| 摘要 |
The input device includes a frame-shaped optical waveguide having a hollow input-use interior, and a control means provided on the outside of one of the sides of the optical waveguide. The optical waveguide and the control means are provided on a surface of a frame-shaped retainer plate. The control means includes: a light-emitting element connected to ends of light-emitting cores of the optical waveguide; a light-receiving element connected to ends of light-receiving cores of the optical waveguide; and a CPU incorporating a program. Upon sensing a first light-shielded area where light is intercepted by the tip of a pen and a second light-shielded area where light is intercepted by user's hand that holds the pen, the program recognizes the second light-shielded area larger than the first light-shielded area as unnecessary information, based on a difference in light-shielded area.
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