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Spacer Ring with Compliant Cavity or Groove for Tuning Disk Mode Frequencies

IP.com Disclosure Number: IPCOM000031095D
Publication Date: 2004-Sep-10
Document File: 3 page(s) / 56K

Publishing Venue

The IP.com Prior Art Database

Abstract

A disk spacer ring in a hard disk drive has a stress distributing cavity to reduce the stress concentration on the surface of adjacent disks. The cavity comprises a single, completely circumferential annular slot located in the perimeter side wall of the ring.

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Spacer Ring with Compliant Cavity or Groove for Tuning Disk Mode Frequencies

One of the challenges in disk drive development is the ability to tune resonance frequencies such that disturbances are minimized. These disturbance happen in all of the drive components. Of particular interest here is the ability to find ways to move resonant modes of disk platter by modifying the boundary conditions that are imposed on the disk(s). Commonly done in the past is the method of changing the area of contact between disk clamp and disk and also between disk spacer and disk. One difficulty with such method is the fact that the contact areas are typically imposed by other design and manufacturing requirements.

This proposed method allows the contact between disk and disk spacer to remain the same while effectively shifts the frequencies and reduces the amplitudes of disk modes.

The proposal is to use a compliant cavity or groove along the side of the disk spacer as shown below. Typical dimensions are also displayed in the following picture. The major advantage of this invention is such that, by changing the size (width and height of the groove), frequencies can be tuned to any desired or predetermined locations, i.e. away from resonant modes of other components. Further optimization can also be achieved with different applications.

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The figure below shows the frequency spectrum by Laser Doppler Vi...