Bone Conduction Headphone Speaker Assembly for Lead Wire Stability

Solution Overview

Problem

The structure of bone conduction speakers in headphones is unstable during vibration, leading to potential damage and reduced service life due to excessive stretching of lead wires.

Innovation Solution

The design includes a first vibration transmitting plate with a specific angle arrangement between its lead portions and axis directions, along with rotating shaft mechanisms and hollow areas for lead wire protection, to reduce tensile stress and enhance structural stability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the lead wire is connected directly between the inner ring fixing portion and outer ring fixing portion, then the electrical connection is simple, but the lead wire is excessively stretched during transducer vibration causing structural instability

Engineering Contradiction:

Improvestructural stabilityVSAvoidlead wire arrangement complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The lead wire is routed along the long axis direction of the first vibration transmitting plate rather than directly connecting the inner and outer ring fixing portions. This dimensional change in wire routing reduces tensile stress during transducer vibration by utilizing the longer path length in the long axis direction, thereby improving structural stability without excessive complexity

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Solution Approach 2:

The lead wire is pre-positioned and fixed along the long axis direction before the transducer vibration occurs. This preliminary arrangement ensures that the lead wire follows the optimal path that minimizes stretching during operation, preventing excessive tension before it can cause damage

Inventive Principle:

Principle #10Preliminary action

2Reliability

If the first lead portion is arranged along the long axis direction, then the tensile stress during vibration is reduced, but the lead wire path becomes longer increasing complexity

Engineering Contradiction:

Improvelead wire stabilityVSAvoidlead wire length

Core Design Contradiction:

ReliabilityVSLength of moving object

Solution Approach 1:

The arrangement changes the orientation parameter of the lead wire from a direct radial connection to alignment with the long axis direction of the vibration transmitting plate. This parameter change optimizes the lead wire's resistance to tensile stress during vibration, improving reliability despite the increased length

Inventive Principle:

Principle #35Parameter changes

3Reliability

If the transducer is suspended in the core housing without vibration isolation, then the assembly is compact, but the lead wire is excessively stretched during vibration reducing service life

Engineering Contradiction:

Improveservice lifeVSAvoidcore housing volume

Core Design Contradiction:

ReliabilityVSVolume of stationary object

Solution Approach 1:

The lead wire is routed along the long axis direction of the first vibration transmitting plate rather than directly connecting the inner and outer ring fixing portions. This dimensional change in wire routing reduces tensile stress during transducer vibration by utilizing the longer path length in the long axis direction, thereby improving structural stability without excessive complexity

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Solution Approach 2:

The lead wire is pre-positioned and fixed along the long axis direction before the transducer vibration occurs. This preliminary arrangement ensures that the lead wire follows the optimal path that minimizes stretching during operation, preventing excessive tension before it can cause damage

Inventive Principle:

Principle #10Preliminary action

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 configuration effectively reduces the likelihood of lead wire stretching during vibration, improving the structural stability and reliability of the speaker assembly, thereby extending its service life.

Implementation Method 1

The at least two elastic connecting portions are connected between the inner ring fixing portion and the outer ring fixing portion

Methodology Applied

Scientific EffectElastic deformation: Elasticity

Data Source

PatentUS20260006360A1headphones

Publication Date: 2026.01.01 SHENZHEN SHOKZ CO LTD

AI summary

The present disclosure discloses a headphone, and the headphone comprises a speaker assembly and a wearing assembly. The speaker assembly includes a bone conduction speaker. The bone conduction speaker includes a core housing, a first vibration transmitting plate, a transducer, a vibration plate, and a lead wire. The first vibration transmitting plate includes an inner ring fixing portion, an outer ring fixing portion, and at least two elastic connecting portions. The at least two elastic connecting portions are connected between the inner ring fixing portion and the outer ring fixing portion, the inner ring fixing portion is connected to the transducer, the outer ring fixing portion is connected to the core housing, so that the transducer is suspended in the core housing, and the vibration plate is connected to the transducer. The lead wire is connected to the transducer and includes a first lead portion extending from the inner ring fixing portion to the outer ring fixing portion. A dimension of the first vibration transmitting plate along a long axis direction is larger than a dimension of the first vibration transmitting plate along a short axis direction, and an angle between the first lead portion and the long axis direction is less than an angle between the first lead portion and the short axis direction. In this way, the structural stability of the speaker assembly can be enhanced.