Concealed Diaphragm Connection for High-Resistance Piston Loudspeakers
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Solution Overview
Problem
Conventional loudspeakers face challenges in achieving high sound pressure levels at low frequencies due to acoustic short circuits between front and rear cavities, which are exacerbated by large air gaps, leading to reduced acoustic resistance and sound pressure output.
Innovation Solution
A high-acoustic-resistance piston motion loudspeaker with a concealed connecting structure between the vibrating diaphragm and the supporting structure, optimizing the design to minimize air gaps and enhance acoustic resistance, thereby increasing sound pressure levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If a large air gap is used between the front and rear cavities to accommodate the vibrating diaphragm motion, then the vibration displacement range is improved, but the acoustic resistance decreases leading to acoustic short circuit and reduced sound pressure level
Solution Approach 1:
The connecting structure is moved from a coplanar arrangement with the vibrating diaphragm to a non-coplanar concealed arrangement. The connecting structure extends in the thickness direction of the base, creating a three-dimensional configuration where the connection points are positioned above or below the diaphragm plane. This dimensional change allows the air gap to be minimized in the horizontal plane while still accommodating the vertical vibration motion, thereby maintaining high acoustic resistance without restricting displacement range.
2Object-affected harmful factors
If the distance between the edge of the vibrating diaphragm and the sidewall structure is increased to reduce acoustic resistance, then the acoustic resistance is improved, but the sound pressure level is reduced due to air leakage
Solution Approach 1:
The connecting structure is repositioned from the horizontal plane to the vertical dimension, extending in the thickness direction of the base. This allows the vibrating diaphragm to maintain a small distance from the sidewall structure in the horizontal plane, minimizing air leakage paths and maintaining high acoustic resistance, while the vertical extension of the connecting structure provides the necessary motion accommodation.
3Ease of manufacture
If a coplanar connecting structure is used between the vibrating diaphragm and supporting structure, then the manufacturing is simplified, but the air gap between front and rear cavities becomes large causing acoustic short circuit
Solution Approach 1:
The connecting structure transitions from a two-dimensional coplanar arrangement to a three-dimensional non-coplanar configuration. The connecting structure extends vertically in the thickness direction of the base, with connection points positioned above or below the diaphragm plane. This spatial reconfiguration reduces the horizontal air gap between front and rear cavities, preventing acoustic short circuit while remaining compatible with conventional manufacturing processes.
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 concealed connecting structure effectively reduces air leakage and increases acoustic resistance, resulting in improved sound pressure levels and manufacturing flexibility, suitable for traditional and MEMS loudspeakers.
Implementation Method 1
the acoustic resistance is directly proportional to a first power of an air viscosity coefficient and a first power of the air gap length
Implementation Method 2
a mechanical-acoustic energy conversion coefficient corresponding to a piston vibration mode is three times a mechanical-acoustic energy conversion coefficient of a vibrating diaphragm vibration mode
Data Source
AI summary
A high-acoustic-resistance piston motion loudspeaker disclosed in the present disclosure belongs to the field of sound-electricity conversion. The loudspeaker includes a substrate, a driving assembly, a vibrating diaphragm, a connecting assembly and a vibration cavity. The connecting assembly is not coplanar with the vibrating diaphragm, which is of a concealed connecting structure. The driving assembly is configured to drive the vibrating diaphragm to generate a piston motion. The vibrating diaphragm is located in the vibration cavity, and a displacement range of the vibrating diaphragm in a perpendicular direction is within a height range of the vibration cavity formed by a supporting structure extending in a thickness direction of a base, so as to achieve purposes of reducing air leakage and improving a sound pressure level in a working process of the loudspeaker.