Programmable Hand Rest Option for Laser-Scanned Touch Entry Display
Original Publication Date: 1987-May-01
Included in the Prior Art Database: 2005-Feb-01
A known touch entry display 1 and its associated processor controls are modified to provide (1) normal mode of operation to sense the position of an operator's finger or other passive input probe relative to its CRT face 2, or alternatively, (2) a mode of operation permitting the operator to rest his hand, arm and ruler on 2 without interfering with a probe input, i.e., a "hand rest" mode. The known display is characterized by laser beam sources 3 and 4, rotating polygons 5 and 6 with scanning mirrors, photodiodes 7 and 8 and a strip of retro-reflective material 9 to reflect the scanning laser beams to 7 and 8 via light collecting lens 10 and 11. As 5 and 6 rotate, each mirror causes its respective beam to scan across 2 as illustrated at 12A, B, C and 13A, B, C.