| 摘要 |
In a rotating disc information storage system, a cover is designed to induct laminary airflow at the disc surface and to reduce the impurity level of the disc atmosphere. The laminar airflow results from the shape of the cover which closely conforms to the contours of the disc and its drive spindle and is closely spaced thereto. The impurity level is reduced by the spiral airflow produced by disc rotation being provided to a divergent filter duct and filter to capture airborn particles. The divergent filter duct and opening to the duct are formed between the cover and a wall around the periphery of the disc. The position of the wall is mechanically adjustable to control the spiral airflow into the filter duct. Air is filtered and returned to the disc storage system.
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