Thin Loudspeaker Using Planar Coils on Laminated Substrates
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Solution Overview
Problem
Existing loudspeakers, such as piezoelectric, electrostatic, and dynamic types, face issues like large distortion, inefficient sound production, high manufacturing costs, and size constraints due to complex structures and requirements for external amplifiers and bulky components.
Innovation Solution
A thin loudspeaker design featuring a magnet and a coil diaphragm with interconnected planar coils on laminated substrates, a resonance box, and a flexible membrane, which simplifies the structure and allows for efficient sound production without the need for external amplifiers, using a strong magnet and flexible circuit board for improved vibration and sound output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If piezoelectric loudspeakers use a thin diaphragm to reduce size, then the structure becomes thinner, but additional configurations are required for driving circuits and conductive structures, increasing complexity
Solution Approach 1:
The patent combines the driving circuit, conductive structure, and thin diaphragm into a single integrated flexible circuit board. The flexible circuit board serves multiple functions simultaneously: it provides the thin diaphragm structure, contains the driving circuit traces, and forms the conductive structure for the piezoelectric element, thereby reducing overall complexity despite the thin profile
Solution Approach 2:
The flexible circuit board performs multiple functions: it acts as the diaphragm structure, carries the driving circuit, provides the conductive path for the piezoelectric element, and serves as the mechanical support structure. This multi-functionality reduces the need for separate components and simplifies the overall design
2Measurement precision
If piezoelectric loudspeakers use a thin diaphragm to achieve high-frequency performance, then high-frequency response improves, but low-frequency performance deteriorates with high distortion
Solution Approach 1:
The patent uses a composite structure consisting of the flexible circuit board material combined with the piezoelectric element. This composite construction allows the thin diaphragm to maintain its high-frequency responsiveness while the piezoelectric material provides the necessary mechanical coupling and vibration generation, improving low-frequency performance and reducing distortion through the synergistic interaction of the two materials
3Force
If dynamic loudspeakers use large magnets and long coils to generate sufficient force, then sound production force improves, but size and weight increase
Solution Approach 1:
The patent replaces the traditional dynamic speaker mechanism of large magnets and long coils with a piezoelectric-based system. The piezoelectric element converts electrical signals directly into mechanical vibrations through electro-mechanical coupling, eliminating the need for bulky magnetic components and long coil windings, thereby significantly reducing weight while maintaining adequate sound production force
4Power
If electrostatic speakers use a large diaphragm area to improve sound production, then sound output improves, but distortion increases and dust absorption increases
Solution Approach 1:
The patent applies local quality by concentrating the piezoelectric element at specific locations on the flexible circuit board rather than distributing it uniformly across the entire diaphragm surface. This localized placement allows the thin diaphragm to vibrate effectively with smaller area, reducing distortion while the piezoelectric material's inherent properties provide sufficient sound output without requiring large surface areas that would attract dust
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 design results in a lightweight, low-cost, and efficient sound production capable of producing higher sound power with reduced distortion across various frequency ranges, while minimizing size and manufacturing complexity.
Implementation Method 1
The reasons that piezoelectric loudspeakers could produce sound are piezoelectric material can be deformed to push vibration diaphragms
Implementation Method 2
A thin loudspeaker design featuring a magnet and a coil diaphragm with interconnected planar coils on laminated substrates
Data Source
AI summary
A thin loudspeaker is provided. The thin loudspeaker includes a small magnet and a thin coil diaphragm. The coil diaphragm has a plurality of planar coils and a membrane. The membrane has a plurality of laminated substrates. The planar coils are interconnected, stacked, and respectively formed on the substrates. The magnet is disposed to contact the underside of the coil diaphragm along the common central axis of the planar coils.