| 摘要 |
<p>Disclosed is optical switching keyboard apparatus employing identically constructed aligned matrix panels forming the apparatus housing as well as defining collimated light beams focused upon a photodetector matrix disposed in an area on a circuit board which extends transverse to and through slotted apertures in the aligned panels. Coded electrical signals are provided by the translation of coded shutters into selected light interrupting relationship with the beams, the coded shutters effective to block selected apertures of the matrix panels, which apertures are tapered in the direction of the beam travel.</p> |
