Deutschetelekom Ag

Ulrich Koops

Hans Wilfried Koops

In an apparatus for the input of information, it is provided that a raster or an array of light-emitting screen elements is associated with a raster or an array of photodetectors, the light emitted by at least one of the screen elements being reflected to at least one of the photodetectors when an object approaches the apparatus; it is further provided that output signals of the photodetectors are used to obtain information on which of the photodetectors are receiving reflected light.

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Ramstadt, Germany

Ulrich Koops