Vibratable Sheet Acoustic Duct for Compact Speaker Impedance
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Solution Overview
Problem
In compact electronic devices, the narrow acoustic ducts adjacent to speakers cause acoustic impedance increases, leading to degradation of sound characteristics, especially when the devices are used in waterproof and dustproof conditions.
Innovation Solution
An electronic device design incorporating a vibratable sheet between the speaker and the housing, forming an acoustic duct that reduces acoustic impedance by allowing the sheet to vibrate and transfer sound from the speaker to the side face, maintaining lateral emission while minimizing sound leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the acoustic duct is made narrow to fit compact device design, then device size is reduced, but acoustic impedance increases causing sound characteristic degradation
Solution Approach 1:
The patent introduces a vibratable sheet that dynamically responds to acoustic pressure changes. The sheet transitions from a static barrier to a dynamic element that moves with sound waves, allowing the compact acoustic duct to maintain low acoustic impedance despite its narrow dimensions. The vibratable sheet adapts its position and shape according to the acoustic signal, resolving the contradiction between compact size and acoustic performance.
Solution Approach 2:
The patent changes the physical state and mechanical properties of the sheet material to create a vibratable structure. By selecting materials with specific elasticity and density characteristics, the sheet can vibrate at various frequencies while maintaining structural integrity. This parameter change allows the acoustic duct to function effectively in a compact form factor without suffering from high acoustic impedance.
2Ease of operation
If the acoustic duct is made narrow to achieve lateral emission, then sound directionality is improved, but acoustic tremor occurs due to increased acoustic impedance
Solution Approach 1:
The vibratable sheet dynamically compensates for acoustic pressure variations in the narrow duct, preventing the formation of acoustic tremors. The sheet moves in response to sound waves, maintaining pressure equilibrium and eliminating the harmful acoustic vibrations that would otherwise occur in the constrained lateral emission path.
Solution Approach 2:
The vibratable sheet acts as an intermediary element between the sound source and the narrow acoustic duct. It mediates the interaction between the acoustic signal and the constrained duct geometry, transforming the harmful high-impedance interaction into a beneficial dynamic response that maintains sound quality while enabling lateral emission.
3Stability of the object's composition
If a rigid structure is used for the acoustic duct, then structural stability is improved, but sound transmission is degraded due to acoustic impedance mismatch
Solution Approach 1:
The patent replaces the rigid structure with a flexible vibratable sheet that forms the acoustic duct walls. This thin film structure provides sufficient structural stability while maintaining acoustic transparency. The flexibility of the sheet allows it to vibrate with sound waves, creating an acoustic environment that mimics a larger, less constrained space, thereby improving sound transmission despite the compact dimensions.
Solution Approach 2:
The vibratable sheet is constructed from composite materials that combine structural integrity with acoustic flexibility. These materials provide the necessary mechanical strength to maintain the acoustic duct shape while allowing sufficient vibration and sound transmission. The composite structure resolves the contradiction between rigidity and 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 design enhances acoustic characteristics by reducing acoustic impedance and preventing sound tremors, thereby improving sound quality and maintaining emission pressure across various frequency bands.
Implementation Method 1
a sheet disposed between the plate and the speaker, and an acoustic duct defined at least in part by the sheet and the support portion, the acoustic duct being spaced apart from the plate and extending from the sound outlet of the speaker to a part of the side face
Implementation Method 2
The design enhances acoustic characteristics by reducing acoustic impedance and preventing sound tremors
Data Source
AI summary
An electronic device is disclosed. According to an embodiment of the disclosure, the electronic device comprises a housing including a plate defining a first face of the electronic device and a side portion extending along an edge of the plate and defining a side face of the electronic device, a speaker including a sound outlet disposed in a support portion of the housing extending from the side member to an inner space of the electronic device, the sound outlet disposed in a direction facing the first face, a sheet disposed between the plate and the speaker, and an acoustic duct defined in part by the sheet and the support portion, spaced apart from the plate, and extending from the sound outlet of the speaker to the side face.