초록 ▼

A system and apparatus utilizes a source of coherent light located at the focal point of reflecting surfaces oriented to develop parallel beams of light extending over a given area with adjacent sides made to include arrays of light detectors scanned sequentially in a direction away from the source

A system and apparatus utilizes a source of coherent light located at the focal point of reflecting surfaces oriented to develop parallel beams of light extending over a given area with adjacent sides made to include arrays of light detectors scanned sequentially in a direction away from the source of light so as to detect the shadow cast by an object relative to the reflected light. Alternatively, a photodetector is positioned at the focal point of the reflectors to receive light emitted by individual ones of emitters. Reflecting surfaces are contemplated which simulate a parabolic shape.

대표청구항 ▼

In a system for locating the coordinates of an object such as a stylus or the like within an area, a frame surrounding and defining said area, said frame including pairs of sides spaced apart with each side of a pair parallel to the other side of said pair to form X and Y sides of said frame, an arr

In a system for locating the coordinates of an object such as a stylus or the like within an area, a frame surrounding and defining said area, said frame including pairs of sides spaced apart with each side of a pair parallel to the other side of said pair to form X and Y sides of said frame, an array of individual reflectors extending in a line along the edge of said area and attached to one side of each said pair of said sides with each said reflector having a reflecting surface oriented to direct light striking said surface in a beam perpendicular to the side of the said frame to which said reflector is attached, a source of coherent light including lens means positioned on a side of said frame opposite to said reflectors and adapted to broadcast light simultaneously to each said reflector on said side opposite from said source of light, an array of light detectors extending in a line along the frame side adjacent to said source of light, means operable to cause said detectors to be sequentially enabled to effect a scan of said area beginning with a said detector closest to the said source of light and extending away from said source of light, and further means operable to stop said scan upon the detection of a shadow as an indication of the location of an object within said area for each said X and Y side of said frame.