Vehicle Speaker Enclosure Layout for Higher SPL and Stereo Sound
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Solution Overview
Problem
Existing sound apparatuses in vehicles face limitations in producing realistic or stereo sounds due to the constraints of coil-type devices, particularly in terms of sound pressure level and the inability to increase the number of speakers effectively.
Innovation Solution
A sound apparatus comprising an enclosure with a sound generating module that includes a vibration member and a vibration apparatus, designed to enhance sound characteristics and sound pressure level by optimizing the enclosure's design, including a heat dissipation part and strategically configured holes, to improve sound output across various frequency bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If coil-type speakers are used in vehicles, then the sound apparatus can be implemented with conventional technology, but the sound pressure level and realistic sound quality are limited
Solution Approach 1:
The patent replaces the conventional coil-type electromagnetic actuator with a piezoelectric actuator that utilizes piezoelectric effect (mechanical strain from electrical field) to drive the diaphragm. This substitution enables higher sound pressure levels and improved sound quality by generating stronger mechanical vibrations from the same electrical input, directly resolving the limitation of coil-type devices in producing realistic sounds.
Solution Approach 2:
The patent changes the fundamental operating parameters of the sound apparatus by adopting piezoelectric materials with high coupling coefficients, enabling the diaphragm to achieve greater displacement and vibration amplitude. This parameter change allows the system to overcome the inherent limitations of coil-type speakers in terms of sound pressure level and frequency response, particularly in the low-pitched sound band.
2Reliability
If the number of speakers is increased to achieve stereo sound, then sound quality can be improved, but the space available in vehicles limits the number of speakers
Solution Approach 1:
The patent makes each speaker unit multi-functional by incorporating both high-fidelity sound reproduction and stereo imaging capabilities into a single device. The piezoelectric actuator's ability to precisely control diaphragm movement across wide frequency ranges allows one speaker to perform the function of multiple traditional speakers, enabling stereo sound without requiring additional speaker units and thus preserving vehicle interior space.
Solution Approach 2:
By changing the actuation mechanism to piezoelectric, each speaker achieves extended frequency response and enhanced sound pressure level, allowing a single speaker to cover audio ranges that previously required multiple specialized drivers. This parameter enhancement enables compact speaker configurations that still deliver full stereo sound quality.
3Power
If piezoelectric vibration apparatus is used, then sound characteristic and sound pressure level can be enhanced, but heat generation may reduce performance
Solution Approach 1:
The patent introduces a heat dissipation structure as an intermediary between the piezoelectric actuator and the surrounding environment. This structure facilitates efficient thermal conduction from the piezoelectric element, preventing heat accumulation that would otherwise degrade performance. The heat dissipation intermediary maintains the piezoelectric material's operational temperature range, ensuring sustained high sound pressure level output.
Solution Approach 2:
The patent extracts heat from the piezoelectric actuator through dedicated thermal management structures, separating the thermal management function from the acoustic generation function. This extraction of harmful thermal energy allows the piezoelectric element to operate at optimal temperatures, maintaining high efficiency and performance without degradation from self-generated heat.
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 proposed sound apparatus effectively enhances sound characteristics and sound pressure levels, particularly in low-pitched sound bands, while maintaining a balanced sound pressure level and flatness characteristic, thereby providing a more immersive audio experience in vehicles.
Implementation Method 1
a vibration apparatus connected to the enclosure to vibrate the vibration member
Implementation Method 2
a heat dissipation part configured at an enclosure, thereby preventing a reduction in performance of a vibration apparatus caused by heat
Data Source
AI summary
A sound apparatus and a vehicular apparatus including the sound apparatus are discussed. The sound apparatus can include an enclosure including an internal space and an opening part connected to the internal space, and a sound generating module at the internal space of the enclosure. The sound generating module can include a vibration member at the enclosure and a vibration apparatus connected to the enclosure to vibrate the vibration member.