Browse Prior Art Database

Deeper Etch for Improved Head Performance

IP.com Disclosure Number: IPCOM000046909D
Original Publication Date: 1983-Aug-01
Included in the Prior Art Database: 2005-Feb-07
Document File: 2 page(s) / 53K

Publishing Venue

IBM

Related People

Gravdahl, VD: AUTHOR [+3]

Abstract

The magnetic read/write head or transducer shown in Figs. 1-3 includes a pair of opposite ferrite pieces 10 and 12 having a thin sheet of glass 14 between them so as to form a transducing gap 16. The head shown in Figs. 4-6 includes a pair of ferrite pieces 18 and 20 with a thin sheet of glass 22 between them to form a transducing gap 24. In order to reduce the leakage flux about the gaps 16 and 24, gap 16 is provided in a raised plateau 26 and gap 24 is provided in a higher raised plateau 28. The plateau 26 of Figs. 1-3 is intended to be in contact or very close contact with a moving magnetic disk, for example, so that the disk traverses across gap 16. Ferrite piece 10 is provided with notch 30, and an electric coil 32 extends through notch 30.

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Deeper Etch for Improved Head Performance

The magnetic read/write head or transducer shown in Figs. 1-3 includes a pair of opposite ferrite pieces 10 and 12 having a thin sheet of glass 14 between them so as to form a transducing gap 16. The head shown in Figs. 4-6 includes a pair of ferrite pieces 18 and 20 with a thin sheet of glass 22 between them to form a transducing gap 24. In order to reduce the leakage flux about the gaps 16 and 24, gap 16 is provided in a raised plateau 26 and gap 24 is provided in a higher raised plateau 28. The plateau 26 of Figs. 1-3 is intended to be in contact or very close contact with a moving magnetic disk, for example, so that the disk traverses across gap 16. Ferrite piece 10 is provided with notch 30, and an electric coil 32 extends through notch 30. Ferrite pieces 10 and 12 may be etched in their construction, and reduced height surfaces 34 and 36 are etched on the opposite sides of plateau 26. V- shaped grooves 38 and 40 are provided with their bottoms in alignment with glass sheet 14. Notch 30 is provided with an apex surface 42 that has its upper end substantially at the bottom of grooves 38 and 40. Ferrite pieces 10 and 12 are bonded together with molten glass which leaves glass beads 43 between apex surface 42 and the opposite end surface of ferrite piece 12, as shown in Figs. 1 and 3. In operation, the transducer of Figs. 1-3 has the disk moving across it in direction A, for example, so that gap 16 is substantially on a radius of the disk. The gap 16 may therefore have a magnetic reading or writing effect with respect to the disk, with the flux across gap 16 being produced by a current in winding 32 for a writing action or causing current to flow in winding 32 if there is a reading action. The flux leakage from gap 16 is reduced by having the surfaces 34 and 36 spaced a substantial distance, such as 12 microns, from the flat upper surface of plateau 26, and the...