Haptic Pen Waveform Control for Resonant Low-Power Vibration
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Solution Overview
Problem
Current haptic pens require excessive power for operation, leading to short continuous operation times due to the high power demands of haptic elements like LRA motors.
Innovation Solution
A haptic pen with a memory storing a reproduced waveform that includes resonant frequency periods and transition periods, where large amplitude periods are replaced with sine waves at the resonant frequency of the haptic element, reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the amplitude of the reproduced waveform is increased to achieve strong vibration, then the vibration intensity is improved, but the power consumption increases and continuous operation time decreases
Solution Approach 1:
The patent utilizes resonance vibration by setting the waveform frequency to match the natural resonant frequency of the haptic element. This allows the haptic element to achieve maximum vibration intensity with minimal input energy, as the resonant frequency naturally amplifies the vibration response. The control unit generates waveforms specifically tuned to the resonant frequency of the LRA motor, enabling strong vibration without increasing power consumption.
Solution Approach 2:
The patent changes the frequency parameter of the reproduced waveform to match the resonant frequency of the haptic element. By adjusting this critical parameter, the system achieves optimal energy efficiency where the haptic element responds with maximum vibration amplitude for minimum power input. The control unit dynamically sets the waveform frequency based on the detected resonant frequency of the haptic element.
2Strength
If the amplitude of the reproduced waveform is increased to achieve strong vibration, then the vibration intensity is improved, but the continuous operation time decreases
Solution Approach 1:
The patent utilizes resonance vibration by setting the waveform frequency to match the natural resonant frequency of the haptic element. This allows the haptic element to achieve maximum vibration intensity with minimal input energy, as the resonant frequency naturally amplifies the vibration response. The control unit generates waveforms specifically tuned to the resonant frequency of the LRA motor, enabling strong vibration without increasing power consumption.
Solution Approach 2:
The patent changes the frequency parameter of the reproduced waveform to match the resonant frequency of the haptic element. By adjusting this critical parameter, the system achieves optimal energy efficiency where the haptic element responds with maximum vibration amplitude for minimum power input. The control unit dynamically sets the waveform frequency based on the detected resonant frequency of the haptic element.
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 maintains strong vibration intensity while significantly extending the continuous operation time of the haptic pen by minimizing power usage.
Implementation Method 1
a resonant frequency period including a waveform of a sine wave vibrating at a resonant frequency of the haptic element
Data Source
AI summary
To provide a haptic pen and a haptic control waveform generation method that can suppress an increase in the power consumption necessary for operating a haptic element and that can realize an increase in the continuous operation time. A haptic pen includes a linear resonant actuator (LRA) motor that operates according to a reproduced waveform. The reproduced waveform includes a resonant frequency period including a waveform of a sine wave vibrating at a resonant frequency of the LRA motor and a period including a waveform vibrating at one or more frequencies different from the resonant frequency of the LRA motor.