Opposite-Vibrating Speaker Diaphragms for Compact Low-Distortion Audio
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Solution Overview
Problem
Existing speaker devices face challenges in reducing size while maintaining high power and low distortion, due to asymmetrical diaphragm supporting and drive forces, which lead to phase interference and degraded sound quality.
Innovation Solution
A speaker device configuration featuring a first and second speaker unit with opposite radiation directions, where the diaphragms vibrate in opposite directions, reducing path length differences and eliminating asymmetry in drive forces and cabinet vibrations, thereby preventing distortion and improving sound quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the size of a speaker device is reduced, then the occupied area is reduced, but the supporting forces and drive forces of the diaphragms become asymmetrical causing distortion
Solution Approach 1:
The patent applies asymmetry principle by intentionally designing the cabinet structure with asymmetric supporting members that compensate for the natural asymmetry caused by reduced size. The supporting members are positioned and dimensioned differently to balance the drive forces on both diaphragms, allowing compact design while maintaining force symmetry.
Solution Approach 2:
The patent uses local quality by providing different supporting structures at different locations within the cabinet. The edge members and supporting structures are locally optimized to provide appropriate support forces to each diaphragm based on its specific position and requirements, ensuring symmetric drive forces despite overall compact dimensions.
2Area of stationary object
If the distance between openings is reduced for compact design, then the occupied area is reduced, but path length difference increases causing phase interference and degraded sound quality
Solution Approach 1:
The patent resolves the path length difference issue by transitioning from a horizontal arrangement to a vertical stacking configuration. The first and second speaker units are arranged in the vertical dimension rather than horizontal, allowing compact footprint while maintaining equal acoustic path lengths from both diaphragms to the listening position.
3Area of stationary object
If the size is reduced, then the occupied area is reduced, but the drive system members cannot ensure sufficient sizes leading to asymmetrical forces
Solution Approach 1:
The patent applies nesting principle by placing the first speaker unit and second speaker unit in a stacked vertical arrangement within the cabinet. This nested-like configuration allows both complete drive systems with sufficient-sized members to be accommodated in a compact overall footprint by utilizing the vertical dimension.
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 configuration effectively reduces distortion and phase interference, enhancing sound quality and allowing for a compact design without compromising power or clarity.
Implementation Method 1
a first speaker unit including a first diaphragm and a first magnetic circuit that drives the first diaphragm, where the first diaphragm reproduces an audio signal including a predetermined frequency range, a second speaker unit including a second diaphragm and a second magnetic circuit that drives the second diaphragm
Implementation Method 2
the first diaphragm and the second diaphragm vibrate in opposite directions... vibrations generated by the vibrating diaphragms of the first speaker unit 83 and the second speaker unit 84 are canceled out
Implementation Method 3
the distance between the first opening 85a and the second opening 85b is long. Accordingly, a path length difference between the sounds played back by the first speaker unit 83 and the second speaker unit 84 is large. Thus, the phase interference occurs
Data Source
AI summary
A speaker device for reproducing an audio signal includes a first speaker including a first diaphragm and a first magnetic circuit that drives the first diaphragm, where the first diaphragm reproduces an audio signal including a predetermined frequency range, a second speaker including a second diaphragm and a second magnetic circuit that drives the second diaphragm, where the second diaphragm reproduces an audio signal including a frequency range substantially the same as the predetermined frequency range, and at least one cabinet having the first speaker and the second speaker mounted therein so that radiation directions of sounds are opposite to each other. At least part of a space formed between the first speaker and the second speaker communicates with the outside of the cabinet. When the speaker device reproduces the audio signal, the first diaphragm and the second diaphragm vibrate in opposite directions.