Rotatable Recording Head Actuator for Tape Drive Azimuth Correction
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Solution Overview
Problem
Tape drives face challenges with track misregistration (TMR) due to angular misalignment and tape dimensional stability (TDS), leading to errors in data reading and writing, as the recording head's read and write elements do not maintain consistent spacing with the tape tracks due to variations in temperature, humidity, and pressure.
Innovation Solution
A recording head actuator assembly with a dynamic azimuth control (DAC) mechanism, featuring a flexure pivot assembly and a linear voice coil actuator, allows the recording head to rotate about a axis, adjusting the azimuth angle to correct misalignment and maintain accurate tracking of tape tracks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the recording head uses fixed read and write elements with unchanged spacing, then the structure is simple and manufacturing is easy, but track misregistration occurs due to tape dimensional stability variations
Solution Approach 1:
The patent applies the dynamics principle by making the recording head rotatable about an azimuth axis, transforming it from a fixed structure to a dynamic one. The head can now change its angular position relative to the tape to compensate for tape dimensional stability variations. This is achieved through a rotation driver mechanism that allows the head to rotate dynamically during operation, resolving the contradiction between manufacturing simplicity and alignment precision.
Solution Approach 2:
The patent changes the angular parameter (azimuth angle) of the recording head to compensate for tape dimensional variations. By adjusting the head's rotational position, the system adapts to changes in tape dimensions caused by environmental factors, thereby maintaining proper alignment between read/write elements and tape tracks without requiring complex manufacturing tolerances.
2Reliability
If the recording head is made rotatable to correct angular misalignment, then track misregistration is reduced, but the device complexity increases
Solution Approach 1:
The recording head is transformed from a static component to a dynamic one capable of rotation about an azimuth axis. This dynamic capability allows the head to actively correct angular misalignment and track errors by adjusting its orientation in real-time, significantly improving tracking accuracy and reliability despite the added mechanical complexity.
Solution Approach 2:
The system incorporates feedback through track error detection mechanisms that monitor misalignment between the recording head and tape tracks. This feedback information is used to control the rotation driver, which adjusts the head's angular position to minimize tracking errors, creating a closed-loop control system that enhances reliability.
3Manufacturing precision
If the recording head rotates to adjust azimuth angle, then angular misalignment is corrected, but the mechanism requires additional components
Solution Approach 1:
The recording head assembly is made dynamic by introducing a rotation mechanism about the azimuth axis. This allows the head to adjust its angular position to correct misalignment, transforming a static manufacturing precision problem into a dynamic adjustment capability that compensates for dimensional variations during operation.
Solution Approach 2:
The system changes the azimuth angle parameter of the recording head to correct alignment errors. By adjusting this angular parameter dynamically, the system compensates for tape dimensional stability variations without requiring extremely tight manufacturing tolerances on the head components themselves.
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 effectively reduces track misregistration errors by dynamically adjusting the recording head's position relative to the tape, ensuring reliable data storage and increased storage capacity by maintaining precise alignment despite environmental changes.
Implementation Method 1
a linear voice coil actuator operable to generate an electromagnetic force to rotate the recording head about an azimuth axis
Implementation Method 2
The DAC assembly includes a rotation driver and a flexure pivot assembly including a plurality of flexure elements arranged to support the recording head actuator and having a hinge axis coinciding with the rotation axis of the recording head actuator
Data Source
AI summary
A recording head actuator assembly for correcting for tape mis-registration (TMR) in a tape drive. The assembly includes a recording head actuator including a recording head and actuators for laterally positioning the head relative to tracks of a tape. The assembly also includes a dynamic azimuth control (DAC) assembly that includes a flexural pivot and a rotation driver. The rotation driver applies a driving force on the flexural pivot causing the flexural pivot to rotate about a hinge axis and the head to rotate about a rotation axis passing through the head, from a first azimuth angle to a second azimuth angle. The rotation axis and the hinge axis coincide, and the rotation axis of the head is transverse to a direction of tape travel. In some useful implementations, the flexural pivot may include a planar outer flexure and a planar inner flexure arranged as a cross strip pivot.