Single-Plate Loudspeaker Vibratable Element Reducing Abnormal Vibration
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Solution Overview
Problem
Conventional vibratable elements for loudspeakers require a larger number of components, which can lead to increased complexity and the possibility of abnormal vibrations such as the rolling/rocking phenomenon due to matching resonance frequencies between different parts.
Innovation Solution
A vibratable element structured with a single thin plate serving as the main body, including a fixing portion, damper portion, vibrating portion, and edge portion, where the first and second curved portions have different spring constants and non-matching resonance frequencies, reducing the likelihood of abnormal vibrations by maintaining overall on-center holding force and allowing reciprocating movement of the coil bobbin and voice coil.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a conventional multi-component structure (skin material attached to core material) is used, then the structural integrity is maintained, but the number of components increases and complexity increases
Solution Approach 1:
The patent merges the skin material and core material into a single integrated diaphragm component. The diaphragm is formed as one piece with a first region (peripheral portion) and a second region (central portion) that are structurally integrated but functionally differentiated, eliminating the need for separate skin and core materials that were previously attached together.
Solution Approach 2:
The patent segments the diaphragm into functionally distinct regions (first region and second region) within a single component. The first region has different physical properties than the second region, allowing each region to perform its specific function while maintaining structural integration and reducing component count.
2Reliability
If the resonance frequencies of different portions match, then the structural symmetry is maintained, but abnormal vibrations such as rolling/rocking phenomenon occur
Solution Approach 1:
The patent introduces asymmetry in the resonance frequencies of different diaphragm regions. The first region and second region are designed to have different resonance frequencies, which prevents the rolling/rocking phenomenon that occurs when resonance frequencies match, while still maintaining the overall symmetry and balanced vibration of the diaphragm.
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 reduces the number of components, minimizes the rolling/rocking phenomenon, and enhances vibration symmetry and sound quality by ensuring the vibratable element vibrates primarily in the intended direction with improved on-center holding force and reduced movement in orthogonal directions.
Implementation Method 1
The first and second curved portions have different spring constants from each other, or alternatively may have a substantially matched vibration system weight. In the vibratable element of this aspect, the first and second curved portions have non-matching resonance frequencies when the vibratable element vibrates.
Data Source
Figure 1A~1B
Figure 2A~2B
Figure 3A
AI summary
The invention provides a vibratable element for loudspeaker use and a loudspeaker device having a reduced number of components. A vibratable element for loudspeaker use 100 includes a coil bobbin 120, a voice coil 130 attached to the coil bobbin 120, and a main body 110 constituted by a single thin plate. The main body 110 includes a fixing portion 112, a damper portion 111, an edge portion 114, and a vibrating portion 113. The fixing portion 112 is a part of the thin plate to which the coil bobbin 120 is fixed from the Z'-direction side. The damper portion 111 is a part of the thin plate located inside the fixing portion 112. The vibrating portion 113 is a part of the thin plate located outside the fixing portion 112. The inside refers to a side toward the center of the thin plate, and the outside refers to a side away from the center of the thin plate. The edge portion 114 is a part of the thin plate outside the vibrating portion 113 and includes an outer perimeter portion of the thin plate.