Linear Actuator Array Phase Control for Directional Haptics
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Solution Overview
Problem
Existing vibration devices lack the ability to define the directionality of vibratory forces, making it difficult to provide haptic sensations that correspond to directional cues, especially in applications where visual cues are absent.
Innovation Solution
The use of synchronized arrays of vibration actuators in a network topology (SAVANT) architecture, which allows for the generation of asymmetric and directional haptic cues by controlling the phase and amplitude of vibration waveforms across multiple actuators.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single vibration actuator is used, then the device complexity is reduced, but the ability to generate directional haptic cues is lost
Solution Approach 1:
The system divides a single vibration actuator into multiple independent vibration elements (first and second vibration elements) that can be controlled separately. This segmentation allows each element to contribute to different aspects of the vibration waveform, enabling directional haptic cues while maintaining a relatively simple overall device structure.
Solution Approach 2:
The system dynamically adjusts the phase and amplitude of each vibration element based on the desired waveform characteristics. By varying the phase difference between the first and second vibration elements, the system can generate different directional haptic cues adaptively, making the device versatile without requiring complex mechanical reconfiguration.
2Adaptability or versatility
If multiple vibration actuators are used with independent control, then directional haptic cues can be generated, but the device complexity increases
Solution Approach 1:
The system merges the control of multiple vibration elements under a unified control mechanism that adjusts phase and amplitude based on a single target waveform specification. This combining approach allows directional haptic cues to be generated through coordinated vibration of multiple elements without requiring entirely separate control systems for each element, thereby managing complexity.
Solution Approach 2:
The system controls the vibration characteristics by changing parameters (phase and amplitude) of existing vibration elements rather than adding complex mechanical structures. By adjusting these parameters dynamically, the system achieves versatile directional haptic cue generation while keeping the physical device structure relatively simple.
3Adaptability or versatility
If asymmetric vibration waveforms are generated, then directional haptic sensations are improved, but the power consumption increases
Solution Approach 1:
The system generates asymmetric vibration waveforms through periodic modulation of the phase and amplitude of vibration elements. By using periodic action rather than continuous asymmetric vibration, the system can create directional haptic sensations while allowing power consumption to be managed through controlled vibration cycles and duty cycles.
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
This approach enables the creation of human-perceptible directional haptic sensations, improving the controllability and power efficiency of vibration devices while allowing for a wide range of vibration waveforms, including directional and non-directional ones.
Implementation Method 1
Each actuator in the array is a linear resonant actuator (LRA)
Implementation Method 2
Each actuator in the array is a linear resonant actuator (LRA)
Data Source
AI summary
The present disclosure provides a multi-actuator haptic feedback device comprising an array of linear resonant actuators (LRAs) arranged in multiple directions to produce advanced haptic effects through coherent phase control. The device utilizes phase switching and phase modulation techniques with specific timing to control haptic outputs in multiple spatial directions. Methods are disclosed for optimizing energy consumption by storing energy in the mechanical inertia of the LRAs and efficiently releasing it during haptic events. Additionally, techniques for concealing internal state transitions using a spinning reserve mode are provided, enhancing user experience by preventing undesired haptic sensations during transitions. Applications include touchpads, touchscreens, mobile phones, game controllers, wearable devices, and automotive interior touch surfaces.