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Optimizing Vibration Isolation Of Flex Circuits In Hard Disk Drives, M. R. Brake, Jonathan A. Wickert
Optimizing Vibration Isolation Of Flex Circuits In Hard Disk Drives, M. R. Brake, Jonathan A. Wickert
Jonathan A. Wickert
A "flex circuit" is a laminate of polyimide substrate, adhesive, and copper conductors that is used to connect the stationary electronic components in a computer hard disk drive to the rotating arm that positions read/write heads above the disks. The flex circuit's transverse and longitudinal vibrations couple with the arm, and those motions, although seemingly small, degrade performance during seek operations from one data track to another. The flex circuit and arm mechanism is defined by a number of geometric parameters, and some latitude is available at the design stage for choosing dimensions and angles so as to minimize vibration …
Vibration Of Flex Circuits In Hard Disk Drives, Jonathan A. Wickert
Vibration Of Flex Circuits In Hard Disk Drives, Jonathan A. Wickert
Jonathan A. Wickert
A flex circuit connects the stationary electronic components in a hard disk drive to the rotating arm that carries the read/write heads and positions them above data tracks on the disk. Flex circuits are conventionally formed as a laminate of polyimide substrate, adhesive, and copper conductors. Deformation of a flex circuit is discussed in the context of the following stages: the initial unstressed shape, configurations in which stresses set and relax in response to elevated temperature, equilibrium, and small amplitude vibration. The model involves displacements of the flex circuit in the directions tangent and normal to the local equilibrium shape, …