Recording Head Surface Charge Control Circuit
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Solution Overview
Problem
Existing data storage systems face challenges in achieving fast and precise manipulation of transducing heads relative to data storage media, as conventional heating methods are slow and imprecise, and the use of bleeder resistors in charge control circuits leads to voltage loss and reduced substrate charge effectiveness.
Innovation Solution
A charge control circuit with a substrate electrically isolated from ground and connected between surface charge circuitry and a non-zero fixed voltage, allowing for the application of a substrate charge at a predetermined frequency to alter head-media spacing, maximizing voltage delivery and optimizing head-media interaction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional heating methods are used to manipulate transducing head position, then the system structure remains simple, but the manipulation speed and precision are slow and imprecise
Solution Approach 1:
The patent replaces conventional thermal heating mechanisms with an electrostatic field-based control system. Surface charge circuitry generates controlled electrostatic charges that act on the transducing head substrate, enabling rapid and precise position manipulation without the slow thermal response inherent in heating-based methods.
Solution Approach 2:
The patent dynamically changes the electrostatic charge parameters (magnitude, distribution, and timing) applied to different regions of the transducing head substrate. By modulating these electrical parameters, the system achieves fast and precise control of head position and orientation, overcoming the limitations of fixed thermal profiles.
2Reliability
If bleeder resistors are used in charge control circuits to connect surface charge circuitry to ground, then circuit stability improves, but voltage loss occurs and substrate charge effectiveness is reduced
Solution Approach 1:
The patent extracts and eliminates the bleeder resistor component from the charge control circuit. By removing this resistive element that caused voltage division and energy loss, the system achieves full voltage delivery to the substrate while maintaining circuit stability through alternative control mechanisms.
Solution Approach 2:
The patent introduces isolated voltage sources as intermediaries between the charge control circuitry and the substrate. These isolated sources act as mediators that transfer charge effectively without the voltage loss associated with resistive connections, thereby maintaining both stability and voltage efficiency.
3Stability of the object's composition
If the substrate is electrically connected to ground through bleeder resistors, then electrical stability is improved, but the maximum voltage available for charging the transducing head is reduced
Solution Approach 1:
The patent transitions from a static grounded configuration to a dynamic isolated voltage system. The substrate voltage can be dynamically adjusted to optimal levels for charging, while electrical stability is maintained through controlled isolation rather than fixed ground connection, enabling both high voltage availability and stability.
Solution Approach 2:
The patent adds an electrical isolation dimension to the circuit architecture. By introducing galvanic isolation between the substrate and ground reference, the system creates an independent voltage domain that can operate at maximum potential without being constrained by ground-referenced resistive paths, thereby preserving voltage while ensuring stability.
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 solution enables faster and more precise control of head-media spacing, reducing wear and contamination, and facilitating high-fidelity contact detection, while maintaining maximum voltage for efficient data access and storage.
Implementation Method 1
application of an oscillating charge at a specific frequency can facilitate high fidelity contact detection
Implementation Method 2
utilizing a surface charge circuitry to generate electrostatic charge that can attract the transducing head with respect to the data storage medium
Implementation Method 3
a data storage system, in various embodiments, has no deliberate electrical connection at a wafer lever between surface charge circuitry and a preamplifier ground
Data Source
AI summary
A data recording head may consist of at least a charge control circuit that has a substrate, ground, surface charge circuitry, and data reader circuitry. The substrate may be electrically isolated from the ground and electrically connected between the surface charge circuitry and a non-zero fixed voltage. The surface charge circuitry can be configured to apply a varying substrate charge to the substrate at a predetermined frequency to alter a head media spacing between the substrate and a data storage medium.