45mm Moving-Coil Speaker with Positioning Bone and Air Vents
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Solution Overview
Problem
Conventional moving-coil speakers with diameters of 40 mm are too small, resulting in insufficient sound pressure, while those with 50 mm diameters are bulky, and existing designs face challenges with adhesive-backed tuning paper attachment and frequency-response optimization.
Innovation Solution
A moving-coil speaker with a 45 mm diameter, featuring a magnetic circuit unit, toroidal support with a positioning bone and symmetrical air holes, and a diaphragm with a metallic coating and ribs, optimized for balanced air permeability and vibration equilibrium.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a speaker with diameter of 40 mm is used, then the structure is compact, but the sound pressure is insufficient
Solution Approach 1:
The patent optimizes parameters including the diameter (45 mm), the positioning of air holes at specific angles (20 degrees from the extending line of the middle axis), and the distribution pattern of air holes to achieve balanced air permeability. These parameter changes improve the frequency-response characteristics and sound pressure while maintaining a compact size that balances between 40 mm and 50 mm speakers.
2Object-generated harmful factors
If a speaker with diameter of 50 mm is used, then the sound pressure is sufficient, but the structure becomes bulky
Solution Approach 1:
The patent achieves sufficient sound pressure with a reduced diameter of 45 mm by optimizing the air hole distribution pattern and positioning. The symmetrical arrangement of air holes at specific angles and distances creates balanced air permeability, allowing the smaller speaker to achieve frequency-response characteristics comparable to or better than conventional 50 mm speakers.
3Ease of manufacture
If adhesive-backed tuning paper is used on conventional support, then the attachment is simple, but the paper deflects and causes high scrap rate
Solution Approach 1:
The patent incorporates a positioning bone structure on the support before the tuning paper is attached. This preliminary positioning feature guides the adhesive-backed tuning paper into correct alignment, preventing deflective attachment. The positioning bone ensures that the tuning paper is accurately positioned during assembly, thereby reducing the scrap rate while maintaining the simplicity of adhesive-backed attachment.
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 a balanced size and improved frequency-response characteristics, reducing scrap rates and enhancing sound pressure while maintaining a compact form factor.
Implementation Method 1
A driving unit of the moving-coil earphone is substantially a small size moving-coil speaker in which a voice coil in a permanent magnetic field drives a vibration membrane (or diaphragm) connected to the voice coil to vibrate
Implementation Method 2
two groups of air holes are provided symmetrically on the support on both sides of the positioning bone... balanced air permeability is resulted
Data Source
AI summary
A moving-coil speaker includes: a magnetic path unit (1); an annular frame (3) connected to exterior of the magnetic path unit (1) and used to carry a membrane (2); and a PCB (4) installed on the frame (3) and used to solder thereon a component or provide electrical conduction. An outer perimeter of the frame (3) is 45 mm. A positioning pin (5) is disposed at a front side of the frame (3) and overlapping with a central axle extension line of the PCB (4). Two sets of air vents (6) are provided on the frame on two sides of the positioning pin (5). A tune paper (7) is pasted on the surface of the frame (3) on the two sides of the positioning pin (5). A distance between the positioning pin (5) and the center of a first air vent at the starting place of each set of air vents (6) is equivalent to a distance between a side of the PCB (4) and the center of a second air vent at the last place of each set of air vents (6). The Φ45 mm speaker is a balance between a Φ40 mm speaker and a Φ50 mm speaker, and can meet requirements with respect to structures and appearances for this type of earphones.