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:
Jan. 25, 2011
Filed:
May. 10, 2006
Keiji Nakamura, Chiba, JP;
Makoto Takabatake, Chiba, JP;
Masahiro Takahashi, Hiratsuka, JP;
Shuichi Kubota, Hiratsuka, JP;
Takao Asada, Hiratsuka, JP;
Toshiya Yamamoto, Hiratsuka, JP;
Keiji Nakamura, Chiba, JP;
Makoto Takabatake, Chiba, JP;
Masahiro Takahashi, Hiratsuka, JP;
Shuichi Kubota, Hiratsuka, JP;
Takao Asada, Hiratsuka, JP;
Toshiya Yamamoto, Hiratsuka, JP;
Mabuchi Motor Co., Ltd., Chiba, JP;
Tanaka Kikinzoku Kogyo K.K., Tokyo, JP;
Abstract
An object of the present invention is to provide a commutator or brush material for a small electric DC motor which enables a lengthened operating life of a spindle motor for a DVD controlled using a pulse current. A commutator material for a small electric DC motor in accordance with the present invention is characterized by being composed of 6.0 to 10.0 wt % of Cu, 1.0 to 5.0 wt % of ZnO, and a balance of Ag and in that Cu metal particles and ZnO particles are dispersed in an AgCu matrix. A brush material for a small electric DC motor in accordance with the present invention is characterized by being composed of 0.1 to 5.0 wt % of MgO and a balance of Ag and in that MgO particles are dispersed in an Ag matrix, or is characterized by being composed of 5.0 to 15.0 wt % of Ni and a balance of Pt and in that Ni is dissolved in a Pt matrix.