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Communication link

  • US 4,423,319 A
  • Filed: 01/13/1981
  • Issued: 12/27/1983
  • Est. Priority Date: 01/17/1980
  • Status: Expired due to Fees
First Claim
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1. A communication link for transferring information from a data terminal (10), with connected light pen (3) with a point end (7) which includes a light diode (4) and phototransistor (5) or corresponding means, to a greater computer unit, wherein the communication link (1) includes a light pen holder (2) and an information transferring device, which comprises a transfer phototransistor (11) or the like, and an amplifier (13) to which said phototransistor is connected and said amplifier (13) being adapted to be connected to a greater computer unit or memory unit, said transfer phototransistor (11) being located adjacent said holder (2) whereby said transfer phototransistor (11), when a light pen (3) is inserted in said holder (2), is located close to the point end (7) of the light pen (3), and that the data terminal (10) and light pen (3) in a manner known per se emit light pulses, corresponding to information stored in the data terminal (10), by the light diode (4) of the light pen, which pulses are intended to activate said transfer phototransistor (11) for transferring the pulses via said amplifier further to the greater computer unit by electric signals, said communication link being further characterized in that said information transferring device also includes a transfer light diode (16) located adjacent said transfer phototransistor (11), and a second amplifier (17) to which said transfer light diode (16) is connected and said second amplifier (17) being adapted to be connected to a greater computer unit, said transfer light diode (16) emits light pulses corresponding to instructions to the data terminal (10) arriving from the greater computer unit via said amplifier (17), and that the phototransistor (5) of the light pen (3) when the light pen is in said holder (2) is arranged to receive light pulses from said transfer light diode (16) and to transfer such pulses to the data terminal (10) via electric signals, where the data terminal (10) is arranged to receive such instructions.

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