Systems and methods for identifying problems with PZT elements of micro-actuators
First Claim
1. A system for identifying problems with a PZT element of a micro-actuator, comprising:
- a voltage driver operably connected to a reference micro-actuator, the voltage driver being configured to cause the reference micro-actuator to vibrate at a reference resonance;
a test micro-actuator, configured to vibrate at a test resonance when induced by vibrations from the reference micro-actuator; and
,a processor, configured to compare at least one characteristic of the reference resonance and at least one corresponding characteristic of the test resonance.
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Abstract
Systems and methods for identifying problems with PZT elements of micro-actuators are provided. In certain example embodiments, a voltage (e.g., a sine voltage) may be applied to a reference unit causing it as well as a test unit to vibrate. Characteristics of the respective resonances (e.g., frequency, amplitude, phase, etc.) may be compared (e.g., by a processor) to determine whether there are problems with the test unit. The reference unit may include an HGA or an HSA of a hard disk drive device. The test unit may include corresponding parts for inspection. Such techniques make it possible to detect problems with PZT elements when there is only one PZT element per micro-actuator.
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Citations
17 Claims
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1. A system for identifying problems with a PZT element of a micro-actuator, comprising:
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a voltage driver operably connected to a reference micro-actuator, the voltage driver being configured to cause the reference micro-actuator to vibrate at a reference resonance; a test micro-actuator, configured to vibrate at a test resonance when induced by vibrations from the reference micro-actuator; and
,a processor, configured to compare at least one characteristic of the reference resonance and at least one corresponding characteristic of the test resonance. - View Dependent Claims (2, 3, 4, 5)
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6. A method for identifying problems with a PZT element of a micro-actuator, the method comprising:
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providing a reference micro-actuator and a test micro-actuator; applying a voltage to the reference micro-actuator to induce a reference resonance in the reference micro-actuator, the reference resonance causing a test resonance in the test micro-actuator; measuring the reference resonance and the test resonance; and
,comparing at least one characteristic of the reference resonance and at least one corresponding characteristic of the test resonance. - View Dependent Claims (7, 8, 9)
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10. A method for identifying problems with a PZT element of a micro-actuator of a disk drive device including a head stack assembly including a plurality of head gimbal assemblies, each head gimbal assembly having a slider with a read/write head thereon and a drive arm connected to the head gimbal assembly, the method comprising:
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applying a voltage to the head stack assembly to induce resonances in each micro-actuator; measuring the induced resonances in each micro-actuator; generating a reference resonance; and
,comparing at least one characteristic of the induced resonances with at least one corresponding characteristic of the reference resonance. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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Specification