Multi-Unit Loudspeaker Structure for Compact Low-Frequency Output
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Solution Overview
Problem
Existing electromagnetic loudspeakers require a large movement for sufficient low-frequency output, leading to a larger device thickness, which is not suitable for compact designs.
Innovation Solution
A loudspeaker design comprising multiple sound-generating units arranged along a direction, each with a vibration diaphragm and driving structure, forming acoustic cavities and outlet holes, allowing for compact size while maintaining low-frequency output through coordinated vibration and sound wave transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If electromagnetic loudspeakers use large movement to ensure sufficient low-frequency sound pressure level, then low-frequency output performance is improved, but device thickness increases
Solution Approach 1:
The loudspeaker is divided into multiple independent sound-generating units arranged along the thickness direction. Each unit has its own vibration diaphragm and driving structure, allowing the system to achieve sufficient low-frequency output through combined effect while maintaining compact thickness. The segmentation enables parallel sound generation without requiring excessive movement amplitude in each individual unit.
Solution Approach 2:
The patent transitions from a single-unit loudspeaker design to a multi-unit arrangement along the thickness dimension. By stacking multiple sound-generating units in the thickness direction rather than increasing the movement amplitude of a single unit, the system achieves higher sound pressure level without proportionally increasing the required movement space, thus resolving the contradiction between power output and thickness.
2Power
If multiple sound-generating units are arranged along the first direction, then low-frequency output is enhanced, but device complexity increases
Solution Approach 1:
Multiple sound-generating units share common structural elements including the shell, acoustic cavities, and mounting structures. The units are integrated into a unified assembly where adjacent units can share acoustic cavities and structural support, reducing the overall complexity compared to having completely separate loudspeaker systems. The driving structures are independently controllable but mechanically integrated.
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 significant increase in low-frequency sound pressure level without increasing thickness, enhancing acoustic output and flexibility in device dimensions.
Implementation Method 1
each of the plurality of sound-generating units vibrates along the first direction
Implementation Method 2
the shell and the plurality of sound-generating units form a plurality of acoustic cavities, and each of the plurality of acoustic cavities is acoustically coupled to at least one of the plurality of sound outlet holes
Data Source
AI summary
The present disclosure relates to a loudspeaker, including a plurality of sound-generating units arranged at intervals along a first direction, wherein each of the plurality of sound-generating units vibrates along the first direction; a shell configured to accommodate and support the plurality of sound-generating units, the shell being provided with a plurality of sound outlet holes, the shell and the plurality of sound-generating units form a plurality of acoustic cavities. Each acoustic cavity acoustically is coupled to at least one of the sound outlet holes in the shell. Each of the plurality of sound-generating units includes a vibration diaphragm and a driving structure provided on the vibration diaphragm.