ELECTRONIC MARKING INSTRUMENT

摘要

A hand-held marking device comprises an electrically actuated writing head (20) for making marks on a writing surface and a sensor (40) for detecting when the writing head is moving in any direction in a plane parallel to the surface. The device includes means (57) for causing the head to be actuated when the sensor detects relative movement of the writing head and the surface. The writing head can be arranged to be able to make a plurality of different types or sizes of marks on a writing surface, in which case means (53-55) are provided for selecting which of the different mark types or sizes is to be made.