| 摘要 |
Apparatus for reducing mechanical resonances in a disc drive printed circuit board to reduce acoustic emissions and improve mechanical shock sensing and reporting. A constrain layer comprising a thin layer of rigid, stiffening material is disposed adjacent to the exterior surface of the base portion of a base deck of the disc drive. A vibro-acoustic isolator comprising a thin layer of dampening material, is disposed adjacent the constrain layer and the printed circuit board, the vibro-acoustic isolator and the constrain layer are secured to the base portion of the base deck using conventional fasteners. The vibro-acoustic isolator serves to isolate the printed circuit board from the constrain layer and at the same time dampen mechanical resonances established in the printed circuit board, in conjunction with the stiffening provided by the constrain layer. The constrain layer and vibro-acoustic isolator thus reduce acoustic emissions generated by resonances established in the printed circuit board, as well as reducing the potential for false triggering of a shock sensor mounted to the printed circuit board and used to detect shock events encountered by the disc drive.
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