(19)
(11) EP 0 389 717 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
24.04.1991 Bulletin 1991/17

(43) Date of publication A2:
03.10.1990 Bulletin 1990/40

(21) Application number: 89312420.6

(22) Date of filing: 29.11.1989
(51) International Patent Classification (IPC)5: H01J 61/35, H01J 61/40, C03C 17/25
(84) Designated Contracting States:
DE GB NL

(30) Priority: 28.03.1989 JP 73874/89

(71) Applicant: SUMITOMO OSAKA CEMENT CO., LTD.
Chiyoda-ku, Tokyo (JP)

(72) Inventors:
  • Saito, Kanehiro
    Chiba-shi Chiba (JP)
  • Saito, Mitsumasa
    Narashino-shi Chiba (JP)

(74) Representative: Stuart, Ian Alexander et al
MEWBURN ELLIS York House 23 Kingsway
London WC2B 6HP
London WC2B 6HP (GB)


(56) References cited: : 
   
       


    (54) Ultraviolet ray-shielding tube


    (57) Disclosed is an ultraviolet ray-shielding agent for selectively shielding ultraviolet rays while allowing a transmission of visible rays therethrough, comprising a visible ray-transmitting binder and extremely fine zinc oxide particles having an average size of 0.1 µm or less in a mixing ratio of the zinc oxide particles to the binder of 1/10 to 10/1, and an ultraviolet ray-shielding tube for visible ray-irradiation luminescent lamps comprising a transparent substrate tube for sealing a light emission source therein, and a coating formed on a surface of the substrate tube and comprising the above-­mentioned ultraviolet ray-shielding agent.







    Search report