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:
May. 12, 2015
Filed:
Feb. 13, 2013
Kabushiki Kaisha Toshiba, Tokyo, JP;
Toshiba Materials Co., Ltd., Yokohama-Shi, JP;
Kabushiki Kaisha Toshiba, Minato-ku, JP;
Toshiba Materials Co., Ltd., Yokohama-Shi, JP;
Abstract
A highly durable cathode component for a discharge lamp is provided. A cathode component for a discharge lamp includes a barrel having a wire diameter of 2 to 35 mm and a tapered front end, wherein the cathode component comprises a tungsten alloy containing 0.5 to 3% by weight, in terms of oxide (ThO), of a thorium component, not less than 90% of tungsten crystals are accounted for by tungsten crystals having a grain size in the range of 1 to 80 μm, as observed in terms of an area ratio of 300 μm×300 μm in unit area in a circumferential cross section of the barrel, and are accounted for by tungsten crystals having a grain size in the range of 10 to 120 μm, as observed in terms of an area ratio of 300 μm×300 μm in unit area in a side cross section of the barrel.