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Sonic Code Sensor for HDD Actuators and other resonance sensitive components

IP.com Disclosure Number: IPCOM000015747D
Original Publication Date: 2002-Feb-14
Included in the Prior Art Database: 2003-Jun-21

Publishing Venue



Sonic Code Sensor for HDD Actuators and other resonance sensitive components. Actuators in hard disk drives are prone to resonance problems. Slight dimensional variations, even ones that are within tolerances can cause individual arms on an actuator to exhibit undesirable resonance's This sensitivity with the actuator can exist early at the machined level or develop further into the manufacturing process as a result of attaching additional components during assembly. This article describes a relatively simple device consisting of a sound/resonance sensor and a means for providing agitation to individual actuator arms (air nozzle or mechanical device). Each arm resonates in response to the imput from the agitator. A sensor (displacement or optical) would pick up the sound produced by the resonating arm. Automated data processor can record the signal that is produced by each arm and apply appropriate pass/fall criteria based on the vibration or acoustic signature. This same procedure can be applied to assemblies, e.g. HGA to arm, to determined bond quality. 1