Tactile Top Panel Surface Roughness for Wider Friction Modulation
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Solution Overview
Problem
Existing tactile sense presentation devices have limited ranges of frictional force changes, leading to insufficient expressiveness of tactile sense.
Innovation Solution
A top panel for tactile sense presentation devices featuring ruggedness with specific cutoff values and surface roughness parameters, including first and second ruggedness, to enhance frictional force variation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If ultrasonic waves are applied to the top panel, then the tactile sense expressiveness is increased, but the frictional force change range is limited
Solution Approach 1:
The patent applies parameter changes by precisely controlling the surface roughness parameters (Ra between 2 nm and 100 nm, Rz between 10 nm and 500 nm) of the top panel to achieve a wide range of frictional force changes. By optimizing these surface parameters, the device can provide diverse tactile sensations while maintaining sufficient frictional force variation for effective user interaction.
2Adaptability or versatility
If the surface roughness is increased to enhance frictional force variation, then tactile expressiveness improves, but the device complexity increases
Solution Approach 1:
The patent resolves the contradiction by changing surface parameters through controlled roughness treatment rather than complex structural modifications. By adjusting Ra and Rz parameters within specific ranges, the invention achieves enhanced frictional force variation through a relatively simple surface processing approach, avoiding the need for complex multi-layer structures or additional mechanical components.
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 solution significantly widens the range of frictional force changes, thereby enhancing the expressiveness of tactile sense.
Implementation Method 1
an outer principal surface located on an exterior side of the tactile sense presentation device, and includes ruggedness provided on at least a portion of the outer principal surface... a three-dimensional arithmetical mean height Sa of the ruggedness is 0.5 nm to 100 nm and a maximum height Sz of the ruggedness is 8 nm or more
Implementation Method 2
The tactile sense presentation device changes the tactile sense by applying ultrasonic waves to the top panel
Data Source
AI summary
Provided is a top panel for a tactile sense presentation device in which the top panel can have a sufficiently wide range of changes in frictional force and thus effectively increase the expressiveness of the tactile sense. A top panel 1 for a tactile sense presentation device is for use in a tactile sense presentation device 10, has an outer principal surface 1a located on an exterior side of the tactile sense presentation device 10, and includes ruggedness provided on at least a portion of the outer principal surface 1a, wherein the ruggedness includes: first ruggedness in which where a cutoff value of a high-pass filter λc1 is five times a spacing between ruggedness in a measured total profile of the outer principal surface 1a and a cutoff value of a low-pass filter λs1 is 26.6 μm, a maximum height of the ruggedness is 0.5 nm to 2000 nm and a spacing between the ruggedness is 50 μm to 2000 μm; and second ruggedness in which where a cutoff value of a high-pass filter λc2 is 14 μm and a cutoff value of a low-pass filter λs2 is 0.35 μm, a three-dimensional arithmetical mean height Sa of the ruggedness is 0.5 nm to 100 nm and a maximum height Sz of the ruggedness is 8 nm or more.