The light pen for scanning screens during the transmission of signals is provided with a tubular housing into which a photoelectric component and an electrical switch are incorporated. The front end is formed by a light pen tip containing a central light shaft 3 for passage of the light beam to the photoelectric component and an actuation tube 4 for the switch 10, 11, which actuation tube can be displaced axially in the housing and projects from the latter. In order to simplify the construction and in order to ensure better functioning, the light shaft 3 is provided in a tubular extension 2 fixedly connected to the housing and the actuation tube 4 for the electrical switch 10, 11 is led in a displaceable manner on the extension 2, which switch is arranged on a carrier 1 connected to the tubular extension 2. IMAGE
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