Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Patent
1981-06-04
1984-08-07
Wolff, John H.
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
360 721, 360 741, G11B 2108, G11B 1548
Patent
active
044646895
ABSTRACT:
A random access read/write unit includes radial and angular positioning systems for accessing one of a plurality of storage locations or positions arranged in a two dimensional coordinate system on a storage medium such as a magnetic disc. The radial positioning system includes coarse and fine positioning devices for accurately locating a read/write mechanism or "head" at one of a plurality of concentric tracks located on the magnetic disc. The coarse positioning device includes a plurality of sensors which provide information denoting the position of the read/write head relative to the desired track. The fine positioning device is engaged once the coarse positioning device has located the head at approximately the desired track, and includes means for finally positioning the head accurately with respect to the desired track. An angular positioning system rotates the disc relative to the head, so that the head accesses any one of a plurality of angular sectors disposed about the disc. The random access unit provides a high degree of reliability even after repeated usage, is relatively inexpensive to manufacture, records and plays digital information and/or high quality audio recordings and is quiet in operation.
REFERENCES:
patent: 4066349 (1978-01-01), Flint
patent: 4103314 (1978-07-01), Case
patent: 4124872 (1978-11-01), Probst
patent: 4135217 (1979-01-01), Jacques et al.
patent: 4352131 (1982-09-01), Van Herk
Education & Informations Systems, Inc.
Wolff John H.
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