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:
Mar. 27, 1990
Filed:
Dec. 30, 1988
Jean-Marc Fedeli, Le Fontanil, FR;
Joel Magnin, Saint Martin d'Heres, FR;
Marie-Therese Delaye, Grenoble, FR;
Marc Rabarot, Grenoble, FR;
Commissariat a l'Energie Atomique, Paris, FR;
Abstract
Magnetic bubble memory in hybrid technology using rows of chevron patterns. The memory detection system has an active detection zone (4) constituted by rows of chevrons, in order to stretch into the form of a strip the bubbles from a propagation path (2), and a first detector (8); a bubble elimination zone (12) constituted by forcing back means (18) for stopping the advance of the bubbles and for forcing them outside the detection system; and a passive detection zone (6) located following the bubble elimination zone (12) and incorporating a second detector (9), to which no bubble must be exposed, in order to eliminate the unwanted signal due to the influence of a rotary magnetic field necessary for the propagation of the bubbles. According to the invention, elimination zone (12) is provided with at least one barrier (20) produced by ion implantation in order to block the passage of the bubbles from active zone (4) to passive zone (6). The barrier or barriers (20, 22, 26, 28, 30) can be constituted by a high energy implantation of H.sub.2.sup.+ ions.