ELECTRONIC UNDERLAY

摘要

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.

主权项

1. An electronic underlay comprising:
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, an over cladding layer is formed in a sheet shape covering the plurality of linear cores, and the surface of the over cladding layer is a contact surface for a sheet; a light emitting element connected to first end surface of the plurality of linear cores; a light receiving element connected to second end surface of the plurality of linear cores; movement locus specifying means for specifying a movement locus of a tip of a writing tool on a surface of the sheet based on a light propagation amount of the plurality of linear cores which has been changed due to the movement; and storage means for storing the specified movement locus as electronic data, wherein an elasticity modulus of the plurality of linear cores is larger than an elasticity modulus of the under cladding layer and an elasticity modulus of the over cladding layer, wherein, 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 plurality of linear cores in a cross section is smaller than deformation ratios of the over cladding layer and the under cladding layer in cross sections, and wherein the electronic underlay is capable of being laid under the sheet to perform writing with the writing tool.