Circuit Device Shielding Wall Grease Containment
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Solution Overview
Problem
In circuit devices, heat dissipation grease can enter gaps between components during assembly, making it difficult to manage thickness and torque, leading to assembly process issues.
Innovation Solution
A circuit device configuration featuring a shielding wall and heat transfer material application region, where the heat transfer material is held by the shielding wall, preventing it from reaching the pedestal portion and causing assembly problems, and optionally using a groove to further prevent grease from entering the gap.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If heat dissipation grease is applied to the heat dissipation member surface, then heat transfer efficiency is improved, but the grease may enter gaps between components and make it difficult to manage assembly parameters
Solution Approach 1:
The base portion is divided into distinct functional regions: a heat transfer region where grease is applied, and a pedestal portion that remains grease-free. This segmentation prevents grease from contaminating the pedestal area while maintaining effective heat transfer at the interface with the circuit board.
Solution Approach 2:
The heat dissipation member exhibits local quality differentiation: the base portion has high thermal conductivity and grease-absorbing properties for efficient heat transfer, while the pedestal portion maintains a grease-free surface for precise assembly control and proper mechanical engagement with the circuit board.
2Strength
If screws are passed through the circuit board and screwed into the seat portion, then the circuit board is fixed to the heat dissipation member, but grease may enter screw holes and make torque management difficult
Solution Approach 1:
The fastening function is separated from the heat transfer function. The pedestal portion provides a dedicated grease-free zone for screw insertion and torque application, while the heat transfer grease is confined to the base portion interface with the circuit board, preventing contamination of screw holes.
3Reliability
If heat dissipation grease is spread between circuit board and heat dissipation member, then heat transfer is enhanced, but thickness management becomes difficult when grease reaches the seat portion
Solution Approach 1:
The base portion is segmented into a heat transfer region for grease application and a pedestal region that remains grease-free. This spatial segmentation ensures grease is confined to areas where thickness variation is acceptable for heat transfer, while preventing grease accumulation in the pedestal area where precise thickness control is critical for assembly.
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 effectively prevents heat transfer material from entering the gap between the pedestal and circuit board, ensuring proper assembly and torque management, thus avoiding assembly process issues.
Implementation Method 1
a heat transfer material interposed between the circuit board and the base portion
Data Source
AI summary
A circuit device 1 includes: a circuit assembly including a circuit board; a heat sink; and heat dissipation grease. The heat sink includes a main plate portion disposed to face the circuit board, and boss portions protruding from the main plate portion toward the circuit board and abutting the circuit board, and is a member fixed to the circuit board by screwing. The heat dissipation grease is a heat transfer material that is interposed between the circuit board and the main plate portion, and has fluidity. The main plate portion includes, on a heat transfer surface facing the circuit board, a first grease application region to which the heat dissipation grease is applied. The circuit board includes a shielding wall extending from a heat dissipation surface facing the main plate portion toward an intermediate region between the first boss portion and the first grease application region in the main plate portion.