Spring-Loaded Heat Sink Fixing Unit for Even Bare Die Contact
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Solution Overview
Problem
Conventional methods of fixing heat dissipation devices to bare dies result in uneven and asynchronous force distribution, leading to potential damage and thermal resistance, as well as incomplete contact, which can cause warping or breakage of the fragile bare die.
Innovation Solution
A fixing unit comprising a spring loaded screw, screw sleeve, spring retainer, and release member that applies synchronous and even downward forces by releasing the spring from its compressed state simultaneously across multiple points, ensuring stable and complete contact with the bare die.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If screw units are sequentially tightened at high speed to reduce fixing time, then productivity is improved, but the bare die is damaged due to uneven and asynchronous force distribution
Solution Approach 1:
Multiple screw units are merged into a synchronized system through the base structure, where tightening one screw unit simultaneously tightens all other screw units. This combines individual tightening actions into a unified synchronous operation, achieving both high productivity and even force distribution to prevent bare die damage.
Solution Approach 2:
The base is segmented into multiple regions with corresponding screw units distributed across different locations. This segmentation allows the system to apply force at multiple points simultaneously, distributing the tightening load evenly across the bare die while maintaining high-speed operation.
2Productivity
If downward forces are applied asynchronously to fix the heat dissipation device, then the fixing operation is completed quickly, but thermal resistance increases due to incomplete contact
Solution Approach 1:
The screw units are merged into a synchronized system through the base, ensuring that all downward forces are applied simultaneously and uniformly. This merging of tightening actions guarantees complete and uniform contact between the heat dissipation device and the bare die, eliminating thermal resistance while maintaining high fixing speed.
3Productivity
If the heat dissipation device is tightened unevenly, then the fixing process is faster, but the bare die warps or breaks due to uneven pressure distribution
Solution Approach 1:
The base is segmented into multiple symmetric regions with screw units distributed evenly across these regions. This segmentation ensures that tightening forces are distributed uniformly across the entire bare die surface, preventing warping or breaking while maintaining high fixing efficiency through simultaneous multi-point tightening.
Solution Approach 2:
The base structure employs symmetric arrangement of screw units at corresponding locations, creating a balanced force distribution system. This symmetric design counteracts any asymmetric tightening forces, ensuring the bare die remains flat and stable during the high-speed fixing process.
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
Prevents damage to the bare die by ensuring even force distribution and complete contact, reducing thermal resistance and maintaining effective heat exchange.
Implementation Method 1
a spring (12) fitted on around the spring loaded screw (11)... The spring (12) has a top end (121) and a bottom end (122). The bottom end (122) of the spring (12) is pressed against the retaining ring (16)... the spring (12) is released from the compressed state
Data Source
AI summary
Fixing units for connecting a heat dissipation device to a heat source are pre-mounted to four points on the former and respectively include a spring loaded screw having a spring fitted thereon and stopped by a retaining ring from moving down out of the spring loaded screw; a screw sleeve having the spring loaded screw received therein and being provided at an upper open end with two diametrically opposite notches; and a spring retainer fitted around the upper open end of the screw sleeve and having a pair of upward retaining plates, which are extended through the notches to abut on and compress the spring. To connect the heat dissipation device to the heat source, simply apply an external force or use a tool to release the retaining plates from the springs, and the released springs synchronously provide even forces to push the heat dissipation device against the heat source.