Browse Prior Art Database

Magnetic Core Manufacture

IP.com Disclosure Number: IPCOM000095672D
Original Publication Date: 1964-May-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 33K

Publishing Venue

IBM

Related People

Hluszko, J: AUTHOR [+2]

Abstract

Magnetic cores having very small gaps are employed in transducers for some magnetic recording devices. The gap can be so small, for example 0.0002'' wide, that to form it directly by a wire cutting operation is difficult or impracticable.

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Magnetic Core Manufacture

Magnetic cores having very small gaps are employed in transducers for some magnetic recording devices. The gap can be so small, for example
0.0002'' wide, that to form it directly by a wire cutting operation is difficult or impracticable.

Instead, the gap is formed in core blank 10 by cutting a first slot 12 part way through the core with a tungsten wire of a first diameter. Then a second slot 14 is cut the rest of the way through the core with a tungsten wire of a second, slightly smaller diameter.

The two parts 10A and 10B of the core are then brought together and adhered by solder 16, or by welding, potting, clamping, or the like. This reduces gap 12 to the size shown at 12', and closes gap 14 to a butting relationship 14'. In the final steps 4 and 5, gap 12' is filled with non-magnetic material and the portion 18 of the core including the butted parts 14' is lapped away until the filled gap 12' is exposed.

The width of the gap 12' is determined by the difference in the diameters of the wires used in cutting slots 12 and 14, and can be small compared to those diameters.

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