Magnetic bubble memory device
US4811286A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 2, 1987 |
| Grant date | Mar 7, 1989 |
| Priority date | — |
| Expiry date | Feb 2, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11C19/0866
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A magnetic bubble memory has a reading zone with thin detection elements, coated with an insulating layer which carries thick bubble propagation patterns of high magnetic permeability material, and a bubble stretching zone also including thick propagation patterns of shapes such that the rotating field of the device causes the bubbles to progress along the patterns. The device further includes, out of the detection zone, additional thin localized elements of high magnetic permeability material having a thickness much lower than that of the patterns, obtainable by photolithography and located at the same level as the thin detection elements. When located in the stretching zone, the thin patterns are arranged to cooperate with thick patterns so that the voltage well generated by the rotating field of the device has a substantially constant value while moving along the thick patterns.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.