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Readout System for Magnetically Stored Information

IP.com Disclosure Number: IPCOM000092527D
Original Publication Date: 1966-Dec-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 30K

Publishing Venue

IBM

Related People

Chang, D: AUTHOR

Abstract

Readout of the magnetically stored information is performed using an electron beam according to the Lorentz technique. Monitoring of the deflections of the electron beam during the readout to control its scanning pattern is performed by this system.

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Readout System for Magnetically Stored Information

Readout of the magnetically stored information is performed using an electron beam according to the Lorentz technique. Monitoring of the deflections of the electron beam during the readout to control its scanning pattern is performed by this system.

As shown in A, the Lorentz readout technique involves the direction of a beam of electrons from source 9 under the control of deflecting circuits 10 to magnetic storage film 11. Information is stored on film 11 as opposing magnetic manifestations. Manifestations of one type cause a deflection of the beam into path 12. Manifestations of the other type cause a deflection into path 13. Under the control of electronic lenses 14 and 15, the conventional procedure is to employ detecting plane 16 for accepting the deflected electrons to provide an indication of the stored information.

This system provides a beam scan control arrangement to assure line-by-line correspondence in the scanning of film 11. A pattern of conductor strips 17 is positioned at plane 16 to monitor the deflections of the beam. Strips 17 are connected to servo circuits to control the tracking of the beam in scanning the lines of film 11.

As shown in B, two groups of conductor strips X and Y are arranged in alternating manner for one direction. A scanning space is provided between each two adjacent strips. As the electron beam scans film 11, the deflections straddle the nearest conductor pair. This is acc...