Electronic Component Joining via Offset Pad Alignment
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Solution Overview
Problem
Existing electronic component manufacturing methods fail to achieve connections with lower resistance than standard flip-chip manufacturing, often resulting in increased electrical resistance due to voids formed during the joining process, especially when pads are recessed and flux is used.
Innovation Solution
A method involving a manufacturing apparatus that positions components with initially offset pads, melts the metal member between them, and then moves the components relative to each other in the X-Y plane to align and solidify the metal member, reducing void formation and achieving low resistance connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If standard flip-chip manufacturing is used, then the manufacturing process is simple, but the connection resistance is high due to void formation
Solution Approach 1:
The pads are positioned in advance with a predetermined offset distance before the metal member is melted. This preliminary positioning allows the metal member to be melted and then move to fill the recessed pad area, reducing void formation and connection resistance without requiring complex real-time adjustment mechanisms during the joining process.
Solution Approach 2:
The offset distance between the first pad and second pad is controlled within a specific range (0.01 mm to 0.06 mm) to optimize the flow of melted metal member into the recessed pad area. By carefully controlling this parameter, the method achieves low resistance connections while maintaining a relatively simple manufacturing process.
2Ease of manufacture
If pads are recessed and flux is used, then the joining process is easier, but void formation increases leading to higher resistance
Solution Approach 1:
The offset positioning of pads is established before the joining process begins. This preliminary arrangement ensures that when the metal member melts, it naturally flows into the recessed pad area to fill voids, maintaining ease of manufacture with recessed pads and flux while reducing connection resistance through the predetermined offset geometry.
Solution Approach 2:
The recessed pad structure, which normally causes void formation and high resistance, is converted into a benefit by introducing an offset distance. The offset allows melted metal to flow into the recessed area, transforming the harmful void-prone geometry into a beneficial self-filling structure that reduces resistance while maintaining manufacturing ease.
3Reliability
If pads are aligned precisely before joining, then void formation is reduced, but alignment precision requirements increase manufacturing difficulty
Solution Approach 1:
Instead of aligning pads precisely before joining (conventional approach), this invention inverts the approach by deliberately positioning pads with a predetermined offset. The offset distance (0.01 mm to 0.06 mm) is designed to allow melted metal to flow and fill voids during the joining process, achieving void suppression without requiring high alignment precision.
Solution Approach 2:
The pad positioning parameter is changed from precise alignment (zero offset) to a predetermined offset range (0.01 mm to 0.06 mm). This parameter change reduces the manufacturing precision requirement while still suppressing void formation, as the offset geometry guides the melted metal flow to fill recessed areas during joining.
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 suppresses void formation and achieves low resistance connections by aligning pads during the melting state, improving reliability and operational characteristics of electronic components.
Implementation Method 1
melting the metal member and moving the first component and the second component with respect to each other until the melted metal member contacts both the first pad and the second pad
Implementation Method 2
solidifying the metal member in a second state after moving at least one of the first component or the second component in the direction along the first surface
Data Source
AI summary
A method for manufacturing an electronic component includes positioning a first surface of a first component facing a second surface of a second component in a first state. The first surface has a first pad having a first center. The second surface has a second pad having a second center. At least one of the first or second pads includes a metal member. The method includes melting the metal member and moving the first and second components until the melted metal member contacts both pads, moving at least one of the first or second components in a direction along the first surface, and solidifying the metal member in a second state. A first distance in a direction along the first surface between the first and second centers in the first state is longer than a second distance in the direction between the first and second centers in the second state.