Dual Piezoelectric Vibration Structure for Higher Speaker Sound Pressure
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Solution Overview
Problem
Piezoelectric speakers face limitations in enhancing sound pressure level and sound characteristics, particularly in middle-low and middle-high pitched sound bands due to restricted vibration width.
Innovation Solution
An apparatus comprising a vibration apparatus connected to a passive vibration member, with multiple active vibration members arranged in parallel and overlapping configurations, enhancing sound pressure level through synthesized vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If piezoelectric speakers are used, then power consumption is reduced and weight is decreased, but vibration width is limited which prevents enhancement of sound pressure level in various-pitched sound bands
Solution Approach 1:
The patent combines multiple piezoelectric speakers (first and second piezoelectric speakers) into a single vibration apparatus. The first piezoelectric speaker generates vibration in a first direction while the second piezoelectric speaker generates vibration in a second direction, and these vibrations are synthesized to produce enhanced sound pressure level across various-pitched sound bands, thereby resolving the limitation of single-speaker vibration width.
2Device complexity
If a single piezoelectric speaker is used, then device complexity is reduced, but sound pressure level and sound characteristics cannot be enhanced
Solution Approach 1:
The patent merges multiple piezoelectric speakers into one integrated vibration apparatus that maintains relatively simple device complexity while significantly enhancing sound pressure level. The combined vibrations from multiple speakers are synthesized to produce enhanced acoustic output without requiring complex additional components.
Solution Approach 2:
The patent introduces a new dimension of vibration synthesis by combining vibrations from multiple piezoelectric speakers operating in different directions. This multi-dimensional vibration approach enables enhancement of sound pressure level in various-pitched sound bands while maintaining manageable device complexity.
3Power
If multiple piezoelectric speakers are combined in a vibration apparatus, then sound pressure level is enhanced, but device complexity increases
Solution Approach 1:
The patent combines multiple piezoelectric speakers into a unified vibration apparatus where the first and second piezoelectric speakers work together to generate synthesized vibrations. This merging approach enhances sound pressure level while the integrated design keeps device complexity manageable.
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 significantly improves sound pressure level and sound characteristics across various pitched sound bands by increasing displacement width through synchronized vibrations of active vibration members.
Implementation Method 1
Piezoelectric speakers including ferroelectric ceramic or the like are lightweight and have low power consumption
Implementation Method 2
one of the diaphragms is provided, in the opening of the chassis, to have one surface facing an outside of the chassis and an other surface facing an inside of the chassis, and functions as a radiation plate which radiates a sound wave by vibrating at an amplitude generated by synthesizing amplitudes of the first and second piezoelectric diaphragms
Data Source
Figure 1~2
Figure 3~5A
Figure 5B~6B
AI summary
An apparatus includes a vibration apparatus connected to a rear surface of a passive vibration member and a supporting member at the rear surface of the passive vibration member, wherein the vibration apparatus includes a first vibration portion, a second vibration portion connected to a periphery of the first vibration portion, and a connection portion connected to a periphery of the second vibration portion and the rear surface of the passive vibration member.