Vibration Control Method for Sharp Haptic Feedback
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Solution Overview
Problem
Existing electronic apparatuses with vibration feedback fail to provide a sharp and clear operation feeling due to a fixed vibration frequency that persists, influencing the Pacinian corpuscle and leading to a lingering stimulus, making operations less distinct.
Innovation Solution
An electronic apparatus with a vibration control method that adjusts vibration frequencies between two intervals, where the first interval has a vibration frequency equal to or lower than 250 Hz and the second interval has a frequency lower than the first, or vice versa, to provide distinct stimuli and prevent lingering vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed vibration frequency is used to stimulate the Pacinian corpuscle, then the vibration stimulus is strong and recognizable, but the stimulus lingers and the operation feeling becomes unclear
Solution Approach 1:
The vibration frequency is changed from a fixed value to a dynamically variable value. The control unit adjusts the vibration frequency based on the elapsed time since the touch operation, transitioning from a first frequency (effective for Pacinian corpuscle stimulation) to a second frequency (lower than the first) after a predetermined time period. This dynamic adjustment resolves the contradiction by maintaining strong initial stimulation while preventing lingering effects that would degrade operation clarity.
Solution Approach 2:
The vibration stimulus is applied in a periodic manner with two distinct phases: an initial phase with a first vibration frequency that effectively stimulates the Pacinian corpuscle, followed by a subsequent phase with a second vibration frequency that is lower and reduces the lingering stimulus. This periodic structure allows the system to deliver strong initial feedback while then transitioning to a state that provides clear operation feeling.
2Force
If the vibration frequency is always fixed at the Pacinian corpuscle recognition frequency, then the stimulus is maximized, but the vibration remains prolonged and loses sharpness
Solution Approach 1:
The vibration frequency transitions dynamically from a first frequency optimized for Pacinian corpuscle stimulation to a second frequency after a predetermined time. This dynamic frequency adjustment ensures that the vibration stimulus is maximized during the initial phase while automatically reducing the stimulus intensity in the subsequent phase, thereby preventing prolonged lingering vibration and maintaining operational sharpness.
Solution Approach 2:
The system prepares for the potential harm of lingering vibration by preemptively switching to a second, lower vibration frequency after a predetermined time period. This beforehand cushioning approach prevents the vibration from lingering too long by anticipating the degradation of operation feeling and counteracting it through frequency reduction.
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 allows for a sharp and clear sense of touch by varying vibration frequencies during the movement of the operating body, ensuring that the stimulus is not prolonged, thereby enhancing the operator's feedback experience.
Implementation Method 1
vibration generating means for reciprocatively vibrating the operating body
Implementation Method 2
an elastic member capable of being compressed when the transmission member is driven by the actuator in the first direction
Implementation Method 3
a stimulus is given to a finger using vibration acceleration capable of being recognized by a Pacinian corpuscle included in the finger
Data Source
AI summary
Disclosed is controlling a vibration of a vibration generating device configured to reciprocatively vibrate an operating body movably supported in a first direction and a second direction which are opposite to each other, a driving signal being transmitting to a first interval and a second interval in which vibration frequencies of acceleration during movement of the operating body are different from each other, the first interval being an initial motion interval when the operating body moves toward the first direction, the second interval being an initial motion interval when the operating body moves toward the second direction. The vibration frequency of the second interval is smaller than the vibration frequency of the first interval which is equal to or smaller than 250 Hz, and the vibration frequency of the second interval is greater than the vibration frequency of the first interval which is equal to or greater than 250 Hz.