Damper Assembly for Bone Conduction Transducer Shock Management

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Solution Overview

Problem

Existing bone conduction devices face challenges in effectively managing impact and resonance, leading to potential damage from shock or sudden deceleration, which can result in failure of the piezoelectric material and counterweight assembly.

Innovation Solution

Incorporation of a damper assembly that fills the gap between the housing and the transducer-seismic mass assembly, comprising elastic and isolation layers to absorb impulse forces and prevent rapid acceleration/deceleration, while also providing varying degrees of damping, including effectively no damping at non-resonant frequencies.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If a rigid structure is used to support the transducer, then structural strength is improved, but shock resistance deteriorates

Engineering Contradiction:

Improvestructural strengthVSAvoidshock damage

Core Design Contradiction:

StrengthVSObject-affected harmful factors

Solution Approach 1:

A shock-absorbing element is pre-installed between the transducer assembly and housing to cushion against shock forces before they reach the piezoelectric material. This element compresses during impact events, absorbing the shock energy and preventing damage to the transducer components.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

Solution Approach 2:

The shock-absorbing element acts as an intermediary component between the rigid transducer assembly and the housing, mediating the transmission of shock forces. It allows the rigid structural support to maintain strength while intercepting and attenuating harmful shock forces before they reach the piezoelectric material.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Object-affected harmful factors

If damping material is placed between the transducer and housing, then shock resistance is improved, but resonance control deteriorates

Engineering Contradiction:

Improveshock resistanceVSAvoidresonance control

Core Design Contradiction:

Object-affected harmful factorsVSReliability

Solution Approach 1:

The shock-absorbing element is positioned locally at the interface between the transducer assembly and housing, providing shock protection only where impact forces are most likely to occur. This localized approach allows other parts of the transducer to maintain their resonance characteristics without being compromised by excessive damping material.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The shock-absorbing element is designed with specific dimensional characteristics that provide sufficient shock absorption for typical impact events while maintaining transparency to resonant vibrations during normal operation. The element's stiffness and damping properties are optimized to be partially effective against shocks but minimally interfering with resonance control.

Inventive Principle:

Principle #16Partial or excessive action

3Stability of the object's composition

If the transducer is firmly mounted in the housing, then structural stability is improved, but impact resistance deteriorates

Engineering Contradiction:

Improvestructural stabilityVSAvoidimpact damage

Core Design Contradiction:

Stability of the object's compositionVSObject-affected harmful factors

Solution Approach 1:

The shock-absorbing element is pre-positioned in the mounting structure to provide cushioning before impact forces are transmitted to the transducer. This allows the transducer to be firmly mounted for stability while the cushioning element intercepts impact forces that would otherwise compromise the mounting structure.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

Solution Approach 2:

The mounting structure incorporates a dynamic shock-absorbing element that changes its mechanical properties based on the applied load. During normal operation, the element maintains a rigid connection for structural stability, but during impact events, it compresses and dissipates energy, providing impact resistance.

Inventive Principle:

Principle #15Dynamics

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

The solution effectively absorbs impulse forces, reduces the risk of damage to the piezoelectric material, and maintains the transducer's functionality across a range of frequencies and shock levels, ensuring reliable operation and extended lifespan.

Implementation Method 1

comprising elastic and isolation layers to absorb impulse forces and prevent rapid acceleration/deceleration

Methodology Applied

Scientific EffectElasticity: Elasticity

Implementation Method 2

providing varying degrees of damping, including effectively no damping at non-resonant frequencies

Methodology Applied

Scientific EffectDamping: Damping

Data Source

PatentUS20250024208A1Impact and resonance management

Publication Date: 2025.01.16 COCHLEAR LIMITED

AI summary

A vibrator including a housing, a transducer positioned within the housing such that there is a gap between the transducer and housing, and a damper assembly, disposed in the gap between the housing and at least a portion of the transducer, the damper assembly extending a sub-distance of the total distance of the gap.