Browse Prior Art Database

Laminated Structures

IP.com Disclosure Number: IPCOM000091007D
Original Publication Date: 1969-Sep-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 3 page(s) / 38K

Publishing Venue

IBM

Related People

Brock, GW: AUTHOR

Abstract

Laminated structures are provided by diffusion bonding of laminae. This is accomplished by forming metallic sheet material into laminae. A thin electrically nonconductive coating is provided on the facing portions of the laminae. The laminae are stacked in registered contacting relationship. The stack is subjected to heat for a time sufficient to cause diffusion of metallic material through the nonconductive coating from one lamina to the next adjacent lamina to form bonding tacks. The resulting laminated structure is then either operationally placed into its ultimate use or it can be further shaped and finished mechanically or chemically.

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Laminated Structures

Laminated structures are provided by diffusion bonding of laminae. This is accomplished by forming metallic sheet material into laminae. A thin electrically nonconductive coating is provided on the facing portions of the laminae. The laminae are stacked in registered contacting relationship. The stack is subjected to heat for a time sufficient to cause diffusion of metallic material through the nonconductive coating from one lamina to the next adjacent lamina to form bonding tacks. The resulting laminated structure is then either operationally placed into its ultimate use or it can be further shaped and finished mechanically or chemically.

A representative example of the use of this diffusion bonding technique is in the construction of multihead magnetic recording transducers. Multihead transducer 10 is shown in a cutaway and in a partially exploded perspective. It includes laminated write heads 12, read heads 14, and shields 16. Laminations 18 and 20 from which shields 16 are formed are shown in a further exploded perspective. The device further includes a nonmagnetic housing 22 which supports the operative parts of the assembly. Each group of magnetic heads is arranged in spaced-apart side-by-side relation, spaced from its neighbors by an intertrack shield member 16 which is also mounted in housing 22.

Shields 16 physically, magnetically, and electrically define space between recording tracks and also serve to reduce cross talk between adjacent heads. Intertrack shield 16 consists of a number of laminae. Outer laminae 18 are preferably formed of conductive, metallic, magnetically nonpermeable material, such as copper, brass, silver, bronze, phosphor-bronze, aluminum, or similar material. Inner lamina 20 is formed of the same types of metallic, magnetically permeable material as is utilized in magnetic heads, such as permalloy, HyMu 80, or similar material. I...