ELECTRONIC UNDERLAY WITH WIRELESS TRANSMISSION FUNCTION

摘要

Provided is an electronic underlay with a wireless transmission function, designed not to sense an unnecessary portion such as a little finger, its root portion or the like of a hand holding a writing tool at the time of writing on a sheet with the writing tool, and is capable of writing on the sheet and simultaneously forming the written contents into electronic data to wirelessly transmit the electronic data. The electronic underlay A with a wireless transmission function can be laid under a sheet to perform writing on with a writing tool. The electronic underlay A is provided with: a sheet-like optical waveguide W formed by sandwiching lattice-like cores 2 between a sheet-like under cladding layer 1 and a sheet-like over cladding layer 3; a light emitting element 4 connected to one end surface of the core 2; a light receiving element 5 connected to another end surface of the core 2; and wireless transmission means for wirelessly transmitting inputted letters or the like as electronic data. An elasticity modulus of the core 2 is larger than an elasticity modulus of the under cladding layer 1 and an elasticity modulus of the over cladding layer 3.