Piezoelectric Speaker Vibration Member Segmentation

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Piezoelectric speakers have a low sound pressure level for low-pitched sound bands due to high stiffness, which limits their effectiveness in producing sufficient sound pressure levels across all frequency bands.

Innovation Solution

An apparatus with a vibration member having an internal space and a vibration device that reduces the lowest resonance frequency, enhancing sound characteristics and pressure levels for low-pitched sound bands, while maintaining low power consumption and lightness, by using a piezoelectric device and optional middle members to improve sound pressure level flatness.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Use of energy by moving object

If piezoelectric devices are used in piezoelectric speakers, then the apparatus becomes lightweight and consumes low power, but the sound pressure level of the low-pitched sound band becomes insufficient

Engineering Contradiction:

Improvepower consumptionVSAvoidsound pressure level of low-pitched sound band

Core Design Contradiction:

Use of energy by moving objectVSReliability

Solution Approach 1:

The vibration member is divided into multiple vibration regions (first, second, third vibration regions) that can vibrate independently or collectively. This segmentation allows different regions to contribute to different frequency bands, enabling the low-pitched sound band to be enhanced while maintaining the lightweight and low power consumption characteristics of piezoelectric devices.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent introduces a vertical dimension by stacking multiple vibration regions in the thickness direction of the vibration member. This multi-layer structure enables enhanced low-pitched sound production without increasing the horizontal footprint or weight significantly, while the piezoelectric devices continue to operate at low power consumption.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Weight of moving object

If piezoelectric devices are used in piezoelectric speakers, then the apparatus becomes lightweight, but the sound pressure level of the low-pitched sound band becomes insufficient

Engineering Contradiction:

Improveweight of apparatusVSAvoidsound pressure level of low-pitched sound band

Core Design Contradiction:

Weight of moving objectVSReliability

Solution Approach 1:

The vibration member is segmented into multiple vibration regions that can be controlled independently. This allows the apparatus to maintain a lightweight design while enhancing low-pitched sound pressure level through coordinated vibration of multiple regions, avoiding the need for heavier traditional speaker components.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The vibration member is formed as an integrated structure that may incorporate composite material characteristics, allowing it to achieve both lightweight properties and enhanced acoustic performance across different frequency bands through its multi-region design.

Inventive Principle:

Principle #40Composite materials

3Reliability

If the vibration member has multiple vibration regions, then the sound pressure level of the low-pitched sound band is enhanced, but the device complexity increases

Engineering Contradiction:

Improvesound pressure level of low-pitched sound bandVSAvoidstructure of vibration member

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

Multiple vibration regions are merged into a single integrated vibration member structure. This combining approach enhances low-pitched sound pressure level while avoiding the complexity of separate components, as all vibration regions are formed as one unified piece that can be controlled collectively or independently as needed.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The vibration member with multiple vibration regions serves multiple functions: it can vibrate collectively for low-pitched sounds and potentially independently for higher frequency sounds. This multi-functionality enhances acoustic performance across different frequency bands without requiring separate dedicated components for each function.

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

The apparatus effectively enhances sound pressure levels for low-pitched sound bands and improves the flatness of sound pressure levels across a wide frequency range, achieving better sound reproduction with reduced resonance frequency and maintaining lightweight and low power consumption.

Implementation Method 1

piezoelectric speakers including a piezoelectric device are known as being lightweight and providing low power consumption

Methodology Applied

Scientific EffectPiezoelectric effect: Piezoelectric Effect

Implementation Method 2

a vibration device configured to vibrate the vibration member

Methodology Applied

Scientific EffectVibration: Vibration

Data Source

PatentUS20240223963A1apparatus

Publication Date: 2024.07.04 LG DISPLAY CO LTD

AI summary

An apparatus is provided for outputting sound. The apparatus includes a vibration member including an internal space and a vibration device configured to vibrate the vibration member. The apparatus may enhance a sound characteristic of a low-pitched sound band as well as a high-pitched sound band. Further, the apparatus may provide a wide pitched sound band and improve a flatness of a sound pressure level.