Color Indicating Position Locater for a CRT
Original Publication Date: 1987-Jul-01
Included in the Prior Art Database: 2005-Feb-01
A passive probe is provided with a retroreflective material and a graduated light filter material to provide, to an operator of a data processing terminal system, a means to input data into the system, for example, to change the color of the CRT display associated with the system, to display numerical data, or to input other information. Fig. 1 illustrates a known system for detecting the X-Y position of a probe 1 relative to the face of a CRT 2. A light source 3, such as a light emitting diode (LED), produces a beam which is directed by a mirror 4 to a rotating polygon mirror 5 which has two sets of facets, one causing the beam to scan across a bar code picket fence 6 surrounding three sides of the CRT as illustrated by solid lines 7A, 7B.