公开(公告)号：FR2410861A1

公开(公告)日：1979-06-29

申请号：FR7831283

申请日：1978-10-31

Applicant: IBM

Inventor： CHEATHAM SAMUEL D ,  ROBINSON NEIL L ,  SMATHERS EDMOND W

IPC: G11B5/127 ,  G11B5/23 ,  G11B5/22

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：CA1119720A

公开(公告)日：1982-03-09

申请号：CA309374

申请日：1978-08-15

Applicant: IBM

Inventor： CHEATHAM SAMUEL D ,  ROBINSON NEIL L ,  SMATHERS EDMOND W

IPC: G11B5/127 ,  G11B5/23 ,  G11B5/25

Abstract: An AC magnetic erase head having improved AC erase characteristics, the magnetic head being formed of two half core 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：CA1111553A

公开(公告)日：1981-10-27

申请号：CA292764

申请日：1977-12-09

Applicant: IBM

Inventor： MARINO PETER T ,  SHELLEDY FRANK B ,  SMATHERS EDMOND W

IPC: G11B5/127 ,  G11B5/187 ,  G11B5/265 ,  G11B5/588 ,  G11B15/467 ,  G11B5/00

Abstract: MINOR BIT REDUCTION ON A MAGNETIC HEAD A magnetic head assembly for cooperating with a relatively moving medium, on which servo information and data information is recorded, and for reading and/or writing on said medium and for erasing said medium is fabricated so that the effect of pickup interference or unwanted signals during playback is reduced. The magnetic head assembly incorporates a geometry which shifts the signal envelope of the interfering signal so that it is in phase with the signal envelope of the desired signal. The preferred geometry is to dimension the head core so that the distance between two gaps or between a single gap and the edge of the core is equal to the distance between the servo tracks on said media. Additionally, the gap of the head has a gap null occurring at the frequency of the interfering signal.