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Related Concept Videos

Design Example: Resistive Touchscreen01:14

Design Example: Resistive Touchscreen

597
A device engineer plays a crucial role in designing user interfaces for mobile devices. One such interface is the resistive touchscreen, which fundamentally consists of two metallic layers: a flexible upper layer and a rigid lower layer, separated by a narrow gap. The high resistance between these two layers is a key characteristic of this design.
When a user touches the screen, the two layers make contact at a specific point known as the touchpoint. This contact reduces the resistance between...
597

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Measurement of Spatial Stability in Precision Grip
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A Novel Grip Force Measurement Concept for Tactile Stimulation Mechanisms - Design, Validation, and User Study.

Guy Bitton, Ilana Nisky, David Zarrouk

    IEEE Transactions on Haptics
    |November 12, 2020
    PubMed
    Summary

    This study introduces a novel grip force measurement concept using a single sensor, reducing tactile artifact errors. User studies show grip force adjustments in response to tactile movement, especially at lower target forces.

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    Area of Science:

    • Robotics
    • Human-Computer Interaction
    • Biomedical Engineering

    Background:

    • Accurate grip force measurement is crucial for robotic manipulation and prosthetics.
    • Existing methods can be affected by artifacts from tactile feedback mechanisms.
    • Developing integrated tactile stimulation and force sensing is an ongoing challenge.

    Purpose of the Study:

    • To develop and validate a new grip force measurement concept with embedded tactile stimulation.
    • To quantify the impact of tactor movement on grip force measurements.
    • To investigate human grip force control in response to tactile stimuli.

    Main Methods:

    • A novel device was designed using a single force sensor per gripper side for grip force measurement.
    • The device was calibrated and validated against a secondary force sensor (0-20 N range).
    • Tactor movement artifacts and dynamic grip force errors were quantified; user studies were conducted.

    Main Results:

    • Tactor movement introduced minimal artifacts (1% of measured force).
    • Average errors during dynamic grip force application were 2.9% (left) and 3.7% (right).
    • User studies revealed increased grip force with tactile movement, particularly for lower target forces.

    Conclusions:

    • The developed concept effectively measures grip force while integrating tactile stimulation.
    • The system demonstrates low measurement artifacts and acceptable error margins during dynamic tasks.
    • Human participants modulate grip force based on tactile feedback, influenced by target force and stimulation intensity.