Browse Prior Art Database

Low Noise Magnetic Recording Head

IP.com Disclosure Number: IPCOM000095079D
Original Publication Date: 1965-Sep-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 33K

Publishing Venue

IBM

Related People

Stapper, CH: AUTHOR [+2]

Abstract

Feed-through noise occurring in high density recording heads due to electromagnetic fields is substantially reduced by introducing a shield into the transducing surface of the head. The shield also has the effect of producing extremely high field gradients at the transducing gap.

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Low Noise Magnetic Recording Head

Feed-through noise occurring in high density recording heads due to electromagnetic fields is substantially reduced by introducing a shield into the transducing surface of the head. The shield also has the effect of producing extremely high field gradients at the transducing gap.

The head is formed of a pair of pole pieces 1 and 2. These are positioned together to define transducing gap 3. Pole pieces 1 and 2 are conventional in all respects and can be formed of mu-metal or a ferrite material. A conductive shield having elements 4 and 5 is inlaid in substantially all of the transducing surface of pole pieces 1 and 2, respectively. The conductive shield elements can be formed of copper. Element 4 is inlaid in pole piece 1, completely covers it, and extends to the edge of gap 3. Element 5 is inlaid in substantially all of the transducing surface of pole piece 2 except for a small portion 6 which is contiguous to the gap 3.

The feed-through noise generated by pole pieces 1 and 2 of one head which interferes with the operation of adjacent heads is substantially eliminated by reducing the portions of pole pieces 1 and 2 that are exposed. The amount of generated noise is directly related to the amount of pole piece that is exposed. In addition, shield elements 4 and 5 have the effect of producing extremely high field gradients at gap 3 allowing for high-density recording. Thus, the magnetic fringing field necessary to record on a tape...