Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the record
Patent
1995-05-12
1998-02-10
Psitos, Aristotelis M.
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the record
360 722, 360 95, 2423332, 242334, 318603, 388809, G11B 1552
Patent
active
057175373
ABSTRACT:
A cartridge of a single reel is inserted and information is recorded and reproduced by a helical scan type using a rotary head. A control pulse is reproduced from a recording signal of a control track of a magnetic tape by a fixed head. A repositioning operation and a high speed search are controlled on the basis of the control pulse. A torque ripple of a capstan motor is previously measured. When the tape runs, a motor drive current is corrected so as to reduce a torque change of one rotation on the basis of the measurement result, thereby improving a wow and flutter. A switching timing of motor coils by Hall sensors is set to an early timing, thereby suppressing a torque fluctuation. A regenerative braking circuit is formed by an OFF timing of a PWM control and a tape back tension is formed by a decrease in torque by the regenerative braking circuit. A tape thread and a tape wrap at the time of the insertion of the cartridge are simultaneously executed.
REFERENCES:
patent: 4398227 (1983-08-01), Anderson
patent: 4628377 (1986-12-01), Harigaya
patent: 4664336 (1987-05-01), Koyama
patent: 4737868 (1988-04-01), Kimura et al.
patent: 4821129 (1989-04-01), Culp
patent: 5325370 (1994-06-01), Cleveland et al.
patent: 5475542 (1995-12-01), Bentley et al.
Sasaki Makoto
Watanabe Shuko
Fujitsu Limited
Habermehl James L.
Psitos Aristotelis M.
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