InnovationQ will be updated on Sunday, Oct. 22, from 10am ET - noon. You may experience brief service interruptions during that time.
Browse Prior Art Database

Damper Plate with Compliant Contact

IP.com Disclosure Number: IPCOM000202985D
Publication Date: 2011-Jan-13
Document File: 2 page(s) / 48K

Publishing Venue

The IP.com Prior Art Database


Currently, FIPG donut contact is used to confine damper plate motion during shock events. However FIPG would lift damper plate during HDD manufacturing rework due to FIPG's adhesion to damper plate. The disclosed damper plate (DP) has compliant contacts, which nominally contact top cover.

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 93% of the total text.

Page 01 of 2

Damper Plate with Compliant Contact

    The disclosed hard disk drive (HDD) damper plate (DP) has compliant contacts, which nominally contact the top cover. The compliant contacts have a smaller pushing force to the cover than solid structure as the worst assembly tolerance can be several tenths of a millimeter, yet it is stiff enough to prevent the damper plate from disk contact during shock events.

Advantages of the disclosed damper plate include:
- Small and managable pushing force to cover,
- Single part, no additional FIPG contact on cover,
- No adhesion between DPs and DP to cover.
- HDD manufacturing process remains the same

One preferred design of the disclosed damper plate is shown in Fig. 1.

Compliant contacts

(This page contains 00 pictures or other non-text object)

Fig. 1 Damper plate with compliant contacts

If designs provide similar contact stiffness, variation of the disclosure can be designed, but not limited to the ones shown in Fig. 1 and 2.

Compliant contact

Fig. 2 Alternative damper plate compliant contact design

Disclosed design with contact stiffness = 1E3 N/m can effectively restrain damper plate to disk gap change.

The pushing force of the damper plate contacts to the cover is less than 2 N under 3 Sigma tolerance between damper plate to cover.

(This page contains 01 pictures or other non-text object)


Page 02 of 2

CBD Disk/Damper Plate Gap Change



Contact Stiffness K

= 103




Gap change (mm)







Gap Change...