Electrode for discharge tube, and discharge tube using it
AssigneeHamamatsu Photonics K.K.
InventorsNobuharu Harada, Syoji Ishihara
Life of this patent
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Abstract
A discharge tube is comprised of a glass bulb, a cathode, and an anode. Impregnating porous tungsten with barium makes the cathode tip portion. A clearance between the end face of a lead rod and the end face of the cathode tip portion is filled with a molybdenum-ruthenium brazing filler metal.
Claims9
A discharge tube electrode used in a discharge tube in which a cathode and an anode are included opposite to each other in a discharge gas atmosphere and in which arc discharge is induced between the cathode and the anode,
- the electrode comprising:
- a base section made of a refractory metal and having an end face provided with a projection;
- and
- a main body made of a refractory metal containing an electron-emitting substance, having a cusp at one end thereof;
- and having an end face provided with an insert hole to accommodate said projection of said base section, at another end,
- wherein a clearance between said end face of said base section and said main body is sealed with a brazing filler metal, and
- wherein said end face of said base section is larger than said end face of said main body.
A discharge tube electrode used in a discharge tube in which a cathode and an anode are included opposite to each other in a discharge gas atmosphere and in which arc discharge is induced between the cathode and the anode,
- the electrode comprising:
- a base section made of a refractory metal and having an end face provided with a projection;
- and
- a main body made of a refractory metal containing an electron-emitting substance, having a cusp at one end thereof;
- and having an end face provided with an insert hole to accommodate said projection of said base section, at another end,
- wherein a clearance between said end face of said base section and said end face of said main body is sealed with a brazing filler metal, and
- wherein said brazing filler metal is provided so as to extend from said clearance to a side face of said main body.
Dependencies are inferred from the claim text.