Optical input cursor device using optical grid means

Claim 1

An optical cursor control comprising: a reflection plane with parallel lines of constant width and pitch on its surface in horizontal and perpendicular directions of a definite ratio to reflect light; a light source, lens, reflector and receiver to transmit light in the form of an image to the said reflection plane and reflect light therefrom, amplify it and transmit it, said receiver adapted to receive the image from said reflector, said receiver having a plurality of mutually spaced optical grids disposed in horizontal and perpendicular directions, each of the optical grids having a wafer in the bottom thereof to give corresponding High and Low output signals upon receipt of bright light and shadow the image covering all grids and defining 3/2 of the pitch in the horizontal and perpendicular directions the optical grids on said receiver in a horizontal direction adapted to provide an electronic signal in response to change of light from horizontal displacement of the light source, and the optical grids on said receiver in a perpendicular direction adapted to provide an electronic signal in response to change of light from perpendicular displacement of the light source on the reflection plane; and electronic signal processing means for receiving signals from said grids and amplifying, rectifying and computing to determine distance and direction of displacement and for controlling movement of a cursor responsive thereto.