Dual-Surface Voice Coil Speaker for Thin TV Sound Quality
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Solution Overview
Problem
Conventional compact thin speakers face issues with sound quality deterioration due to deformation caused by environmental changes and the inability to enhance sound quality in line with advancements in TV picture quality, primarily due to uneven elongation of the voice coil on the diaphragm's surfaces.
Innovation Solution
A compact thin speaker design featuring ring-shaped voice coils on both surfaces of the diaphragm, with specific positioning and electrical connection to prevent deformation and adhesion failures, while maximizing magnetic flux density at the primary resonance mode node for improved sound quality and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a copper foil pattern is formed only on the upper surface of the diaphragm as a voice coil, then the speaker structure is simplified and manufacturing is easier, but uneven elongation occurs between upper and lower surfaces causing deformation and sound quality deterioration
Solution Approach 1:
The voice coil is segmented into two separate copper foil patterns: one on the upper surface and one on the lower surface of the diaphragm. This segmentation allows each surface to be independently controlled to prevent uneven elongation, resolving the contradiction between manufacturing simplicity and sound quality stability.
Solution Approach 2:
Different regions of the diaphragm (upper and lower surfaces) are equipped with voice coils tailored to their specific requirements. The upper surface voice coil and lower surface voice coil can have different designs optimized for their respective positions, ensuring uniform elongation characteristics while maintaining manufacturing feasibility.
2Volume of moving object
If the speaker is designed to be compact and thin, then it meets modern TV housing requirements, but the magnetic gap space is limited making it difficult to achieve high sound quality
Solution Approach 1:
The voice coil configuration transitions from a single-surface design to a dual-surface design, utilizing the third dimension (depth/thickness) of the diaphragm. This allows the magnetic circuit to be optimized for compactness while the dual voice coil arrangement maintains sound quality by ensuring uniform elongation control.
Solution Approach 2:
The upper and lower voice coils are electrically connected in series or parallel to function as a unified electromagnetic system. This merging allows the compact speaker structure to achieve high sound quality by combining the effects of both voice coils, which compensate for each other's elongation differences.
3Strength
If the voice coil is positioned inside the inner circumference of the edge, then adhesion between the edge and diaphragm is improved, but the magnetic flux utilization is reduced
Solution Approach 1:
The voice coil is divided into two segments positioned on opposite surfaces of the diaphragm. The upper voice coil can be positioned inside the inner circumference for strong adhesion, while the lower voice coil can be positioned to optimize magnetic flux utilization, thereby resolving the contradiction between adhesion strength and power output.
Solution Approach 2:
The upper and lower voice coils are positioned asymmetrically relative to the edge and magnetic gap. This asymmetric positioning allows each voice coil to optimize for its specific function: one prioritizes adhesion while the other prioritizes magnetic flux utilization, achieving both goals simultaneously.
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 solution effectively prevents deformation and adhesion failures, enhances sound quality by optimizing the voice coil placement and magnetic circuit configuration, resulting in a high-efficiency speaker with reduced distortion and improved sound reproduction.
Implementation Method 1
a driving force is generated, in a vertical direction, by a motive current and magnetic flux within the magnetic gap 95
Data Source
AI summary
The speaker according to the present invention comprises: a magnetic circuit; a diaphragm, a part of which is located in a magnetic gap formed in the magnetic circuit; a ring-shaped first voice coil formed on a first vibrating surface of the diaphragm; a ring-shaped second voice coil which is formed on a second vibrating surface of the diaphragm, the second vibrating surface being an opposite surface to the first vibrating surface, and which is electrically conducted with the first voice coil; and an edge firmly fixed on an outer margin of the first vibrating surface and operable to support the diaphragm in such a manner that enables vibration. The first voice coil is formed so as to be located inside of an inner circumference of the edge and also within the magnetic gap. The second voice coil is formed so as to have at least a part of an outermost circumference thereof is located outside of the inner circumference of the edge and within the magnetic gap.