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:
Jul. 28, 1992
Filed:
Apr. 11, 1991
Kazuhiro Oka, Amagasaki, JP;
Takeshi Morita, Amagasaki, JP;
Seigo Hiramoto, Amagasaki, JP;
Yutaka Ohhashi, Himeji, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
A distributor rotor electrode comprising an electrode head having a pair of flat surfaces substantially parallel to a plane of rotation of the rotor electrode and a generally arcuated, convexed discharge surface perpendicular to the plane of rotation to define a discharge gap on it. The electrode head has an electrically high-resistance layer attached to at least the pair of substantially flat surfaces, and comprises a material including a ceramic effective to suppress noise electromagnetic wave radiation at the discharge surface. The high-resistance layer material may comprise 10% to 70% of SiC and a mixture of SiOx, Si and C and may be attached to the discharge surface as well as to the flat surfaces, or to the flat surfaces only to expose the arcuated discharge surface to the discharge gap. The arcuated discharge surface may have ridges and grooves extending generally perpendicularly to the plane of rotation, and may have a wave-shaped or comb-shaped contour. The high-resistance layer may have a first ceramic layer of a first ceramic material exhibiting a good noise suppressing characteristic at the discharge surface and a second ceramic layer of a second ceramic material exhibiting a good adhesive characteristic at where it is attached to electrode head. The first ceramic material may comprise nitride ceramic or carbide ceramic such as silicon carbide and the second ceramic material may comprise oxide ceramic such as aluminum oxide.