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:
Mar. 27, 2007
Filed:
May. 25, 2005
Jun Ujita, Satsumasendai, JP;
Kazuhide Kusano, Satsumasendai, JP;
Shunji Mikaki, Satsumasendai, JP;
Kyocera Corporation, Kyoto, JP;
Abstract
The present invention provides sliding members respectively having sliding surfaces opposed to each other for creating dynamic pressure in a fluid, in which the sliding surfaces are formed of ceramics containing crystal grains of AlO, crystal grains of TiC contained in the crystal grains of AlO, and crystal grains of TiC existing independently of the crystal grains of AlO, and having a TiC content of 5 to 20 mass % in the total amount of AlOand TiC, and the respective volume resistivity values Rand Rof the ceramics forming the sliding surfaces are within a range simultaneously satisfying equations (1) to (3) to prevent spark discharges from being induced between the sliding surfaces, and a fluid dynamic pressure bearing and a motor to which the configuration is applied:10Ω·cm<≦10Ω·cm  (1)10Ω·cm<≦10Ω·cm  (2)||≦10Ω·cm  (3)