Ultrasonic Loudspeaker With FPC-Coupled Dual Drivers
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Solution Overview
Problem
Existing loudspeakers, particularly those with piezoelectric drivers, suffer from inadequate high-frequency response and poor sound pressure coupling, leading to suboptimal audio restoration.
Innovation Solution
An ultrasonic loudspeaker design incorporating a magnetic circuit system, a frame, a flexible printed circuit (FPC) with a voice coil and ultrasonic driver attached to a diaphragm, where the voice coil and ultrasonic driver vibrations are transmitted through the FPC to enhance frequency response, utilizing a piezoelectric plate with converted vibration mode and a reinforcement plate for improved sound pressure coupling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a piezoelectric driver is added near the loudspeaker to improve high-frequency response, then the high-frequency response is enhanced, but the coupling effect between the piezoelectric driver and loudspeaker becomes poor, making it impossible to precisely restore high-resolution sound source
Solution Approach 1:
The patent merges the voice coil driver and ultrasonic piezoelectric driver into a single integrated assembly where both drivers are mounted on the same diaphragm structure. The voice coil assembly and piezoelectric assembly share a common magnetic circuit system and diaphragm, creating a unified driving system that improves coupling efficiency and enables precise restoration of high-resolution sound sources through coordinated operation of both drivers
Solution Approach 2:
The diaphragm structure serves multiple functions simultaneously: it acts as the vibration membrane for the voice coil driver, the vibration membrane for the ultrasonic piezoelectric driver, and the structural support for both driver assemblies. This multi-functional design improves coupling between drivers while maintaining high-frequency response enhancement
2Illumination intensity
If the voice coil and ultrasonic driver are both fixed to the FPC which is attached to the diaphragm, then the sound pressures from both drivers are better coupled to form ultrasonic grade frequency response, but the structural complexity increases
Solution Approach 1:
The FPC (flexible printed circuit) serves multiple functions: it provides mechanical support for mounting both the voice coil and ultrasonic driver, acts as a vibration transmission structure attached to the diaphragm, and serves as the electrical connection pathway for both drivers. This multi-functionality reduces the need for separate mounting structures and simplifies the overall assembly process despite the integrated design
Solution Approach 2:
The patent uses a flexible printed circuit board as the mounting structure for both drivers. The FPC's flexibility allows it to conform to the diaphragm structure while providing rigid mounting points for the drivers. This thin-film approach reduces structural complexity compared to traditional rigid mounting structures while maintaining effective coupling between the drivers and 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 design achieves higher-resolution audio by combining sound pressures from the voice coil and ultrasonic driver, providing enhanced frequency response up to 40 KHz with improved sound quality and reduced deformation.
Implementation Method 1
the voice coil, when energized, drives the diaphragm to vibrate by means of the FPC to produce a first sound pressure
Implementation Method 2
the ultrasonic driver is energized to drive the diaphragm to produce a second sound pressure
Data Source
AI summary
The present invention relates to the technical field of electroacoustics, and in particular to an ultrasonic loudspeaker comprising: a magnetic circuit system for providing the loudspeaker with a magnetic field; a frame provided in a hollow way, the magnetic circuit system being fixed in the frame; an FPC lapped and fixed on the frame, a portion of the FPC in a hollow portion of the frame being elastic; a diaphragm attached and fixed to the FPC in parallel; a voice coil with a top fixed to the FPC and a remaining portion extending into the hollow portion of the frame; and an ultrasonic driver fixed to the FPC and attached and connected to the diaphragm. When powered, the voice coil drives the diaphragm via the FPC to generate first sound pressure while the ultrasonic driver produces second sound pressure, their combination forming ultrasonic grade frequency response for high-resolution audio reproduction.