Tape Head Assembly With Piezo Actuation and Counterweight Stabilization
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Solution Overview
Problem
Existing tape drives face challenges in accurately positioning tape heads over a tape due to off-track write or read operations caused by lateral tape motion and vibrations, necessitating higher bandwidth servo control and faster actuators.
Innovation Solution
A tape head assembly incorporating a piezoelectric element, counterweight, and springs to stabilize the head block, allowing precise alignment and cancellation of reaction forces during actuation, thereby enhancing servo band width and increasing tracks per inch.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a magnetic write transducer is moved to position data over the media, then data writing is achieved, but off-track write operations occur due to lateral tape motion and vibrations
Solution Approach 1:
A counterweight is integrated into the head actuator module, positioned opposite the write transducer relative to the head carriage centerline. This counterweight generates a counterbalancing moment that offsets the destabilizing moment caused by lateral tape motion and vibrations, thereby improving positioning precision and reducing off-track write operations
Solution Approach 2:
The counterweight is pre-positioned and configured to provide counterbalancing force before lateral tape motion occurs. By establishing the counterbalancing moment in advance, the system proactively compensates for upcoming destabilizing forces, maintaining write transducer positioning accuracy during tape movement
2Manufacturing precision
If a head actuator module is used to position the tape head, then accurate positioning is achieved, but the actuator bandwidth is limited
Solution Approach 1:
The counterweight reduces the net moment of inertia of the head actuator module by balancing masses. This reduction in effective inertia allows the actuator to respond more quickly to control signals, increasing actuator bandwidth while maintaining positioning accuracy through the counterbalancing effect
3Manufacturing precision
If servo control bandwidth is increased to reduce off-track operations, then positioning accuracy improves, but actuator speed requirements increase
Solution Approach 1:
By integrating the counterweight into the head actuator module, the system reduces the effective moment of inertia that the actuator must accelerate. This allows the actuator to achieve higher bandwidth and respond faster to servo control signals, enabling increased positioning accuracy without requiring proportionally higher actuator speeds
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enables accurate and stable positioning of tape heads, increasing servo band width and tracks per inch without inducing vibrations in the voice coil motor actuators, thus improving data storage capacity.
Implementation Method 1
a piezoelectric element disposed in contact with the second end of the head block
Data Source
AI summary
The present disclosure generally relates to a tape drive comprising a tape head assembly. The tape head assembly comprises a head block having a first end and a second end, the second end being opposite the first end, one or more tape head modules disposed on the head block, the one or more tape head modules each comprising a plurality of data elements, a first spring disposed at the first end of the head block, a piezoelectric element disposed in contact with the second end of the head block, a counterweight disposed adjacent to the second end of the head block, and a second spring disposed adjacent to the second end of the head block. The counterweight has a first weight. The head block and the one or more tape head modules have a collective second weight. The first weight is equal to or greater than the second weight.