Abstract: There is provided an input device capable of retrieving inputted information from data stored in a storage means in a short time. This input device includes: an optical waveguide including an under cladding layer, linear cores, and an over cladding layer; a light-emitting element connected to one end surface of the cores; a light-receiving element connected to the other end surface of the cores; and a storage means for storing therein information inputted to an input region. A specific region is defined in part of the input region. The input device further includes a management information recognition means for recognizing a management number inputted into the specific region as management information for management of a note inputted to part of the input region which lies outside the specific region. The management number and the note are stored in a pair in the storage means.

Abstract: There is provided a position sensor configured to prevent a light-receiving element from sensing extraneous light. The position sensor includes: an optical waveguide in a sheet form including an under cladding layer in a sheet form, a plurality of linear cores arranged in a lattice form and formed on a surface of the under cladding layer, and an over cladding layer in a sheet form formed to cover the cores; a light-emitting element connected to one end surface of the cores; and a light-receiving element connected to the other end surface of the cores. The entire outer surface of the optical waveguide and the entire outer surface of the light-receiving element are covered with a light shielding sheet for shielding against light of a wavelength recognizable by the light-receiving element.

Abstract: An information display device includes an information display element having a display, and an optical waveguide in a sheet form affixed to a surface of the display and constituting a position sensor. The optical waveguide is configured such that linear cores in a lattice form are held between an under cladding layer and an over cladding layer both in a sheet form. The cores have an elasticity modulus higher than that of the under cladding layer and that of the over cladding layer. Thus, the deformation rate of a cross section of the cores as seen in a pressed direction is lower than the deformation rates of cross sections of the over cladding layer and the under cladding layer when a surface of the optical waveguide is pressed with an input element such as a writing implement.

Abstract: Provided is an electronic underlay in which, even when a hand is laid on a writing trace or an uneven portion on a paper, the writing trace is not detected. The electronic underlay is placed beneath a paper, which is written upon using a writing tool, and includes: an optical waveguide in a sheet form configured such that linear cores arranged in a lattice form are held between an under cladding layer and an over cladding layer; a light-emitting element connected to one end surface of the linear cores; and a light-receiving element connected to the other end surface of the linear cores. The over cladding layer is covered with a sheet material made of a resin, and the sheet material has an elasticity modulus within a range of 1 MPa to 200 GPa and a thickness of 5 ?m to 200 ?m.

Abstract: Provided is an information management system, esigned not to sense a hand holding a writing tool at the time of writing on a sheet. The information management system is provided with a personal computer which has a display, and an electronic underlay which is laid under a sheet to perform writing. The electronic underlay is provided with: a sheet-like optical waveguide formed by sandwiching lattice-like cores between a sheet-like under cladding layer and a sheet-like over cladding layer; a light emitting element connected to one end surface of the cores; and a light receiving element connected to another end surface of the core. An elasticity modulus of the core is larger than an elasticity modulus of the under cladding layer and of the over cladding layer.

Abstract: A position sensor includes: a sheet-form optical waveguide including an under cladding layer, linear cores arranged in a lattice on the under cladding layer, and an over cladding layer formed to cover the cores; a light-emitting element connected to one end surface of the cores; and a light-receiving element connected to the other end surface of the cores. A refractive index difference between the cores and the under cladding layer and a refractive index difference between the cores and the over cladding layer are set in a specific range. The cores have an elasticity modulus higher than those of the under and over cladding layers. The deformation rate of a cross section of the cores as seen in a pressed direction is lower than the deformation rates of cross sections of the over cladding layer and the under cladding layer when a surface of the optical waveguide is pressed.

Abstract: 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.

Abstract: The information display system includes a PC having a display, and an input device which enables a user to input new information to be added to information appearing on the display with an input element such as a pen, thereby outputting the inputted information to the PC. This input device includes an optical waveguide in a sheet form configured such that linear cores arranged in a lattice form are held between an under cladding layer and an over cladding layer both in a sheet form. The cores have an elasticity modulus higher than that of the under cladding layer and that of the over cladding layer. Thus, the deformation rate of a cross section of the cores as seen in a pressed direction is lower than the deformation rates of cross sections of the over cladding layer and the under cladding layer when a surface of the optical waveguide is pressed.

Abstract: A position sensor includes: a sheet-form optical waveguide including a sheet-form under cladding layer, a plurality of linear cores arranged in a lattice form and formed on a surface of the under cladding layer, and a sheet-form over cladding layer covering the cores; a light-emitting element connected to one end surface of the cores; and a light-receiving element connected to the other end surface of the cores. The cores have an elasticity modulus higher than that of the under cladding layer and that of the over cladding layer. The deformation rate of a cross section of the cores as seen in a pressed direction is lower than the deformation rates of cross sections of the over cladding layer and the under cladding layer when a surface of the sheet-form optical waveguide is pressed.

Abstract: Provided is an electronic underlay with a wireless transmission function, designed not to sense a hand holding a writing tool at the time of writing on a sheet. The electronic underlay with a wireless transmission function can be laid under a sheet to perform writing with a writing tool. The electronic underlay is provided with: a sheet-like optical waveguide formed by sandwiching lattice-like cores between a sheet-like under cladding layer and a sheet-like over cladding layer; 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 wireless transmission means for wirelessly transmitting inputted letters as electronic data. An elasticity modulus of the core is larger than an elasticity modulus of the under cladding layer and the over cladding layer.

Abstract: Provided is an information management system, esigned not to sense a hand holding a writing tool at the time of writing on a sheet. The information management system is provided with a personal computer which has a display, and an electronic underlay which is laid under a sheet to perform writing. The electronic underlay is provided with: a sheet-like optical waveguide formed by sandwiching lattice-like cores between a sheet-like under cladding layer and a sheet-like over cladding layer; a light emitting element connected to one end surface of the cores; and a light receiving element connected to another end surface of the core. An elasticity modulus of the core is larger than an elasticity modulus of the under cladding layer and of the over cladding layer.

Abstract: Provided is an electronic underlay with a wireless transmission function, designed not to sense a hand holding a writing tool at the time of writing on a sheet. The electronic underlay with a wireless transmission function can be laid under a sheet to perform writing with a writing tool. The electronic underlay is provided with: a sheet-like optical waveguide formed by sandwiching lattice-like cores between a sheet-like under cladding layer and a sheet-like over cladding layer; 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 wireless transmission means for wirelessly transmitting inputted letters as electronic data. An elasticity modulus of the core is larger than an elasticity modulus of the under cladding layer and the over cladding layer.

Abstract: 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.

Abstract: Provided is an electronic underlay with a wireless transmission function, designed not to sense a hand holding a writing tool at the time of writing on a sheet. The electronic underlay with a wireless transmission function can be laid under a sheet to perform writing with a writing tool. The electronic underlay is provided with: a sheet-like optical waveguide formed by sandwiching lattice-like cores between a sheet-like under cladding layer and a sheet-like over cladding layer; 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 wireless transmission means for wirelessly transmitting inputted letters as electronic data. An elasticity modulus of the core is larger than an elasticity modulus of the under cladding layer and the over cladding layer.