Ricoh Synchrofax

Ricoh Synchrofax is a Japanese dictating machine from 1959, reissued in 1974 as the 3M Sound Page (model 627AA and 627AG) as official teaching material in the US-state of Oklahoma.[1] It is also known as sound paper. Inventor Sakae Fujimoto filed the patents US3074724A and US3046357A in 1959.[2][3]

Technology

The device produced by Ricoh uses bottom side magnetic coated paper, positioned by three perforations on three pins on device. A tape head on a rotating disc is spirally moved from outside to inside. Up to four minutes can be recorded per sheet. Microphone, headphones and monitor jacks are 3.5s plugs.[4]

The device is 12.555 lb or 5.7 kg, has 11 transistors and dimensions of 10.6×5.5×14.8 inch, which equal 270×140×375 mm.[5]

In 1973, the 3M device for schools cost US$299,[1] which would be $1648 today.

References

  1. 1 2 For teachers – pictures that talk, Popular Science, Ausgabe Mai 1973, S. 94
  2. ↑ . Sakae Fujimoto, Nihon Denki Bunka Kogyo Kabush, Riken Kogaku Kogyo Kabushiki K. "Patent US3074724 - Apparatus for positioning recording and recorded sheets on a magnetic recorder and reproducer". Google Books. 1960-09-14.
  3. ↑ . Sakae Fujimoto, Nihon Denki Bunka Kogyo Kabush, Riken Kogaku Kogyo Kabushiki K. "Patent US3046357 - Magnetic recording and reproducing machine". Google Books. 1960-09-07.
  4. ↑ Techmoan: RetroTech: Recordable Paper - The 3M Sound Page, YouTube, 12 April 2018
  5. ↑ Synchrofax R.P at the Radio Museum, retrieved 22 April 2018
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