PCB Speaker Resonance Cavity Using a Shield Can
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Solution Overview
Problem
Existing electronic devices face challenges in achieving high-quality sound output while being miniaturized, as they require efficient use of space for sound resonance and shielding without compromising aesthetics or functionality.
Innovation Solution
The electronic device incorporates a shield can and a printed circuit board (PCB) to form a hermetic resonance space, securing a sealed area for sound resonance without additional space, enhancing sound quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a separate resonance space is added to improve sound quality, then acoustic flatness and low-frequency sound quality improve, but device volume and structural complexity increase
Solution Approach 1:
The patent merges the resonance space function with the shield can structure by forming the resonance space within the shield can's internal cavity. The shield can serves dual purposes: providing electromagnetic shielding and creating a hermetic resonance chamber for the speaker, thereby improving low-frequency sound quality without increasing overall device volume.
Solution Approach 2:
The shield can is designed to perform multiple functions simultaneously: electromagnetic shielding, structural support, and resonance space formation. This multi-functional design allows the device to achieve high-quality sound output without requiring additional dedicated components or space.
2Manufacturing precision
If a hermetic resonance space is created to improve sound quality, then acoustic performance improves, but sealing complexity and manufacturing difficulty increase
Solution Approach 1:
The sealing structure is integrated into the shield can assembly rather than being a separate component. The shield can's wall itself forms the hermetic seal, and the connection between the shield can and housing creates the sealed resonance chamber, simplifying manufacturing by reducing the number of separate sealing components needed.
3Volume of stationary object
If electronic devices are miniaturized to increase portability, then device size decreases, but space for sound resonance and shielding is reduced
Solution Approach 1:
The resonance space is nested within the shield can's internal cavity, utilizing the space already allocated for electromagnetic shielding. This nested arrangement allows the resonance chamber to be embedded within the existing device structure without requiring additional external space, enabling miniaturization while maintaining sound quality.
Solution Approach 2:
The patent utilizes the vertical dimension and internal cavity space of the shield can to create the resonance chamber, rather than requiring additional horizontal or lateral space. This dimensional approach allows high-quality sound resonance in a compact footprint suitable for modern thin electronic devices.
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
This configuration increases spatial utilization and improves sound quality by creating a hermetic resonance space, allowing for high-quality sound output in a compact design.
Implementation Method 1
When the sound wave generated by the speaker resonates in a hermetic space, the performance of the sound emitted to the outside of the electronic device may improve
Implementation Method 2
The resonance space is configured to resonate acoustic vibration to be emitted to the rear of the sound module
Data Source
AI summary
The electronic device may include: a housing; a printed circuit board (PCB) disposed in the housing, the PCB including a first board surface facing a first direction and a second board surface opposite to the first board surface, and having an opening penetrating through a surface thereof, a sound module disposed in the opening so that a front thereof faces the first direction, and electrically connected to the PCB to generate a sound, a shield can connected to the second board surface to cover the opening, in a state in which the second board surface is viewed, and a frame disposed to face the first board surface.