Slider Heater High Thermal Conductivity Dielectric Layer
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Solution Overview
Problem
In hard disc drives, the thermal expansion of transducer components causes shape changes and variations in temperature, affecting the accuracy and efficiency of read/write operations, as existing solutions do not effectively manage heat distribution between the heater and the transducer.
Innovation Solution
A slider with a heater and a continuous dielectric layer of high thermal conductivity (at least 20 W/m-K) is positioned between the heater and the transducer, facilitating efficient heat transfer and reducing temperature variations, thereby controlling the protrusion and distance between the transducer and the disc.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a heater is positioned near the transducer to induce thermal expansion and protrusion, then the protrusion efficiency is improved, but the temperature control precision deteriorates due to heat affecting the transducer
Solution Approach 1:
A dielectric layer with high thermal conductivity (at least 20 W/m-K) is positioned between the heater and the transducer. This intermediary layer efficiently conducts heat from the heater to induce thermal expansion in the slider body for protrusion, while simultaneously protecting the transducer from excessive heat exposure, thus maintaining temperature control precision.
2Measurement precision
If the heater is positioned closer to the transducer to reduce protrusion distance, then the data reading accuracy is improved, but the heat-induced damage to the transducer increases
Solution Approach 1:
The high thermal conductivity dielectric layer serves as a thermal management intermediary that allows the heater to be positioned close to the transducer for improved data reading accuracy, while the layer itself protects the transducer from heat-induced damage by controlling heat distribution.
Solution Approach 2:
The dielectric layer's high thermal conductivity parameter (at least 20 W/m-K) is specifically selected to optimize heat transfer characteristics, enabling efficient heat conduction away from the transducer while maintaining the heater's proximity for accurate data reading.
3Object-affected harmful factors
If a traditional low thermal conductivity dielectric layer is used to insulate the transducer, then the transducer is protected from heat, but the protrusion efficiency decreases due to insufficient heat transfer
Solution Approach 1:
The dielectric layer's thermal conductivity parameter is changed from traditional low values to at least 20 W/m-K, transforming it from a heat insulator into a heat conductor that efficiently transfers heat for protrusion while still providing thermal management protection to the transducer.
Solution Approach 2:
The dielectric layer exhibits different functional qualities in different contexts: it efficiently conducts heat in the direction needed for thermal expansion while simultaneously providing thermal protection to the transducer, achieving both heat transfer and heat protection functions through its high thermal conductivity property.
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 configuration enhances the heat-induced protrusion efficiency, allowing for precise control of the transducer position, improved data reading accuracy, and reduced power consumption while maintaining the protrusion stroke.
Implementation Method 1
a continuous dielectric layer comprising a dielectric material having a coefficient of thermal conductivity of at least 20 W/m-K, the dielectric layer positioned adjacent to and in contact with the heater and between the heater and the transducer
Implementation Method 2
heating a portion of the slider to produce a heat-induced protrusion proximate the read sensor
Data Source
AI summary
A slider having a slider body having an air bearing surface, a leading edge and a trailing edge, and a transducer on the air bearing surface proximate the trailing edge, the transducer comprising a read sensor and a write sensor. The slider also has a heater, positioned proximate the transducer, and a continuous dielectric layer comprising a dielectric material having a coefficient of thermal conductivity of at least 20 W/m-K, the dielectric layer positioned adjacent to and in contact with the heater and between the heater and the transducer.