Title:
TUNSTEN WIRE, CATHODE HEATER, AND FILAMENT FOR VIBRATION SERVICE LAMP
Document Type and Number:
WIPO Patent Application WO/2003/031668
Kind Code:
A1
Abstract:
A tungsten wire containing 1−10 mass% of rhenium, characterized in that the point showing 2% expansion of a heated tungsten wire having a diameter of x µm and heated by application of a current of which the ratio to the fusing current (FC) of the tungsten wire of x µm diameter is y% is within the quadrilateral defined by connecting point (20, 75), point (20, 87), point (90, 75), and point (90, 58) by straight lines in a semilogarithmic coordinate system in which point (x, y) is shown, of which the horizontal axis is marked with a logarithmic scale of diameter x, and of which the vertical axis is marked with an ordinary scale of the ratio y to the fusing current. The tungsten wire expands greatly even under high−temperature condition, exhibits excellent durability when used as a constituent material of, e.g., a cathode heater and can be produced efficiently.
Inventors:
Tanaka, Takashi (1-36-13-906, Takada Toshima-Ku, Tokyo, 171-0033, JP)
Sakai, Motohisa (277-1, Shiba-Machi Kanazawa-K, Yokohama-Shi Kanagawa, 236-0012, JP)
Nakano, Yasuhiko (1-8-12-504, Mori Isogo-K, Yokohama-Shi Kanagawa, 235-0023, JP)
Suganomata, Kan (1030-31, Daigiri Fujisawa-Shi, Kanagawa, 251-0002, JP)
Esaki, Motoaki (1-9-12, Iwato Yokosuka-Shi, Kanagawa, 239-0844, JP)
Nakano, Kayo (1-8-12-504, Mori Isogo-K, Yokohama-Shi Kanagawa, 235-0023, JP)
Sakai, Motohisa (277-1, Shiba-Machi Kanazawa-K, Yokohama-Shi Kanagawa, 236-0012, JP)
Nakano, Yasuhiko (1-8-12-504, Mori Isogo-K, Yokohama-Shi Kanagawa, 235-0023, JP)
Suganomata, Kan (1030-31, Daigiri Fujisawa-Shi, Kanagawa, 251-0002, JP)
Esaki, Motoaki (1-9-12, Iwato Yokosuka-Shi, Kanagawa, 239-0844, JP)
Nakano, Kayo (1-8-12-504, Mori Isogo-K, Yokohama-Shi Kanagawa, 235-0023, JP)
Application Number:
PCT/JP2002/010474
Publication Date:
April 17, 2003
Filing Date:
October 09, 2002
Export Citation:
Assignee:
KABUSHIKI KAISHA TOSHIBA (1-1 Shibaura 1-Chome, Minato-Ku, Tokyo, 105-8001, JP)
Tanaka, Takashi (1-36-13-906, Takada Toshima-Ku, Tokyo, 171-0033, JP)
Sakai, Motohisa (277-1, Shiba-Machi Kanazawa-K, Yokohama-Shi Kanagawa, 236-0012, JP)
Nakano, Yasuhiko (1-8-12-504, Mori Isogo-K, Yokohama-Shi Kanagawa, 235-0023, JP)
Suganomata, Kan (1030-31, Daigiri Fujisawa-Shi, Kanagawa, 251-0002, JP)
Esaki, Motoaki (1-9-12, Iwato Yokosuka-Shi, Kanagawa, 239-0844, JP)
Nakano, Kayo (1-8-12-504, Mori Isogo-K, Yokohama-Shi Kanagawa, 235-0023, JP)
Tanaka, Takashi (1-36-13-906, Takada Toshima-Ku, Tokyo, 171-0033, JP)
Sakai, Motohisa (277-1, Shiba-Machi Kanazawa-K, Yokohama-Shi Kanagawa, 236-0012, JP)
Nakano, Yasuhiko (1-8-12-504, Mori Isogo-K, Yokohama-Shi Kanagawa, 235-0023, JP)
Suganomata, Kan (1030-31, Daigiri Fujisawa-Shi, Kanagawa, 251-0002, JP)
Esaki, Motoaki (1-9-12, Iwato Yokosuka-Shi, Kanagawa, 239-0844, JP)
Nakano, Kayo (1-8-12-504, Mori Isogo-K, Yokohama-Shi Kanagawa, 235-0023, JP)
International Classes:
B21C1/00; B21C37/04; B22F5/12; C22C1/04; C22C27/04; H01J1/14; H01J1/146; H01J1/22; H01J9/04; H01J9/08; H01K1/02; H01K3/02; B21B1/18; B21B3/00; B21B15/00; (IPC1-7): C22C27/04; B21J5/06; H01J35/06
Attorney, Agent or Firm:
Hatano, Hisashi (Tokyo International Patent Firm, 2nd Floor Miyata Building, 17-16,
Nishi-Shimbashi 1-Chom, Minato-Ku Tokyo, 105-0003, JP)
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