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Thermally Activated Micropositioner Disclosure Number: IPCOM000042053D
Original Publication Date: 1984-Mar-01
Included in the Prior Art Database: 2005-Feb-03

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Cooper, ES [+details]


In magnetic disk files, a magnetic transducer-positioning system functions to position the read/write magnetic transducers over the center of a data track. Generally, such systems employ a closed-loop servo system that includes a servo transducer cooperating with prerecorded servo tracks on one disk surface. The positioning system includes a carriage assembly which moves the servo transducer and one or more data transducers conjointly. When the servo transducer is caused to follow a servo track, the read/write transducers follow their corresponding data tracks on other surfaces. As track densities increase above the range of 1500 to 2000 tracks per inch, temperature changes within the file tend to cause the servo transducer to be offset from the read/write transducers.