Portable Speaker Back Sound Chamber Design
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Solution Overview
Problem
Existing portable electronic devices, such as cellular phones, face challenges in maintaining sound quality due to sound leakage from incomplete back sound chambers caused by assembly gaps and increased manufacturing costs from fully enclosing the chamber using injection molding, which also limits maintenance convenience.
Innovation Solution
A portable electronic apparatus design featuring a case with limiting portions, a speaker, a sound box cover, and circuit boards, where the sound box cover forms an enclosed back sound chamber with the case and speaker, allowing for secure sound transmission without leakage and easy disassembly for maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If injection molding is used to fully cover the speaker and form an entirely closed back sound chamber, then sound quality is improved, but manufacturing costs increase and maintenance becomes more difficult
Solution Approach 1:
The back sound chamber is formed by separating the case and speaker assembly from the full-phone body, creating a detachable module. This allows the sound chamber to be enclosed without requiring full-phone injection molding, reducing manufacturing complexity and cost while maintaining sound quality.
Solution Approach 2:
The speaker and back sound chamber are extracted as a separate assembly that can be independently manufactured and then integrated into the full-phone body. This extraction eliminates the need for complex full-phone injection molding while still achieving an enclosed sound chamber, thereby reducing manufacturing costs.
2Reliability
If injection molding is used to fully cover the speaker and form an entirely closed back sound chamber, then sound quality is improved, but maintenance convenience deteriorates
Solution Approach 1:
The speaker assembly with back sound chamber is segmented as a separate module that can be independently removed from the full-phone body. This segmentation enables easy maintenance and repair by allowing technicians to access and replace the speaker assembly without disassembling the entire phone.
Solution Approach 2:
The speaker and back sound chamber are extracted as a detachable module, allowing for easy removal and replacement during maintenance. This extraction design provides maintenance convenience while still achieving an enclosed sound chamber structure.
3Ease of manufacture
If the back sound chamber is not entirely closed due to assembly gaps and earphone plug holes, then manufacturing is easier, but sound leakage occurs and sound quality deteriorates
Solution Approach 1:
The case and speaker assembly are merged into a tightly integrated unit where the speaker is positioned within the case structure. This merging creates a naturally enclosed back sound chamber that prevents sound leakage while maintaining ease of assembly through the integrated design.
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 achieves superior sound quality by preventing sound leakage and reducing manufacturing costs through a detachable sound box cover, enhancing maintenance convenience and sound quality while maintaining a compact form.
Implementation Method 1
the magnet forms a magnetic loop and electric current passes through the voice coil disposed in the speaker, which generates a driving force in an up-down direction and causes the vibration board to vibrate
Implementation Method 2
At this time, air vibrated by the vibration board generates sound. Sound waves generated by the vibration of the vibration board are transmitted between the front sound chamber and the back sound chamber
Data Source
AI summary
A portable electronic apparatus including a case, a speaker, a sound box cover, a first circuit board and a second circuit board is provided. The case has a sound hole and a plurality of limiting portions disposed around the sound hole. The speaker corresponding to the sound hole is disposed in the case. The sound box cover covers the speaker to define a back sound chamber among the sound box cover, the case and the speaker. The first circuit board is disposed in the case. The second circuit board with a first surface, a second surface and a plurality of pads is disposed on the sound box cover. The second circuit board is exposed on the sound box cover with the first surface. The second circuit board electrically connects to the first circuit board and the speaker through the pads respectively disposed on the first and the second surface.