Voice Coil Vibration Control for Low-Frequency Body Stimulation
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Solution Overview
Problem
Current vibration devices lack the capability to effectively apply low-frequency vibrations, which are necessary for achieving relaxation and concentration effects similar to those produced by sound in music therapy, due to the absence of vibrating bodies with low resonance frequencies.
Innovation Solution
A vibration device comprising a voice coil type actuator and a control unit that outputs a composite wave signal, generated by combining sine waves of different frequencies, to produce vibrations in a specific low-frequency range, allowing for comfortable vibration applications parallel or perpendicular to the human body surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a vibrating body with low resonance frequency is used, then low-frequency vibration can be applied to achieve relaxation and concentration effects, but such vibrating bodies do not physically exist making it impossible to implement
Solution Approach 1:
The patent segments the vibration generation into two independent components: a high-frequency vibrating body (voice coil actuator operating at resonance) and a low-frequency control signal (composite wave). The vibrating body maintains its high-frequency resonance while the control signal modulates it to produce low-frequency vibration effects, thus solving the contradiction by separating the physical vibrating element from the desired low-frequency output.
Solution Approach 2:
The patent applies periodic modulation by using a composite wave signal consisting of multiple sine waves with specific frequency differences. This periodic control signal modulates the high-frequency vibration to create low-frequency vibration patterns that produce the desired relaxation and concentration effects, enabling low-frequency vibration without requiring a low-resonance vibrating body.
2Speed
If conventional actuators (electromagnetic solenoid or piezoelectric body) are used, then vibration can be generated, but they cannot produce low-frequency vibration required for relaxation and concentration effects
Solution Approach 1:
The patent employs a voice coil actuator that can dynamically respond to varying control signals. By using a composite wave control signal with multiple frequency components, the actuator dynamically adjusts its vibration characteristics to produce the desired low-frequency effects while maintaining operational flexibility and adaptability across different frequency ranges.
Solution Approach 2:
The patent changes the control parameter from direct low-frequency drive to high-frequency drive with low-frequency modulation. By altering the frequency parameters of the control signal (using composite waves with specific frequency differences), the system achieves low-frequency vibration effects while the actuator operates at its optimal high-frequency resonance, thereby expanding the effective frequency range capability.
3Use of energy by moving object
If high-frequency vibration is applied, then the vibrating body can operate efficiently at resonance, but it cannot produce the low-frequency vibration needed for relaxation and concentration effects
Solution Approach 1:
The patent uses periodic modulation with a composite wave control signal that contains multiple sine waves. This periodic action modulates the high-frequency resonance vibration to create low-frequency vibration patterns, allowing the actuator to operate efficiently at high frequency while producing the desired low-frequency effects through signal processing rather than direct mechanical vibration.
Solution Approach 2:
The control signal acts as an intermediary that translates high-frequency actuator operation into low-frequency vibration effects. The composite wave signal serves as a mediator between the high-frequency mechanical vibration capability of the actuator and the low-frequency relaxation effects desired, enabling energy-efficient operation at resonance while achieving the target low-frequency outcome.
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 provides comfortable vibration to the human body by efficiently generating low-frequency vibrations, improving energy efficiency and stimulating various sensory receptors, thereby achieving relaxation and concentration effects.
Implementation Method 1
a voice coil type actuator which includes a movable element to be vibrated; a yoke surrounding the movable element; and a coil surrounding the movable element and the yoke
Implementation Method 2
the control signal being a composite wave obtained by combining a plurality of sine waves having different frequencies, and a difference between frequencies of the plurality of sine waves being a specific frequency
Data Source
AI summary
A vibration device includes a voice coil type actuator that applies vibration to a human body, and a control unit that outputs a control signal, which is a composite wave obtained by combining plural sine waves having different frequencies so as to vibrate the voice coil type actuator in a vibration direction and in which a difference between frequencies of the plural sine waves is a specific frequency, to the voice coil type actuator.