Flexible Cable Impedance Matching With Adjustable Blind Blades
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Solution Overview
Problem
Flexible cables used in electronic devices face challenges in achieving the required characteristic impedance values for efficient signal transmission, especially when connecting to printed circuit boards with different impedance characteristics.
Innovation Solution
A cable impedance matching element is introduced, which includes a blind frame and rotatable blind blades that can adjust their tilting angle to match the impedance of the flexible cable to that of the printed circuit board, without disturbing the arrangement of metal layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If flexible cables are used without impedance matching structures, then manufacturing cost is reduced and flexibility is maintained, but characteristic impedance cannot be controlled to match printed circuit boards
Solution Approach 1:
The patent changes the permittivity parameter of the cable by introducing air gaps between the cable and the impedance matching element. By adjusting the height of the impedance matching element, the air gap volume changes, which directly modifies the effective permittivity of the cable structure, enabling impedance control without complex internal cable redesign
Solution Approach 2:
The impedance matching element acts as an intermediary component between the flexible cable and the printed circuit board. This separate element provides impedance matching functionality without requiring modifications to the cable's internal structure, maintaining cable flexibility while achieving the desired characteristic impedance
2Ease of manufacture
If impedance matching elements are fixed using tape or adhesive, then positioning is simplified, but unintended impedance changes occur due to the fixing method itself
Solution Approach 1:
The patent extracts the impedance matching function from the cable assembly process by using a press-fitting structure that relies on mechanical interference rather than adhesive bonding. The impedance matching element is inserted into a dedicated space within the cable connector, eliminating the need for tape or adhesive and avoiding the impedance disruptions caused by these materials
Solution Approach 2:
Instead of fixing the impedance matching element to the cable exterior using adhesive, the patent inverts the approach by designing an internal press-fitting structure where the element is mechanically retained within the cable connector housing, achieving both secure positioning and impedance integrity
3Adaptability or versatility
If blind blades are made fixed rather than rotatable, then structure is simplified, but adaptability to different capacitance requirements is lost
Solution Approach 1:
The patent implements rotatable blind blades that can dynamically adjust their tilting angles to different positions. This dynamic capability allows the same cable structure to achieve different capacitance values by rotating the blades to various angles, providing adaptability without requiring multiple fixed cable designs
Solution Approach 2:
The rotatable blind blade mechanism serves multiple functions: it can be rotated to different angles to achieve different capacitance values for impedance matching, and it can also be positioned to completely block air passages when maximum capacitance is required. This single mechanism handles both impedance matching and capacitance adjustment needs
4Manufacturing precision
If air passages are completely blocked to increase capacitance, then impedance matching range is improved, but signal transmission path is obstructed
Solution Approach 1:
The patent applies partial action by allowing selective blocking of air passages rather than complete blocking. The blind blades can be rotated to partially obstruct air passages to achieve the required capacitance increase for impedance matching, while leaving sufficient passage open to maintain signal transmission speed and avoid complete obstruction
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 solution enables accurate impedance matching, maintaining communication quality and preventing signal distortions by adjusting the permittivity of the flexible cable through controlled tilting of the blind blades, thus minimizing unintended impedance changes.
Implementation Method 1
adjusting the permittivity of the flexible cable through controlled tilting of the blind blades, thus minimizing unintended impedance changes
Data Source
AI summary
Embodiments of the disclosure relate to a cable impedance matching element provided in a flexible cable and, more specifically, may be coupled to an FC and have a blind frame supporting an FC impedance matching element and a plurality of blind blades coupled to at least one side and another side of an edge of the blind frame and may open/close an air layer by tilting of the blind blades.