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Drive Disk Actuator to support High Track Densities using High Stiffness coating

IP.com Disclosure Number: IPCOM000031477D
Publication Date: 2004-Sep-27
Document File: 3 page(s) / 29K

Publishing Venue

The IP.com Prior Art Database

Abstract

A disk drive Actuator using High Stiffness coating is disclosed. The proposed coating is diamond or diamond like carbon deposited via chemical vapor deposition. This is a cost effective manner to increase the stiffness of actuator bodies to support higher track densities in HDD storage devices.

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THIS COPY WAS MADE FROM AN INTERNAL HITACHI DOCUMENT AND NOT FROM THE PUBLISHED BOOK

HSJ820040077 Bob Martin/US/HGST@HGST Brad Johnson

Drive Disk Actuator to support High Track Densities using High Stiffness coating

Disk Drive Actuator to support High Track Densities using High Stiffness coating

The storage capacity of HDD's continues to increase at a dramatic pace. Increasing the track density on the disk surface is a key method of achieving this. It is expected that this trend will continue in the future. In order to support these increases in track density the mechanical bandwidth of the HDD's actuator system must be continually improved. These means that the inherent mechanical resonances present in actuator structures, which create off-track disturbances, much be continually increased in frequency, reduced in amplitude or completely eliminated. The claim made below is a method that will improve the mechanical bandwidth of disk drive actuator in a cost effective and simple manner.

One of the key technologies commonly proposed for very high track density HDD's is the use of two stage actuators. This technology splits the single stage actuator in use today into two devices, one of which can be very small and light. This allows the second stage to achieve very high mechanical bandwidths, thereby supporting high track densities. Unfortunately, the implementation of two stage actuators significantly increases system cost. The component count is typically more than doubled when two stage actuators are used. The complexity of controlling a two stage system increases significantly as well. This leads to reductions in system reliability and production yields.

An alternate method that has been proposed for increasing the mechanical bandwidth of actuator systems is through the use of materials with a high specific stiffness (modulus/density) for the actuator body. Traditional actuator bodies are machined from common aluminum alloys. Since aluminum is already relatively high in specific stiffness the search for improved materials generally forces one to consider ceramics or composites. The traditional machined aluminum actuator body has the key virtue of being very low in cost. Alternative materials are always much higher in cost. They are also difficult to fabricate to the precision and complexity required for an HDD actuator. Reference US Patents 6466414 and 6151198.

Summary of Invention:

What is proposed is an aluminum actuator body structure that is plated, sputter...