Portable Speaker Casing Spacers for Stable Bass Response

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Solution Overview

Problem

Gaps between a speaker box and surrounding components in portable computing devices lead to reduced audio performance, particularly in the bass range, due to deformation of the device covers, causing perceivable issues like 'rub' and 'buzz'.

Innovation Solution

Incorporating pre-compressed elastic spacers between cover parts of the device casing to maintain speaker volume under external compressing forces, ensuring sufficient size and improving audio performance by counteracting compression with elastic recoil forces.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the gaps between speaker box and surrounding components are reduced to minimize device deformation effects, then audio performance deteriorates due to rub and buzz, but increasing gaps improves audio performance while increasing sensitivity to deformation

Engineering Contradiction:

Improveaudio performanceVSAvoidrub and buzz effects

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent applies preliminary action by pre-compressing elastic spacers before assembly. These pre-compressed spacers are positioned between cover parts to proactively counteract compression forces that will occur during device use, thereby maintaining speaker volume and preventing gaps from closing before deformation actually occurs

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent implements beforehand cushioning by introducing elastic spacers that are pre-compressed to provide cushioning force. These spacers are positioned in advance to absorb and counteract compression forces on the speaker box, preventing the harmful closing of gaps and the resulting rub and buzz effects before they can occur

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

2Volume of moving object

If speaker volume is reduced to accommodate device size constraints, then device compactness improves, but bass performance deteriorates due to insufficient back volume

Engineering Contradiction:

Improvedevice sizeVSAvoidbass performance

Core Design Contradiction:

Volume of moving objectVSReliability

Solution Approach 1:

The patent applies the anti-weight principle by using pre-compressed elastic spacers to provide a counteracting force against external compression forces. This counterforce maintains the speaker box volume against compressive loads, preserving bass performance while allowing the device to have a compact overall size

Inventive Principle:

Principle #8Anti-weight (Counterweight)

Solution Approach 2:

The patent utilizes parameter changes by employing elastic materials with specific compressive properties. The elastic spacers are selected and pre-compressed to provide optimal counterforce, dynamically adjusting the support force based on the compression level to maintain speaker volume under varying loads

Inventive Principle:

Principle #35Parameter changes

3Stability of the object's composition

If rigid support structures are used to maintain speaker volume, then structural stability improves, but device complexity and manufacturing difficulty increase

Engineering Contradiction:

Improvespeaker volume stabilityVSAvoidcasing structure

Core Design Contradiction:

Stability of the object's compositionVSDevice complexity

Solution Approach 1:

The patent employs flexible shells and thin films by using elastic spacers instead of rigid support structures. These elastic elements provide the necessary support force while being simpler in form, reducing manufacturing complexity compared to rigid mechanical support structures while maintaining speaker volume stability

Inventive Principle:

Principle #30Flexible shells and thin films

Solution Approach 2:

The patent applies mechanics substitution by replacing complex rigid mechanical support structures with simpler elastic elements. The elastic spacers use material elasticity rather than complex mechanical linkages or rigid frameworks to achieve the same volume maintenance function, reducing device complexity

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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

Maintains speaker volume and improves bass performance by preventing deformation-induced gaps, thus avoiding 'rub' and 'buzz' effects.

Implementation Method 1

one or more elastic spacers arranged between the first cover part and the second cover part, wherein the one or more elastic spacers are operable to counteract, by their elastic recoil forces, a compression of the speaker volume

Methodology Applied

Scientific EffectElasticity: Elasticity

Data Source

PatentUS12542999B2Bass response for a speaker in a portable computing device

Publication Date: 2026.02.03 DOLBY LABORATORIES LICENSING CORP

AI summary

Methods and systems of improving bass response for a speaker in a portable computing device are described. One portable computing device includes first and second cover parts that are joined together to form a casing of the portable computing device, wherein a speaker volume is formed between portions of the first and second cover parts; a speaker arranged within the speaker volume; and one or more elastic spacers arranged between the first and second cover parts. The one or more elastic spacers are arranged to counteract, by their elastic recoil forces, a compression of the speaker volume when the first and second cover parts are under external compressing forces. The one or more elastic spacers are arranged between the first and second cover parts to be partially compressed by the first and second cover parts in the absence of external compressing forces on the first and second cover parts.