Indirectly heated electrode for gas discharge tube, gas discharge tube using said indirectly heated electrode, and lighting device for said gas discharge tube

A gas discharge tube comprising:

• a container;
• and
• a pair of indirectly heated electrodes are sealed in an airtight manner in the container,
• wherein each of the indirectly heated electrodes comprises:
• a coil member, having a mandrel and wound in coil form;
• a heater, disposed at the inner side of the coil member and having an electrical insulating layer formed on a surface thereof;
• a high-melting-point metal, formed to a mesh and disposed along the length direction of the coil member at the outer side of the coil member;
• and
• a metal oxide, serving as a material likely to emit electrons and disposed so as to be in contact with the coil member;
• and
• wherein a pair of the indirectly heated electrodes are sealed such that the high-melting-point metals oppose each other.

A gas discharge tube comprising:

• a container;
• and
• a pair of indirectly heated electrodes are sealed in an airtight manner in the container,
• wherein each of the indirectly heated electrodes comprises:
• a coil member, wound in coil form;
• a heater, disposed at the inner side of the coil member and having an electrical insulating layer formed on a surface thereof;
• a high-melting-point metal, formed to a mesh and disposed along the length direction of the coil member at the outer side of the coil member;
• and
• a metal oxide, serving as a material likely to emit electrons and held by the coil member so as to be in contact with the high-melting-point metal;
• and
• wherein the high-melting-point metal is in electrical contact with the coil member at a plurality of locations;
• and
• wherein a pair of the indirectly heated electrodes are sealed such that the high-melting-point metals oppose each other.

A gas discharge tube comprising:

• a container;
• and
• a pair of indirectly heated electrodes are sealed in an airtight manner in the container,
• wherein each of the indirectly heated electrodes comprises:
• a coil member, wound in coil form;
• a heater, disposed at the inner side of the coil member and having an electrical insulating layer formed on a surface thereof;
• a high-melting-point metal, formed to a mesh and disposed along the length direction of the coil member at the outer side of the coil member;
• and
• a metal oxide, serving as a material likely to emit electrons and held by the coil member so as to be in contact with the coil member and the high-melting-point metal;
• and
• wherein a pair of the indirectly heated electrodes are sealed such that the high-melting-point metals oppose each other.

A gas discharge tube comprising:

• a container;
• and
• a pair of indirectly heated electrodes are sealed in an airtight manner in the container,
• wherein each of the indirectly heated electrodes comprises:
• a base metal, formed to a tubular form;
• a heater, disposed at the inner side of the base metal and having an electrical insulating layer formed on a surface thereof;
• a coil member, wound in coil form around the outer side of the base metal;
• a high-melting-point metal, formed to a mesh and disposed along the length direction of the coil member at the outer side of the coil member;
• and
• a metal oxide, serving as a material likely to emit electrons and held by the coil member so as to be in contact with the high-melting-point metal;
• and
• wherein a pair of the indirectly heated electrodes are sealed such that the high-melting-point metals oppose each other.

A gas discharge tube comprising:

• a container;
• and
• a pair of indirectly heated electrodes are sealed in an airtight manner in the container,
• wherein each of the indirectly heated electrodes comprises:
• a heater, having an electrical insulating layer formed on a surface thereof;
• a high-melting-point metal, formed to a mesh and disposed along the length direction of the heater at the outer side of the heater;
• and
• a metal oxide, serving as a material likely to emit electrons and disposed so as to be in contact with the high-melting-point metal;
• and
• wherein a pair of the indirectly heated electrodes are sealed such that the high-melting-point metals oppose each other.

A gas discharge tube comprising:

• a container;
• and
• a pair of indirectly heated electrodes are sealed in an airtight manner in the container,
• wherein each of the indirectly heated electrodes comprises:
• a heater, having an electrical insulating layer fonned on a surface thereof;
• a high-melting-point metal, formed to a mesh, extended in the length direction in a waving manner, and disposed along the length direction of the heater at the outer side of the heater;
• a conductive wire, having a shape that spans a depressed part at one side of the high-melting-point metal in one direction along the width direction of the high-melting-point metal and spans a depressed part at the other side of the high-melting-point metal in the reverse direction along the width direction of the high-melting-point metal;
• and
• a metal oxide, serving as a material likely to emit electrons and disposed so as to be in contact with the high-melting-point metal;
• and
• wherein a pair of the indirectly heated electrodes are sealed such that the high-melting- point metals oppose each other.

A gas discharge tube comprising:

• a container;
• and
• a pair of indirectly heated electrodes are sealed in an airtight manner in the container,
• wherein each of the indirectly heated electrodes comprises:
• a base metal, formed to a tubular form;
• a heater, disposed at the inner side of the base metal and having an electrical insulating layer fonned on a surface thereof;
• a high-melting-point metal, formed to a mesh and disposed on the surface of the base metal along the length direction of the heater;
• and
• a metal oxide, serving as a material likely to emit electrons and disposed so as to be in contact with the high-melting-point metal, and
• wherein a pair of the indirectly heated electrodes are sealed such that the high-melting- point metals oppose each other.

A gas discharge tube comprising:

• a container;
• and
• a pair of indirectly heated electrodes are sealed in an airtight manner in the container, wherein each of the indirectly heated electrodes comprises:
• a heater, having an electrical insulating layer formed on a surface thereof;
• an electron emitting part, emitting electrons upon receiving heat from the heater;
• and
• an electrical conductor, disposed at the surfacemost part of the electron emitting part and having a predetermined length,
• wherein the emitting part comprises:
• a metal oxide as a material likely to emit electrons;
• and a coil member, holding the metal oxide;
• and
• wherein the coil member is a multiple coil arranged by winding a coil having a mandrel in coil form.

A gas discharge tube comprising:

• a container;
• and
• a pair of indirectly heated electrodes are sealed in an airtight manner in the container,
• wherein each of the indirectly heated electrodes comprises:
• a multiple coil member, arranged by winding a coil having a mandrel in coil form;
• a heater, disposed at the inner side of the multiple coil member and having an electrical insulating layer formed on a surface thereof;
• a high-melting-point metal, formed to a mesh and disposed along the length direction of the multiple coil member at the outer side of the multiple coil member;
• and
• a metal oxide, serving as a material likely to emit electrons and disposed so as to be in contact with the multiple coil member and the high-melting-point metal;
• and
• wherein a pair of the indirectly heated electrodes are sealed such that the high-melting- point metals oppose each other.

A gas discharge tube comprising:

• a container;
• and
• a pair of indirectly heated electrodes are sealed in an airtight manner in the container,
• wherein each of the indirectly heated electrodes comprises:
• a multiple coil member, arranged by winding a coil having a mandrel in coil form;
• a heater, disposed at the inner side of the multiple coil member and having an electrical insulating layer formed on a surface thereof;
• a high-melting-point metal, formed to a wire or a plate and disposed along the length direction of the multiple coil member at the outer side of the multiple coil member;
• and
• a metal oxide, serving as a material likely to emit electrons and disposed so as to be in contact with the multiple coil member and the high-melting-point metal;
• and
• wherein a pair of the indirectly heated electrodes are sealed such that the high-melting- point metals oppose each other.