Touch screen having reduced sensitivity to spurious selections.

摘要

A touch screen assembly including a molded cover and base is described. A mounting board is sandwiched between the cover and the base and supports a plurality of LEDs and detectors. Cylindrical guides corresponding to each of the LEDs and detectors are formed in the base when the base and cover are attached. The guides at the LEDs limit beam spreading and guides at the detectors prevent off-axis light from being detected. Support pedestals formed in the base, together with the cylindrical guides help align and support the LEDs and detectors to prevent misalignment and problems associated with fatigue. The cover is attached to the base by catch hooks which may be reached without disassembly of the CRT. Access to the mounting board is thereby facilitated. <IMAGE>