Indirectly heated electrode for gas discharge tube
AssigneeHamamatsu Photonics K. K.
InventorKoji Kawai
Life of this patent
Estimating the term…
Abstract
An indirectly heated cathode for gas discharge tube C1 comprises a heater 1, a double coil 2, a plate member 3, and a metal oxide 10. An electrical insulating layer 4 is formed on the surface of heater 1. Heater 1 is disposed at the inner side of double coil 2. Plate member 3 is disposed along the length direction of double coil 2 at the inner side of double coil 2, which is to be the discharge surface side, and is electrically connected to double coil 2. Also, plate member 3 is grounded by being connected to the ground terminal of heater 1. Metal oxide 10 is held by double coil 2 and disposed to be in contact with plate member 3. Metal oxide 10 is in contact with double coil 2.
Claims7
An indirectly heated electrode for gas discharge tube comprising:
- a coil member, wound in coil form;
- a heater, disposed at the inner side of said coil member and having an electrical insulating layer formed on a surface thereof;
- a metal oxide, serving as a material likely to emit electrons and held by said coil member;
- and
- an electrical conductor, having a predetermined length and disposed at the inner side of said coil member so as to be in contact with said coil member,
- wherein said metal oxide contacts said heater via said electrical insulating layer, and
- wherein said coil member is a multiple coil arranged by winding a coil having a mandrel in coil form, the mandrel having a cross section and the coil member being wound contiguously about the mandrel so as to define an inside shape that corresponds to the cross section of the mandrel.
An indirectly heated electrode for gas discharge tube comprising:
- a coil member, having a mandrel and wound in coil form, the mandrel having a cross section and the coil member being wound contiguously about the mandrel so as to define an inside shape that corresponds to the cross section of the mandrel;
- a heater, disposed at the inner side of said coil member and having an electrical insulating layer formed on a surface thereof;
- a high-melting-point metal, formed to a mesh, a wire, or a plate and disposed along the length direction of said coil member between said coil member and said heater;
- and
- a metal oxide, serving as a material likely to emit electrons and disposed so as to be in contact with said coil member;
- and
- wherein said high-melting-point metal is in electrical contact with said coil member at a plurality of locations and said coil member is grounded.
An indirectly heated electrode for gas discharge tube comprising:
- a coil member, having a mandrel and wound in coil form, the mandrel having a cross section and the coil member being wound contiguously about the mandrel so as to define an inside shape that corresponds to the cross section of the mandrel;
- a heater, disposed at the inner side of said coil member and having an electrical insulating layer formed on a surface thereof;
- a high-melting-point metal, formed to a mesh, a wire, or a plate and disposed along the length direction of said coil member between said coil member and said heater;
- and
- a metal oxide, serving as a material likely to emit electrons and disposed so as to be in contact with said coil member;
- and
- wherein said high-melting-point metal is in electrical contact with said coil member at a plurality of locations and said high-melting-point metal is grounded.
Dependencies are inferred from the claim text.