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Magnetic Bubble Domain Read Head Array

IP.com Disclosure Number: IPCOM000078312D
Original Publication Date: 1972-Dec-01
Included in the Prior Art Database: 2005-Feb-25
Document File: 2 page(s) / 44K

Publishing Venue

IBM

Related People

Chang, H: AUTHOR

Abstract

A read head for detecting domains in magnetic recording media, such as tapes, utilizes a plurality of bubble domain channels, which are brought into flux coupling proximity to the domains in the magnetic recording medium. The stray magnetic field of the recorded domains interacts with bubble domains in the read head to cause a domain to be propagated to a sensor, depending upon the presence or absence of 1 or 0 bits in the recording medium.

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Magnetic Bubble Domain Read Head Array

A read head for detecting domains in magnetic recording media, such as tapes, utilizes a plurality of bubble domain channels, which are brought into flux coupling proximity to the domains in the magnetic recording medium. The stray magnetic field of the recorded domains interacts with bubble domains in the read head to cause a domain to be propagated to a sensor, depending upon the presence or absence of 1 or 0 bits in the recording medium.

Fig. 1 shows the system, in which the bubble domain read-head array 10 is shown rotationally displaced from a position in proximity to the magnetic recording medium, in this case tape 12. Domains 14 in tape 12 are directly sensed by head 10 and signals representative of these domains are supplied to the utilization means 16. Also located on tape 12 are check bits 18, which are used to synchronize bubble domain circuitry in head 10 with the speed of tape
12. Check bits 18 are magnetized regions which are detected by sensing head 20, which supplies signals to control circuit 22. Control circuit 22 provides inputs to head array 10 to synchronize the operation of the head with the tape motion.

For each magnetic domain to be sensed in tape 12, the head 10 has circuitry comprising a generator G, a bubble domain compressor circuit, an annihilator A and a sensor S. For instance, magnetic flux from the area of domain 14A in tape 12 will be sensed by the bubble domain circuitry comprising generator G1, compressor 1, annihilator A1, and sensor S1.

Referring to Figs. 2 and 3 for more detail, the tape 12 has a series of recording tracks (n-1) n, (n+1), etc. Each of these tracks has a plurality of magnetic domains 14 therein. Located over tape 12 and in flux coupling proximity thereto is the head array 10, which i...