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. 12, 1982
Filed:
Feb. 16, 1979
Jacques Droux, Montfermeil, FR;
Abstract
Binary bits on a magnetic storage medium are read by a magnetic head that moves at approximately constant speed relative to the medium. The medium includes several elongated adjacent magnetic tracks, each including a succession of longitudinally positioned polarized magnetic flux variations arranged in elemental areas of equal length along the length of each track. Adjacent areas are susceptible to having like and unlike magnetic flux polarizations. The head and tracks are positioned so the head straddles a pair of the tracks and is simultaneously responsive to flux variations in the straddled tracks. The head and track move relative to each other so the head is responsive to successive flux variations as time progresses. The areas are arranged so there is always a magnetic flux polarization transition at predetermined equi-spaced positions along the track length at a boundary between a pair of elemental areas. The transition direction at each boundary indicates a binary bit value. The fluxes of the elemental areas between adjacent boundaries selectively have different polarity variations to assure that like polarity transitions at each boundary represent like binary bit values.