INTERACTIVE INPUT SYSTEM AND PEN TOOL THEREFOR

摘要

A pen tool comprises an elongate body, a tip adjacent one end the body, and a filtered reflector disposed on the body, the filtered reflector comprising a reflecting portion and at least one filtering element, the at least one filtering element configured to permit illumination emitted at a selected wavelength to pass therethrough and impinge on the reflecting portion and to permit illumination at the selected wavelength that is reflected by the reflecting portion to exit the filtered reflector.