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:
Oct. 29, 1991
Filed:
Jan. 27, 1989
Mitsuhiro Horikawa, Suwa, JP;
Hiroshi Ito, Suwa, JP;
Tsugio Ide, Suwa, JP;
Michio Yanagisawa, Suwa, JP;
Tatsuya Shimoda, Suwa, JP;
Koji Akioka, Suwa, JP;
Seiko Epson Corporation, Tokyo, JP;
Abstract
An actuator rotatable about a support shaft rectilinearly movable along axis of a shaft and rotatably movable about the shaft includes a cylindrical magnet extending about the shaft. The cylindrical magnet has a plurality of poles in the radial direction and magnetized boundaries between poles of opposite polarity extending in a circumferential direction of the magnet and extending in an axial direction of the magnet. A plurality of yokes are provided to define magnetic poles coupled in facing relationship with the magnetic boundaries of a cylindrical magnet and having coils coupled thereto to define the magnetic poles.