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light pen

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Definition of light pen in English:

noun

1A handheld pen-like photosensitive device held to the display screen of a computer terminal for passing information to the computer.
Example sentences
  • You may have to adjust the brightness of your monitor to get your light pen to work properly.
  • Various other light pens have been developed which include a lens for focusing the axially received light.
  • The radiated light is directed so as to be projected from a tip of the light pen as required.
2A handheld light-emitting device used for reading barcodes.

Definition of light pen in:

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