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Glassing Method For Magnetic Heads

IP.com Disclosure Number: IPCOM000050190D
Original Publication Date: 1982-Sep-01
Included in the Prior Art Database: 2005-Feb-10
Document File: 3 page(s) / 68K

Publishing Venue

IBM

Related People

Chow, WW: AUTHOR [+4]

Abstract

A single glass can serve two purposes, that is, joining and filling pieces of a magnetic head. Magnetic ceramic pieces can be fastened to a non-magnetic ceramic backing, and the magnetic ceramic pieces can be separated by placing a glass rod adjacent to the contact line between a slotted magnetic block of material and a non-magnetic block grooved for insertion of the magnetic piece. The non-slotted portion of the magnetic stock is then removed to expose the magnetically isolated magnetic pieces. The backing can then be further machined to provide a closure for a magnetic head assembly.

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Glassing Method For Magnetic Heads

A single glass can serve two purposes, that is, joining and filling pieces of a magnetic head. Magnetic ceramic pieces can be fastened to a non-magnetic ceramic backing, and the magnetic ceramic pieces can be separated by placing a glass rod adjacent to the contact line between a slotted magnetic block of material and a non-magnetic block grooved for insertion of the magnetic piece. The non-slotted portion of the magnetic stock is then removed to expose the magnetically isolated magnetic pieces. The backing can then be further machined to provide a closure for a magnetic head assembly.

The process steps are shown in Figs. 1-4. A block 1 of magnetic stock is shown in Fig. 1 containing partial slots 2. The block 1 is placed into a grooved section 3 of the backing stock 4 with the slots 2 facing into the block 4, as shown in Fig. 2. A glass rod 5 is then placed adjacent to the two pieces. The glass will melt when the pieces are heated in a furnace and flow into the cracks between the two pieces. The whole composite is ground to expose veneer pieces 6 of the magnetic material magnetically isolated by the glass 7 now filling the slots 2 between the pieces. AS shown in Fig. 4, two grooves 8 are cut into the backing piece 4 and the composite is bisected through the center of the veneer pieces 6 to form two complete write closures.

Figs. 5A and 5B show another configuration to improve the flow of the glass. In Fig. 5A, the glass rod 5 is first melted onto the magnetic block 1 already containing the slots. The block 1 with the melted glass 5 is then placed adjacent to the backing piece 4 and placed in the furnace to melt the glass and flow the glass between the slots 2 of the magnetic piece 1 and to bond the pieces together. Figs. 6 and 7 show another embodiment using shaped pole pieces. In Fig. 6, the shaped pole pieces 10 are formed from the block of the magnetic mater...