Vibration Generator Drive Circuit Using Timed Positive One-Shot Pulses
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Solution Overview
Problem
Conventional vibration generators require complex drive circuits to generate a sine wave drive signal, leading to increased costs due to the need for negative potentials and voltage boosters, and may result in weakened vibrations if cost reduction measures are implemented.
Innovation Solution
A one-shot drive signal is used that rises on the positive side, eliminating the need for negative potentials and biasing, and a second one-shot signal is applied at the peak movement timing to enhance vibration strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a sine wave drive signal is used to generate vibration, then the vibration generation function is achieved, but the circuit configuration becomes complicated and cost increases due to the need for negative potentials and voltage boosters
Solution Approach 1:
The patent extracts only the necessary positive voltage component from the traditional sine wave drive signal, eliminating the need for negative potential generation circuits. By using a unipolar drive signal that activates the actuator only during the positive half-cycle, the circuit complexity is reduced while maintaining vibration generation capability.
Solution Approach 2:
Instead of generating a traditional bipolar sine wave that requires both positive and negative potentials, the patent inverts the approach by using a unipolar drive signal. This inversion simplifies the circuit architecture by removing the need for complex voltage generation and switching circuits required for bipolar signals.
2Device complexity
If cost reduction measures are implemented by simplifying the drive circuit, then the circuit complexity and cost are reduced, but the vibration strength becomes inappropriately weakened
Solution Approach 1:
The patent employs periodic drive signals with optimized timing and frequency to maintain strong vibration output despite circuit simplification. By controlling the actuator with periodic unipolar signals that synchronize with the mechanical resonance of the vibration element, the system achieves strong vibration without requiring complex high-voltage circuits.
Solution Approach 2:
The patent optimizes parameters such as drive signal frequency, duty cycle, and amplitude to compensate for the simplified circuit architecture. By adjusting these parameters to match the resonant characteristics of the actuator and vibration element, strong vibration output is achieved without the need for complex voltage boosting circuits.
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 reduces costs while preventing inappropriate weakening of vibrations, ensuring strong and effective vibration generation.
Implementation Method 1
a vibration generator that vibrates a touch panel by outputting a drive signal to an actuator
Data Source
AI summary
A drive signal output section of a vibration generator outputs a one-shot drive signal, as a first drive signal, that rises on a positive side when a vibrator is vibrated, that has a voltage changing on the positive side, and that applies force to move the vibrator or a vibration target vibrated in conjunction with the vibration of the vibrator in a first direction, and thereafter, outputs a one-shot drive signal, as a second drive signal, such that a timing when a movement of the vibrator or the vibration target peaks in a second direction that is opposite to the first direction coincides with a timing of start of rise of the signal, so as to increase amplitude of the vibration of the vibrator or the vibration target by the one-shot signal that is not displaced on a negative side.