Browse Prior Art Database

Magnetic Head Assembly

IP.com Disclosure Number: IPCOM000085408D
Original Publication Date: 1976-Apr-01
Included in the Prior Art Database: 2005-Mar-02
Document File: 2 page(s) / 52K

Publishing Venue

IBM

Related People

Smathers, EW: AUTHOR

Abstract

This magnetic recording head core, shown in cross section, is locked into a complete head structure by the use of material having a negative coefficient of thermal expansion. The complete head structure consists generally of shell 2 including a pair of transducing elements 4 and 6 defining a transducing gap 8. Also included within the structure is support element ]0 including beveled surface 12, normally provided to receive a solid wedge to lock the head assembly together.

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Magnetic Head Assembly

This magnetic recording head core, shown in cross section, is locked into a complete head structure by the use of material having a negative coefficient of thermal expansion. The complete head structure consists generally of shell 2 including a pair of transducing elements 4 and 6 defining a transducing gap 8. Also included within the structure is support element ]0 including beveled surface 12, normally provided to receive a solid wedge to lock the head assembly together.

However, in this embodiment a wedge is not utilized to lock the assembly together. Rather a molten metal 14 having a negative coefficient of thermal expansion, such as bismuth or its alloys, is poured into the wedge receiving opening. Upon cooling, the metal expands evenly to continuously exert lateral pressure upon the components within the shell 2, thus locking the head assembly together without any other bonding materials. Utilizing this technique avoids the necessity of providing a precision wedge to lock the head components together.

In one modification the molten metal receiving opening need not be wedge shaped. A rectilinear opening will serve the same purpose. Whether an angular or a rectilinear opening is provided, the use of molten metal having a negative coefficient of thermal expansion eliminates tolerance sensitivity between shell 2 and the surface of support element 10 which defines the metal receiving opening.

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