Tactile Sensation Apparatus Pressure Threshold Control
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Solution Overview
Problem
Touch sensors lack physical feedback, leading to potential erroneous inputs due to lack of tactile sensation, especially in noisy environments or when the input object is small, and existing vibration-based feedback can trigger unintended operations with low threshold sensitivity.
Innovation Solution
A tactile sensation providing apparatus that detects pressure loads on a touch sensor and vibrates when a predetermined standard is reached, adjusting the standard load and time for each user to ensure timely tactile feedback, thereby preventing erroneous inputs and enhancing the operation feeling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the touch sensor has a low threshold to receive input, then the input sensitivity is improved, but erroneous operations are triggered by unintentional touches
Solution Approach 1:
The system performs preliminary detection of touch position and pressure magnitude before triggering input. By evaluating whether the pressure meets a predetermined threshold at the detected position, the system prepares and validates the input condition in advance, preventing erroneous operations from unintentional touches while maintaining sensitivity for intentional inputs
Solution Approach 2:
The system changes the parameter for input recognition from solely position-based to a combination of position and pressure magnitude. By introducing pressure magnitude as an additional parameter with a predetermined threshold, the system distinguishes between intentional presses and unintentional touches, resolving the contradiction between sensitivity and error prevention
2Speed
If tactile sensation is provided immediately upon touch, then the feedback responsiveness is improved, but the operation feeling is impaired when light pressure is applied
Solution Approach 1:
The system changes the parameter for triggering tactile feedback from immediate touch detection to pressure magnitude evaluation. By requiring the pressure magnitude to reach a predetermined threshold before providing tactile sensation, the system ensures that feedback is provided at appropriate timing for intentional presses while avoiding premature feedback for light or unintentional touches
Solution Approach 2:
The system implements a feedback mechanism where tactile sensation is provided based on evaluated input conditions rather than immediate touch. The feedback timing is controlled by whether the pressure magnitude meets the predetermined threshold, creating a responsive yet controlled feedback system that maintains proper operation feeling
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 apparatus provides reliable tactile feedback at the appropriate time, maintaining the operation feeling even with light pressure loads, reducing the likelihood of erroneous inputs and providing a sensation similar to pressing a physical button switch.
Implementation Method 1
A piezoelectric element, which serves as a load detection unit, is attached to the rear face of the touch sensor
Implementation Method 2
the tactile sensation providing unit which vibrates the touch face... A piezoelectric element, which serves as a load detection unit, is attached to the rear face of the touch sensor and serves as a tactile sensation providing unit
Data Source
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AI summary
A tactile sensation providing apparatus capable or providing a tactile sensation to a user at timing maintaining an operation feeling of the user, even when a light pressure load is applied, is provided. According to the present invention, the tactile sensation providing apparatus includes a touch sensor 11 configured to detect a touch input, a load detection unit 12 configured to detect a pressure load on a touch face of the touch sensor 11, a tactile sensation providing unit 13 configured to vibrate the touch face, and a control unit 16 configured to adjust a standard for providing a tactile sensation and, when the pressure load detected by the load detection unit 12 satisfies the standard, to control drive of the tactile sensation providing unit such that the tactile sensation is provided to an object pressing the touch face.