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CYLINDRICAL MAGNETIC DOMAIN MEMORY APPARATUS

  • US 3,737,882 A
  • Filed: 01/28/1972
  • Issued: 06/05/1973
  • Est. Priority Date: 02/06/1971
  • Status: Expired due to Term
First Claim
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1. A cylindrical magnetic domain memory apparatus for storing information by the presence or absence of magnetic bubbles, comprising, a. a sheet of magnetic material of the type capable of retaining magnetic bubbles therein, b. a plurality of storage channel means on said sheet for circulating stored bubbles in response to an applied rotating magnetic field, c. an arrangement of thin film patterns on said sheet adapted to retain bubbles at closely packed positions adjacent said storage channels, said arrangement constituting a read-out channel packed with bubbles which are present along a predetermined direction in said read-out channel and which are moved in said predetermined direction when a bubble in the read-out channel adjacent a selected one of said storage channels is moved in said direction due to a repulsive force provided by a stored bubble reaching a predetermined position of any of said storage channels, d. bubble detecting means adjacent said read-out channel for detecting a bubble when one is applied thereto, said detecting means being positioned to receive the nearest bubble in said read-out channel when the bubbles present along said predetermined direction in said read-out channel are moved due to said repulsive force, e. a plurality of first magnetic switching means, associated respectively with each said storage channel, for altering the path of bubbles in a storage channel, when said associated magnetic switch is switched to a second state to cause said bubbles to reach a position in said storage channel sufficiently near said read-out channel to create the repulsive force required to cause movement of said bubbles in said readout channel, f. means for replacing bubbles in said read-out channel to refill said read-out channel, and g. control means for selectively switching said first plurality of magnetic switches to said second state.

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