Patent ID: 8716614

Claim:
A touch pad having a touch surface, the touch pad comprising: a radiation transmissive element having the touch surface and a second, opposite surface, the radiation transmissive element being defined by linear edge portions; at least two scanning arrangements, each being adapted to: provide a beam of radiation along a pertaining direction inside the radiation transmissive element, receive radiation from the radiation transmissive element and from the pertaining direction, and output a corresponding signal, and scan the pertaining direction at least substantially along at least part of the touch surface, the pertaining direction of the beam being substantially invariant and essentially parallel to one of the linear edge portions while being scanned along the touch surface; a processing element adapted to, on the basis of the signals from the scanning arrangements, determine a position on the touch surface where scattering/absorption of the radiation occurs; and wherein at least one of the at least two scanning arrangements includes a rotating mirror arranged to scan the pertaining direction of the beam along the touch surface.