Flexible PCB Assembly With Strip Slots for Foldable Hinges

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Solution Overview

Problem

The increasing width of flexible printed circuit boards (FPCs) in foldable electronic products due to enhanced functionality leads to distortion during folding, reducing their service life.

Innovation Solution

Incorporating strip-shaped holes in the FPC to separate it into multiple transmission segments with small widths, ensuring the FPC is not significantly twisted during bending, thereby prolonging its service life.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Quantity of substance

If the FPC width is increased to accommodate more signals, then the signal transmission capability is improved, but the distortion risk during folding increases

Engineering Contradiction:

Improvesignal transmission capabilityVSAvoiddistortion risk

Core Design Contradiction:

Quantity of substanceVSReliability

Solution Approach 1:

The FPC is divided into multiple transmission segments by introducing strip-shaped holes, reducing the width of each segment while maintaining overall signal transmission capability through multiple segments working together

Inventive Principle:

Principle #1Segmentation

2Quantity of substance

If the FPC width is increased to accommodate more signals, then the signal transmission capability is improved, but the service life is reduced

Engineering Contradiction:

Improvesignal transmission capabilityVSAvoidservice life

Core Design Contradiction:

Quantity of substanceVSDuration of action of stationary object

Solution Approach 1:

Inventive Principle:

Principle #1Segmentation

3Adaptability or versatility

If the FPC is folded repeatedly, then the device functionality is maintained, but the twist accumulation increases

Engineering Contradiction:

Improvedevice functionalityVSAvoidtwist accumulation

Core Design Contradiction:

Adaptability or versatilityVSStability of the object's composition

Solution Approach 1:

The FPC is divided into multiple transmission segments by introducing strip-shaped holes, allowing each segment to independently accommodate folding movements while reducing overall twist accumulation

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The strip-shaped holes enable dynamic adjustment of each transmission segment during folding, allowing the segments to move independently and maintain stability through controlled deformation

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS20260067384A1Electronic device and circuit connection assembly

Publication Date: 2026.03.05 HUAWEI TECH CO LTD

AI summary

An electronic device includes a first fastening part, a rotating part, a second fastening part, and at least one layer of flexible printed circuit board. The second fastening part and the first fastening part are respectively located on two sides of the rotating part in a first direction. Two ends of the flexible printed circuit board in the first direction are respectively connected to the first fastening part and the second fastening part. At least some portions that are on the flexible printed circuit board and that are located between the first fastening part and the second fastening part are connected to the rotating part. The flexible printed circuit board is provided with at least one strip-shaped hole, the strip-shaped hole extends in the first direction, and at least a portion of the strip-shaped hole is located between the first fastening part and the second fastening part.