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:
Nov. 26, 1996
Filed:
Jan. 23, 1995
Naohisa Osaka, Oume, JP;
Toru Kobayashi, Hidaka, JP;
Rigaku Corporation, Tokyo, JP;
Abstract
A rotating-anode X-ray tube has a rotary pipe rotatably supported in a casing, and a target which is fixed to one end of the rotary pipe and can rotate along with the rotary pipe, the target being cooled by a flow of cooling fluid. A cooling-fluid sealing device is provided between the casing and the rotary pipe and is a mechanical seal. The mechanical seal has a rotary ring which is rotatable along with the rotary pipe and axially movable, a stationary ring fixed to the casing, and pressing means for pressing the rotary ring against the stationary ring. The rotary and the stationary rings come into surface contact with each other within a plane perpendicular to an axis of rotation. The rotary ring is made of carbon and the stationary ring is made of silicon carbide ceramics, both materials being electrically conductive.