(19)
(11) EP 0 470 496 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
26.08.1992 Bulletin 1992/35

(43) Date of publication A2:
12.02.1992 Bulletin 1992/07

(21) Application number: 91112878.3

(22) Date of filing: 31.07.1991
(51) International Patent Classification (IPC)5H01K 1/32, H01K 1/02, H01K 7/02, F21V 9/04
(84) Designated Contracting States:
DE GB

(30) Priority: 07.08.1990 JP 209464/90
07.08.1990 JP 209465/90

(71) Applicant: TOSHIBA LIGHTING & TECHNOLOGY CORPORATION
Minato-ku, Tokyo-To (JP)

(72) Inventors:
  • Yuge, Yoji
    Chigasaki-shi, Kanagawa-ken (JP)
  • Tanaka, Sumiko
    Yokosuka-shi, Kanagawa-ken (JP)
  • Kawakatsu, Akira
    Kanazawa-ku, Yokohama-shi (JP)

(74) Representative: Henkel, Feiler, Hänzel & Partner 
Möhlstrasse 37
81675 München
81675 München (DE)


(56) References cited: : 
   
       


    (54) Incandescent lamp and reflector type projection lamp


    (57) reflector type projection lamp comprising an incandescent lamp (1) provided on the inner or outer surface of its bulb (2) with an interference layer for reflecting infrared light and transmitting visible light and a reflector (10) provided on its reflecting surface with an interference layer (15) for reflecting visible light and transmitting infrared light is characterized in that the bulb (2) of said incandescent lamp is either spherical or spheroidal. Of the light emitted from the filament (6) of the incandescent lamp, the infrared component is effectively reflected by an interference layer (9) on the bulb and returned to the filament to enhance the overall lighting efficiency of the lamp and reduce the rate of heat irradiated from the lamp into the atmosphere.







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