Composite Speaker Diaphragm Assembly for High-Frequency Stability
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Solution Overview
Problem
Conventional speakers and micro speakers fail to meet requirements for high frequency extension beyond 20 kHz due to inadequate energy transfer from the diaphragm body to the dome body and insufficient rigidity of the dome body, leading to wobble and splitting vibrations.
Innovation Solution
A diaphragm assembly with a diaphragm body comprising an outer connection portion, inner diaphragm portion, and folding ring portion, where the inner diaphragm portion has a center opening and is attached to the dome body at its peripheral portion, and the dome body features a lamination structure of multiple metal and foam layers for enhanced strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the dome body is made thinner to reduce weight and size, then the speaker becomes more compact, but the dome body lacks sufficient rigidity and exhibits wobble and splitting vibrations at high frequencies
Solution Approach 1:
The dome body is constructed as a composite structure combining a foam substrate with multiple metal foil layers (aluminum, copper, silver) laminated thereon. This composite design provides both the required rigidity to prevent wobble and splitting vibrations at high frequencies and the thin profile needed for compact speaker design. The foam substrate provides structural support while the metal layers add stiffness and durability.
Solution Approach 2:
The dome body is divided into multiple thin metal foil layers that are laminated together, rather than using a single thick material. This segmentation allows the structure to maintain high frequency rigidity while keeping individual layers thin, contributing to overall compactness. The folded ring structure further segments the dome body into functional zones with different mechanical properties.
2Stability of the object's composition
If the inner diaphragm portion is fully attached to the dome body, then structural stability is improved, but energy transfer from the diaphragm body to the dome body is slowed, limiting high frequency extension
Solution Approach 1:
The attachment between the inner diaphragm portion and dome body is designed with spatially varying characteristics. The center opening is provided to reduce attachment area and improve energy transfer speed, while the peripheral portion maintains sufficient attachment for structural stability. This local differentiation allows simultaneous optimization of both energy transfer and structural integrity.
Solution Approach 2:
The center opening extracts or removes material from the inner diaphragm portion, creating a non-full attachment configuration. This extraction reduces the attachment area between the diaphragm body and dome body, thereby improving energy transfer speed for high frequency performance while the peripheral attachment maintains necessary structural stability.
3Measurement precision
If the speaker operates at higher frequencies beyond 20 kHz, then high frequency extension is achieved, but the dome body experiences increased wobble and splitting vibrations
Solution Approach 1:
The multi-layer composite dome body structure provides the high frequency stability needed for operation beyond 20 kHz. The combination of foam substrate and multiple metal foil layers creates a rigid structure that resists wobble and splitting vibrations at high frequencies, enabling extended frequency response while maintaining vibration stability.
Solution Approach 2:
The folded ring structure segments the dome body into distinct functional zones, with the folded portions providing rigid support against high frequency vibrations. This segmentation allows different regions of the dome body to perform specialized functions, with the folded rings preventing wobble while the central area maintains flexibility for sound production.
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
Facilitates high frequency performance exceeding 20 kHz by rapid energy transfer and improved dome body strength, reducing wobble and splitting vibrations.
Implementation Method 1
the dome body features a lamination structure of multiple metal and foam layers for enhanced strength
Implementation Method 2
Facilitates high frequency performance exceeding 20 kHz by rapid energy transfer
Data Source
AI summary
A diaphragm assembly, speaker and portable electronic device are provided. The diaphragm assembly includes a diaphragm body and a dome body. The diaphragm body includes an outer connection portion, an inner diaphragm portion and a folding ring portion which is between and is connected to the outer connection portion and the inner diaphragm portion. The dome body is attached to the inner diaphragm portion of the diaphragm body. The inner diaphragm portion has a center opening so that the inner diaphragm portion is attached to the dome body at a peripheral portion of the dome body.