Curved-Surface Loudspeaker for AR Headset Sound Directivity
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Solution Overview
Problem
Current head-mounted devices, such as AR and VR headpieces, face issues with poor sound receiving privacy and user experience due to inadequate sound immersion and discomfort, especially in non-alone or outdoor applications.
Innovation Solution
A loudspeaker with a curved-surface extension structure that radiates sound into a predetermined directivity range, combined with a micro-controlling unit that utilizes Head Related Transfer Function (HRTF) to compensate sound signals and optimize loudspeaker placement for improved directivity and privacy protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If earplug systems are used, then compact size and leak proofness are achieved, but three-dimensional sound effect is poor
Solution Approach 1:
The patent employs a curved-surface extension structure that extends from the vibrating diaphragm to control sound radiation. This curved surface redirects sound waves to achieve predetermined directivity patterns, enabling three-dimensional sound effects while maintaining the compact earplug form factor.
2Reliability
If earmuff systems are used, then three-dimensional sound effect is improved, but appearance becomes cumbersome and comfort deteriorates
Solution Approach 1:
The curved-surface extension structure is integrated within the earplug housing, nesting the sound direction control mechanism inside the compact earplug form. This eliminates the need for external earmuff structures while achieving three-dimensional sound effects and maintaining comfort.
3Ease of operation
If bone conduction devices are used, then ears are freed, but sound performance is poor and immersion feeling is inadequate
Solution Approach 1:
The curved-surface extension structure acts as an intermediary between the vibrating diaphragm and the external environment, controlling sound wave propagation to achieve predetermined directivity. This enables the earplug to provide immersive sound performance while keeping the ears physically free like bone conduction devices.
4Ease of operation
If traditional externally playing loudspeakers are used, then ears are freed, but privacy protection is insufficient
Solution Approach 1:
The curved-surface extension structure creates localized sound radiation patterns with predetermined directivity, concentrating sound energy in specific directions. This provides privacy protection by limiting sound leakage to designated areas while maintaining ear freedom comparable to external loudspeakers.
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 solution provides enhanced sound privacy, improved user experience, and comfortable wear, while maintaining good sound immersion, outperforming conventional earplug, earmuff, and bone conduction systems.
Implementation Method 1
a magnetic circuit unit that is provided within the housing and is for generating a magnetic force, a voice coil that vibrates by the magnetic force
Implementation Method 2
a vibrating diaphragm that in response to the vibration of the voice coil vibrates and generates a sound; the sound generated by the vibrating diaphragm radiates into a predetermined directivity range via the curved-surface extension structure
Data Source
AI summary
The present disclosure discloses a loudspeaker and a method for improving directivity of a sound of a loudspeaker, a head-mounted device and a method for improving a sound effect of a head-mounted device. The loudspeaker comprises: a housing, a magnetic circuit unit that is provided within the housing and is for generating a magnetic force, a voice coil that vibrates by the magnetic force, and a vibrating diaphragm that in response to the vibration of the voice coil vibrates and generates a sound; wherein the loudspeaker further comprises a curved-surface extension structure; the curved-surface extension structure connects to the vibrating diaphragm, and radiating the sound generated by the vibrating diaphragm into a predetermined directivity range.