Parallel Vibration Speaker Structure for Thin, Reliable Sound Output
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Solution Overview
Problem
Conventional sound output devices, particularly those using piezoelectric elements, face challenges in maintaining a thin profile while ensuring reliability due to fragility, which can lead to damage from external impacts and compromise sound reproduction quality, especially when integrated into flexible apparatuses.
Innovation Solution
An apparatus comprising a passive vibration member and active vibration members with parallel vibration portions, a signal separation circuit, filter circuit, correction circuit, mixing circuit, and driving signal generator to enhance sound pressure levels, particularly for low-pitched sound bands, by separating and correcting input signals to optimize vibration and sound output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If piezoelectric elements are used to maintain a thin profile, then the thickness of the apparatus is reduced, but the reliability deteriorates due to fragility and susceptibility to external impacts
Solution Approach 1:
The active vibration member is divided into first and second vibration portions that are arranged in parallel. This segmentation allows the piezoelectric elements to be distributed across multiple sections, reducing the risk that damage to one portion will completely compromise the sound reproduction function.
Solution Approach 2:
Different vibration portions are driven by different driving signals (first driving signal for first vibration portion, second driving signal for second vibration portion) that are processed through separate signal paths including signal separation, filtering, correction, and mixing circuits. This allows localized optimization of vibration characteristics for different regions.
2Device complexity
If a single active vibration member is used, then the device complexity is reduced, but the sound pressure level particularly in low-pitched sound bands is insufficient
Solution Approach 1:
The first and second vibration portions are arranged in parallel and their vibrations are combined to produce enhanced sound pressure levels. The mixing circuit combines the processed signals from both portions, creating a synergistic effect that boosts overall acoustic output, particularly in low-pitched bands.
Solution Approach 2:
The patent utilizes mechanical vibration principles by driving multiple vibration portions with optimized driving signals that enhance resonant frequencies and vibration amplitudes. The parallel arrangement of vibration portions creates constructive interference patterns that amplify sound pressure levels.
3Reliability
If the piezoelectric elements are made more robust to improve reliability, then the thickness of the apparatus increases
Solution Approach 1:
By segmenting the vibration function across multiple parallel portions, the patent reduces the stress and impact load on individual piezoelectric elements. This allows the use of thinner, more fragile elements while maintaining overall system reliability through redundancy.
Solution Approach 2:
The patent changes the operational parameters by applying different driving signals to different vibration portions. This allows optimization of the vibration characteristics and stress distribution, enabling the use of thinner piezoelectric elements that would otherwise be too fragile under uniform high-stress conditions.
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 and sound quality, particularly in the low-pitched sound band, by optimizing the vibration and signal processing, thereby improving the reliability and durability of sound reproduction.
Implementation Method 1
a vibration layer 21a, a first electrode layer 21b, and a second electrode layer 21c The vibration layer 21a may include a piezoelectric material
Implementation Method 2
an active vibration member 20 connected to a passive vibration member 10
Data Source
AI summary
An apparatus may include a passive vibration member and an active vibration member connected to the passive vibration member and including first and second vibration portions arranged in parallel with each other. The apparatus may further include a driving apparatus configured to apply a first driving signal to the first vibration portion and a second driving signal to the second vibration portion, based on an input signal, to vibrate the first vibration portion and the second vibration portion.