Headband Structure with Rolling Positioning Ball
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Solution Overview
Problem
The existing headband structures of headphones suffer from short service life due to friction issues in telescopic adjustment modules, leading to decreased accuracy in sizing adjustments as the elastic sheets wear out.
Innovation Solution
A headband structure incorporating a steel belt with positioning slots and a telescopic adjustment module featuring a fixing base, elastic sheet with an accommodating groove, and positioning balls, which maintains contact between the positioning balls and the steel belt to reduce friction and ensure accurate sizing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If an elastic sheet is used to snap into groove structures for telescopic adjustment, then the headband can be adjusted to different sizes, but the elastic sheet generates friction during sliding which causes wear and reduces service life
Solution Approach 1:
The patent introduces a positioning ball as an intermediary element between the elastic sheet and the steel belt. The positioning ball rolls within the positioning slot during adjustment, converting sliding friction into rolling friction. This mediator reduces wear on the elastic sheet while maintaining the telescopic adjustment function, thereby extending service life.
Solution Approach 2:
The patent replaces the traditional sliding friction mechanism with a rolling contact mechanism. By introducing the positioning ball that rolls along the positioning slot, the system substitutes pure sliding motion with rolling motion, significantly reducing friction and wear on the elastic sheet components.
2Adaptability or versatility
If the elastic sheet is worn, then the stretching force of the telescopic adjustment module decreases, but this causes the headband to be increasingly difficult to be accurately positioned to a specific size
Solution Approach 1:
The positioning ball acts as a mediator that maintains reliable contact between the elastic sheet and steel belt during adjustment. By rolling rather than sliding, it preserves the stretching force of the elastic sheet over time, ensuring consistent positioning accuracy even after extended use.
Solution Approach 2:
The patent changes the contact mode parameter from sliding friction to rolling friction. This parameter change reduces the coefficient of friction and wear, maintaining the elastic sheet's stretching force and positioning accuracy over the product's service life.
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 design enhances the service life of the headband structure by minimizing friction and maintaining accurate positioning, utilizing a wear-resistant steel belt and point contact between the positioning ball and steel belt for improved durability and precision.
Implementation Method 1
The elastic sheet constantly pushes the positioning balls to keep the positioning balls in contact with the steel belt
Implementation Method 2
The positioning ball is located between the steel belt and the elastic sheet... improving the service life by reducing friction
Data Source
AI summary
A headband structure of a headphone, including a headband assembly and a telescopic adjustment module, is provided. The headband assembly has a steel belt. The steel belt has multiple positioning slots. The telescopic adjustment module includes a fixing base, an elastic sheet, and a positioning ball. The fixing base is slidably disposed to the steel belt. The elastic sheet is disposed to the fixing base, and the elastic sheet has an accommodating groove. The positioning ball is disposed in the accommodating groove, and the positioning ball is located between the steel belt and the elastic sheet. The elastic sheet constantly pushes the positioning ball to keep the positioning ball in contact with the steel belt, and the positioning slots are located on moving paths of the positioning ball.