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:
Dec. 23, 1997
Filed:
Jul. 20, 1995
James A Parison, Fitzwilliam, NH (US);
Thomas A Froeschle, Southborough, MA (US);
Robert L Maresca, Hopkinton, MA (US);
Bose Corporation, Framingham, MA (US);
Abstract
An electromagnetic transducer includes a first member and a second member which are relatively slidable along a path having spaced endpoints and which are electromagnetically coupled. The second member has at least one winding which produces a magnetic field which penetrates the second member. The second member has a plurality of contiguous permanent magnets of alternate polarity along the path which establish a periodic magnetic field which reacts with the magnet field created by the first member so as to produce force along the path. The plurality of contiguous permanent magnets are disposed along the path such that transition lines dividing adjacent ones of the magnets are formed at a non-perpendicular angle to the path to allow gradual transition between flux directions.