Kabushiki Kaisha Toshiba

Toshiba Materials Co., Ltd.

Toshiaki Suto

Fumihiko Yoshimura

Tsutomu Morioka

This invention provides a sintered electrode for a cold cathode tube in a cylindrical form having a bottom part on one end and an opening part on the other end, characterized in that a lead-in wire is joined integrally to the bottom part and a requirement of d/d1 is satisfied wherein drepresents the density of the sintered electrode; and drepresents the density of the lead-in wire. According to the sintered electrode for a cold cathode tube, the bonding strength between the sintered electrode and the lead-in wire is high, and the handleability is good. The main component of the sintered electrode is particularly preferably identical to the main component of the lead-in wire. Enhancing the density of the lead-in wire can contribute to a further improvement, for example, in reliability.

Sintered electrode for cold cathode tube, and cold cathode tube and liquid crystal display device using the sintered electrode

An electrode () for cold cathode tube of the present invention includes a cylindrical sidewall portion (), a bottom portion () provided at one end of the cylindrical sidewall portion, and an opening portion () provided at the other end of the cylindrical sidewall portion. The electrode is formed of a sintered body of a high melting point metal (W, Nb, Ta, Mo or Re). When an overall length of the electrode is L, an inside diameter of the cylindrical sidewall portion at a position of L/2 is d, an inside diameter of the bottom portion is d, and an arc of an inner surface () of the cylindrical sidewall portion connecting a portion of the inside diameter dand a portion of the inside diameter dis R, the electrode satisfies the following condition; L&#x2267;6 [mm], d&#x3e;d, R&#x2267;20 [mm].

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Yokohama, Japan

Toshiaki Suto