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Browse Prior Art Database

High Speed Magnetic Printer

IP.com Disclosure Number: IPCOM000078994D
Original Publication Date: 1973-Apr-01
Included in the Prior Art Database: 2005-Feb-26
Document File: 2 page(s) / 32K

Publishing Venue

IBM

Related People

Cole, JN: AUTHOR

Abstract

A method for writing onto a magnetic drum has been devised using an infrared-emitting laser.

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High Speed Magnetic Printer

A method for writing onto a magnetic drum has been devised using an infrared-emitting laser.

The major components of the writing scheme are an infrared laser 2, a rotating mirror 4, a magnetic drum 6 and a modulator 8 for modulating the output of the laser. The magnetic drum 6, in its initial stage, is fully magnetized. The modulated laser beam stores information by being swept across the drum surface, due to the combined action of the rotating drum 6 and revolving mirror. The presence of infrared on the surface of the drum will raise the 4 Curie temperature of such surface, causing demagnetization of such surface. The absence of infrared will allow the untouched surface of the drum to remain magnetized. The stored magnetic information on the drum may be removed, by conventional means, as a printout.

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