Sound Generator Vertical Housing for Compact Rear Cavity
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Solution Overview
Problem
Existing sound generating devices face challenges in miniaturization while maintaining good low-frequency performance and acoustic quality due to limited rear cavity volume and irregular cavity shapes, leading to increased size and acoustic resistance issues.
Innovation Solution
A sound generator design with a housing that extends downward to form a large, regular rear cavity below the vibration and magnetic circuit systems, incorporating rear sound holes and sound absorbing materials to enhance acoustic performance and reduce size, without increasing horizontal space occupation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the rear cavity volume is increased to improve low-frequency performance, then the acoustic performance is improved, but the device volume increases
Solution Approach 1:
The patent changes the spatial arrangement by extending the housing in the vertical direction (height dimension) to create the rear cavity, rather than expanding it horizontally. The second portion of the housing extends downward from the first portion, forming a rear cavity between the second portion, the magnetic circuit system, and the housing bottom wall. This vertical extension allows sufficient rear cavity volume for low-frequency performance while maintaining a compact horizontal footprint for miniaturization.
2Volume of stationary object
If the housing is extended horizontally to form a rear cavity, then the rear cavity volume is increased, but the horizontal space occupation increases
Solution Approach 1:
The patent resolves this contradiction by transitioning from horizontal to vertical spatial arrangement. The housing comprises a first portion and a second portion that extends downward from the first portion. The rear cavity is formed in the vertical direction between the second portion, the magnetic circuit system, and the housing bottom wall, thereby achieving sufficient rear cavity volume without increasing horizontal space occupation.
3Volume of stationary object
If the rear cavity shape is irregular to maximize volume, then the rear cavity volume is increased, but the airflow stability deteriorates
Solution Approach 1:
The patent applies different structural characteristics to different regions of the housing. The first portion of the housing has a regular shape (such as a rectangular parallelepiped) to ensure stable airflow, while the second portion extends downward to provide the necessary rear cavity volume. This localized differentiation allows the rear cavity to achieve sufficient volume while maintaining regular shapes in airflow-critical regions for stable airflow and reduced distortion.
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 design achieves miniaturization while maintaining or improving acoustic performance by optimizing the rear cavity volume and shape, simplifying manufacturing, and reducing acoustic resistance, thus providing better sound quality and stability.
Implementation Method 1
a magnetic gap accommodating the voice coil is formed between the central magnetic circuit portion and the side magnetic circuit portion
Implementation Method 2
a rear cavity which is in communication with the rear sound hole is formed between the second portion of the housing, the bottom surface of the magnetic circuit system and the housing bottom wall or the lower cover plate
Data Source
AI summary
A sound generator, which comprises: a housing, a vibration system and a magnetic circuit system. The vibration system and the magnetic circuit system are sequentially accommodated and fixed at a first end of the housing from top to bottom; the magnetic circuit system is provided with a rear sound hole; the housing comprises a first portion corresponding to the vibration system and the magnetic circuit system, and a second portion integrally extending downward from the first portion beyond a bottom surface of the magnetic circuit system; a second end portion of the housing is integrally provided with a housing bottom wall or separately mounted with a lower cover plate; and a rear cavity which is in communication with the rear sound hole is formed between the second portion of the housing, the bottom surface of the magnetic circuit system, and the housing bottom wall or the lower cover plate.