Speaker Unit Vibration Isolation and Sound Sealing

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Solution Overview

Problem

In systems like hands-free car calls, loudspeakers attached to the car's interior generate vibrations that cause noise due to direct attachment, leading to interior noise and potential echo-cancellation degradation.

Innovation Solution

A sound output device design featuring a speaker unit with a separating member and a sealing member to absorb vibrations and reduce noise transmission, where the separating member is placed between the speaker unit and the attaching member, and the sealing member is used to minimize sound emission from the opposite side of the speaker unit.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If the speaker unit is directly attached to the car's interior, then the sound output is improved, but vibrations are transmitted to the interior causing noise

Engineering Contradiction:

Improvenoise from vibrationsVSAvoidsound output quality

Core Design Contradiction:

Object-affected harmful factorsVSReliability

Solution Approach 1:

A separating member is introduced between the speaker unit and the attaching member to act as a vibration-absorbing intermediary. This mediator reduces the transmission of vibrations to the car interior while maintaining the structural connection, thus resolving the contradiction between sound output quality and vibration-induced noise.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The separating member changes the mechanical parameters of the connection system by introducing materials with different vibration transmission characteristics. This parameter change allows the system to maintain acoustic coupling while reducing mechanical vibration transmission to the interior.

Inventive Principle:

Principle #35Parameter changes

2Ease of manufacture

If the speaker unit is directly attached to the car's interior, then the installation is simplified, but vibrations generated by the loudspeaker vibrate the interior resulting in noise

Engineering Contradiction:

Improveinstallation simplicityVSAvoidinterior vibration noise

Core Design Contradiction:

Ease of manufactureVSObject-affected harmful factors

Solution Approach 1:

The separating member serves as a vibration-absorbing intermediary that is easily integrated into the attachment structure. This intermediary component reduces vibration transmission to the car interior while maintaining straightforward installation procedures, thus resolving the contradiction between installation simplicity and vibration-induced noise.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Reliability

If sound is emitted from the rear side of the speaker unit, then sound transmission efficiency is improved, but sound sneaking to the sound emitting portion side causes interference

Engineering Contradiction:

Improvesound transmission efficiencyVSAvoidsound interference

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The harmful rearward sound emission is extracted and isolated from the main sound path using a sealing member. This extraction prevents the rearward sound from sneaking back to the sound emitting portion, thus resolving the contradiction between sound transmission efficiency and sound interference.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

A sealing member is introduced as an intermediary between the rear side of the speaker unit and the sound emitting portion side. This mediator blocks the transmission of rearward sound waves that would otherwise cause interference, while maintaining the overall sound transmission efficiency through the speaker unit.

Inventive Principle:

Principle #24Intermediary (Mediator)

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

Effectively reduces vibrations and noise transmitted to the car's interior, improving echo-cancellation performance by absorbing vibrations and minimizing sound sneaking from the rear portion of the speaker unit to the sound emitting portion.

Implementation Method 1

a separating member that is provided between the speaker unit and the attaching member to separate the speaker unit from the attaching member... The separating member reduces a sound that is emitted from a side of the speaker unit opposite to the sound emitting portion and is transmitted to a sound emitting portion side

Methodology Applied

Scientific EffectVibration absorption: Damping

Implementation Method 2

a sealing member that is provided between the speaker unit and the attaching member to reduce a sound that is emitted from a side of the speaker unit opposite to the sound emitting portion and is transmitted to a sound emitting portion side

Methodology Applied

Scientific EffectSound transmission reduction: Acoustic Absorption

Data Source

PatentUS11375304B2Sound output device

Publication Date: 2022.06.28 YAMAHA CORP

AI summary

A sound output device includes: a speaker unit that has a sound emitting portion; an attaching member by which the speaker unit is attached to an object; a separating member that is provided between the speaker unit and the attaching member to separate the speaker unit from the attaching member; and a sealing member that is provided between the speaker unit and the attaching member to reduce a sound that is emitted from a side of the speaker unit opposite to the sound emitting portion and is transmitted to a sound emitting portion side. The attaching member has a first portion on a side of the sound emitting portion of the speaker unit, and the first portion of the attaching member has an opening that corresponds to the sound emitting portion.