Wirephoto receiver TM 4006 (1981)
The wirephoto receiver TM 4006 records black-and-white pictures with a helium-neon laser on dry photo paper (dry-silver-paper), modulating the intensity of the laser beam by the received electrical signal.
The laser beam is deflected by a galvanometer mirror and a light path deflecting mirror, such that the beam records the photo paper line by line. The mirror of the galvanometer is rotated according to a sawtooth function, rotating the mirror steadily and then jumping back quickly to the starting position. This sweeps the laser beam continuously along a recording line on the photo paper, and then moves it immediately to the start of the next line.
The photo paper is developed by heating after the recording.

  Kulturdenkmal SH en

  TM 4006 Strahlengang