Patent ID: 6812845
Filing Date: 2004-11-02
Classification: G08B

Abstract:
A body-mounted electronic device system comprising:a master unit mounted on the bodies having first communication means for executing radio communication with a plurality of child units, first identification data storage means for storing identification data of the plurality of child units, identification data judging means for judging whether the identification data received from the plurality of child units are in agreement with the identification data of child units stored in the first identification data storage means, distance calculation means for calculating distances among the plurality of child units from moving quantity data received from the plurality of child units, and notifying means for notifying the distances among the child units; and the plurality of child units mounted on the bodies having second communication means for executing radio communication with the master unit, moving quantity-measuring means for measuring the moving quantity corresponding to its own moving distance, and second identification data storage means for storing its own identification data, wherein each of the plurality of child units transmits its own moving quantity data measured by the moving quantity-measuring means together with its own identification data to the master unit through the second communication means, and when the identification data judging means has judged that the identification data received from the plurality of child units are in agreement with the identification data stored in the first identification data storage means, the master unit causes the distance calculation means to calculate the distances among the child units based upon the moving quantity data from the plurality of child units received through the first communication means, and notifies the distances among the child units through the notifying means.