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Gas discharge tube with discharge shielding member

  • US 5,633,563 A
  • Filed: 07/13/1995
  • Issued: 05/27/1997
  • Est. Priority Date: 08/31/1994
  • Status: Expired due to Term
First Claim
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1. A gas discharge tube, comprising:

  • an envelope for sealing a gas therein;

    a hot cathode disposed in said envelope, for emitting thermoelectrons;

    an anode disposed in said envelope, for receiving the thermoelectrons emitted from said hot cathode;

    a focusing electrode disposed in said envelope, said focusing electrode having a focusing opening for converging and passing thermoelectrons which are emitted from said hot cathode and which are received by said anode; and

    a discharge shielding member of an insulator having a front surface for supporting said focusing electrode at a predetermined position, said front surface of said discharge shielding member being defined by;

    a first surface being in direct contact with said focusing electrode, for defining a position of said focusing electrode;

    a second surface continued from said first surface, for defining a distance between said focusing electrode and said anode; and

    a third surface continued from said second surface, said third surface being in direct contact with said anode, for defining a position of said anode,wherein said second and third surfaces of said front surface of said discharge shielding member form a first depression for supporting and accommodating said anode.

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