3D Stacked Circuit Board Assembly with Wall Structure for Handheld Devices
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Solution Overview
Problem
Modern handheld electronic devices face challenges in integrating complex subsystems into a compact and reliable form that can withstand daily use, requiring innovative solutions for housing, circuit board assembly, and antenna configurations to enhance functionality and durability.
Innovation Solution
A portable electronic device design featuring a circuit board assembly with a processor and memory module, millimeter-wave antenna arrays, and a flexible circuit element, along with a housing structure that includes conductive vias and solder barriers to secure components and limit adhesive spread, ensuring structural integrity and efficient wireless communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple subsystems (cameras, display, wireless communications) are integrated into a smartphone, then functionality is improved, but device complexity increases
Solution Approach 1:
The circuit board assembly is segmented into multiple layers (first circuit board, second circuit board) with specialized functions. The first circuit board houses the processor and memory, while the second circuit board accommodates camera subsystems and other components. This segmentation allows complex functionality to be distributed across manageable modules, reducing overall device complexity while maintaining versatility.
Solution Approach 2:
The patent implements a nested structure where the second circuit board is positioned above and coupled to the first circuit board through a wall structure. The processor is embedded within an internal volume defined between the two circuit boards, creating a nested arrangement that maximizes space utilization. This nesting approach enables multiple subsystems to coexist in a compact configuration, improving functionality without proportionally increasing device volume.
2Volume of moving object
If a compact form factor is used, then portability is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent transitions from a two-dimensional circuit board layout to a three-dimensional stacked configuration. The second circuit board is positioned above the first circuit board at a distance, creating vertical separation that allows for complex interconnections without increasing the horizontal footprint. This dimensional change enables compact form factor while providing sufficient space for precise component placement and soldering operations.
Solution Approach 2:
A wall structure acts as an intermediary element between the first and second circuit boards. This wall structure provides mechanical support, defines the internal volume for the processor, and facilitates precise alignment and coupling between the two circuit boards. The intermediary structure simplifies the manufacturing process by providing reference surfaces and structural guidance, thereby reducing the overall manufacturing precision requirements despite the compact three-dimensional arrangement.
3Ease of manufacture
If adhesive is used to bond circuit boards, then assembly ease is improved, but adhesive spread control becomes difficult
Solution Approach 1:
The wall structure is provided with localized adhesive application features, such as adhesive barriers or defined adhesive recesses, that confine the adhesive to specific areas where bonding is required. This local quality approach ensures that adhesive is applied precisely where needed between the circuit boards and wall structure, preventing unwanted spread while maintaining ease of assembly through adhesive bonding.
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
The solution provides a robust and functional handheld device with enhanced durability and wireless communication capabilities, enabling a wide range of functionalities while maintaining a compact and reliable form factor.
Implementation Method 1
An adhesive is positioned between the wall structure and the first circuit board and between the wall structure and the second circuit board. The adhesive bonds the first circuit board and the second circuit board to the wall structure.
Implementation Method 2
The wall structure comprises a via and the first circuit board is soldered to the via. The second circuit board may be soldered to the via, thereby conductively coupling the first circuit board to the second circuit board.
Implementation Method 3
The second circuit board may be soldered to the via, thereby conductively coupling the first circuit board to the second circuit board.
Implementation Method 4
The portable electronic device may also include a millimeter-wave antenna array coupled to the bottom surface of the first circuit board.
Data Source
AI summary
A portable electronic device includes a housing defining an internal volume and a circuit board assembly within the internal volume. The circuit board assembly includes a first circuit board, a wall structure soldered to the first circuit board, and a second circuit board soldered to the wall structure and supported above the first circuit board by the wall structure. The second circuit board defines an exterior top surface of the circuit board assembly. A processor is coupled to the first circuit board and positioned within an internal volume defined between the first circuit board and the second circuit board and at least partially surrounded by the wall structure. A memory module is coupled to the exterior top surface of the circuit board assembly.