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Browse Prior Art Database

High Speed Magnetic Printer

IP.com Disclosure Number: IPCOM000078995D
Original Publication Date: 1973-Apr-01
Included in the Prior Art Database: 2005-Feb-26
Document File: 2 page(s) / 29K

Publishing Venue

IBM

Related People

Cole, JN: AUTHOR

Abstract

A method is devised for writing magnetic patterns into a magnetic drum and then duplicating or printing out such patterns.

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High Speed Magnetic Printer

A method is devised for writing magnetic patterns into a magnetic drum and then duplicating or printing out such patterns.

A thin film magnetic head 2 has its leads 4 connected to a suitable electronic source for sending write signals to the head, so as to magnetize the surface of a drum 6 in a conventional writing manner. The head 2 has associated therewith a sonic delay line 8 which, upon command, can send a sonic pulse down the length of the drum's surface.

Writing on the drum's surface occurs when an electrical signal is applied to the write head 2, and such signal is coincident with a sonic pulse occurring at some timed distance along the surface. The drum 6 is rotated and, during rotation, successive sonic pulses are sent across the drum with appropriately selected electrical signals to the head 2, until the drum is completely written upon. Magnetic ink is made to adhere to the magnetized areas of the drum and the latter can be used as a printer.

It is estimated that the writing time for an 8'' X 12'' page will be about one second and have good quality reproduction. Additionally, only one write head need be used when coincident pulses (sound pulse and electrical pulse) are employed.

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