Tactile Sensation Element With Protrusions For Localized Vibration
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Solution Overview
Problem
Existing vibration type tactile sensation presenting elements struggle to accurately present tactile sensations in minute regions due to users sensing vibrations at distances further away than intended and over broader areas than the actual vibration source.
Innovation Solution
The proposed tactile sensation presenting element includes a vibrator layer with independently controllable unit regions, opposed electrode layers with non-overlapping protrusions, and a second substrate with specific thickness and Young's modulus relationships to enhance localized vibration delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a vibration type tactile sensation presenting element is used to present tactile sensations, then tactile sensations can be presented to the user, but the user senses vibration at portions far away more than the distance between the vibration generation portion and the contact portion, and in a broader area than the actual vibration generation portion
Solution Approach 1:
The presenting surface is divided into multiple independent presentation portions, each capable of generating vibration independently. This segmentation allows precise localization of tactile sensations to specific regions, preventing vibration spread to broader areas and enabling accurate tactile feedback for minute regions on the display screen.
Solution Approach 2:
Each presentation portion is designed with specific local characteristics including protrusions with controlled height and stiffness, and localized vibration generation capability. This local quality ensures that vibration is confined to the intended presentation portion and does not spread to adjacent areas, improving tactile sensation localization accuracy.
2Measurement precision
If protrusions are added to the presenting surface to improve tactile sensation localization, then vibration localization improves, but the device structure becomes more complex
Solution Approach 1:
The protrusions and vibration generation portions are merged into an integrated structure where the protrusions are formed as part of the presentation portion itself. This combining of structures reduces overall device complexity while maintaining the vibration localization benefit, as the protrusions serve both structural and tactile feedback functions simultaneously.
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 configuration allows for accurate and high-resolution presentation of tactile sensations in minute regions, ensuring that vibrations are felt precisely at the intended location without spreading to broader areas.
Implementation Method 1
the vibrator layer is a piezoelectric layer that is made of a piezoelectric material
Data Source
AI summary
A tactile sensation presenting element includes: a vibrator layer; and a first electrode layer and a second electrode layer located so as to oppose each other with the vibrator layer interposed therebetween. At least one of the first electrode layer and the second electrode layer includes a plurality of electrodes that are electrically independent of one another. The vibrator layer includes a plurality of unit regions, in each of which occurrence of vibration can be independently controlled. The tactile sensation presenting element further includes a plurality of protrusions located opposite to the vibrator layer relative to the first electrode layer.