Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Patent
1997-05-09
1999-12-07
Psitos, Aristotelis M.
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
360 7703, 360 7712, 2505593, G11B 2102
Patent
active
059993596
ABSTRACT:
A head positioning system achieves higher track alignment accuracy for audio, video, or data recording or playback. In a digital tape drive embodiment, the positioning system includes a servo read head for receiving conventional servo code from the tape, a voice coil motor that moves the head in relation to the tape, a light source mounted to move with the head, a lateral effect photodiode that is illuminated by the light source to monitor misalignment of the head and tape, and a control circuit. The positioning system locates the head in alignment with the tape when conventional positioning in response to the servo code is not possible, such as when the tape is not moving. Movement of the light source modulates two currents provided by the photodiode. The control circuit drives the source according to the normalized sum of the currents and drives the motor according to the difference of the currents. Alignment on smaller width tracks, improved track access time, improved reversal at end of tape, increased track density, and increasing storage capacity result. Alternate embodiments of the positioning system include disk media instead of tape, and include heads responsive to optically recorded signals such as used with a compact disk.
REFERENCES:
patent: 3886595 (1975-05-01), Swaim et al.
patent: 4843494 (1989-06-01), Cronin et al.
patent: 4987293 (1991-01-01), Baciak
patent: 5392173 (1995-02-01), Kinoshita et al.
"Optoelectronic Components Catalog", pp. 3-9, 30-36, UDT Sensors Sensors, Inc., Hawthorne, Ca.
Davidson Dan I.
Hewlett-Packard Co.
Psitos Aristotelis M.
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