered light output and a long life even service time is prolonged. The lighting apparatus includes a light source having a phosphor and a resin including the phosphor, and having a characteristic that as a provided electric power is increased, a decreased rate of a lumen maintenance factor is increased, and an electric-to-optical conversion efficiency is reduced; a radiation element, directly or indirectly disposed on the light source; a power source, capable of changing the electric power supplied to the light source; and a controller, reducing the electric power provided to the light source at an initial period, and making the provided electric power increase as a function of time.







Search report