Guard rail for contiguous element bubble chips
US4263662A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 28, 1979 |
| Grant date | Apr 21, 1981 |
| Priority date | — |
| Expiry date | Dec 28, 1999 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11C19/0858
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
Guard rails are described for particular use with magnetic bubble domain chips using contiguous propagation elements. These guard rails generally surround the active device area (storage area) of the chip and are used to move stray bubble domains from the storage area to the edge of the chip, or to a collapser etc., and also to prevent stray bubbles from entering the active device area. These guard rail structures are comprised of contiguous propagation elements characterized by an undulating edge and a smooth edge, both of which generally move bubble domains away from the active device area in response to the reorientation of the same magnetic drive field. In one embodiment, the guard rail is a spiral structure surrounding the active device area, having one end in the interior of the magnetic bubble chip adjacent to the active device area, and another end near the edge of the chip, or near a bubble annihilator, etc. In another embodiment, the guard rail is comprised of a plurality of structures generally defining a broken-spiral which surround the active device area. One end of each of structure is located near the active device area, while the other end is disposed toward the edg…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.