Air-Pulse Generating Device Flap Mechanism for Compact High Sound Pressure
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Solution Overview
Problem
Conventional speakers face challenges in producing high sound pressure levels across the entire audio frequency band due to the need for large radiating surfaces and enclosures, making it difficult to design small, efficient sound-producing devices.
Innovation Solution
The air-pulse generating device employs a modulating and demodulating mechanism using flap pairs driven by specific signals to produce ultrasonic air pressure waves, which are then demodulated to generate air pulses with high sound pressure levels, achieving efficient sound production in a compact form.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional speakers use large radiating surfaces and enclosures to cover entire audio frequency band, then sound pressure level and fidelity are improved, but device size increases
Solution Approach 1:
The audio frequency band is segmented into different ranges, with each segment handled by a specialized transducer type. The patent uses ultrasonic transducers for high-frequency components and electromagnetic transducers for low-frequency components, allowing the system to achieve full audio frequency coverage without requiring a single large radiating surface. This segmentation enables compact device design while maintaining comprehensive frequency response.
Solution Approach 2:
The patent introduces an intermediary air-pulse generation mechanism that bridges the ultrasonic transducer and the acoustic output. The air-pulse generating device converts ultrasonic vibrations into audible sound through a series of air compression and rarefaction cycles, acting as a mediator that enables efficient energy transfer from the ultrasonic source to the audible output without requiring direct mechanical coupling or large radiating surfaces.
2Reliability
If conventional speakers use large enclosures to produce high sound pressure level, then sound fidelity is improved, but power consumption increases
Solution Approach 1:
The patent employs periodic action through the air-pulse generating device, which operates in cyclic modes of compression and rarefaction. The ultrasonic transducer creates periodic pressure variations in the air, which are then systematically expanded into audible sound pulses. This periodic mechanism allows efficient energy utilization by synchronizing the transducer operation with the acoustic output requirements, reducing wasted energy that would occur in conventional continuous operation systems.
Solution Approach 2:
The patent utilizes parameter changes by transitioning from ultrasonic frequency parameters to audible frequency parameters through the air-pulse generation process. The system changes the frequency parameter from ultrasonic (above human hearing range) to audible frequencies, and simultaneously adjusts the pressure and volume parameters to optimize energy efficiency. This parameter transformation enables high sound pressure level output with reduced power consumption compared to conventional speakers.
3Reliability
If conventional speakers use large radiating surfaces to cover entire audio frequency band, then sound fidelity is improved, but device complexity increases
Solution Approach 1:
The air-pulse generating device serves multiple functions within the system: it acts as a frequency converter, a pressure amplifier, and an acoustic coupler. By making this single component multi-functional, the patent reduces the need for separate dedicated components for each function, thereby simplifying the overall device architecture while maintaining high sound fidelity across the entire audio frequency band.
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 device achieves high sound pressure levels while consuming low power, effectively addressing the size and efficiency limitations of conventional speakers by producing asymmetric air pulses that enhance sound reproduction.
Implementation Method 1
a film structure (10) configured to be driven by drive signals to generate an ultrasonic air pressure wave
Implementation Method 2
the film structure (10) is driven by drive signals to generate an ultrasonic air pressure wave with an ultrasonic carrier frequency
Implementation Method 3
a first flap (1031) and a second flap (1012) configured to perform a first differential movement to form a first opening (1121)
Data Source
AI summary
An air-pulse generating device includes first and second cells. The first cell includes first flap and second flaps configured to perform a first differential movement to form a first opening. The second cell includes third and fourth flaps configured to perform a second differential movement to form a second opening. The first flap and the second flap are opposite to each other and actuated to move toward opposite directions to perform the first differential movement. The third flap and the fourth flap are opposite to each other and actuated to move toward opposite directions to perform the second differential movement. The second flap of the first cell and the third flap of the second cell are actuated to move toward opposite directions and disposed adjacent to each other.