PARTIAL ERASING SYSTEM OF HANDWRITTEN INFORMATION

摘要

PURPOSE:To decide the erasion information through a simple process, by having a circular range of erasion with a partial erasing system of handwritten information. CONSTITUTION:An eraser 5 is shifted on a white plate 2 to erase the handwritten information on the plate 2. Then a magnetic field detecting coil provided at a holding part 5-2 detects a magnetic field. This magnetic field is fed to a coordinate detecting part 6 in the form of an erasion signal S2. The part 6 calculates the coordintes E1 of the part 5-2 and transmits it to a circular erasion infomation generting part 9. The part 9 generates the erasion information E to erase the picture information within a circle of the same size as an erasion part 5-1 around the coordinates E1 and updating the picture information P that is already stored at a prescribed position of a picture memory 7. As a result, a range equal to that on the plate 2 can be erased even with the pictures displayed on a display device 8.