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US 3,943,497 AGranted
Split coil type bubble domain driving apparatus
AssigneeHitachi, Ltd.
InventorsShigeru Yoshizawa, Nobuo Saito, Itsuo Mikami, Gen-ichi Kamoshita
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Abstract
A bubble domain driving apparatus is provided in which a large memory device with a storage capacity of 256 megabits, for example, is divided into 64 smaller memory elements, each thereof comprising one or plurality of thin magnetic film strips for bubble domain, and each of the 4-megabit smaller memory elements is provided with its own coils for applying in the plane thereof bubble domain driving rotating fields with the coils adapted to be selectively energized.
Claims5
A split coil type bubble domain driving apparatus comprising:
- a plurality of memory elements each consisting of at least one magnetic film for a bubble domain;
- a plurality of rotating in-plane field generating coil means provided one for each of said plurality of memory elements to apply bubble domain driving rotating fields in the plane of said memory element, each of said plurality of coil means consisting of an X coil and a Y coil for applying magnetic fields perpendicular to each other in the same plane of said memory plane;
- first driving means for supplying an alternating current to said rotating in-plane field generating coil means;
- and first selection means connected between said first driving means and said rotating in-plane field generating coil means for selecting a given one of said plurality of rotating in-plane field generating coil means in response to a memory request, whereby said alternating current from said first driving means is applied only to the rotating in-plane field generating coil means selected by said first selection means.
1 more element
Dependencies are inferred from the claim text.