Pick-Up Head Tightness Detection via Timing and Force Adjustment
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Solution Overview
Problem
The varying spacing between sliding rails in disc reading systems affects the pick-up head's movement speed due to differences in tightness, leading to inconsistent performance across different disc reading systems and mechanisms from different manufacturers, which complicates accurate disc reading and user experience.
Innovation Solution
A method and apparatus for detecting and controlling the pick-up head's tightness by moving it between inner and outer areas of a disc reading device using a series of fixed forces and PWM, recording the duration to adjust forces based on detected tightness, thereby improving reading accuracy and user experience.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the pick-up head moves along sliding rails with different spacing, then the velocity of the pick-up head varies, but this leads to inconsistent tightness and binding across different regions and manufacturers
Solution Approach 1:
The patent applies parameter changes by measuring the actual tightness of the pick-up head mechanism and adjusting the servo control parameters accordingly. The system determines a tightness parameter based on the time required for the pick-up head to move between inner and outer areas, then uses this parameter to adjust servo control forces, thereby compensating for manufacturing variations and ensuring consistent performance across different mechanisms and manufacturers.
2Adaptability or versatility
If different manufacturers produce mechanisms with different tightness, then the pick-up head speed varies under the same force, but this complicates accurate disc reading
Solution Approach 1:
The patent implements feedback by measuring the actual tightness of the pick-up head mechanism through timing measurements and using this information to adjust servo control parameters. The system determines tightness based on the time required for the pick-up head to traverse between inner and outer areas, then feeds this information back to adjust the control forces, ensuring accurate disc reading across mechanisms from different manufacturers with varying tightness characteristics.
3Ease of manufacture
If the spacing between sliding rails varies, then the pick-up head experiences different tightness or binding, but this affects reading accuracy
Solution Approach 1:
The patent applies parameter changes by adjusting servo control parameters based on the measured tightness caused by varying sliding rail spacing. The system measures the time required for the pick-up head to move between inner and outer areas to determine tightness, then modifies the control forces accordingly, allowing manufacturers to maintain reasonable tolerances while ensuring accurate disc reading through parameter adjustment.
Data Source
AI summary
A method and apparatus for detecting tightness of a pick-up head, and a method and apparatus for controlling the moving of the pick-up head are disclosed. The method for detecting the tightness of the pick-up head includes moving the pick-up head to an inner area of the disc reading device when then disc reading device is powered on, moving the pick-up head to an outer area of the disc reading device within a predetermined time period, moving the pick-up head from the outer area of the disc reading device to the inner area at a constant speed by a first fixed force, and recording the moving duration for moving the pick-up head from the outer area of the disc reading device to the inner area at the constant speed.