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Degausser for Magnetic Recording Media

IP.com Disclosure Number: IPCOM000059855D
Original Publication Date: 1986-Jan-01
Included in the Prior Art Database: 2005-Mar-08
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Beach, LR: AUTHOR [+3]

Abstract

When manufacturing high performance magnetic tape it is necessary to orient the magnetic particles in the tape in the direction of the recording signals to be subsequently used to record data on the tape. The saturated, unidirectional field created by this orientation can cause problems where subsequent testing and recording heads only penetrate the upper portion of the magnetic coating, leaving the under portion of the coating fully saturated and thereby creating magnetic noise. This problem can be overcome by demagnetizing or degaussing the tape before testing

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Degausser for Magnetic Recording Media

When manufacturing high performance magnetic tape it is necessary to orient the magnetic particles in the tape in the direction of the recording signals to be subsequently used to record data on the tape. The saturated, unidirectional field created by this orientation can cause problems where subsequent testing and recording heads only penetrate the upper portion of the magnetic coating, leaving the under portion of the coating fully saturated and thereby creating magnetic noise. This problem can be overcome by demagnetizing or degaussing the tape before testing

The figure shows a degausser for degaussing a coated and oriented web of media after it has dried and prior to its being rewound onto take up rolls. The degausser consists of two opposed sets of magnets 1 and 2. Each set is shown as comprising five magnets. Each magnet is placed in the path of web 3 in such a direction that the magnetic field produced by each magnet is in the opposite direction to the field produced by the orienting magnets. Three adjusting means are provided so that each magnet can be precisely located relative to the web. Position adjustment 4 raises and lowers the entire assembly relative to the 3 so that the web 3 can be located centrally of the two sets of magnets 1 and 2. Spacing adjustments 5 are provided so that the two sets of magnets 1 and 2 can be adjusted relative to one another. Individual adjustment means 6 are provided to align each in...