System for positioning a head in a transverse reference position

Details System for positioning a head in a transverse reference position System for positioning a head in a transverse reference position

1991-07-30

1994-03-29

Callahan, Timothy P.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 66, 360 7707, 360 7712, G11B 556

Patent

active

052990745

ABSTRACT:
A method of, and an apparatus for, positioning a playback head in a transverse reference position on one edge of a multitrack magnetic tape having no track identification data or other positioning patterns prerecorded thereon. A tape drive unit is provided which has an erase head with an erase gap spanning the complete width of the tape. An alternating current generator circuit is connected to the erase head for supplying thereto a constant frequency alternating current to be written as a transverse head positioning pattern by the erase head on selected part of the tape throughout its width. The positioning pattern is then read by the playback head traveling across the width of the tape from an arbitrary position on the tape, in which the playback head is fully opposed to the positioning pattern, toward one edge of the tape while the tape is being driven longitudinally. The alternating current output from the playback head is of full amplitude when the playback head is fully opposed to the positioning pattern, and gradually decreases in amplitude when the playback head starts overrunning the tape edge. The travel of the playback head across the width of the tape is discontinued when the peak value of the playback head output decreases to a predetermined percentage of that when the playback head is fully opposed to the positioning pattern.

REFERENCES:
patent: 4422111 (1983-12-01), Moeller et al.
patent: 4527202 (1985-07-01), Ohta
patent: 4586094 (1986-04-01), Chambors et al.
patent: 4977468 (1990-12-01), Aruga et al.
patent: 5111347 (1992-05-01), Ono et al.

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