Speaker Assembly Resonant Cavity Design for Max SPL
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The challenge is to increase the maximum sound pressure level (max SPL) of a speaker assembly without increasing its volume or to maintain max SPL while reducing the volume of the display device.
Innovation Solution
A speaker assembly design featuring a mounting box with specific sidewalls and a bottom plate that forms an opening, allowing for the installation of supplemental magnets and a resonant cavity with a backlight module, which enhances sound pressure while minimizing device thickness and weight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the volume of the speaker assembly is increased to increase max SPL, then the max SPL is improved, but the volume or thickness of the display device is increased
Solution Approach 1:
The speaker assembly is segmented into multiple functional components: a first speaker and a second speaker positioned at different locations within the mounting box. This segmentation allows each speaker to contribute to the overall sound pressure level, achieving higher max SPL without increasing the total volume of the display device.
Solution Approach 2:
The patent utilizes the third dimension (depth/thickness) by positioning speakers at different depths within the mounting box structure. The first speaker is positioned closer to the front while the second speaker is positioned closer to the back, effectively using the Z-axis dimension to maximize sound pressure within the constrained volume of the display device.
2Volume of moving object
If the volume of the speaker assembly is decreased to reduce display device thickness, then the volume is reduced, but the max SPL deteriorates
Solution Approach 1:
The patent merges the functions of multiple speakers into a single integrated mounting box structure. The first speaker and second speaker work together in conjunction with the resonant cavity formed by the mounting box and backlight module, creating a synergistic effect that maintains high max SPL while minimizing the overall volume of the display device.
Solution Approach 2:
The mounting box serves multiple functions simultaneously: it acts as a structural support, a resonant cavity for acoustic enhancement, and a mounting structure for both speakers. The backlight module also contributes to forming the resonant cavity. This multi-functionality allows the system to achieve high sound pressure levels without requiring additional dedicated space, thereby reducing the overall volume and thickness of the display device.
3Power
If supplemental magnets are added to enhance sound pressure, then the sound pressure is improved, but the device complexity increases
Solution Approach 1:
The mounting box and backlight module automatically form a resonant cavity that enhances sound pressure without requiring additional active components or complex control systems. The cavity's natural acoustic resonance properties provide the sound enhancement effect, allowing the system to achieve improved sound pressure while maintaining relatively simple device architecture.
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 solution achieves higher sound pressure and thinner screen thickness by optimizing the speaker assembly's design within the limited space, providing better sound quality and reduced noise from vibrations and collisions.
Implementation Method 1
the speaker and the three sidewalls define an opening... define a resonant cavity
Data Source
AI summary
A speaker assembly has a mounting box and a speaker. The mounting box has one bottom plate, a first sidewall, a second sidewall, and a third sidewall. The speaker is mounted on the mounting box. The third sidewall is between the first sidewall and the second sidewall, and the speaker and the three sidewalls define an opening. A display device has a casing, a backlight module and the aforementioned speaker assembly. The backlight module is in the casing, and the speaker assembly is located in a space defined by the casing and the backlight module.