Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by opto-electronic means {by interrupting or reflecting a light beam, e.g. optical touch-screen}
Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by opto-electronic means {by interrupting or reflecting a light beam, e.g. optical touch-screen}