Light-Sensitive Pen to Substitute for Finger in Laser Scanned Touch Screen
Original Publication Date: 1989-Aug-01
Included in the Prior Art Database: 2005-Jan-28
Disclosed is a device to enable a user's opaque finger or reflective stylus to be used indifferently in a laser-scanned touch screen, achieving the particular benefits of either. Laser-scanned touch- screen systems exist in the art in which a finger or an opaque stylus can be used to provide single-pixel accuracy, 100 points per second or more, over a display or input region of any size. While convenient and inexpensive, finger or opaque stylus (pencil, pen, toothpick, or other handy device) must not be accompanied by any other obstruction of light in the entire input area, which would be recognized by the system and all input rejected.