U.S. Philips Corporation

Franciscus Antonius Kuipers

Arie Luite Visscher

Edmond De Niet

Willem Frederik Druyvesteyn

Cor Van De Wardt

Adrianus Wilhelmus Van Den Enden

Hendrik Steller

Pieter Morssink

Rene Gerard Makel

The invention relates to a plate of magnetic material wherein magnetic domains can be formed and driven along guide structures consisting of discrete elements of magnetizable material, for example, vapor-deposited permalloy. The plate is used as a memory, a number of mainly parallel extending input structures forming paths for the domains between relevant outputs of the memory and relevant inputs of a decoding device. The decoding device comprises delay elements which can each be activated by a specific rotary field sequence. The output of the decoder device has connected thereto a detection element which can thus selectively detect a domain from a predetermined input structure, because exactly for the relevant domain a synchronization exists between a part of the rotary field sequence and the arrival of the relevant domain at a delay element. Therefore, neither further current wires are required for activating the decoding device, nor separate detection lines for detectors which are selective per input structure. A number of simple delay elements which have a compact construction and which can be readily activated are described.

Memory device

Growing community of inventors

Eindhoven, Netherlands

Franciscus Antonius Kuipers