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Application of Cellular Structures on Disk Drive Suspensions

IP.com Disclosure Number: IPCOM000014881D
Original Publication Date: 2000-Feb-01
Included in the Prior Art Database: 2003-Jun-20
Document File: 2 page(s) / 152K

Publishing Venue

IBM

Abstract

A novel approach is described to reduce the vertical stiffness of suspensions used in hard disk drives without compromising the resonant frequencies as well as its lateral or horizontal stiffness. Hard disk drives with faster access times requires a higher servo bandwidth. Higher servo bandwidths can be realized by either increasing the resonant frequencies of the hard disk drives mechanical components or reducing its mechanical gain. The resonant frequencies of suspensions can be increased by reducing its scale. However, reducing the length of the suspension also increases the vertical stiffness or spring rate which impacts the slider flying height. Reducing the spring rate to accomodate the slider flying height budget would mean reduction in resonant frequencies and reduction in lateral or horizontal stiffness.

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Application of Cellular Structures on Disk Drive Suspensions

   A novel approach is described to reduce the vertical stiffness of suspensions
used in hard disk drives without compromising the resonant frequencies as well as
its lateral or horizontal stiffness. Hard disk drives with faster access times
requires a higher servo bandwidth. Higher servo bandwidths can be realized by
either increasing the resonant frequencies of the hard disk drives mechanical
components or reducing its mechanical gain. The resonant frequencies of
suspensions can be increased by reducing its scale. However, reducing the length
of the suspension also increases the vertical stiffness or spring rate which
impacts the slider flying height. Reducing the spring rate to accomodate the
slider flying height budget would mean reduction in resonant frequencies and
reduction in lateral or horizontal stiffness.

Depending on the spring rate desired, the load beam and its spring legs can be
fully etched or partial etched with arrays of cellular patterns depending on the
directions of stiffness required. For example, a square cellular pattern can be
etched on the spring legs if anisotropy is required (two stiff and two compliant
directions). If isotropy is required (same stiffness in all directions), a
pattern of hexagonal arrays can be etched on the spring legs as shown in Figure 1
and Figure 2.

Figure 1

1

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Figure 2

The desired spring rate, resonant...