G - Physics – 11 – B
Patent
G - Physics
11
B
352/24.31
G11B 5/54 (2006.01) G11B 5/55 (2006.01) G11B 21/02 (2006.01)
Patent
CA 1212759
ABSTRACT A disk memory assembly has a carriage structure which has a coil assembly secured to one end and is supported by bearings for rectilinear movement in response to the energization of a voice coil. The carriage has four fins, a tower member and a horizontal shoe member. The tower supports a plurality of arms carrying heads. The heads read or write upon disks rotated by a spindle about a spindle axis. A servo system is provided to energize the coil to position the heads at the desired locations on the disks. Rectilinear movement of the carriage in response to the servo excites resonances in the carriage. The carriage structure is designed to minimize low frequency resonance modes and to increase the frequency of the first major resonance mode of the carriage to improve servo control. The four fins of the carriage are orthogonally disposed with respect to one another and disposed at 45° angles with respect to the spindle axis. The fins are joined along their inner edges to form a central beam and extend from the coil to the tower and shoe members of the carriage. The lower pair of fins extends along the bottom of the shoe to provide rigidity in the shoe. The carriage structure minimizes low frequency bending modes and remains substantially entirely in tension and compression at higher frequencies to increase the frequency of the first major resonance mode.
425027
Magnetic Peripherals Inc.
Smart & Biggar
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