| 摘要 |
Optical digitisers comprise a light emitting stylus reacting with a tablet with some means for determining the position of the stylus by locating the spot at which light from the stylus strikes the tablet. In this invention, the digitising tablet comprises a light sensitive region continuously extending over an area with respect to which the position of the stylus is determinable, the region being made of material having an electrical conductivity that varies in dependence on light incident upon it. Electrical measurement means are arranged to provide a signal indicative of the location of the spot of incident light in dependence on this variation. |
