Optical Waveguide Underlay for Hand-Pressure Discrimination
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Solution Overview
Problem
Existing electronic notebook systems that use light-shading to detect written notes often incorrectly register hand movements as written data due to the hand's root portion or fingers shading the light, leading to unnecessary data storage.
Innovation Solution
An electronic underlay with a sheet-like optical waveguide featuring linear cores in a lattice shape, where the core has a higher elasticity modulus than the cladding layers, allowing for differential light propagation based on writing pressure, enabling the detection of writing tool movements while ignoring hand pressure, by using the underlay beneath the writing surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If light-shading detection method is used to detect written notes, then writing input can be detected, but hand movements are incorrectly registered as written data
Solution Approach 1:
The patent applies local quality by creating different elasticity modulus zones within the optical waveguide structure. The core region has a higher elasticity modulus than the cladding layers, creating localized mechanical property differences that enable selective response to writing tool pressure versus hand pressure based on the local structural characteristics.
Solution Approach 2:
The patent utilizes parameter changes by exploiting the differential elasticity modulus values of different waveguide components. When pressure is applied, the core and cladding layers deform at different rates due to their distinct elasticity moduli, causing dynamic changes in light propagation characteristics that differentiate between writing tool contact and hand contact.
2Ease of operation
If the optical waveguide is placed on the sheet surface, then writing can be detected, but hand pressure is also detected as writing
Solution Approach 1:
The patent implements local quality through the differentiated elasticity modulus distribution within the optical waveguide structure. The core material is selected to have higher elasticity modulus than the cladding layers, creating localized mechanical response characteristics that enable the system to distinguish between concentrated writing tool pressure and distributed hand pressure.
Solution Approach 2:
The patent employs parameter changes by utilizing the differential deformation responses of the core and cladding layers under applied pressure. The varying elasticity moduli cause different stress-strain relationships and light propagation changes, allowing the detection system to differentiate between writing tool contact and hand contact based on the magnitude and pattern of optical parameter changes.
3Ease of manufacture
If uniform elasticity modulus is used throughout the optical waveguide, then manufacturing is simplified, but differential light propagation response to pressure cannot be achieved
Solution Approach 1:
The patent applies local quality by assigning different elasticity modulus values to different regions of the optical waveguide. The core is formulated with higher elasticity modulus materials while the cladding layers use lower elasticity modulus materials, creating localized mechanical property gradients that enable selective pressure response without requiring complex multi-component assembly.
Solution Approach 2:
The patent utilizes composite materials by combining materials with different elasticity moduli within the optical waveguide structure. The core and cladding layers are constructed from materials specifically selected for their contrasting mechanical properties, creating a composite structure that exhibits differential light propagation characteristics under pressure while maintaining manufacturing feasibility through established fabrication techniques.
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
Effectively differentiates between writing tool pressure and hand pressure, preventing unnecessary data capture and ensuring accurate detection and storage of written information as electronic data.
Implementation Method 1
a sheet-like optical waveguide in which a plurality of linear cores are arranged and formed in a lattice shape on the surface of a sheet-like under cladding layer
Implementation Method 2
An elasticity modulus of the core is larger than an elasticity modulus of the under cladding layer and an elasticity modulus of the over cladding layer, and in a state where the surface of the sheet is pressed by the tip of the writing tool, in a direction of the pressing, a deformation ratio of the core in a cross section is smaller than deformation ratios of the over cladding layer and the under cladding layer in cross sections
Data Source
AI summary
Provided is an electronic underlay designed not to sense a hand holding a writing tool at the time of writing notes on a sheet. The electronic underlay is provided with: a sheet-like optical waveguide formed by sandwiching lattice-like cores between a sheet-like under cladding and over cladding layers; a light emitting element connected to one end surface of the core; a light receiving element connected to another end surface of the core; and storage means for storing an inputted note as electronic data. An elasticity modulus of the core is larger than that of the under cladding layer and the over cladding layer. When the surface of the optical waveguide is pressed, in the pressing direction, a deformation ratio of the core in a cross section is smaller than that of the over cladding layer and the under cladding layer.