Dynamic magnetic information storage or retrieval – Record transport with head stationary during transducing – Drum record
Patent
1985-04-12
1988-05-10
Wolff, John H.
Dynamic magnetic information storage or retrieval
Record transport with head stationary during transducing
Drum record
360 78, 360 98, 310 13, 318 38, G11B 555, G11B 5012, G11B 2108
Patent
active
047439874
ABSTRACT:
A dual motor linear actuator is disclosed for use in a magnetic disc drive device. It includes a carriage reciprocatably guided between a pair of guide rails, with the accessing transducers being mounted to its inner end. Separate rectangular drive coils are affixed in symmetrical outboard relationship at the sides of the body of the carriage. The actuator assembly further includes two pairs of slab shaped magnets mounted to E-shaped magnet support structures that are integrally formed with the base of the disc drive device. The magnets are mounted to form two air gaps that are symmetrically disposed relative to a center plane and so that they respectively cooperate with the drive coils to apply motive forces on the carriage generally along two lines that are equidistantly spaced from the aforesaid plane of symmetry. The outer ends of pole pieces of the two magnet support structures are rigidly interconnected by a single plate that acts as an end pole piece for both magnet support structures.
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Miscellaneous discovery items (68), including descriptions and other documents in Civil Actions C83 20364 WAI and 84 20761 WAI, U.S. District Court, Northern District of California, San Jose Calif., submitted by Applicants and directed to actuators of Cipher Data Products, Inc., Sequential Information Systems, Inc. and Western Dynex, Inc.
Brown Stanley F.
Farmer Paul L.
Gibeau Frank C.
Plonczak Garold W.
Atasi Corporation
MacDonald Thomas S.
MacPherson Alan H.
Winters Paul J.
Wolff John H.
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