公开(公告)号：DE2657813A1

公开(公告)日：1977-09-01

申请号：DE2657813

申请日：1976-12-21

Applicant: IBM

Inventor： HIGHNOTE JERRY LEE

IPC: H01F38/14 ,  G11B5/02 ,  H01F38/18 ,  G11B5/52

Abstract: A unique concentric rotary transformer for use in a rotating head tape transport, wherein a length of tape is positioned relative to the rotating head and data is recorded and/or reproduced therefrom, is disclosed. The rotary transformer comprises two assemblies one of which rotates relative to the other and thereby transmits electrical signals. Each assembly includes a ferrite cylindrical core piece with two grooves machined in the core piece. The grooves are axially and circumferentially displaced along a longitudinal axis of said core piece. A continuous coil with two legs, is positioned within the grooves of the core piece whereat mutual inductances generated in the ferrite core by each leg of the coil effectuate signal transfer across the transformer interface.

公开(公告)号：DE2601449A1

公开(公告)日：1976-09-16

申请号：DE2601449

申请日：1976-01-16

Applicant: IBM

Inventor： HIGHNOTE JERRY LEE ,  O'DAY RICHARD LEWIS

IPC: H01F38/14 ,  G11B5/008 ,  G11B5/03 ,  G11B5/09 ,  G11B15/02 ,  G11B15/04 ,  G11B15/12 ,  G11B15/14 ,  G11B20/16 ,  G11B5/02 ,  G11B5/12 ,  G11B5/52 ,  H04N5/78

Abstract: A rotating head magnetic tape unit having a fixed stator and a rotating rotor is disclosed. A plurality of transformers are positioned between the rotor and the stator so as to establish an interface for the transmission of electrical signals. Circuit means is provided on the rotor of the rotating head magnetic unit for reclocking data phase shifted by the transformer interface, for protecting against inadvertent write on a magnetic tape, and for synchronizing the clock with the data in a write driver whereby the clock may be used as A.C. bias for the written signal. An N times data frequency clock signal received on the rotor is divided N/2 to obtain the reclocking signals. With regard to the synchronization between the clock and write driver, the N times data frequency clock on the rotor is synchronized on the write driver with the data to accomplish A.C. bias recording.