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. 13, 1983
Filed:
Oct. 30, 1981
Robert E Jones, Jr, San Jose, CA (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
A thin film inductive transducer is shown comprising three magnetic layers (10, 11, 12) deposited on a slider substrate (13) for perpendicular recording of magnetic transitions on a movable magnetic medium. Two magnetic closures are provided. One is defined by electrical contact of one outer magnetic layer (12 or 10) with the intermediate magnetic layer (11 or 11') within the area bounded by conductive turns (a-h) of single layer coil (19 or 19'). The other is defined by electrical contact (10, 12 or 10', 12') outboard of the conductive turns (a-h). Magnetic transitions may be read by conventional peak detection techniques because the disclosed transducer has three pole tips (P1, P2, P3), the central one P2 of which is approximately 33-40% of the thickness of the outer pole tips (P1, P3). To avoid 'wrap-around', the pole tips (P1, P2, P3) are progressively narrower in width as their distance from the substrate (13) increases.