Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Patent
1986-09-08
1988-12-06
Cardillo, Jr., Raymond F.
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
360 7706, 318696, G11B 556, H02P 800
Patent
active
047899093
ABSTRACT:
A method and apparatus for driving a two-phase motor having two phase coils and a head of a disc recording unit which records information data and servo information on a rotatively driven disc in a manner designed to assure proper placement of the servo tracks and increase the speed of reading and writing information data. The head is driven to first radial locations on the disc by exciting phase coils in an unbalanced condition with two phase currents which have differing non-zero magnitudes, and servo information is written at these locations as the disc rotates. The head is then driven to radial track locations which are predetermined relative to the first locations by first exciting the coils in a balanced condition with respect to two phase currents of substantially equal magnitude which drive the head to second predetermined radial locations, and then reading the servo information with the head at these latter locations and adjusting the location of the head to the predetermined relative locations based on the servo information which has been read.
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Cardillo, Jr. Raymond F.
Fuji Electric Company Ltd.
Robertson David L.
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