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Browse Prior Art Database

Beam Addressable Store

IP.com Disclosure Number: IPCOM000078887D
Original Publication Date: 1973-Mar-01
Included in the Prior Art Database: 2005-Feb-26
Document File: 2 page(s) / 40K

Publishing Venue

IBM

Related People

Ahn, KY: AUTHOR

Abstract

In the drawing is shown a beam addressable store, in which a film 10 of nonstoichiometric ferromagnetic composition having atomic proportions (Image Omitted) is located on a substrate 12 of glass, spinel, quartz, sapphire or a metal such as aluminum or copper. An energy source 14 is provided which could consist of a laser array that produces a monochromic beam 16, which can provide energy of sufficient intensity to heat a localized region 38 of film 10 to a temperature approximately to its Curie point to write information on the film. Alternatively, an electron beam could be used. Polarizer 18 is used to produce a plane polarized beam. An analyzer 30 is used during a reading operation to either pass or block light of a selected polarization.

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Beam Addressable Store

In the drawing is shown a beam addressable store, in which a film 10 of nonstoichiometric ferromagnetic composition having atomic proportions

(Image Omitted)

is located on a substrate 12 of glass, spinel, quartz, sapphire or a metal such as aluminum or copper. An energy source 14 is provided which could consist of a laser array that produces a monochromic beam 16, which can provide energy of sufficient intensity to heat a localized region 38 of film 10 to a temperature approximately to its Curie point to write information on the film. Alternatively, an electron beam could be used. Polarizer 18 is used to produce a plane polarized beam. An analyzer 30 is used during a reading operation to either pass or block light of a selected polarization. Detector 32 is responsive to the light which strikes it and produces an electrical signal, indicative of the information state of the selected portion 38. Associated with array 14 is an intensity control circuit 40, which is used to modulate the intensity of beam 16 during reading or writing.

Associated with film 10 is a current carrying coil 26, which is used to provide a magnetic field in film 10 for writing information into film 10.

Disc drive means 42 is used to rotate the disc in the direction of arrow 44, so that selected portions of the film 10 can be addressed by a stationary laser beam. Clearly, addressing can be achieved by deflecting the laser or by an electromagnetic beam. The material of th...