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Multi-Turn Winding For Inductive Thin Film Head

IP.com Disclosure Number: IPCOM000048457D
Original Publication Date: 1982-Feb-01
Included in the Prior Art Database: 2005-Feb-08
Document File: 2 page(s) / 27K

Publishing Venue

IBM

Related People

Chow, WW: AUTHOR

Abstract

An increased number of turns can be placed in an inductive thin film head by stacking turns around a U-shaped film core. The open end of the core is connected to closure blocks to form a magnetic gap. The windings are wrapped around each leg of the core.

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Multi-Turn Winding For Inductive Thin Film Head

An increased number of turns can be placed in an inductive thin film head by stacking turns around a U-shaped film core. The open end of the core is connected to closure blocks to form a magnetic gap. The windings are wrapped around each leg of the core.

This design addresses the difficulty in packaging multi-track heads with a high number of turns in the winding. Two problems are commonly encountered. First, the turns of the winding are squeezed between the pitch of the adjacent tracks, making the line width of the winding extremely narrow. Second, if the turns of the winding are stacked on top of each other, this leads to excessive thickness of the composite film and a wide magnetic gap between the pole pieces. By the use of a U-shaped film core, this design allows a winding with a high number of turns, wide line widths, and low electrical resistance.

The figure shows a U-shaped film core with a multiple electrical winding. The U-shaped film core 1 is connected at its open ends 2 and 3 to ferrite closure blocks 4 and 5, respectively. The ferrite closure blocks 4 and 5 form a magnetic gap 6 between the blocks. The winding 7 is formed by alternating the electrical conductor films underneath and above the U-shaped core. The number of turns in the winding 7 does not influence the pitch between adjacent tracks of a multi- track head. Many turns can be incorporated into a transducer, according to the design shown in the...