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Magneto Optic Deflection Method

IP.com Disclosure Number: IPCOM000089931D
Original Publication Date: 1968-Dec-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 67K

Publishing Venue

IBM

Related People

Magill, PJ: AUTHOR [+2]

Abstract

In this photographic memory a magneto-optic deflection method is used In this photographic memory a magneto-optic deflection method is used for scanning. Memory 1 is comprised of an array of magneto-optic elements 2 embedded in matrix 3. The latter is opaque to a laser light beam incident on the entire face of memory 1. Windings 4 and 5 surround each element 2 and are interconnected to provide coordinate selection of any desired element 2 by the closure of selection switches, for example, 4a and 5a. The selection of an element 2 causes rotation of the plane of polarization to permit the passage through it of a portion of the laser beam.

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Magneto Optic Deflection Method

In this photographic memory a magneto-optic deflection method is used In this photographic memory a magneto-optic deflection method is used for scanning. Memory 1 is comprised of an array of magneto-optic elements 2 embedded in matrix 3. The latter is opaque to a laser light beam incident on the entire face of memory 1. Windings 4 and 5 surround each element 2 and are interconnected to provide coordinate selection of any desired element 2 by the closure of selection switches, for example, 4a and 5a. The selection of an element 2 causes rotation of the plane of polarization to permit the passage through it of a portion of the laser beam.

Beyond memory 1 are analyzer 6, film plane 7, and detector array 9. Analyzer 6 is oriented for the extinction of light in the absence of a magnetic field. In order to deflect a discrete portion of film 7 for data readout, an appropriate element 2 is selected to present a portion of the incident laser beam to analyzer
6.

The application of the magnetic field, not shown, to analyzer 6 causes the selected laser portion to pass through such analyzer and through the desired portion of film 7. The information in the selected portion of film 7 is picked up by detector array 9. The latter translates the light energy into electrical signals indicative of the information read out from film portion 8.

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