Partitioned Headrest Audio Structure for Aircraft Seat Sound Containment

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Solution Overview

Problem

In aircraft environments, using headphones or earphones for sound reproduction leads to sound leakage to surrounding seats, causing discomfort to other passengers, and prolonged use can be burdensome for the wearer.

Innovation Solution

A sound reproduction device with a headrest portion and partition portions that store the user's head, incorporating speakers and sound absorbing structures, uses head detection sensors and microphones to control sound output, minimizing leakage by adjusting frequency bands and pausing reproduction when the user is away.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If headphones or earphones are used for sound reproduction in aircraft, then sound can be delivered to the user, but sound leakage occurs to surrounding seats causing discomfort to other passengers

Engineering Contradiction:

Improvesound leakage to surrounding seatsVSAvoidburden on passenger for prolonged wearing

Core Design Contradiction:

Object-affected harmful factorsVSEase of operation

Solution Approach 1:

The patent introduces a headrest portion with partition portions as an intermediary structure between the speaker and the surrounding environment. This structure creates a localized sound field around the user's head while physically blocking sound propagation to adjacent seats, thereby resolving the contradiction between sound delivery and sound leakage prevention

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The sound absorbing structures are selectively applied to specific regions (front, rear, and side surfaces of the headrest portion) rather than uniformly across the entire structure. This localized application optimizes sound absorption where needed to prevent leakage while maintaining ease of manufacture and reducing material usage

Inventive Principle:

Principle #3Local quality

2Ease of operation

If speakers are used without headphones in aircraft, then user comfort is improved, but sound leakage to surrounding seats occurs

Engineering Contradiction:

Improveuser comfort without wearing headphonesVSAvoidsound leakage to surrounding seats

Core Design Contradiction:

Ease of operationVSObject-affected harmful factors

Solution Approach 1:

The headrest portion with partition portions acts as a physical intermediary that confines sound waves within a localized area around the user's head. This structure enables comfortable speaker-based sound reproduction without headphones while preventing sound from reaching surrounding seats

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

Sound absorbing structures made of porous or acoustically absorptive materials are integrated into the headrest portion. These materials absorb sound waves that might otherwise leak to surrounding seats, enabling comfortable open-ear sound reproduction while minimizing harmful sound leakage

Inventive Principle:

Principle #31Porous materials

3Object-affected harmful factors

If sound absorbing structures are added to the partition portion, then sound leakage is reduced, but device complexity increases

Engineering Contradiction:

Improvesound leakage preventionVSAvoidstructure complexity of headrest and partition

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

Sound absorbing structures are applied selectively to specific surfaces of the headrest portion (front, rear, and side surfaces) rather than the entire structure. This localized approach effectively reduces sound leakage while minimizing the increase in device complexity and manufacturing difficulty

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The headrest portion serves multiple functions simultaneously: it provides head support, creates a localized sound field, and incorporates sound absorbing structures to prevent leakage. This multi-functionality reduces the need for separate components, thereby limiting the increase in device complexity

Inventive Principle:

Principle #6Universality (Multi-functionality)

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

Enables clear sound reproduction for the user while preventing sound leakage to adjacent seats, reducing discomfort and burden on the passenger.

Implementation Method 1

a sound absorbing structure provided in at least a part of the inner surface of the partition portion

Methodology Applied

Scientific EffectSound absorption: Acoustic Absorption

Data Source

PatentUS12490003B2Sound reproduction device

Publication Date: 2025.12.02 PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD

AI summary

A sound reproduction device is configured to store a head of a user and reproduce sound. The sound reproduction device includes: a headrest portion; a partition portion attached to the headrest portion so as to protrude forward relative to a front surface of the headrest portion; a speaker disposed in the partition portion; and a sound absorbing structure provided in at least a part of the inner surface of the partition portion excluding a region corresponding to an output surface of the speaker.