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. 18, 1988
Filed:
Dec. 22, 1986
Jasper S Chandler, Rochester, NY (US);
Eastman Kodak Company, Rochester, NY (US);
Abstract
A motor assembly incorporated in an optical read head to effect tracking or focusing movement of an optical element comprises a generally horseshoe-shaped field assembly having two slotted pole pieces magnetized with opposite polarity of a permanent magnet to provide two pairs of field poles confronting corresponding poles of a moveable armature. A single coil is wound through the slots of the pole pieces around the inner field poles. The direction and intensity of the current flowing in the field coil determines the degree to which the permanent magnetism is reinforced in one pole of each pole piece and counteracted in the other pole of each pole piece, thereby causing corresponding movement of the armature.