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:
Sep. 03, 2002
Filed:
Nov. 15, 2000
Junichi Matsumoto, Tokyo, JP;
Kouichi Kobayashi, Tokyo, JP;
Nidec Copal Corporation, Tokyo, JP;
Abstract
In an electromagnetic actuator, a rotor composed of a permanent magnet is mounted rotatably in two directions between a first end position and a second end position via an intermediate position. A coil is wound around the rotor to rotate the rotor in an energizing state where an electric current is applied to the coil. An auto-retaining device is provided for retaining the rotor at one of the intermediate position, the first end position and the second end position under a non-energizing state where the electric current is not applied to the coil. The auto-retaining device has an elastic member that regulates the rotor at the intermediate position by a mechanical elastic force, a first magnetic member that is opposed to the permanent magnet and that retains the rotor at the first end position by a magnetic attractive force, and a second magnetic member that is opposed to the permanent magnet and that retains the rotor at the second end position by a magnetic attractive force.