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:
Oct. 02, 2012
Filed:
Sep. 08, 2010
Sugio Miyazawa, Kasugai, JP;
Keiichiro Watanabe, Kasugai, JP;
Tsuneaki Ohashi, Nagoya, JP;
Hisanori Yamamoto, Komaki, JP;
Sugio Miyazawa, Kasugai, JP;
Keiichiro Watanabe, Kasugai, JP;
Tsuneaki Ohashi, Nagoya, JP;
Hisanori Yamamoto, Komaki, JP;
NGK Insulators, Ltd., Nagoya, JP;
Abstract
A translucent polycrystalline sintered body is mainly composed of an alumina, is suitable for the manufacture of an arc tube for a high-intensity discharge lamp, and has an average grain diameter of 35 to 70 μm, preferably 50 to 60 μm. In a case where the sintered body is in a 0.5-mm-thick flat plate shape, the in-line transmittance of the sintered body is 30% or more, preferably 50% or more. In this case, the ratio between maximum and minimum in-line transmittance values is 2:1 to 1:1 in the visible region of 360 to 830 nm. The bending strength of the sintered body is 250 MPa or more, preferably 300 MPa or more.