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. 26, 1989
Filed:
Jan. 19, 1988
Yoshinori Koshida, Tokyo, JP;
Akihisa Tashiro, Tokyo, JP;
Oki Electric Industry Co., Ltd., Tokyo, JP;
Abstract
A rotary actuator includes a case, a shaft rotatably supported in the case, a moving coil with conductors extending radially from the shaft as a center, a support which supports the moving coil on the shaft, facing magnets set with facing unlike poles arranged alternately in the direction of motion of the moving coil on either side of it and generating a magnetic flux which crosses the moving coil conductors, a device for restricting rotation of the shaft such that the conductors of the moving coil do not move outside the magnetic flux generated by the magnet set, and a drive unit for sending electric current through the moving coil. The rotary actuator may further include an assisting device for assisting shaft rotation which includes moving magnets on the side edges of the support and fixed magnets installed in the case facing the moving magnets, either the moving or fixed magnets being electromagnets.