Dynamic magnetic information storage or retrieval – Record transport with head stationary during transducing – Drum record
Patent
1994-02-18
1996-01-23
Wolff, John H.
Dynamic magnetic information storage or retrieval
Record transport with head stationary during transducing
Drum record
360 9701, G11B 555
Patent
active
054869650
ABSTRACT:
A rotary information recording/reproducing apparatus has a carriage rotatable by the first and second driving coils about an axis that moves an information recording/reproducing head radially to an associated recording disk for head positioning relative to the disk. The angle between a line connecting the center of the first driving coil and the center of the carriage pivot shaft and a line connecting the head and the center of the carriage pivot shaft is set to be not greater than 90 degrees while the angle formed between the first and second driving coils about the center of the carriage pivot shaft is within the range of from 100 degrees to 150 degrees, whereby reduction in the size and thickness of the apparatus can be achieved. A magnet-yoke assembly, which is subject to a reaction force, is mounted to a base by sheet springs and reaction-force damping members interposed therebetween so that the magnet-yoke assembly is independent from and infinitesimally rotatable relative to the base. The provision of the two driving coils and the reaction-force damping members effectively prevents the carriage pivot system and the disk spindle from being excited by the reaction force to thereby assure a high-speed and highly-accurate head positioning.
REFERENCES:
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Amano Hideaki
Hirai Hiromu
Kohno Takashi
Mori Kenji
Yoshida Takashi
Evans Jefferson
Hitachi , Ltd.
Wolff John H.
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