公开(公告)号：DE3265967D1

公开(公告)日：1985-10-10

申请号：DE3265967

申请日：1982-03-25

Applicant: IBM

Inventor： SMATHERS EDMOND WATKINSON

IPC: B65G51/03 ,  B65H5/00 ,  B65H5/22 ,  G10K15/00

公开(公告)号：DE3071125D1

公开(公告)日：1985-10-31

申请号：DE3071125

申请日：1980-11-14

Applicant: IBM

Inventor： COX ALLEN RONALD ,  SMATHERS EDMOND WATKINSON

IPC: G11B5/105 ,  G11B5/48 ,  G11B5/60 ,  G11B5/127

公开(公告)号：DE2849693A1

公开(公告)日：1979-06-07

申请号：DE2849693

申请日：1978-11-16

Applicant: IBM

Inventor： CHEATHAM SAMUEL DAVID ,  ROBINSON NEIL LLOYD ,  SMATHERS EDMOND WATKINSON

IPC: G11B5/127 ,  G11B5/23 ,  G11B5/14 ,  G11B5/42

Abstract: An AC magnetic erase head having improved AC erase characteristics, the magnetic head being formed of two half core elements of a magnetic material, preferably ferrite, defining an irregular edged or jagged-edged gap, and including a non-magnetic substance, preferably glass, within the gap. The magnetic head is preferably produced by thermally etching ferrite magnetic material forming the half core elements by means of relatively prolonged heat soak at an elevated temperature.

公开(公告)号：DE2813193A1

公开(公告)日：1978-10-05

申请号：DE2813193

申请日：1978-03-25

Applicant: IBM

Inventor： MARINO PETER THOMAS ,  SHELLEDY FRANK BOYD ,  SMATHERS EDMOND WATKINSON

IPC: G11B5/127 ,  G11B5/187 ,  G11B5/265 ,  G11B5/588 ,  G11B15/467 ,  G11B5/27