Browse Prior Art Database

Recording by Magnetic Deformation

IP.com Disclosure Number: IPCOM000078001D
Original Publication Date: 1972-Oct-01
Included in the Prior Art Database: 2005-Feb-25
Document File: 2 page(s) / 41K

Publishing Venue

IBM

Related People

Dorrell, CE: AUTHOR

Abstract

Recorded data is optically read by mechanically deforming a media in a magnetic field.

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Recording by Magnetic Deformation

Recorded data is optically read by mechanically deforming a media in a magnetic field.

Media, such as a magnetic tape or disc, carrying embedded magnetizable particles and free of inherent interference characteristics, is conventionally magnetically recorded upon by a record head. A magnetic field source, which may be a permanent magnet as shown in Fig. 1 or an electromagnet, deforms the media surface (Fig. 2) by attracting and repelling embedded particles in accordance with their previous magnetization by the head.

Media, deformed in accordance with recorded data, is read by viewing transverse regions by interference optics (for example, through a Schlieren filter) as the regions are scanned by a light source (see Fig. 3).

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