To make erasable information written on a prescribed paper sheet, and to recognize the erased information in information processing equipment such as a personal computer of a transmission destination for an electronic data.
This pen is provided with an eraser 80 for erasing the information written in the prescribed paper sheet by a pen part 10 for writing the information in the prescribed paper sheet, and a camera 30b for photographing a locus of the eraser 80 on the prescribed paper sheet. Erased trace information erased by the eraser 80 is calculated based on the locus photographed by the camera 30b in a control part 60, and holograph information by the pen part 10 and the erased trace information by the eraser 80 are recorded time-serially in a memory 40. The holograph information and the erased trace information stored in the memory 40 and read out by control of the control part 60 are transmitted in a mode capable of recognizing a time-serial condition, in a communication part 70.
Katsuhiro Ito
Ishibashi Masayuki
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