Disk Device Thermal Management via Composite Radiation Sheet
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Solution Overview
Problem
Existing disk devices face challenges in improving heat radiation efficiency without damaging electronic components due to the limitations of radiation sheet hardness and compression pressure, which can lead to reduced contact area and degraded performance.
Innovation Solution
The design incorporates a radiation sheet with a softer material and a specific area ratio between the contact surfaces, allowing for increased compression without exceeding the pressure resistance limits of electronic components, thereby enhancing heat radiation efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a radiation sheet with high radiation performance is used, then heat radiation efficiency is improved, but the radiation sheet becomes harder and exceeds the pressure resistance limit of the LSI when compressed
Solution Approach 1:
The patent uses a composite structure consisting of a radiation sheet and a cushioning member (foam material) working together. The radiation sheet provides high heat radiation performance while the cushioning member provides softness and compliance. This composite approach allows achieving both high heat radiation efficiency and protection of the LSI from excessive compression pressure.
Solution Approach 2:
The cushioning member acts as an intermediary between the radiation sheet and the LSI. It mediates the compression force, allowing the radiation sheet to maintain good thermal contact with the LSI while preventing excessive pressure that would damage the LSI's soldered portions.
2Temperature
If the amount of compression is increased to improve heat radiation efficiency, then contact pressure is improved, but the limit of pressure resistance of the LSI is exceeded
Solution Approach 1:
The patent changes the physical parameters of the thermal management system by introducing a cushioning member with specific mechanical properties (softness, compression resistance). This allows optimizing the compression amount to a specific range that achieves good thermal contact without exceeding the LSI's pressure resistance limit, thus preventing damage to soldered portions.
Solution Approach 2:
The cushioning member is placed beforehand between the radiation sheet and the LSI to prevent excessive compression. It provides pre-compression and cushioning effects that protect the LSI from damage while ensuring adequate contact pressure for heat radiation.
3Area of stationary object
If the radiation sheet is made softer to increase compression amount, then contact area is improved, but heat radiation performance is degraded
Solution Approach 1:
The patent employs a composite system where the radiation sheet (with high radiation performance but potentially smaller contact area) works in conjunction with a cushioning member (foam material) that ensures adequate contact area. The cushioning member compensates for the radiation sheet's limited compliance, allowing the radiation sheet to maintain its high performance characteristics while achieving sufficient contact area through the cushioning effect.
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 effectively increases heat radiation efficiency while preventing damage to electronic components by optimizing the contact pressure and adhesion between the radiation sheet and the components, allowing for improved cooling without exceeding the pressure resistance limits.
Implementation Method 1
The heat of the LSI is released to the housing via the radiation sheet
Data Source
AI summary
According to one embodiment, a disk device includes a housing including a bottom wall including a protrusion with a first surface, a recording medium arranged in the housing, a printed circuit board attached to the bottom wall, an electronic component mounted on the printed circuit board and including a second surface facing the first surface, and a radiation sheet including a third surface which is contact with the first surface, and a fourth surface which is in contact with the second surface. An area of the first surface is less than an area of the third surface of the radiation sheet, or an area of the second surface is less than an area of the fourth surface of the radiation sheet.