......DE....FRGB........NL........................R0253316EUROPEAN PATENT APPLICATIONA319900321EP87109938.819870709enenen108595/86 U19860715JP108597/86 U19860715JP108598/86 U19860715JP19900321199012198801201988034 4H 01J 61/06 AdeEntladungslampe mit kalter ElektrodeenCold cathode type discharge lamp apparatusfrLampe à décharge à cathode froideTDK Corporation00224160TD 4/87 EUP13-1, Nihonbashi 1-chomeChuo-ku, Tokyo-to 103JPMITSUBISHI DENKI KABUSHIKI KAISHA00208580TD 4/87 EUP2-3, Marunouchi 2-chome Chiyoda-kuTokyo 100JPIwaya, ShouichiTDK Corporation 13-1 Nihonbashi 1-chomeChuo-ku TokyoJPMasumura, HitoshiTDK Corporation 13-1 Nihonbashi 1-chomeChuo-ku TokyoJPHamada, MunemitsuTDK Corporation 13-1 Nihonbashi 1-chomeChuo-ku TokyoJPAdachi, Hiromi Ohfuna SeisakushoMITSUBISHI DENKI KABUSHIKIGAISHA 1-1Ohfuna 5-chome Kamakura-shi Kanagawa-kenJPSteinmann, Otto C.et al00151220Kanzlei Dres. Münich, Neidl-Stippler, Schiller, Willibaldstr.36/38D-80689 MünchenDEDEFRGBNL19900321199012

A cold cathode type discharge lamp apparatus of the invention is composed of a discharge lamp tube, a cathode electrode member in nearly cylindrical form made of a semiconductor porcelain and including an apex made a discharge surface, a sealing support member for sealing and supporting the cathode electrode member within the tube, and a lead wire connected to the cathode electrode member. In such discharge lamp apparatus, since an electron emission material is not used in the cathode electrode but the semiconductor porcelain is used, chemical reaction due to heating is not used, thereby blackening of the light emission tube is prevented and the life becomes long.