HDD Head Suspension Posture Correction via Laser
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Solution Overview
Problem
Existing methods for correcting the static posture of a head portion in hard disk drives suffer from variations among sample head suspensions during calibration, leading to decreased correction accuracy due to unconsidered variations in pitch and roll angles.
Innovation Solution
A correction recipe-table is prepared that accounts for variations in static posture angle changes of sample head suspensions, allowing for the selection of a correction recipe that minimizes expected variations in the static posture angle of the objective head suspension, thereby improving accuracy and reducing variations post-correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a correction recipe-table is prepared without considering variations among sample head suspensions, then the correction process can be completed with minimum number of laser irradiation, but great variation in pitch angle and roll angle occurs due to correction, deteriorating correction accuracy
Solution Approach 1:
The patent changes the parameters of the correction recipe-table by incorporating statistical data (mean values and standard deviations) of static posture angle changes from multiple sample head suspensions. This allows the system to select correction recipes that minimize expected variation in pitch and roll angles, thereby improving correction accuracy while maintaining efficient laser irradiation processes.
Solution Approach 2:
The patent implements a feedback mechanism where calibration data from multiple sample head suspensions is collected and analyzed. The correction recipe-table is prepared based on this feedback data, allowing the system to anticipate and compensate for variations in individual head suspensions, thus reducing correction accuracy deterioration.
2Manufacturing precision
If calibration is performed on multiple sample head suspensions to account for variations, then correction accuracy can be improved, but the complexity of preparing the correction recipe-table increases
Solution Approach 1:
The patent transforms complex calibration data into simplified statistical parameters (mean values and standard deviations) that can be efficiently processed and stored in the correction recipe-table. This parameter transformation reduces the complexity of recipe preparation while maintaining high correction accuracy through statistical analysis of multiple samples.
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
This approach significantly reduces variations in the static posture angle after correction, enhancing the accuracy of the pitch and roll angle correction process, and ensuring the head portion is aligned with target angles more precisely.
Implementation Method 1
laser beams are irradiated on the selected irradiation lines in turn
Implementation Method 2
laser beams are irradiated on the selected irradiation lines in turn... so that the pitch angle and the roll angle of the head portion are corrected
Data Source
AI summary
A static posture correcting apparatus has a controller preparing a correction recipe-table, a measuring unit measuring a pitch angle and a roll angle of a head portion of a flexure of a head suspension, a laser irradiating unit irradiating laser beams on irradiation lines of a flexure of an objective head suspension, the controller selecting an effectual correction recipe from the correction recipe-table and controlling the laser irradiating section to irradiate laser beams on the irradiation lines of the flexure of the objective head suspension according to the selected correction recipe, wherein the controller considers variations among reference values of pitch angle and roll angle changes of the sample head suspensions when preparing the correction recipe-table and selects the recipe so as to diminish an expected variation in target static posture angle characteristic due to correction.