Meandering Flexible Circuit Board in Segmented Band Device
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Solution Overview
Problem
Conventional wristwatches face challenges in integrating electronic devices due to size limitations, metal casing interference, and waterproofing, which hinders the implementation of advanced functionalities like smartwatch features.
Innovation Solution
A band-type electronic device with a flexible circuit board arranged in a meandering shape within segments of a metal band, incorporating waterproofing and electromagnetic interference mitigation to enable seamless communication and functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional wristwatch structure is used, then the device maintains traditional watch design and simplicity, but it cannot accommodate advanced electronic components and smartwatch functionalities
Solution Approach 1:
The band-type electronic device is divided into multiple segments that can be connected in various configurations. Each segment can independently house electronic components, allowing the device to accommodate smartwatch functionalities while maintaining a traditional watch band structure. The segments are modular and can be arranged to fit different wrist sizes and designs.
Solution Approach 2:
Electronic components are nested within the band segments, with the flexible circuit board and components integrated into the hollow portions of the segments. This nesting approach allows advanced electronics to be concealed within the traditional-looking band structure, achieving both adaptability and aesthetic simplicity.
2Reliability
If a rigid circuit board is used in a metal band, then structural support is provided, but electromagnetic interference occurs and waterproofing is compromised
Solution Approach 1:
A flexible circuit board is used instead of a rigid one, allowing the circuit to conform to the curved surfaces within the band segments. The flexible nature of the circuit board reduces electromagnetic interference by distributing signals over a larger area and avoiding sharp corners that act as antennas. Additionally, the flexible board can be sealed more effectively for waterproofing.
Solution Approach 2:
The flexible circuit board is deformed into a meandering shape that follows the curved contours within the band segments. This curved configuration reduces electromagnetic interference by avoiding straight-line signal paths that are more susceptible to interference, and the meandering shape provides natural strain relief and flexibility.
3Ease of manufacture
If the flexible circuit board is arranged in a straight line, then manufacturing is simplified, but the board is vulnerable to damage during bending and deformation
Solution Approach 1:
The flexible circuit board is arranged in a meandering shape rather than a straight line. This curved configuration distributes mechanical stress along the length of the board during bending and deformation, preventing concentration of stress at any single point. The meandering shape naturally accommodates the curvature required when the band is worn on the wrist.
Solution Approach 2:
The meandering shape of the flexible circuit board provides built-in strain relief and stress distribution before any actual bending occurs. The curved paths and loops in the meandering design act as cushioning elements that absorb mechanical stress, protecting the circuit traces and connections from damage during normal wear and handling.
4Adaptability or versatility
If electronic components are integrated into the band segments, then smartwatch features are enabled, but the device becomes more complex to assemble and waterproof
Solution Approach 1:
The device is segmented into modular units, each containing specific electronic components mounted on the flexible circuit board. These segments can be independently assembled and tested before being connected to form the complete device. This modular approach simplifies manufacturing by allowing parallel assembly of multiple segments and easier replacement or upgrading of individual components.
Solution Approach 2:
Multiple functional elements are merged into the band segments, with the flexible circuit board serving as both the structural support and the electrical interconnection medium. Electronic components are directly mounted on the flexible board, eliminating the need for separate rigid PCBs and reducing the number of assembly steps. The band structure itself provides mechanical support and housing, combining structural and electronic functions.
Data Source
AI summary
A band-type electronic device and a method for configuration of a flexible circuit board in a band-type electronic device are disclosed. The band-type electronic device includes a plurality of segments connected with each other in a band-like shape, a plurality of electronic components arranged in the plurality of segments, and a flexible circuit board connected to the plurality of electronic components arranged in the plurality of segments, wherein the flexible circuit board is partly deformed into a meandering shape in at least one of the plurality of segments.