Patent ID: RE40880

Claim:
A data input device optically interfacing with an operator to detect the position of one or more objects within an input zone to allow the operator to enter character data into associated electronic equipment, wherein each position of the objects within the input zone corresponds to a unique selection of data to be entered into the electronic equipment, the input device comprising: a source of optical sensor light illuminating the input zone with sensor light, the sensor light reflecting off the objects in a direction generally toward the input device; an optical detector arranged to receive the reflected sensor light as a reflected light pattern representing the position of the objects within the input zone, the optical detector converting the reflected right pattern to an electrical signal; a light generator positioned to emit visible light and a deflective optical element that projects an optical image of an input device having discrete sub-images at unique positions within the optical image that represent different character data that may be selected for input into the electronic equipment; wherein the deflective optical element comprises a stencil designed to allow light to pass through portions of the stencil and wherein the light generator is positioned to emit visible fight through the portions of the stencil such that the light passed through the stencil forms the optical image; and a microprocessor that receives the electrical signal from the optical detector and correlates the electrical signal to the unique selection of data.