Browse Prior Art Database

Wrap Around Bubble Device Field Package

IP.com Disclosure Number: IPCOM000078705D
Original Publication Date: 1973-Feb-01
Included in the Prior Art Database: 2005-Feb-26
Document File: 2 page(s) / 66K

Publishing Venue

IBM

Related People

Lyons, WA: AUTHOR [+2]

Abstract

Rotating in-plane electromagnetic fields are used for the propagation of magnetic domains in bubble storage devices. The required fields are provided by a pair of orthogonal coils which are conveniently formed from a copper clad insulating board, which is properly conductively patterned on both sides and then folded about a rectangular frame surrounding the bubble devices.

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Wrap Around Bubble Device Field Package

Rotating in-plane electromagnetic fields are used for the propagation of magnetic domains in bubble storage devices. The required fields are provided by a pair of orthogonal coils which are conveniently formed from a copper clad insulating board, which is properly conductively patterned on both sides and then folded about a rectangular frame surrounding the bubble devices.

A flexible polyimide insulating board which is copper clad on both sides is cut and patterned, as shown in Fig. 1. An appropriate art work pattern is etched in both sides of the copper clad board 4 using standard etching techniques to form the striped conductors 1, which extend from side 2 to side 3 on the near surface of board 4, as viewed in the drawing. Striped conductors 5 also are formed, but these extend from side 6 only approximately halfway to side 7 on the near surface of board 4. Striped conductors 8 on the lower surface of board 4, extend from a location underneath the ends of stripes 5 to side 7 of board 4. Conductive via holes 9 establish electrical connection between the ends of stripes 5 on the near side of the board and the ends of stripes 8 on the lower side of the board, so as to provide continuous conductive pathways from side 6 to side 7. Holes 10, 11, 12 and 13 are placed through the board for the later insertion of conductive pins.

The flexible polyimide board 4, with its properly defined striped conductors, is folded about rectangul...