The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 09, 2001
Filed:
Nov. 17, 1994
Munemitsu Hamada, Ichikawa, JP;
Masaru Fukuda, Narita, JP;
Haruo Taguchi, Nishime-machi, JP;
Shoichi Iwaya, Kisakata-machi, JP;
Hiroaki Abe, Honjo, JP;
TDK Corporation, Tokyo, JP;
Abstract
The present invention provides an electrode for a ceramic electrode fluorescent discharge lamp; an electrode material for a discharge lamp, which has high electron flow density, high thermal shock resistance, and reduced deterioration due to sputtering; and also a method for manufacturing the same. The invention makes it possible to reduce the tube diameter of the ceramic electrode fluorescent discharge lamp. An electrode material for a discharge lamp is obtained from a first component of 0.5 to 1.5 mols of BaO, CaO or SrO, a second component of 0.05 to less than 0.3 mols or more than 0.7 to 0.95 mols of ZrO,or TiO,, and a third component of 0.025 to less than 0.3 mols of V,O,, Nb,O,, Ta,O,, Sc,O,, Y,O,, La,O,, Dy,O,, or Ho,O,, or 0.05 to less than 0.15 mols or more than 0.35 to 0.95 mols of HfO,, CrO,, MoO,or WO,. This electrode material is granulated and is turned into a massive, granular, or porous electrode material. This is placed in a cylindrical semiconductor ceramic container with a closed bottom and is reduced and fired to prepare an electrode. A mercury dispenser of the ceramic electrode fluorescent discharge lamp is disposed in series between the cylindrical semiconductor ceramic container with a closed bottom and a lead-in portion of the lead wire.