Force-Canceling Speaker Suspension for XR Shaking Isolation
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Solution Overview
Problem
Speakers mounted on wearable devices like XR headsets cause unwanted shaking and audio leakage, contaminating IMU signals and compromising privacy, particularly in devices designed for better bass performance.
Innovation Solution
A speaker system with a single driver and a non-rigid suspension that decouples the basket from the fixed structure, using a secondary suspension to mitigate transmitted forces and moments, achieving both force and moment cancellation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If speakers are mounted on wearable devices with better bass performance, then audio quality is improved, but shaking and audio leakage increase
Solution Approach 1:
The speaker system is divided into two separate moving masses: the first moving mass (diaphragm, voice coil, surround) that generates sound, and the second moving mass (magnet core, motor, basket) that generates force. By segmenting these functions, the patent eliminates the coupling between force generation and sound radiation that causes shaking and leakage in conventional single-mass speakers.
Solution Approach 2:
The harmful force-generating components (magnet core, motor assembly, basket) are extracted from the sound-radiating structure. The second moving mass is suspended independently from the fixed frame via secondary suspension, separating the force generation function from the sound radiation function, thereby eliminating the transmission of shaking forces to the wearable device frame.
2Power
If speakers are mounted on wearable devices, then audio output is achieved, but IMU signals are contaminated
Solution Approach 1:
The force-generating motor assembly and basket are extracted from the fixed frame structure and suspended as a separate second moving mass. This extraction prevents the transmission of motor forces and vibrations to the frame and IMU sensors, eliminating signal contamination while preserving audio output functionality.
Solution Approach 2:
The secondary suspension acts as an intermediary element between the second moving mass (force generator) and the fixed frame. This intermediary decouples the force-generating components from the frame structure, allowing audio power output while preventing vibration transmission to IMU sensors.
3Ease of operation
If speakers are mounted on wearable devices, then audio functionality is provided, but privacy is compromised due to audio leakage
Solution Approach 1:
The basket and motor assembly are extracted from the fixed frame and suspended as a separate moving mass. This extraction creates isolation between the audio generation components and the device frame, preventing audio leakage while maintaining full audio functionality.
Solution Approach 2:
The second moving mass (basket, motor, core) acts as a counterweight that moves in opposition to the first moving mass. This counter-movement cancels out the forces that would otherwise cause the basket to radiate sound outward, reducing audio leakage while preserving the audio functionality of the first moving mass.
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
Substantially reduces shaking and audio leakage, maintaining IMU accuracy and privacy by canceling contamination signals, while maintaining efficient packaging and reducing weight.
Implementation Method 1
A non-rigid secondary suspension can be coupled between the suspended basket and a fixed frame... The secondary suspension can reduce shaking and contamination generated by the magnet core/motor assembly from seeping into the frame
Implementation Method 2
The first moving mass can include a diaphragm, a voice coil, and a diaphragm surround... The second moving mass or driver, can include a steel/magnet/core/motor
Data Source
AI summary
Aspects of the present disclosure are directed to a speaker system that uses a single driver that results in both force and moment canceling. The speaker system can be mounted within a structure, such as a head mounted display. The speaker system includes a first moving mass, including a sound-producing diaphragm, connected by a primary suspension to a floating basket. The floating basket is both coupled to a second moving mass that controls a voice coil, inducing voice coil movement to produce sound via the diaphragm. A secondary suspension can couple the suspended basket and a fixed frame. The secondary suspension can reduce shaking and contamination generated by the magnet core/motor assembly from seeping into the fixed frame and subsequently to other connected components.