Media with pre-recorded alignment transitions

Details Media with pre-recorded alignment transitions Media with pre-recorded alignment transitions

2005-05-24

2005-05-24

Hudspeth, David (Department: 2651)

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

C360S077120

Reexamination Certificate

active

06898045

ABSTRACT:
A device for precision alignment of a write element of a tape head to a transport direction of a media that is transported across the tape head is disclosed. The tape head includes at least one alignment element that is cofabricated with the write element so that both the write element and the alignment element have a fixed orientation with respect to a magnetic axis of the tape head. The alignment element and the write element can be fabricated on the tape head using standard microelectronic photolithographic processes. Preferably, the tape head includes a plurality of alignment elements. Those alignment elements are operative to write alignment transitions onto the media. The alignment transitions can be observed to determine if they are indicative of the write element having a predetermined orientation with respect to the transport direction. A read transducer can be used to generate signals from the alignment transitions and those signals can be analyzed to determine if the predetermined orientation of the write element has been achieved. The tape head can include horizontal and/or vertical elements for a gross visual alignment of the tape head to the media. The alignment transitions can be read by a data element of a separate data head. A signal from the data element can be used to adjust the azimuth of the data head with respect to a direction of transport. In servo writer applications where servo code is prerecorded on the media, the alignment transitions can be used to align the write elements of a servo write head to the transport direction of the media so that inter band skew between adjacent servo bands is significantly reduced.

REFERENCES:
patent: 6236525 (2001-05-01), Cates et al.
patent: 6430008 (2002-08-01), Trabert et al.
patent: 6433949 (2002-08-01), Murphy et al.

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