Rectangular Glass Vibration Device for Stable Acoustic Performance
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Solution Overview
Problem
Diaphragms for speakers and microphones with circular or elliptical shapes face challenges in acoustic performance when installed in spaces with greatly different length and width dimensions, such as in vehicles or buildings, leading to unstable excitation and insufficient sound reproduction.
Innovation Solution
A vibration device featuring a plate-like glass vibrator with a specific aspect ratio and arrangement of exciters, including a glass sheet composite with a fluid layer between glass sheets, to achieve stable excitation and improved acoustic performance in non-standard shapes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a circular or elliptical diaphragm is used, then acoustic performance is improved in standard spaces, but adaptability to non-standard installation spaces with greatly different length and width dimensions deteriorates
Solution Approach 1:
The invention applies asymmetry by designing a diaphragm with a rectangular shape where the length-to-width ratio is controlled within a specific range (1.2 to 50). This asymmetric rectangular configuration allows the diaphragm to adapt to non-standard installation spaces with greatly different length and width dimensions, while still maintaining stable excitation and sufficient acoustic performance. The exciter arrangement is also optimized asymmetrically to match the rectangular geometry.
2Adaptability or versatility
If the length and width of the diaphragm are greatly different, then adaptability to non-standard spaces is improved, but stability of excitation deteriorates
Solution Approach 1:
The invention applies parameter changes by establishing specific parameter ranges for the diaphragm geometry (length-to-width ratio between 1.2 and 50) and for the exciter arrangement (spacing and positioning). By controlling these parameters within defined ranges, the invention achieves both adaptability to non-standard spaces and stability of excitation. The parameter optimization ensures that even with greatly different length and width dimensions, the diaphragm can be excited stably.
3Ease of manufacture
If conventional materials like cone paper or resin are used, then ease of manufacture is improved, but acoustic velocity and sound reproduction performance in radio frequency range deteriorate
Solution Approach 1:
The invention applies composite materials by using glass as the diaphragm material instead of conventional cone paper or resin. Glass provides high acoustic velocity and excellent sound reproduction performance in the radio frequency range (20 kHz and higher). The glass diaphragm can be manufactured with precise dimensional control to achieve the required rectangular shape and aspect ratio, balancing ease of manufacture with superior acoustic performance.
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 vibration device ensures stable excitation and maintains sufficient acoustic performance even in shapes with greatly different dimensions, enhancing sound reproduction and reducing sound pressure variation across frequencies.
Implementation Method 1
a plurality of exciters that are attached to the glass vibrator and are configured to generate vibration according to an input electrical signal
Implementation Method 2
a glass sheet composite in which a fluid layer including liquid is disposed between at least a pair of glass sheets among the glass sheets
Data Source
AI summary
A vibration device includes a plate-like glass vibrator and a plurality of exciters that are attached to the glass vibrator and configured to generate vibration according to an input electrical signal. An aspect ratio La/Lb of a length La of a longer side to a length Lb of a shorter side of a rectangle in which the glass vibrator is inscribed is 1.2 to 50. Provided that the number of the exciters is n and a minimum value of distance between the exciters is Smin, a relational value α (α=Smin−1)/La) is 0.2 to 0.8. In the case where the number n of exciters is 3 or larger, a value β(β=Sσ/Save) obtained by dividing a standard deviation Sσ of distances by an average Save of the distances between the exciters is 0 to 0.5.