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Use of clamp seal to prevent contamination migration

IP.com Disclosure Number: IPCOM000100680D
Publication Date: 2005-Mar-16
Document File: 2 page(s) / 264K

Publishing Venue

The IP.com Prior Art Database

Abstract

Disclosed is an encapsulation method to solve the particle problems generated during the disk clamp screwing process by preventing the generated particles from spreading into the disk enclosure volume.

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Use of clamp seal to prevent contamination migration

  This invention solves the particle problems generated during the disk clamp screwing process by preventing the generated particles from spreading into the disk enclosure volume. In most HDD drives, 3 to 6 screws are used to tightly clamp the platters to the spindle motor hub through a mechanical combination of a clamp and hub. Particles are potentially generated due to the tooling interactions with the clamp screws and screw holes on the clamp as well as the spindle hub thread holes during the clamp screwing process. The tightening process of the clamp screws after the balancing process especially generates most particles, large enough to critically damage an HDD. Tests show that the screws, clamp, and spindle motor hub are main particle generating sources during the tightening process.

The most common procedure to control this particle generation has been to decrease the clamping torque strength so as to reduce the particle size and number passively. However, lower clamping torque inherently leads to downgrading the clamp performance. This disclosure proposes an active measure to reduce particles generated from the clamp screwing process in a disk enclosure of an HDD. The encapsulation of the top clamp surface by an adhesive seal proved to prevent the generated particles from migrating into the disk enclosure. The effect of this clamp seal was tested by the Spray/SEM analysis. The result shows that the numbers of generated particles in the disk enclosure are reduced by 80% to 85% on average. Especially, the particles generated from the screws and clamp were examined to be reduced by about 93% to 95%.

Figure 1 illustrates the encapsulation method of the clamp surface by an adhesive seal. T...