Shared Magnetic Circuit Haptic Feedback for AR/VR Glasses
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Solution Overview
Problem
Existing AR/VR products rely solely on sound signals for reminders, which fail to meet user requirements for diverse feedback needs.
Innovation Solution
A multi-functional feedback device incorporating a vibration unit and a touch unit, both sharing a magnetic circuit unit, to produce sound and haptic feedback, with separate or common power amplifiers, integrated into AR/VR glasses for enhanced feedback capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If separate speakers and haptic motors are used for sound and vibration feedback, then feedback functionality is complete, but device complexity and space occupation increase
Solution Approach 1:
The patent combines a speaker and haptic motor into a single integrated unit where the voice coil assembly serves both acoustic and haptic functions. The magnetic circuit unit generates magnetic fields that drive the diaphragm for sound production while simultaneously driving the touch material for haptic feedback, eliminating the need for separate speakers and haptic motors.
Solution Approach 2:
The voice coil assembly is designed as a multi-functional component that performs both sound output and haptic feedback functions. The magnetic circuit unit and voice coil work together to produce both acoustic waves through the diaphragm and tactile vibrations through the touch material, allowing one component to fulfill multiple roles.
2Adaptability or versatility
If separate speakers and haptic motors are used, then feedback functionality is complete, but cost increases
Solution Approach 1:
The patent merges the speaker and haptic motor into a single integrated assembly, reducing the total component count and associated manufacturing costs. By using a shared magnetic circuit unit and voice coil assembly, the design eliminates redundant components and simplifies the manufacturing process.
Solution Approach 2:
The multi-functional voice coil assembly reduces overall system cost by having one component perform the work of two separate components. The magnetic circuit unit and voice coil are designed to serve both acoustic and haptic functions, reducing bill of materials costs and assembly complexity.
3Device complexity
If a magnetic circuit unit drives both vibration and touch units, then space is saved, but magnetic field interference may occur
Solution Approach 1:
The patent segments the magnetic circuit into separate pole plates (first pole plate for vibration unit, second pole plate for touch unit) with distinct magnetic poles. This spatial segmentation of magnetic fields ensures that each unit receives the appropriate magnetic polarity for its function while minimizing interference between the two units.
Solution Approach 2:
The magnetic circuit unit is designed with different pole configurations for different regions: the first pole plate has magnetic poles oriented for driving the vibration unit, while the second pole plate has poles oriented for driving the touch unit. This localized magnetic field distribution ensures optimal performance for each function while reducing cross-interference.
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 multi-functional feedback, saving costs and space while providing effective sound and vibration reminders, meeting diverse user requirements.
Implementation Method 1
a voice coil connected to the dome and inserted in the magnetic gap
Implementation Method 2
a magnetic circuit unit fixed in the frame, a vibration unit connected to the frame and driven by the magnetic circuit unit to produce sound
Implementation Method 3
a driving part arranged apart from the magnetic circuit unit and driven by the magnetic circuit unit to vibrate along the thickness direction
Implementation Method 4
The touch unit includes a driving part arranged apart from the magnetic circuit unit and driven by the magnetic circuit unit to vibrate
Implementation Method 5
a first elastic member connected to the driving part and fixed to the frame
Data Source
AI summary
A multi-functional feedback device, a haptic feedback system, and augmented reality (AR)/virtual reality (VR) glasses are provided. In the multi-functional feedback device, a vibration unit and a touch unit are assembled in a housing and share a magnetic circuit unit, which not only realizes transmission of a sound signal, but also realizes haptic feedback through a vibration signal, achieving a multi-functional feedback effect. Due to sharing a same magnetic circuit unit, costs can be saved, and an occupied space can be saved. The haptic feedback system includes the multi-functional feedback device. The vibration unit and the touch unit can be separate power amplifiers or a common power amplifier. In the AR/VR glasses, the haptic feedback system is assembled in a glasses frame, which can realize a reminder through vibration or sound on a head when used by a user, so as to meet diverse requirements.