Keyboard With Optically Changeable Key Symbols
Original Publication Date: 1984-Feb-01
Included in the Prior Art Database: 2005-Feb-02
A keyboard for a computer terminal, typewriter or other keyed manual data input device is constructed with keys having translucent tops through which the user can see images of character symbols that are optically transmitted to the keys from a CRT screen. This enables the same keyboard to be used for processing texts in different languages or symbol systems. As shown in the figure, character symbols are projected upon the screen of a small CRT (1 inch x 1 inch, for example) from which they are transmitted through optical fibers to the keyboard keys that are to be used for generating such characters. Each symbol is transmitted by a bundle of optical fibers associated with a 7 x 9 matrix of points for each key. This requires 63 x N fibers for each key, N being the number of fibers needed to define a single point in the matrix.