Piezoelectric Speaker Structure with Pad-Supported Low-Frequency Vibration
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Piezoelectric speakers suffer from insufficient sound pressure levels in the low-pitched sound band due to high stiffness, limiting their sound characteristics and design flexibility in devices.
Innovation Solution
An apparatus comprising a vibration member, a supporting member with a hole region, an enclosure, and a pad member, which optimize the vibration region to enhance low-pitched sound band output by adjusting resonance frequencies and sound pressure levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If piezoelectric elements are used to reduce thickness, then the thickness is reduced, but the stiffness increases causing insufficient low-pitched sound pressure level
Solution Approach 1:
The vibration member is divided into a front surface portion and a rear surface portion that are selectively connected to the piezoelectric element. This segmentation allows the front surface to have lower stiffness for low-pitched sound generation while the rear surface provides structural support, resolving the contradiction between thinness and insufficient low-frequency output.
Solution Approach 2:
Different regions of the vibration member are designed with different stiffness characteristics. The front surface portion has lower stiffness to enhance low-pitched sound pressure, while the rear surface portion maintains higher stiffness for structural integrity. This local differentiation allows the thin piezoelectric structure to produce sufficient low-frequency sound.
2Power
If the vibration region is expanded to enhance low-pitched sound, then the low-pitched sound pressure level increases, but the high-pitched sound may be affected
Solution Approach 1:
The piezoelectric element is configured with different connection states for its front and rear surface portions to the vibration member. This local differentiation enables the center region to vibrate freely for low-pitched sound enhancement while the peripheral regions maintain coupling for high-pitched sound generation, allowing both frequency ranges to perform optimally.
Solution Approach 2:
The connection between the piezoelectric element and vibration member is designed to be dynamically adjustable through selective connection of front and rear surface portions. This dynamic configuration allows the system to optimize vibration characteristics for different frequency ranges, expanding the low-pitched sound region without compromising high-pitched sound quality.
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 enhances sound characteristics and sound pressure levels in the low-pitched sound band, allowing for output in both directions while minimizing interference and improving design flexibility.
Implementation Method 1
a vibration apparatus configured to vibrate the vibration member
Data Source
AI summary
An apparatus includes a vibration member, a vibration apparatus configured to vibrate the vibration member, a supporting member at a rear surface of the vibration apparatus and the vibration member, the supporting member including a hole region overlapping the vibration apparatus, an enclosure configured between the vibration member and the supporting member to surround the vibration apparatus, and a pad member between the vibration apparatus and the hole region of the supporting member. The pad member may be connected to one or more of the rear surface of the vibration apparatus and the supporting member.