Electrode for discharge tube, and discharge tube using it
First Claim
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1. 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.
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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.
6 Citations
9 Claims
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1. 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. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9)
wherein at least one of said cathode and said anode is the discharge tube electrode as set forth in claim 1 or 2.
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2. 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.
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Specification
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Current AssigneeHamamatsu Photonics KK
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Original AssigneeHamamatsu Photonics KK
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InventorsHarada, Nobuharu, Ishihara, Syoji
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Primary Examiner(s)Patel, Vip
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Assistant Examiner(s)BERCK, KENNETH A
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Application NumberUS09/912,384Publication NumberTime in Patent Office873 DaysField of Search313/631, 313/632, 313/331, 313/333, 313/283, 313/481, 313/336, 313/332, 313/326, 313/620, 313/623, 313/628, 313/625, 445/26, 445/23US Class Current313/631CPC Class CodesH01J 17/06 CathodesH01J 61/0732 characterised by the constr...
