(19)
(11) EP 0 451 997 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
12.08.1992 Bulletin 1992/33

(43) Date of publication A2:
16.10.1991 Bulletin 1991/42

(21) Application number: 91302736.3

(22) Date of filing: 28.03.1991
(51) International Patent Classification (IPC)5: H01J 61/30, H01J 61/82
(84) Designated Contracting States:
DE GB

(30) Priority: 31.03.1990 JP 86487/90

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

(72) Inventors:
  • Itoh, Akira
    Yokohama-shi Kanagawa-ken (JP)
  • Okamura, Kazuyoshi
    Yokohama-shi Kanagawa-ken (JP)
  • Uchida, Kazuiki
    Fujisawa-shi Kanagawa-ken (JP)

(74) Representative: Muir, Ian R. et al
HASELTINE LAKE & CO. Hazlitt House 28 Southampton Buildings Chancery Lane
London WC2A 1AT
London WC2A 1AT (GB)


(56) References cited: : 
   
       


    (54) Metal vapor discharge lamp


    (57) A metal vapor discharge lamp including a hermetically sealed bent-shape bulb (16) made of translucent ceramic material, a pair of electrodes (20, 20) mounted in the bulb (16) through both ends of the bulb (16) end metal vapor filled in the bulb, wherein the bulb (16) has a wall load A W/cm² and an inner bulb diameter Di mm which satisfy the following two relations;






    Search report